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Activity-rest stimulation protocol improves cardiac assistance in dynamic cardiomyoplasty
Gianluca Rigatelli1, Ugo Carraro, Mario Barbiero
1Department of Cardiology, Interventional Cardiology Lab and Cardiomyoplasty Project Unit, Legnago General Hospital, Verona, Italy. jackyheart@katamail.com
Summary
Doppler flow wire effectively measures aortic flow in demand dynamic cardiomyoplasty (DDCMP), showing increased flow and correlated muscle contraction. This demonstrates significant systolic assistance and improved muscle performance in DDCMP patients.
Area of Science:
- Cardiovascular Surgery
- Biomedical Engineering
- Cardiac Assist Devices
Background:
- Demand dynamic cardiomyoplasty (DDCMP) lacks published data on cardiac assistance efficacy.
- Assessing beat-to-beat aortic flow velocity is crucial for evaluating DDCMP effectiveness.
Purpose of the Study:
- To test the efficacy of a Doppler flow wire for measuring beat-to-beat aortic flow velocity.
- To evaluate cardiac assistance in patients undergoing DDCMP.
Main Methods:
- Utilized a 0.018-inch peripheral Doppler flow wire in seven DDCMP patients.
- Recorded aortic flow velocity and Latissimus dorsi (LD) mechanogram during stimulated and unstimulated periods.
- Analyzed peak aortic flow velocity and LD tetanic fusion frequency (TFF).
Main Results:
- Follow-up showed improved tetanic fusion frequency (TFF) and ejection fraction, with lower NYHA class.
- Aortic flow velocity increased significantly during assisted versus rest and unassisted beats.
- A linear correlation (r²=0.53) was observed between increased flow velocity and LD wrap TFF.
Conclusions:
- Systolic assistance in DDCMP is significant and correlates with LD contraction speed.
- Demand stimulation protocols preserve muscle properties and enhance muscle performance in DDCMP.
- Doppler flow wire is effective for evaluating cardiac assistance in DDCMP.