Table 5

Associations of oximetry-detected PP, after initial inhaled bronchodilator therapy, with primary outcomes

PP present (n=40)PP absent (n=222*)Relative risk (95% CI)P value
Use of adjuncts (intravenous MgSO4, aminophylline)9 (22.5%)4 (1.8%)12.5 (4.0 to 38.6) <0.001
Need for supplementary ventilation (non-invasive or endotracheal intubation)3 (7.5%)3 (1.4%)5.6 (1.2 to 26.5) 0.048
Need for HDU or ICU care15 (37.5%)15 (6.8%)5.6 (3.0 to 10.4) <0.001
  • P value of less than 0.05 is considered significant.

  • *23 patients could not be assessed for presence of pulsus paradoxus after initial inhaled bronchodilator therapy.

  • HDU, high dependency unit; ICU, intensive care unit; MgSO4, magnesium sulfate; PP, pulsus paradoxus.