Skip to main content
Download PDF

Significance of body temperature in elderly patients with sepsis

Critical Care volume 24, Article number: 387 (2020) Cite this article

A Letter to this article was published on 13 October 2020

Abstract

Background

Elderly patients have a blunted host response, which may influence vital signs and clinical outcomes of sepsis. This study was aimed to investigate whether the associations between the vital signs and mortality are different in elderly and non-elderly patients with sepsis.

Methods

This was a retrospective observational study. A Japanese multicenter sepsis cohort (FORECAST, n = 1148) was used for the discovery analyses. Significant discovery results were tested for replication using two validation cohorts of sepsis (JAAMSR, Japan, n = 624; SPH, Canada, n = 1004). Patients were categorized into elderly and non-elderly groups (age ≥ 75 or < 75 years). We tested for association between vital signs (body temperature [BT], heart rate, mean arterial pressure, systolic blood pressure, and respiratory rate) and 90-day in-hospital mortality (primary outcome).

Results

In the discovery cohort, non-elderly patients with BT < 36.0 °C had significantly increased 90-day mortality (P = 0.025, adjusted hazard ratio 1.70, 95% CI 1.07–2.71). In the validation cohorts, non-elderly patients with BT < 36.0 °C had significantly increased mortality (JAAMSR, P = 0.0024, adjusted hazard ratio 2.05, 95% CI 1.29–3.26; SPH, P = 0.029, adjusted hazard ratio 1.36, 95% CI 1.03–1.80). These differences were not observed in elderly patients in the three cohorts. Associations between the other four vital signs and mortality were not different in elderly and non-elderly patients. The interaction of age and hypothermia/fever was significant (P < 0.05).

Conclusions

In septic patients, we found mortality in non-elderly sepsis patients was increased with hypothermia and decreased with fever. However, mortality in elderly patients was not associated with BT. These results illuminate the difference in the inflammatory response of the elderly compared to non-elderly sepsis patients.

Background

A dysregulated host response to infection is a cornerstone of the pathophysiology of sepsis [1, 2]. A dysregulated response alters vital signs such as body temperature (BT), heart rate (HR), blood pressure (BP), and respiratory rate (RR) [3, 4]. Alterations such as hypothermia, fever, tachycardia, hypotension, or tachypnea tend to be associated with altered clinical outcomes [5,6,7,8,9].

Elderly patients generally have a blunted host inflammatory response [10,11,12], which could contribute to different associations between the vital signs and mortality between non-elderly and elderly patients, as observed in a variety of pathological settings [13,14,15]. In sepsis, a single-center study with a limited sample size demonstrated that BT, as a component of the vital signs, is an independent predictor of mortality only in elderly patients [13]. However, whether the relationships between altered vital signs and clinical outcomes differ between elderly and non-elderly patients remains unclear. Investigating and clarifying these differences might contribute to improving the quality of sepsis care, thus reducing mortality rates in critically ill septic patients.

Thus, we hypothesized that associations between initial vital signs and mortality are different for elderly and non-elderly patients with sepsis. Three large sepsis cohorts were investigated to assess the primary outcome of 90-day in-hospital mortality.

Materials and methods

Study cohorts

The current observational study was retrospectively conducted using three sepsis cohorts. Written informed consent was waived because of the study design.

Discovery cohort: FORECAST cohort

FORECAST (Focused Outcomes Research in Emergency Care in Acute Respiratory Distress Syndrome, Sepsis, and Trauma) was a multicenter (ICUs, n = 59, Japan), prospective observational study conducted by the Japanese Association for Acute Medicine (JAAM) from January 2016 to March 2017 [16]. Of the 1184 patients with sepsis, 1148 patients who had records of 90-day in-hospital mortality were included in the analyses. The Institutional Review Board of Chiba University Graduate School of Medicine has approved the study (approval number, 3407).

Validation cohort 1: JAAMSR cohort

JAAMSR (Japanese Association for Acute Medicine Sepsis Registry) was a multicenter (ICUs, n = 15, Japan), prospective observational study conducted by the JAAM from June 2010 to May 2011 [17]. Some of the clinical centers were included in both JAAMSR and FORECAST cohorts; however, not all were included in both of these cohorts. All 624 patients screened with sepsis were included in the analyses. The Institutional Review Board of Chiba University Graduate School of Medicine has approved the study (approval number, 3407).

Validation cohort 2: SPH cohort

Patients admitted to the ICU at St. Paul’s Hospital (SPH) in Vancouver, Canada, between July 2000 and January 2004 (n = 1337) were screened [18]. Of these, 1037 patients met the definition of sepsis on ICU admission. Of these, 1004 patients had records of 90-day in-hospital mortality and were included in the analyses. The Institutional Review Board of SPH has approved the study (approval number, H02-50076).

Data collection and definitions

Sepsis and septic shock were defined based on the sepsis-2 criteria [19]. According to the current standard [1], severe sepsis according to the sepsis-2 criteria was assumed as sepsis. Patients with age ≥ 75 years were defined as elderly and < 75 years as non-elderly, based on previous reports [20,21,22]. In this study, the vital signs included BT, HR, mean arterial pressure (MAP), systolic blood pressure (SBP), and RR. The worst vital sign values corresponding to the APACHE II scoring were retrieved within 24 h of the diagnosis of sepsis in all cohorts. Each vital sign was divided into two groups based on the cutoff values from the sepsis-2 and sepsis-3 criteria [1, 19] (additional details are provided in Additional file 1: Table S1). The definition of the suspected site of infection was applied as described elsewhere [16].

Statistical analysis

Our primary analysis used Cox regression to test for hazard of death over 90 days by the vital signs in the elderly and non-elderly groups. We selected this approach to adjust for potential baseline imbalances, including age (per year), sex, chronic steroid use, and APACHE II score (Additional file 1: Table S2, correlation analysis) based on previous reports [18, 23]. Significant discovery results were tested for replication and generalizability in patients of the same ancestry in validation cohort 1 and patients of different ancestry in validation cohort 2. We tested for homogeneity of results across cohorts using a meta-analytic technique. Sensitivity analysis using the Cox regression was conducted by adding parameters with significant difference between the non-elderly and elderly patients including comorbidities as covariates. Sensitivity analyses using age cutoffs of 65, 70, and 80 years old for significant discovery results were conducted [24,25,26,27,28]. Interactions between age and BT for mortality were tested using Cox regression analysis. In addition, the Cox regression analysis for 28-day in-hospital mortality was conducted.

