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Skeletal Muscle Pathology in Pulmonary Arterial Hypertension and Its Contribution to Exercise Intolerance
Thaís C F Menezes1, Michael H Lee2, Dara C Fonseca Balladares2
1Division of Respiratory Diseases, Department of Medicine, Hospital São Paulo Federal University of São Paulo (UNIFESP) São Paulo Brazil.
Journal of the American Heart Association
|February 8, 2025
Summary
Pulmonary arterial hypertension (PAH) causes exercise intolerance due to complex factors. Recent research highlights skeletal muscle issues as a key contributor to reduced exercise capacity in PAH patients.
Area of Science:
- Cardiovascular Medicine
- Respiratory Medicine
- Exercise Physiology
Background:
- Pulmonary arterial hypertension (PAH) is a vascular disease increasing pulmonary artery pressure.
- PAH disrupts right heart and pulmonary circulation coordination.
- Exercise intolerance significantly impacts PAH patients' quality of life.
Purpose of the Study:
- To explore the multifactorial pathophysiology of exercise intolerance in PAH.
- To investigate the contribution of skeletal muscle to reduced exercise capacity in PAH.
- To highlight emerging concepts in PAH exercise intolerance.
Main Methods:
- Literature review of recent studies on PAH pathophysiology.
- Analysis of factors contributing to exercise intolerance.
- Focus on skeletal muscle's role in PAH-related exercise limitation.
Main Results:
- Right ventricle impairment and V/Q mismatch are established factors.
- Skeletal muscle pathophysiology is increasingly recognized as a significant contributor.
- This multifactorial approach offers a broader understanding of exercise limitation in PAH.
Conclusions:
- Exercise intolerance in PAH is complex and involves multiple systems.
- Skeletal muscle dysfunction plays a crucial role in reduced exercise capacity.
- Further research into skeletal muscle's role can inform new therapeutic strategies for PAH.
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