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[Analysis of some exercise test parameters in patients 12 months after myocardial infarction]
S P Lewek1, J Kowalski, M Cholewa
1Kliniki Chorób Płuc Instytutu Medycyny Wewnetrznej WAM w Lodzi.
Insights
Patients who experienced non-ST-elevation myocardial infarction (NSTEMI) showed the lowest exercise tolerance. Coronary efficiency was poorest in patients following inferior and NSTEMI heart attacks.
Area of Science:
- Cardiology
- Exercise Physiology
Background:
- Myocardial infarction (MI) is a leading cause of mortality worldwide.
- Different types of MI may impact long-term patient outcomes and exercise capacity differently.
- Assessing exercise tolerance is crucial for cardiac rehabilitation and prognosis.
Purpose of the Study:
- To compare exercise tolerance and coronary efficiency in patients following different types of myocardial infarction.
- To identify potential differences in functional capacity based on infarction location and ECG presentation.
Main Methods:
- 102 patients (mean age 57 years) post-MI were divided into three groups: anterior infarction, inferior infarction, and subendocardial (non-Q wave) infarction.
- Maximal exercise tests were conducted using a Medicor ergometer until symptom limitation or 85% of age-predicted heart rate.
- Evaluated parameters included effort tolerance, load capacity, ST-segment depression on ECG, and type of exertional chest pain.
Main Results:
- Patients with non-Q wave (subendocardial) infarction exhibited the minimal tolerance to exercise.
- Coronary efficiency was found to be significantly worse in patients who had experienced inferior or non-Q wave myocardial infarction compared to anterior infarction.
Conclusions:
- Non-Q wave myocardial infarction is associated with the lowest exercise capacity.
- Inferior and non-Q wave MIs result in poorer coronary efficiency, suggesting a potentially more compromised cardiac function post-event.
Abstract:
This study comprised 102 patients (70 men--32 women) in mean age 57 +/- 7.8 year after noncomplicated myocardial infarction. Thirty five patients were after anterior infarction (group I), 36 after inferior infarction (group II) and 31 after subendocardial infarction (non Q wave) (group III). Exercise tests were performed always in morning, on ergometer Medicor. This study was continued until restriction symptoms appeared or until the limit of 85% of the pulse rate adequate to the age. Assessment of effort and load tolerance as well as ST segment depression on ECG and the kind of effort pain, was performed. The minimal tolerance of effort in patients after non Q infarction has been found. Coronary efficiency was the worst in patients after inferior and non Q myocardial infarction.