Univariate analysis was performed using Pearson’s chi-square test or a Mann-Whitney U test. Two-tailed P values < 0.05 were considered to be significant. Analyses were performed using either the SPSS software version 24.0 (IBM Corporation, Armonk, NY, USA) or the Review Manager (RevMan) version 5.3 software (The Nordic Cochrane Centre, The Cochrane Collaboration, Copenhagen, Denmark).

Results

There were 628 non-elderly and 520 elderly patients in the discovery FORECAST cohort (Table 1 and Additional file 1: Table S3). Of the vital sign variables on day 1, elderly patients had significantly lower BT and HR compared to non-elderly patients. Elderly patients also had significantly higher 90-day mortality compared to non-elderly patients (Table 1).

Table 1 Baseline characteristics and clinical outcomes in the derivation cohort (FORECAST cohort)
Full size table

Discovery analysis for all vital signs (FORECAST cohort)

In the primary analysis of the five vital signs using Cox regression, non-elderly patients with BT < 36.0 °C had a significantly increased hazard of death over 90 days (P = 0.025, adjusted hazard ratio 1.70, 95% CI 1.07–2.71) (Fig. 1, Fig. 2a). In contrast, elderly patients with hypothermia did not show differences in 90-day mortality (P = 0.16) (Fig. 1, Fig. 2a). In elderly patients, HR > 90 beats/min and RR > 30 breaths/min were associated with increased mortality (HR, P = 0.040, adjusted hazard ratio 1.72, 95% CI 1.03–2.88; RR, P = 0.044, adjusted hazard ratio 1.49, 95% CI 1.01–2.19) (Fig. 1).

Fig. 1
figure 1

Associations between the vital signs and 90-day in-hospital mortality in discovery cohort (FORECAST cohort). Non-elderly patients with BT < 36.0 °C showed a significant increase for hazard of death over 90-day period. The hypothermia was not associated with mortality in elderly patients. Heart rate > 90 beats/min and RR > 30 breaths/min had a significant association for increased mortality in elderly patients. CI, confidence interval. The adjusted hazard ratio was calculated using potentially confounding factors such as the age, sex, chronic steroid use, and acute physiology and chronic health evaluation (APACHE) II score

Full size image
Fig. 2
figure 2

Probability of mortality corresponding to the body temperature category of < 36.0 °C. a Discovery cohort (FORECAST cohort). b Validation cohort 1 (JAAMSR cohort). c Validation cohort 2 (SPH cohort). Non-elderly patients with hypothermia had higher mortality in all three cohorts

Full size image

Validation of significant discovery results (JAAMSR, SPH cohorts)

Non-elderly patients with BT < 36.0 °C showed significantly increased mortality in validation cohort 1 (Japan) (JAAMSR, P = 0.0024, adjusted hazard ratio 2.05, 95% CI 1.29–3.26) (Fig. 2b) (Additional file 1: Table S4, Baseline characteristics). The same effect was replicated in the patients of different ancestry in validation cohort 2 (Canada) (SPH, P = 0.029, adjusted hazard ratio 1.36, 95% CI 1.03–1.80) (Fig. 2c) (Additional file 1: Table S5, Baseline characteristics). Similar to the discovery cohort, there were no significant associations between hypothermia and mortality in elderly patients (JAAMSR, P = 0.34; SPH, P = 0.81) (Fig. 2b, c). Test for homogeneity of the effect of BT < 36.0 °C on mortality using a meta-analytic technique revealed no significant differences across all three cohorts (I2 = 17% in non-elderly patients) (Fig. 3).

Fig. 3
figure 3

Meta-analysis to test for the homogeneity between each study for association of body temperature < 36.0 °C and 90-day in-hospital mortality. Non-elderly patients revealed no significant differences in effect between all three cohorts (I2 = 17%) and a significant combined effect (P = 0.0002, hazard ratio 1.58, 95% CI 1.24–2.01). JP, Japan; CA, Canada; CI, confidence interval. The hazard ratio from each cohorts was calculated with adjusting the potentially confounding factors such as the age, sex, chronic steroid use, and acute physiology and chronic health evaluation (APACHE) II score

Full size image

The effects of HR > 90 beats/min and RR > 30 breaths/min on mortality observed in the elderly patients of the discovery cohort were not replicated in validation cohort 1 (HR > 90 beats/min, P = 0.82; RR > 30 breaths/min, P = 0.96).

Analysis including additional covariates

Repeating the Cox regression analysis including age, sex, chronic steroid use, APACHE II score, and significantly different baseline parameters between non-elderly and elderly patients (FORECAST suspected site of infection, body mass index, Charlson comorbidity index; JAAMSR suspected site of infection, body mass index, comorbidities [stroke, heart failure, chronic lung disease]; SPH comorbidities [chronic hepatic disease, chronic lung disease] (Table 1 and Additional file 1: Table S4 and Table S5)) yielded the same results (Additional file 2: Figure S1).

Analysis using different age cutoffs

We performed the sensitivity analysis for the association of BT < 36.0 °C and mortality using different age cutoff values of 65, 70, and 80 years. The age cutoffs of 70 and 80 years revealed similar results to those observed in the primary analysis. However, the effect of hypothermia was eliminated using a cutoff of 65 years (Additional file 3: Figure S2).

Analysis of fever, the interaction of age and BT, and 28-day in-hospital mortality

Because hypothermia had effects on mortality across all three cohorts, we tested for the effect of fever in all three cohorts in the secondary analysis. In non-elderly patients, a trend towards reduced hazard of death was observed when BT > 38.3 °C in the discovery cohort (P = 0.11, adjusted hazard ratio 0.71, 95% CI 0.47–1.08) (Fig. 1 and Additional file 4: Figure S3a). This potential effect was highly significant in both validation cohorts (JAAMSR, P = 0.0043, adjusted hazard ratio 0.51, 95% CI 0.32–0.81; SPH, P = 0.018, adjusted hazard ratio 0.76, 95% CI 0.61–0.95) (Additional file 4: Figure S3b-c). A meta-analytic test for heterogeneity revealed no significant difference in effect across cohorts (I2 = 14%) and a significant combined effect (P = 0.0006, adjusted hazard ratio 0.70, 95% CI 0.57–0.86) (Additional file 5: Figure S4). However, no significant effect of fever was observed in elderly patients in any cohort (FORECAST, P = 0.71; JAAMSR, P = 0.50; SPH, P = 0.72) (Additional file 4: Figure S3a-c).

