Microbubbles associated with mitral valve prostheses in pediatric patients.

Area of Science:

• Pediatric Cardiology
• Echocardiography
• Biomedical Engineering

Background:

• Microbubbles are observed in patients with mechanical mitral valve prostheses.
• The clinical significance of these microbubbles, which can reach the cerebral circulation, is unknown.
• No prior studies have investigated microbubbles in pediatric patients with mitral valve prostheses.

Purpose of the Study:

• To determine the association between microbubbles and mitral valve prostheses in children.
• To investigate the effect of exercise on microbubble presence in pediatric patients.

Main Methods:

• Transthoracic echocardiography was performed on 30 children (mean age 10.4 years) post-mechanical mitral valve replacement.
• Cardiac output and ejection fraction were calculated at baseline and after exercise.
• Studies were analyzed for the presence and quantity of microbubbles.

Main Results:

• Microbubbles were detected in 93% of the evaluated children.
• Exercise led to an increased number of microbubbles in 15 of 26 children.
• The increase in microbubbles was positively correlated with increased cardiac output.

Conclusions:

• Microbubbles are frequently observed in pediatric patients with mechanical mitral prostheses.
• Exercise augments the presence of microbubbles in this population.
• The long-term implications of microbubbles are a concern for children with prostheses due to their expected lifespan.