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Severe and early quadriceps weakness in mechanically ventilated patients
Critical Care volume 18, Article number: 431 (2014)
ICU-acquired weakness has been reported in patients with prolonged mechanical ventilation , leading to prolonged weaning, poor quality of life after ICU discharge, and high ICU-related cost . Muscle weakness is the primary manifestation of critical illness polyneuropathy or myopathy or both.
Although quadriceps strength has never been objectively quantified in the ICU, we previously evidenced quadriceps muscle weakness by using magnetic stimulation of the femoral nerve in patients with chronic obstructive pulmonary disease (COPD) and this non-invasive technique allows a non-effort-dependent assessment of quadriceps strength [3, 4]. Thus, one objective of this pilot study was to evaluate the feasibility of assessing quadriceps strength by using this previously validated technique in sedated patients on mechanical ventilation at different stages after ICU admission using magnetic stimulation of the femoral nerve. The study was approved by the ethics committee of the Institut Universitaire de Cardiologie et de Pneumologie de Québec (CER20392). Signed informed consent was obtained from relatives for all patients.
Quadriceps twitch tension (Twq) assessment was performed in 13 consecutive sedated and mechanically ventilated patients with organ failure (Table 1). Twq measurements were repeated after awakening in nine patients. Mean Twq was 1.8 ± 1.3 kg for the whole group of patients. As shown in Figure 1, Twq was two times lower in ICU patients than in COPD patients (P <0.001) and four times lower than in healthy subjects (P <0.001). Furthermore, there was no significant difference in Twq when patients were sedated or awake. The reproducibility between these two measurements was good (Figure 2). Strength measurements have been performed in patients during septic shock (n = 2) or after a dialysis session (n = 2), and a major reduction of muscle strength (Twq <1 kg) was observed in these circumstances.
Our results confirm the evidence of early severe muscle weakness in mechanically ventilated patients and show that measurement of muscle strength by magnetic stimulation of the femoral nerve may be useful in ICU patients, particularly for assessing recovery or the effect of therapeutic interventions, as previously suggested by Ginz and colleagues . A noteworthy result is that some events (such as dialysis and sepsis) may modify the muscle strength and need to be considered when interpreting muscle strength data in this context. Our data showing that muscle weakness is an early process in the ICU favor early treatment to prevent rather than delay treatment to treat this condition.
Chronic obstructive pulmonary disease
Quadriceps twitch tension.
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Funding was provided by the Canadian Foundation for Innovation (FRSQ).
The authors declare that they have no competing interests.
IV and FL contributed to the study concept and design, data analysis, the interpretation of results, and the writing of the manuscript. A-AD, DS, SV, GB, and PG participated in the recruitment of patients, data acquisition, and the writing of the manuscript. SP, MS, and RB participated in the recruitment of patients. FM contributed to the study concept and design and the writing of the manuscript. All authors read and approved the final manuscript.
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Vivodtzev, I., Devost, A., Saey, D. et al. Severe and early quadriceps weakness in mechanically ventilated patients. Crit Care 18, 431 (2014) doi:10.1186/cc13888
- Chronic Obstructive Pulmonary Disease
- Muscle Strength
- Muscle Weakness
- Chronic Obstructive Pulmonary Disease Patient