The interaction of age (non-elderly or elderly) and hypothermia (BT < 36.0 °C or ≥ 36.0 °C) for mortality was statistically significant across the three cohorts (FORECAST, P = 0.0059; JAAMSR, P = 0.15; SPH, P = 0.012; three cohorts combined, P = 0.0001). The interaction term between the age and fever (BT ≤ 38.3 °C or > 38.3 °C) for mortality was also significant across the three cohorts (FORECAST, P = 0.23; JAAMSR, P = 0.13; SPH, P = 0.033; three cohorts combined, P = 0.005). These results indicate that the BT response (both low and high) has a significant impact on mortality in non-elderly patients but does not appear to have an impact on elderly patients.

Repeating analysis using 28-day mortality yielded similar, but partly stronger relationships between vital signs and mortality as those observed in the primary analysis (Additional file 6: Figure S5).

Discussion

In the present study, non-elderly sepsis patients with hypothermia (BT < 36.0 °C) had significantly increased mortality, and those with fever (BT ≥ 38.3 °C) had decreased mortality. In contrast, hypothermia and fever were not associated with altered mortality in elderly patients. Interestingly, the other vital sign values were not consistently associated with differences in the outcome in patients of any age. Thus, BT was distinct among the vital signs for its association with the clinical outcomes in the non-elderly, but not elderly, patients with sepsis.

The key finding of our analysis is that the association of BT alterations on mortality was only observed in the younger septic population as opposed to elderly patients. The meta-analytic technique showed that there was low heterogeneity (I2 = 17%) in the association between hypothermia and mortality in non-elderly patients in the three cohorts (Fig. 3). In a secondary analysis, the opposite effect of fever was also only observed in non-elderly sepsis patients (Additional file 4: Figure S3 and Additional file 5: Figure S4). The changes in the association between the vital signs and mortality based on age have been investigated in several categories of critically ill patients. In blunt trauma, the presenting vital signs are less predictive of mortality in elderly patients as compared to the non-elderly [14]. Additionally, vital signs are less predictive of in-hospital cardiac arrest in elderly patients as compared to the non-elderly [15]. Since the significant associations of tachycardia and tachypnea on mortality in elderly patients were not replicated in the validation cohorts, we confirmed that BT alterations are uniquely predictive of mortality among the vital signs in non-elderly patients with sepsis but not in the elderly patients. Significant interactions with mortality between hypothermia or fever and age groups reinforced these findings.

In the current understanding of pathomechanism of sepsis-related BT changes, fever and hypothermia both have adaptive biological value for the host. In this context, fever is considered as an indicator of active (disease-fighting) strategy which may be beneficial in diseases of mild-to-moderate severity in a previously healthy host while hypothermia is a passive (disease-tolerating) strategy that is advantageous in severe forms of the disease, especially in the presence of comorbidities [29,30,31]. Nevertheless, BT is not the cause but rather the indicator of the severity, thus consequently of the outcome of the disease. In our previous study employing the FORECAST and JAAMSR cohorts, with no distinction between the non-elderly and elderly sepsis patients, hypothermia was associated with poor clinical outcomes [32, 33]. In another study of adult sepsis patients, hypothermia (< 36.0 °C) within 24 h from sepsis diagnosis was associated with a higher 28-day and 1-year mortality [34]. Oppositely, increased BT in sepsis/septic shock patients admitted to an ICU within 24 h of hospital arrival was associated with decreased mortality [35]. These reports were in line with our results in non-elderly patients.

Several factors could explain the difference in the relationships between the hypothermia and clinical outcome in elderly and non-elderly patients with sepsis. The physiology of fever generation and development of hypothermia is complicated; however, reduced production of pyrogenic cytokines such as IL-6 and TNF-a may be related to the lower incidence of fever seen in elderly septic patients [36, 37]. Comorbidities such as stroke, which was a higher prevalence in the elderly group in this study, may comprise neurological deficits that could impair thermoregulatory/inflammatory reflexes [38, 39]. Decreased heat production due to reduced muscle mass and increased heat radiation due to a reduced fat mass and blunted peripheral vasoconstriction capacity might be related to the lower BTs [40]. Observational studies have indeed reported that higher age populations have lower BTs and smaller diurnal BT variations [41, 42], which is consistent with our results. Lower BT and altered BT response in elderly septic patients as the result of age-related physical and functional deterioration may mitigate the hypothermic/febrile effects on clinical outcomes.

There were several limitations to the present study. First was the descriptive nature of the observational study. The primary findings were validated using two independent cohorts, which included multiple centers and patients of different ancestry; however, these do not prove a causal link. Second limitation of the study was the absence of data on variables that may have confounded BT measurement, including temperature measurement site and whether patients received antipyretics or targeted temperature management. Third was on the retrieval of vital signs. The vital signs corresponding to the APACHE II score were analyzed in the present study. However, according to the APACHE II scoring, a temperature as lower than 34 °C receives 1 point, whereas fever higher than 38.9 °C receives 3 points. Therefore, patients presenting both hypothermia and fever were more likely to be categorized in the fever group, which may have influenced the results. In addition, since the analyzed data were only in the first 24 h after the diagnosis of sepsis, it is unclear whether the duration of hypothermia or temperature changes over time affects the outcome. Another limitation could be the absence of established criteria for defining elderly patients. In this study, we applied the currently accepted standards in literature [20,21,22]. The analyses in the age cutoff of 70 and 80 years yielded the same conclusion, which could help strengthen the results of this study.

