Exercise Capacity Following Pulmonary Embolism in Children and Adolescents

Area of Science:

• Cardiology
• Pulmonology
• Pediatric Medicine

Background:

• Self-reported physical activity is reduced in children after pulmonary embolism (PE).
• Objective measures of exercise capacity and pathophysiology post-PE in children are not well understood.

Purpose of the Study:

• To compare exercise capacity in pediatric PE survivors versus controls one year after diagnosis.
• To investigate factors associated with reduced exercise capacity and identify underlying causes.

Main Methods:

• A case-control study comparing 25 pediatric PE survivors with 25 healthy controls using cardiopulmonary exercise testing (CPET).
• Assessed peak oxygen consumption ( $\dot{V}$ o₂peak), ventilatory inefficiency, and stroke volume augmentation.
• Logistic regression analyzed associations between clinical/radiologic features and low exercise capacity.

Main Results:

• Reduced exercise capacity ( $\dot{V}$ o₂peak < 80% predicted) was found in 32% of PE survivors versus 8% of controls (P = .034).
• PE survivors with low capacity showed increased ventilatory inefficiency (P = .01) and decreased oxygen pulse (P = .001), indicating cardiovascular limitation.
• No association was found between PE severity, obstruction, or RV dysfunction and reduced exercise capacity.

Conclusions:

• Abnormal exercise capacity of cardiopulmonary origin affects one in three pediatric PE survivors, even with treatment.
• Cardiorespiratory fitness assessment is crucial for developing rehabilitation strategies post-pediatric PE.