Pulsus paradoxus in asthmatic children

Area of Science:

• Pediatric Pulmonology
• Critical Care Medicine

Background:

• Pulsus paradoxus is an established indicator of asthma severity in adults.
• Its utility in assessing asthma severity in pediatric patients remains less defined.

Purpose of the Study:

• To determine if pulsus paradoxus is a reliable indicator of asthma severity in children.
• To correlate pulsus paradoxus measurements with objective measures of airway obstruction.

Main Methods:

• Respiratory fluctuations in systolic blood pressure were measured in 24 children during asthma attacks.
• 1-second forced expiratory volume (FEV1) was used to quantify airway obstruction.
• Systolic pressure fluctuations were compared between asthmatic and non-asthmatic children.

Main Results:

• A pulsus paradoxus exceeding 15 mm Hg was observed only when FEV1 was less than 60% of predicted.
• A highly significant correlation (P < 0.001) was found between pulsus paradoxus magnitude and airway obstruction severity.
• Non-asthmatic children exhibited minimal systolic pressure fluctuations (≤7 mm Hg) during respiration.

Conclusions:

• Pulsus paradoxus (≥15 mm Hg) is a valuable clinical sign for identifying severe asthma exacerbations in children.
• This finding is consistent with its established role in adult asthma assessment.
• The measurement provides a non-invasive method to gauge the critical nature of pediatric asthma attacks.