Conclusions

We investigated the difference in the associations of the vital signs with mortality between non-elderly and elderly patients with sepsis. Among the vital signs, only BT showed significantly different effects on mortality between non-elderly and elderly patients. Hypothermia is associated with increased mortality and fever with decreased mortality in non-elderly septic patients. In contrast, hypothermia and fever did not impact mortality in elderly patients.

Availability of data and materials

The datasets analyzed during the current study are available with the corresponding author on reasonable request.

Abbreviations

BP:

Blood pressure

BT:

Body temperature

FORECAST:

Focused Outcomes Research in Emergency Care in Acute Respiratory Distress Syndrome, Sepsis, and Trauma

HR:

Heart rate

JAAM:

Japanese Association for Acute Medicine

JAAMSR:

Japanese Association for Acute Medicine Sepsis Registry

MAP:

Mean arterial pressure

RR:

Respiratory rate

SBP:

Systolic blood pressure

SPH:

St. Paul’s Hospital

References

  1. Singer M, Deutschman CS, Seymour CW, Shankar-Hari M, Annane D, Bauer M, et al. The third international consensus definitions for sepsis and septic shock (Sepsis-3). JAMA. 2016;315:801–10.

    Article  CAS  Google Scholar 

  2. Nishida O, Ogura H, Egi M, Fujishima S, Hayashi Y, Iba T, et al. The Japanese clinical practice guidelines for management of sepsis and septic shock 2016 (J-SSCG 2016). Acute Med Surg. 2018;5:3–89.

    Article  Google Scholar 

  3. Wiersinga WJ, Leopold SJ, Cranendonk DR, van der Poll T. Host innate immune responses to sepsis. Virulence. 2014;5:36–44.

    Article  Google Scholar 

  4. Deutschman CS, Raj NR, McGuire EO, Kelz MB. Orexinergic activity modulates altered vital signs and pituitary hormone secretion in experimental sepsis. Crit Care Med. 2013;41:e368–75.

    Article  CAS  Google Scholar 

  5. Yamamoto S, Yamazaki S, Shimizu T, Takeshima T, Fukuma S, Yamamoto Y, et al. Body temperature at the emergency department as a predictor of mortality in patients with bacterial infection. Medicine (Baltimore). 2016;95:e3628.

    Article  Google Scholar 

  6. Peres Bota D, Lopes Ferreira F, Melot C, Vincent JL. Body temperature alterations in the critically ill. Intensive Care Med. 2004;30:811–6.

    Article  Google Scholar 

  7. Hayase N, Yamamoto M, Asada T, Isshiki R, Yahagi N, Doi K. Association of heart rate with N-terminal pro-B-type natriuretic peptide in septic patients: a prospective observational cohort study. Shock. 2016;46:642–8.

    Article  CAS  Google Scholar 

  8. Houwink AP, Rijkenberg S, Bosman RJ, van der Voort PH. The association between lactate, mean arterial pressure, central venous oxygen saturation and peripheral temperature and mortality in severe sepsis: a retrospective cohort analysis. Crit Care. 2016;20:56.

    Article  Google Scholar 

  9. Tang Y, Choi J, Kim D, Tudtud-Hans L, Li J, Michel A, et al. Clinical predictors of adverse outcome in severe sepsis patients with lactate 2-4 mM admitted to the hospital. QJM. 2015;108:279–87.

    Article  CAS  Google Scholar 

  10. Sansoni P, Vescovini R, Fagnoni F, Biasini C, Zanni F, Zanlari L, et al. The immune system in extreme longevity. Exp Gerontol. 2008;43:61–5.

    Article  CAS  Google Scholar 

  11. Linton PJ, Dorshkind K. Age-related changes in lymphocyte development and function. Nat Immunol. 2004;5:133–9.

    Article  CAS  Google Scholar 

  12. Chester JG, Rudolph JL. Vital signs in older patients: age-related changes. J Am Med Dir Assoc. 2011;12:337–43.

    Article  Google Scholar 

  13. Tiruvoipati R, Ong K, Gangopadhyay H, Arora S, Carney I, Botha J. Hypothermia predicts mortality in critically ill elderly patients with sepsis. BMC Geriatr. 2010;10:70.

    Article  Google Scholar 

  14. Heffernan DS, Thakkar RK, Monaghan SF, Ravindran R, Adams CA Jr, Kozloff MS, et al. Normal presenting vital signs are unreliable in geriatric blunt trauma victims. J Trauma. 2010;69:813–20.

    Article  Google Scholar 

  15. Churpek MM, Yuen TC, Winslow C, Hall J, Edelson DP. Differences in vital signs between elderly and nonelderly patients prior to ward cardiac arrest. Crit Care Med. 2015;43:816–22.

    Article  Google Scholar 

  16. Abe T, Ogura H, Shiraishi A, Kushimoto S, Saitoh D, Fujishima S, et al. Characteristics, management, and in-hospital mortality among patients with severe sepsis in intensive care units in Japan: the FORECAST study. Crit Care. 2018;22:322.

    Article  Google Scholar 

  17. Ogura H, Gando S, Saitoh D, Takeyama N, Kushimoto S, Fujishima S, et al. Epidemiology of severe sepsis in Japanese intensive care units: a prospective multicenter study. J Infect Chemother. 2014;20:157–62.

    Article  Google Scholar 

  18. Nakada TA, Russell JA, Boyd JH, Aguirre-Hernandez R, Thain KR, Thair SA, et al. beta2-Adrenergic receptor gene polymorphism is associated with mortality in septic shock. Am J Respir Crit Care Med. 2010;181:143–9.

    Article  CAS  Google Scholar 

  19. Levy MM, Fink MP, Marshall JC, Abraham E, Angus D, Cook D, et al. 2001 SCCM/ESICM/ACCP/ATS/SIS international sepsis definitions conference. Intensive Care Med. 2003;29:530–8.

    Article  Google Scholar 

  20. Ouchi Y, Rakugi H, Arai H, Akishita M, Ito H, Toba K, et al. Redefining the elderly as aged 75 years and older: proposal from the Joint Committee of Japan Gerontological Society and the Japan Geriatrics Society. Geriatr Gerontol Int. 2017;17:1045–7.

