Pulmonary ultrasound and pulse oximetry versus chest radiography and arterial blood gas analysis for the diagnosis of acute respiratory distress syndrome: a pilot study

Table 3 Performance of ultrasound diagnosis of ultrasound interstitial syndrome (UIS) as a marker of bilateral pulmonary opacities consistent with acute respiratory distress syndrome

UIS threshold		Number of observations (n = 101)			Test characteristic		95 % CI
1 lung field bilaterally			Bilateral opacities on chest radiograph
			Present	Absent	Sensitivity	86 %	70–95
	UIS	Present	30	41	Specificity	38 %	26–51
	UIS	Absent	5	25	PPV	42 %	31–55
					NPV	83 %	65–94
Bilateral; 3 lung fields minimum			Bilateral opacities on chest radiograph
			Present	Absent	Sensitivity	80 %	63–92
	UIS	Present	28	25	Specificity	62 %	49–74
	UIS	Absent	7	41	PPV	53 %	39–67
					NPV	85 %	72–94
2 lung fields bilaterally			Bilateral opacities on chest radiograph
			Present	Absent	Sensitivity	60 %	42–76
	UIS	Present	21	15	Specificity	77 %	65–87
		Absent	14	51	PPV	58 %	41–75
					NPV	79 %	67–88

CI confidence interval, NPV negative predictive value, PPV positive predictive value

ISSN: 1364-8535