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[Direct revascularization of the myocardium and left ventricular diastolic function in patients with ischemic heart
Insights
Stress-Doppler echocardiography reveals that functional aortocoronary bypass grafts improve left ventricular diastolic function in ischemic heart disease patients. Non-functional grafts do not offer this benefit, highlighting the importance of graft patency.
Area of Science:
- Cardiovascular Medicine
- Diagnostic Imaging
- Cardiac Surgery
Context:
- Ischemic heart disease (IHD) management often involves direct myocardial revascularization (DMR) via aortocoronary bypass grafting.
- Assessing the long-term functional status of bypass grafts and their impact on cardiac function is crucial for patient outcomes.
- Echocardiography, particularly stress-Doppler techniques, offers non-invasive methods for evaluating cardiac performance and graft patency.
Purpose:
- To evaluate the efficacy of stress-Doppler echocardiography (echo-CG) in assessing left ventricular diastolic function following direct myocardial revascularization (DMR).
- To determine the correlation between bypass graft functionality (capable vs. occlusive shunts) and improvements in diastolic function post-DMR.
- To explore the utility of stress-Doppler echo-CG in characterizing shunt function and its temporal changes after myocardial revascularization surgery.
Summary:
- A study involving 78 ischemic heart disease patients compared echocardiography and stress-Doppler echo-CG findings before and after direct myocardial revascularization (DMR).
- Results indicated that capable bypass shunts were associated with significant improvements in left ventricular diastolic function parameters, including reduced late filling rates and shortened early filling inhibition and isovolumic relaxation times.
- Conversely, patients with occlusive shunts did not exhibit these functional improvements, suggesting that bypass graft patency is essential for enhanced diastolic function after DMR.
Impact:
- Demonstrates that improved left ventricular diastolic function after aortocoronary bypass surgery is contingent upon the patency and functionality of the bypass grafts.
- Highlights the potential of stress-Doppler echocardiography as a valuable tool for indirectly assessing bypass shunt function and its impact on cardiac hemodynamics over time.
- Provides evidence supporting the use of non-invasive stress-Doppler echo-CG for monitoring post-surgical outcomes in ischemic heart disease patients, guiding clinical management and follow-up strategies.
Abstract:
Echocardiography (echo-CG) and stress-doppler echo-CG were performed in 78 patients with ischemic heart disease (IHD) before and 1 to 8 years after the operation of direct myocardial revascularization (DMR). Polyposition coronarography with shuntography was used as a reference method. After DMR, stress-doppler echo-CG showed in capable shunts (vs resting values) that in insignificant reduction of early filling maximal rate (73.6 +/- 4.2 cm/s and 68.8 +/- 3.1 cm/s, respectively) the rate of late filling lowered significantly (64.7 +/- 4.5 cm/s and 58.1 +/- 3.9 cm/s, respectively), time of early filling inhibition (0.24 +/- 0.02 s and 0.18 +/- 0.04 s, respectively) and time of isovolumic relaxation (104.2 +/- 1.5 ms and 100.1 +/- 1.2 ms, respectively). An opposite picture was observed in patients with occlusive shunts. Thus, improvement of left ventricular diastolic function in IHD patients after aortocoronary bypass operation occurred only in capable shunts. Time course changes in the readings of stress-doppler-echoCG can indirectly characterize shunt function after DMR.