    Article  Google Scholar 

  21. Guidet B, Leblanc G, Simon T, Woimant M, Quenot JP, Ganansia O, et al. Effect of systematic intensive care unit triage on long-term mortality among critically ill elderly patients in France: a randomized clinical trial. JAMA. 2017;318:1450–9.

    Article  Google Scholar 

  22. Chou HL, Han ST, Yeh CF, Tzeng IS, Hsieh TH, Wu CC, et al. Systemic inflammatory response syndrome is more associated with bacteremia in elderly patients with suspected sepsis in emergency departments. Medicine (Baltimore). 2016;95:e5634.

    Article  CAS  Google Scholar 

  23. Nakada TA, Wacharasint P, Russell JA, Boyd JH, Nakada E, Thair SA, et al. The IL20 genetic polymorphism is associated with altered clinical outcome in septic shock. J Innate Immun. 2018;10:181–8.

    Article  CAS  Google Scholar 

  24. Martin GS, Mannino DM, Moss M. The effect of age on the development and outcome of adult sepsis. Crit Care Med. 2006;34:15–21.

    Article  Google Scholar 

  25. Blot S, Cankurtaran M, Petrovic M, Vandijck D, Lizy C, Decruyenaere J, et al. Epidemiology and outcome of nosocomial bloodstream infection in elderly critically ill patients: a comparison between middle-aged, old, and very old patients. Crit Care Med. 2009;37:1634–41.

    Article  Google Scholar 

  26. Martin-Loeches I, Guia MC, Vallecoccia MS, Suarez D, Ibarz M, Irazabal M, et al. Risk factors for mortality in elderly and very elderly critically ill patients with sepsis: a prospective, observational, multicenter cohort study. Ann Intensive Care. 2019;9:26.

    Article  Google Scholar 

  27. Flaatten H, De Lange DW, Morandi A, Andersen FH, Artigas A, Bertolini G, et al. The impact of frailty on ICU and 30-day mortality and the level of care in very elderly patients (>/= 80 years). Intensive Care Med. 2017;43:1820–8.

    Article  Google Scholar 

  28. Warmerdam M, Stolwijk F, Boogert A, Sharma M, Tetteroo L, Lucke J, et al. Initial disease severity and quality of care of emergency department sepsis patients who are older or younger than 70 years of age. PLoS One. 2017;12:e0185214.

    Article  Google Scholar 

  29. Schieber AM, Ayres JS. Thermoregulation as a disease tolerance defense strategy. Pathog Dis. 2016;74:ftw106.

  30. Evans SS, Repasky EA, Fisher DT. Fever and the thermal regulation of immunity: the immune system feels the heat. Nat Rev Immunol. 2015;15:335–49.

    Article  CAS  Google Scholar 

  31. Garami A, Steiner AA, Romanovsky AA. Fever and hypothermia in systemic inflammation. Handb Clin Neurol. 2018;157:565–97.

    Article  Google Scholar 

  32. Kushimoto S, Abe T, Ogura H, Shiraishi A, Saitoh D, Fujishima S, et al. Impact of body temperature abnormalities on the implementation of sepsis bundles and outcomes in patients with severe sepsis: a retrospective sub-analysis of the focused outcome research on emergency care for acute respiratory distress syndrome, sepsis and trauma study. Crit Care Med. 2019;47:691–9.

    Article  Google Scholar 

  33. Kushimoto S, Gando S, Saitoh D, Mayumi T, Ogura H, Fujishima S, et al. The impact of body temperature abnormalities on the disease severity and outcome in patients with severe sepsis: an analysis from a multicenter, prospective survey of severe sepsis. Crit Care. 2013;17:R271.

    Article  Google Scholar 

  34. Drewry AM, Fuller BM, Skrupky LP, Hotchkiss RS. The presence of hypothermia within 24 hours of sepsis diagnosis predicts persistent lymphopenia. Crit Care Med. 2015;43:1165–9.

    Article  Google Scholar 

  35. Sunden-Cullberg J, Rylance R, Svefors J, Norrby-Teglund A, Bjork J, Inghammar M. Fever in the emergency department predicts survival of patients with severe sepsis and septic shock admitted to the ICU. Crit Care Med. 2017;45:591–9.

    Article  Google Scholar 

  36. Mackowiak PA, Bartlett JG, Borden EC, Goldblum SE, Hasday JD, Munford RS, et al. Concepts of fever: recent advances and lingering dogma. Clin Infect Dis. 1997;25:119–38.

    Article  CAS  Google Scholar 

  37. Norman DC. Fever in the elderly. Clin Infect Dis. 2000;31:148–51.

    Article  CAS  Google Scholar 

  38. Morrison SF. Central control of body temperature. F1000Res. 2016;5:F1000 Faculty Rev-880.

  39. Cheshire WP Jr. Thermoregulatory disorders and illness related to heat and cold stress. Auton Neurosci. 2016;196:91–104.

    Article  Google Scholar 

  40. Kenney WL, Munce TA. Invited review: aging and human temperature regulation. J Appl Physiol (1985). 2003;95:2598–603.

    Article  Google Scholar 

  41. Waalen J, Buxbaum JN. Is older colder or colder older? The association of age with body temperature in 18,630 individuals. J Gerontol A Biol Sci Med Sci. 2011;66:487–92.

    Article  Google Scholar 

  42. Gomolin IH, Aung MM, Wolf-Klein G, Auerbach C. Older is colder: temperature range and variation in older people. J Am Geriatr Soc. 2005;53:2170–2.

    Article  Google Scholar 

Download references

Acknowledgements

We thank Prof. Toshiaki Iba, MD, PhD, for advice on this project. We also thank all contributors of the JAAM FORECAST group.

