الفهرس 
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Abstract
Cardiac rehabilitation is a medically supervised program designed to improve cardiovascular outcomes after MI, heart failure, angioplasty, or heart surgery. It is a complex intervention that involves a variety of therapies, including supervised exercise training, health education and risk factor modification, behavior change, social and psychological support.
Cardiac rehabilitation is a class I recommendation in most of the current guidelines of cardiovascular societies worldwide.
Aim of the work is to study the correlation between heart rate recovery & global longitudinal strain in heart failure patients subjected to cardiac rehabilitation.
This study was conducted in the cardiac rehabilitation (CR) unit in the cardiology department of Ain Shams University hospital between December 2019 and December 2020 to investigate the correlation between heart rate recovery & global longitudinal strain in heart failure patients subjected to cardiac rehabilitation.
The study included 50 adult ischemic cardiomyopathy patients on optimal medical therapy. Modified Bruce symptom-limited exercise test was done to each patient before CR then CR program for three months two times per week 30 minutes each; then, modified Bruce exercise test was done after completion of the CR program. The procedures were explained to the patients and informed written consent was obtained. In order not to affect the results of the study, patients on beta-blockers or other heart rate-reducing drugs continued using the same doses during the study period. We measured HRR, HR reserve, METS and GLS before and after cardiac rehabilitation program.
In the present study, the mean HRR1 in heart failure patients after the CR program increased significantly from 18.4±3 to 27.7±5.6 bpm (p < 0.0001). The present study also showed an increase in the mean HRR2 after the CR program (from 32.1 ± 3.6 to 42.1 ±5.6 bpm (p < 0.0001).
Regarding HR reserve the present study showed a significant increase in HR reserve after CR (from 51.11±7.74 to 69±8.8, p 0.001).
Regarding GLS, the present study shows a significant improvement in GLS after 12-week cardiac rehabilitation from 9.4±1.5 to 11.4±1.5. (p-value < 0.0001).
In our knowledge, our study is the first study that investigated the correlation between HRR and GLS in ischemic heart failure patients subjected to cardiac rehabilitation. We found that there is significant correlation between improvement in HRR and GLS after CR program.