Table 3

Predictive value of oximetry-detected pulsus paradoxus at arrival on severity of acute asthma based on PASS

Severity (PASS*)PP present (n=78)PP absent (n=207)P valuePPV (%) (95% CI)NPV (%) (95% CI)LR+
(95% CI)
LR–
(95% CI)
Mild (0)00 <0.001 87.2 (77.7 to 93.7)57.5 (50.4 to 64.3)5.6 (3.0 to 10.5)0.6 (0.5 to 0.7)
Moderate (1–-3)10 (12.8%)119 (57.5%)
Severe (4–6)68 (87.2%)88 (42.5%)
  • P value of less than 0.05 is considered significant.

  • *PASS scoring includes wheeze, work of breathing and prolonged expiratory phase.

  • LR+, positive likelihood ratio; LR–, negative likelihood ratio; NPV, negative predictive value; PASS, Pediatric Asthma Severity Score; PP, pulsus paradoxus; PPV, positive predictive value.