The following are the investigators of the JAAM FORECAST Group: Nagasaki University Hospital (Osamu Tasaki), Osaka City University Hospital (Yasumitsu Mizobata), Tokyobay Urayasu Ichikawa Medical Center (Hiraku Funakoshi), Aso Iizuka Hospital (Toshiro Okuyama), Tomei Atsugi Hospital (Iwao Yamashita), Hiratsuka City Hospital (Toshio Kanai), National Hospital Organization Sendai Medical Center (Yasuo Yamada), Ehime University Hospital (Mayuki Aibiki), Okayama University Hospital (Keiji Sato), Tokuyama Central Hospital (Susumu Yamashita), Fukuyama City Hospital (Susumu Yamashita), JA Hiroshima General Hospital (Kenichi Yoshida), Kumamoto University Hospital (Shunji Kasaoka), Hachinohe City Hospital (Akihide Kon), Osaka City General Hospital (Hiroshi Rinka), National Hospital Organization Disaster Medical Center (Hiroshi Kato), University of Toyama (Hiroshi Okudera), Sapporo Medical University (Eichi Narimatsu), Okayama Saiseikai General Hospital (Toshifumi Fujiwara), Juntendo University Nerima Hospital (Manabu Sugita), National Hospital Organization Hokkaido Medical Center (Yasuo Shichinohe), Akita University Hospital (Hajime Nakae), Japanese Red Cross Society Kyoto Daini Hospital (Ryouji Iiduka), Maebashi Red Cross Hospital (Mitsunobu Nakamura), Sendai City Hospital (Yuji Murata), Subaru Health Insurance Society Ota Memorial Hospital (Yoshitake Sato), Fukuoka University Hospital (Hiroyasu Ishikura), Ishikawa Prefectural Central Hospital (Yasuhiro Myojo), Shiga University of Medical Science (Yasuyuki Tsujita), Nihon University School of Medicine (Kosaku Kinoshita), Seirei Yokohama General Hospital (Hiroyuki Yamaguchi), National Hospital Organization Kumamoto Medical Center (Toshihiro Sakurai), Saiseikai Utsunomiya Hospital (Satoru Miyatake), National Hospital Organization Higashi-Ohmi General Medical Center (Takao Saotome), National Hospital Organization Mito Medical Center (Susumu Yasuda), Tsukuba Medical Center Hospital (Toshikazu Abe), Osaka University Graduate School of Medicine (Hiroshi Ogura, Yutaka Umemura), Kameda Medical Center (Atsushi Shiraishi), Tohoku University Graduate School of Medicine (Shigeki Kushimoto), National Defense Medical College (Daizoh Saitoh), Keio University School of Medicine (Seitaro Fujishima, Junichi Sasaki), University of Occupational and Environmental Health (Toshihiko Mayumi), Kawasaki Medical School (Yasukazu Shiino), Chiba University Graduate School of Medicine (Taka-aki Nakada), Kyorin University School of Medicine (Takehiko Tarui), Kagawa University Hospital (Toru Hifumi), Tokyo Medical and Dental University (Yasuhiro Otomo), Hyogo College of Medicine (Joji Kotani), Saga University Hospital (Yuichiro Sakamoto), Aizu Chuo Hospital (Shin-ichiro Shiraishi), Kawasaki Municipal Kawasaki Hospital (Kiyotsugu Takuma), Yamaguchi University Hospital (Ryosuke Tsuruta), Center Hospital of the National Center for Global Health and Medicine (Akiyoshi Hagiwara), Osaka General Medical Center (Kazuma Yamakawa), Aichi Medical University Hospital (Naoshi Takeyama), Kurume University Hospital (Norio Yamashita), Teikyo University School of Medicine (Hiroto Ikeda), Rinku General Medical Center (Yasuaki Mizushima), and Hokkaido University Graduate School of Medicine (Satoshi Gando).

Consortia

JAAM FORECAST Group

Osamu Tasaki, Yasumitsu Mizobata, Hiraku Funakoshi, Toshiro Okuyama, Iwao Yamashita, Toshio Kanai, Yasuo Yamada, Mayuki Aibiki, Keiji Sato, Susumu Yamashita, Kenichi Yoshida, Shunji Kasaoka, Akihide Kon, Hiroshi Rinka, Hiroshi Kato, Hiroshi Okudera, Eichi Narimatsu, Toshifumi Fujiwara, Manabu Sugita, Yasuo Shichinohe, Hajime Nakae, Ryouji Iiduka, Mitsunobu Nakamura, Yuji Murata, Yoshitake Sato, Hiroyasu Ishikura, Yasuhiro Myojo, Yasuyuki Tsujita, Kosaku Kinoshita, Hiroyuki Yamaguchi, Toshihiro Sakurai, Satoru Miyatake, Takao Saotome, Susumu Yasuda, Toshikazu Abe, Hiroshi Ogura, Yutaka Umemura, Atsushi Shiraishi, Shigeki Kushimoto, Daizoh Saitoh, Seitaro Fujishima, Junichi Sasaki, Toshihiko Mayumi, Yasukazu Shiino, Taka-aki Nakada, Takehiko Tarui, Toru Hifumi, Yasuhiro Otomo, Joji Kotani, Yuichiro Sakamoto, Shin-ichiro Shiraishi, Kiyotsugu Takuma, Ryosuke Tsuruta, Akiyoshi Hagiwara, Kazuma Yamakawa, Naoshi Takeyama, Norio Yamashita, Hiroto Ikeda, Yasuaki Mizushima, and Satoshi Gando.

Funding

This work was supported by the Japanese Association for Acute Medicine (JAAM) and Kashiwado Memorial Foundation for Medical Research. Both the JAAM and Kashiwado Memorial Foundation for Medical Research had no role in the study design, analysis of the data, or preparation of the manuscript.

Author information

Authors and Affiliations

  1. Department of Emergency and Critical Care Medicine, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo, Chiba, 260-8677, Japan

    Takashi Shimazui, Taka-aki Nakada & Taku Oshima

  2. Centre for Heart Lung Innovation, University of British Columbia, Vancouver, Canada

    Keith R. Walley

  3. Department of General Medicine, Juntendo University, Tokyo, Japan

    Toshikazu Abe

  4. Health Services Research and Development Center, University of Tsukuba, Tsukuba, Japan

    Toshikazu Abe

  5. Department of Traumatology and Acute Critical Medicine, Osaka University Graduate School of Medicine, Osaka, Japan

    Hiroshi Ogura & Yutaka Umemura

  6. Emergency and Trauma Center, Kameda Medical Center, Kamogawa, Japan

    Atsushi Shiraishi

  7. Division of Emergency and Critical Care Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan

    Shigeki Kushimoto

  8. Division of Traumatology, Research Institute, National Defense Medical College, Tokorozawa, Japan

    Daizoh Saitoh

  9. Center for General Medicine Education, Keio University School of Medicine, Tokyo, Japan

    Seitaro Fujishima

  10. Department of Emergency Medicine, School of Medicine, University of Occupational and Environmental Health, Kitakyushu, Japan

