Respiratory influence on right and left ventricular diastolic function in normal children

Area of Science:

• Pediatric Cardiology
• Cardiovascular Physiology
• Echocardiography

Background:

• Diastolic function assessment in children is crucial for diagnosing heart conditions.
• Respiratory variations can influence hemodynamic parameters and ventricular filling.
• Understanding these variations is key to accurate interpretation of echocardiographic data.

Purpose of the Study:

• To investigate the effects of respiration on Doppler echocardiographic variables of diastolic function in normal children.
• To determine if respiratory phase influences left ventricular (LV) and right ventricular (RV) filling parameters.
• To establish the need for respiratory standardization in pediatric diastolic function assessment.

Main Methods:

• Doppler echocardiograms of tricuspid and mitral valves were recorded in 20 healthy children (1.5-11 years).
• Electrocardiogram and respiration phase were simultaneously monitored.
• Key diastolic filling variables (peak E velocity, E/A ratio, etc.) were analyzed during inspiration and expiration.

Main Results:

• Inspiration led to significant decreases in early diastolic LV filling variables (peak E velocity, E/A ratio, etc.).
• Inspiration caused significant increases in RV peak E and peak A velocities, indicating enhanced RV filling.
• Late active atrial emptying variables in the LV were unchanged by respiration; RV filling enhancement was consistent across early and late diastole.

Conclusions:

• Inspiration significantly enhances RV venous return and filling, while LV filling decreases due to complex interplay of preload, afterload, and ventricular interdependence.
• Assessment of pediatric RV and LV diastolic function requires standardization for the phase of respiration.
• These findings highlight the importance of considering respiratory variations for accurate interpretation of pediatric echocardiograms.