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[Early diastolic changes in patients with unstable angina pectoris]
Vutreshni Bolesti
|January 1, 1987
Summary
Unstable angina patients showed prolonged early diastole relaxation periods, which improved with medication. Treatment normalized these intervals, suggesting reduced left ventricular filling restrictions due to myocardial ischemia.
Area of Science:
- Cardiology
- Cardiovascular Physiology
Background:
- Unstable angina pectoris (UAP) is a critical condition characterized by myocardial ischemia.
- Diastolic dysfunction, particularly impaired left ventricular (LV) relaxation, is a key feature of ischemic heart disease.
Purpose of the Study:
- To investigate the impact of unstable angina on early diastolic time intervals.
- To evaluate the effects of medical treatment on these diastolic parameters in UAP patients.
Main Methods:
- Simultaneous M-type echocardiogram, ballistocardiogram (BCG), phonocardiogram (PCG), and electrocardiogram (ECG) recordings were used.
- The Alvares and Goodwin method was applied to analyze diastolic time intervals.
- A control group of 33 healthy men was included for comparison.
Main Results:
- Patients with UAP exhibited significantly prolonged isovolumetric relaxation periods (IVRP) and shortened active aspiration periods (p < 0.001) compared to controls.
- Following medical treatment (beta-blockers, long-acting nitrites, calcium antagonists), IVRP shortened (p < 0.001) and active aspiration lengthened (p < 0.01), without altering the total rapid filling period.
- Slow relaxation and total rapid filling periods remained unchanged and did not differ from the control group.
Conclusions:
- The observed changes in diastolic time intervals are likely linked to reduced myocardial compliance caused by ischemia.
- Dynamic improvements in diastolic function during treatment indicate a lessening of LV filling restrictions in UAP.