    Toshihiko Mayumi

  11. Department of Acute Medicine, Kawasaki Medical School, Kurashiki, Japan

    Yasukazu Shiino

  12. Department of Trauma and Critical Care Medicine, Kyorin University School of Medicine, Mitaka, Japan

    Takehiko Tarui

  13. Department of Emergency and Critical Care Medicine, St. Luke’s International Hospital, Tokyo, Japan

    Toru Hifumi

  14. Trauma and Acute Critical Care Center, Medical Hospital, Tokyo Medical and Dental University, Tokyo, Japan

    Yasuhiro Otomo

  15. Department of Surgery, Center for Gastroenterology and Liver Disease, Kitakyushu City Yahata Hospital, Kitakyushu, Japan

    Kohji Okamoto

  16. Division of Disaster and Emergency Medicine, Department of Surgery Related, Kobe University Graduate School of Medicine, Kobe, Japan

    Joji Kotani

  17. Emergency and Critical Care Medicine, Saga University Hospital, Saga, Japan

    Yuichiro Sakamoto

  18. Department of Emergency and Critical Care Medicine, Keio University School of Medicine, Tokyo, Japan

    Junichi Sasaki

  19. Department of Emergency and Critical Care Medicine, Aizu Chuo Hospital, Aizuwakamatsu, Japan

    Shin-ichiro Shiraishi

  20. Emergency & Critical Care Center, Kawasaki Municipal Kawasaki Hospital, Kawasaki, Japan

    Kiyotsugu Takuma

  21. Advanced Medical Emergency & Critical Care Center, Yamaguchi University Hospital, Ube, Japan

    Ryosuke Tsuruta

  22. Center Hospital of the National Center for Global Health and Medicine, Tokyo, Japan

    Akiyoshi Hagiwara

  23. Division of Trauma and Surgical Critical Care, Osaka General Medical Center, Osaka, Japan

    Kazuma Yamakawa & Satoshi Fujimi

  24. Department of Emergency and Critical Care Medicine, Nippon Medical School, Tokyo, Japan

    Tomohiko Masuno

  25. Advanced Critical Care Center, Aichi Medical University Hospital, Nagakute, Japan

    Naoshi Takeyama

  26. Advanced Emergency Medical Service Center, Kurume University Hospital, Kurume, Japan

    Norio Yamashita

  27. Department of Emergency Medicine, Teikyo University School of Medicine, Tokyo, Japan

    Hiroto Ikeda

  28. Department of Trauma, Critical Care Medicine, and Burn Center, Japan Community Healthcare Organization, Chukyo Hospital, Nagoya, Japan

    Masashi Ueyama

  29. Division of Acute and Critical Care Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan

    Satoshi Gando

  30. Acute and Critical Care Center, Department of Acute and Critical Care Medicine, Sapporo Higashi Tokushukai Hospital, Sapporo, Japan

    Satoshi Gando

Authors
  1. Takashi Shimazui
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Taka-aki Nakada
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Keith R. Walley
    View author publications

