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Paced skeletal muscle for dynamic cardiomyoplasty
G J Magovern1, F R Heckler, S B Park
1Department of Surgery, Allegheny General Hospital, Pittsburgh, PA 15212.
The Annals of Thoracic Surgery
|June 1, 1988
Summary
Left latissimus dorsi (LD) muscle flaps can be conditioned to improve cardiac function after myocardial infarction. Electrical conditioning transforms skeletal muscle into fatigue-resistant fibers, enhancing heart repair in some patients.
Area of Science:
- Cardiovascular Surgery
- Regenerative Medicine
- Skeletal Muscle Physiology
Background:
- Patients with myocardial infarction and diffuse coronary artery disease often develop heart failure.
- Surgical interventions aim to restore cardiac function and improve patient outcomes.
- The left latissimus dorsi (LD) muscle flap is a potential autologous graft for cardiac repair.
Observation:
- Four patients with myocardial infarction underwent LD muscle flap application to the left ventricle.
- Muscle conditioning, either pre- or post-operatively, was performed to enhance flap viability and function.
- Biopsies confirmed transformation of skeletal muscle to fatigue-resistant type I fibers within 6-10 weeks.
Findings:
- Three patients showed improved ejection fraction post-procedure, particularly when paced.
- Doppler echocardiography confirmed flap function in both paced and non-paced states.
- One patient experienced flap failure due to infection, leading to death from ventricular arrhythmia.
Implications:
- Electrically conditioned LD muscle flaps show potential for improving cardiac function in select patients.
- This technique may offer a novel therapeutic approach for heart failure post-myocardial infarction.
- Further research is needed to optimize patient selection and surgical techniques to mitigate risks like flap failure.