    You can also search for this author in PubMed Google Scholar

  4. Taku Oshima
    View author publications

    You can also search for this author in PubMed Google Scholar

  5. Toshikazu Abe
    View author publications

    You can also search for this author in PubMed Google Scholar

  6. Hiroshi Ogura
    View author publications

    You can also search for this author in PubMed Google Scholar

  7. Atsushi Shiraishi
    View author publications

    You can also search for this author in PubMed Google Scholar

  8. Shigeki Kushimoto
    View author publications

    You can also search for this author in PubMed Google Scholar

  9. Daizoh Saitoh
    View author publications

    You can also search for this author in PubMed Google Scholar

  10. Seitaro Fujishima
    View author publications

    You can also search for this author in PubMed Google Scholar

  11. Toshihiko Mayumi
    View author publications

    You can also search for this author in PubMed Google Scholar

  12. Yasukazu Shiino
    View author publications

    You can also search for this author in PubMed Google Scholar

  13. Takehiko Tarui
    View author publications

    You can also search for this author in PubMed Google Scholar

  14. Toru Hifumi
    View author publications

    You can also search for this author in PubMed Google Scholar

  15. Yasuhiro Otomo
    View author publications

    You can also search for this author in PubMed Google Scholar

  16. Kohji Okamoto
    View author publications

    You can also search for this author in PubMed Google Scholar

  17. Yutaka Umemura
    View author publications

    You can also search for this author in PubMed Google Scholar

  18. Joji Kotani
    View author publications

    You can also search for this author in PubMed Google Scholar

  19. Yuichiro Sakamoto
    View author publications

    You can also search for this author in PubMed Google Scholar

  20. Junichi Sasaki
    View author publications

    You can also search for this author in PubMed Google Scholar

  21. Shin-ichiro Shiraishi
    View author publications

    You can also search for this author in PubMed Google Scholar

  22. Kiyotsugu Takuma
    View author publications

    You can also search for this author in PubMed Google Scholar

  23. Ryosuke Tsuruta
    View author publications

    You can also search for this author in PubMed Google Scholar

  24. Akiyoshi Hagiwara
    View author publications

    You can also search for this author in PubMed Google Scholar

  25. Kazuma Yamakawa
    View author publications

    You can also search for this author in PubMed Google Scholar

  26. Tomohiko Masuno
    View author publications

    You can also search for this author in PubMed Google Scholar

  27. Naoshi Takeyama
    View author publications

    You can also search for this author in PubMed Google Scholar

  28. Norio Yamashita
    View author publications

    You can also search for this author in PubMed Google Scholar

  29. Hiroto Ikeda
    View author publications

    You can also search for this author in PubMed Google Scholar

  30. Masashi Ueyama
    View author publications

    You can also search for this author in PubMed Google Scholar

  31. Satoshi Fujimi
    View author publications

    You can also search for this author in PubMed Google Scholar

  32. Satoshi Gando
    View author publications

    You can also search for this author in PubMed Google Scholar

Consortia

on behalf of the JAAM FORECAST Group

  • Takashi Shimazui
  • , Taka-aki Nakada
  • , Keith R. Walley
  • , Taku Oshima
  • , Toshikazu Abe
  • , Hiroshi Ogura
  • , Atsushi Shiraishi
  • , Shigeki Kushimoto
  • , Daizoh Saitoh
  • , Seitaro Fujishima
  • , Toshihiko Mayumi
  • , Yasukazu Shiino
  • , Takehiko Tarui
  • , Toru Hifumi
  • , Yasuhiro Otomo
  • , Kohji Okamoto
  • , Yutaka Umemura
  • , Joji Kotani
  • , Yuichiro Sakamoto
  • , Junichi Sasaki
  • , Shin-ichiro Shiraishi
  • , Kiyotsugu Takuma
  • , Ryosuke Tsuruta
  • , Akiyoshi Hagiwara
  • , Kazuma Yamakawa
  • , Tomohiko Masuno
  • , Naoshi Takeyama
  • , Norio Yamashita
  • , Hiroto Ikeda
  • , Masashi Ueyama
  • , Satoshi Fujimi
  • , Satoshi Gando
  • , Osamu Tasaki
  • , Yasumitsu Mizobata
  • , Hiraku Funakoshi
  • , Toshiro Okuyama
  • , Iwao Yamashita
  • , Toshio Kanai
  • , Yasuo Yamada
  • , Mayuki Aibiki
  • , Keiji Sato
  • , Susumu Yamashita
  • , Kenichi Yoshida
  • , Shunji Kasaoka
  • , Akihide Kon
  • , Hiroshi Rinka
  • , Hiroshi Kato
  • , Hiroshi Okudera
  • , Eichi Narimatsu
  • , Toshifumi Fujiwara
  • , Manabu Sugita
  • , Yasuo Shichinohe
  • , Hajime Nakae
  • , Ryouji Iiduka
  • , Mitsunobu Nakamura
  • , Yuji Murata
  • , Yoshitake Sato
  • , Hiroyasu Ishikura
  • , Yasuhiro Myojo
  • , Yasuyuki Tsujita
  • , Kosaku Kinoshita
  • , Hiroyuki Yamaguchi
  • , Toshihiro Sakurai
  • , Satoru Miyatake
  • , Takao Saotome
  • , Susumu Yasuda
  • , Toshikazu Abe
  • , Hiroshi Ogura
  • , Yutaka Umemura
  • , Atsushi Shiraishi
  • , Shigeki Kushimoto
  • , Daizoh Saitoh
  • , Seitaro Fujishima
  • , Junichi Sasaki
  • , Toshihiko Mayumi
  • , Yasukazu Shiino
  • , Taka-aki Nakada
  • , Takehiko Tarui
  • , Toru Hifumi
  • , Yasuhiro Otomo
  • , Joji Kotani
  • , Yuichiro Sakamoto
  • , Shin-ichiro Shiraishi
  • , Kiyotsugu Takuma
  • , Ryosuke Tsuruta
  • , Akiyoshi Hagiwara
  • , Kazuma Yamakawa
  • , Naoshi Takeyama
  • , Norio Yamashita
  • , Hiroto Ikeda
  • , Yasuaki Mizushima
  •  & Satoshi Gando

Contributions

T.S., T.N., K.R.W., and T.O.: conception and design, acquisition of data, analysis and interpretation of data, and drafting the article and revising it critically for important intellectual content. All other authors: acquisition of data and interpretation of data, and revising the article critically for important intellectual content. All authors gave final approval of the version to be published.

Corresponding author

Correspondence to Taka-aki Nakada.

Ethics declarations

Ethics approval and consent to participate

The study protocol to analyze the FORECAST and JAAMSR cohorts was reviewed and approved by the Institutional Review Board of Chiba University Graduate School of Medicine (approval number, 3407). The study protocol to analyze the SPH cohort was reviewed and approved by the Institutional Review Board of SPH (approval number, H02-50076). Written informed consent was waived because of the study design.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

Additional information

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Supplementary information

Additional file 1: Table S1.

Cut-off values of the vital signs. Table S2. Correlation analysis between APACHE II score and vital signs. Table S3. Baseline characteristics and clinical outcomes between the subgroups of 90-day in-hospital survivors and non-survivors in nonelderly and elderly patients of derivation cohort (FORECAST cohort). Table S4. Baseline characteristics and clinical outcomes in validation cohort 1 (JAAMSR cohort). Table S5. Baseline characteristics and clinical outcomes in validation cohort 2 (SPH cohort).

Additional file 2: Figure S1.

Associations between the vital signs and 90-day in-hospital mortality adjusted with additional covariates which associated with age related-changes. a. Discovery analysis (FORECAST cohort). b. Validation analyses (JAAMSR cohort and SPH cohort).

Additional file 3: Figure S2.

Associations between the body temperature < 36.0 °C and 90-day in-hospital mortality using different age cut-offs. a. 65 years cut-off. b. 70 years cut-off. c. 80 years cut-off.

Additional file 4: Figure S3.

Probability of mortality corresponding to the body temperature category of > 38.3 °C. a. Discovery cohort (FORECAST cohort). b. Validation cohort 1 (JAAMSR cohort). c. Validation cohort 2 (SPH cohort).

Additional file 5: Figure S4.

Meta-analysis to test for the homogeneity between each studies for association of body temperature > 38.3 °C and 90-day in-hospital mortality.

Additional file 6: Figure S5.

Associations between the vital signs and 28-day in-hospital mortality in discovery cohort (FORECAST cohort).

Rights and permissions

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated in a credit line to the data.

Reprints and permissions

About this article

Check for updates. Verify currency and authenticity via CrossMark

Cite this article

Shimazui, T., Nakada, Ta., Walley, K.R. et al. Significance of body temperature in elderly patients with sepsis. Crit Care 24, 387 (2020). https://doi.org/10.1186/s13054-020-02976-6

Download citation

  • Received:

  • Accepted:

  • Published:

  • DOI: https://doi.org/10.1186/s13054-020-02976-6

Keywords

Critical Care

ISSN: 1364-8535