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Early heart rate variability alterations after acute myocardial infarction
M H Luria1, D Sapoznikov, D Gilon
1Department of Cardiology, Hadassah University Hospital, Jerusalem, Israel.
American Heart Journal
|March 1, 1993
Summary
Early heart rate variability (HRV) changes in acute myocardial infarction patients indicate autonomic nervous system imbalance. Reduced HRV was observed within 24 hours post-thrombolytic therapy, particularly in anterior infarction cases.
Area of Science:
- Cardiology
- Autonomic Nervous System Research
Background:
- Acute myocardial infarction (AMI) significantly impacts cardiac autonomic function.
- Early assessment of autonomic nervous system (ANS) activity is crucial for managing AMI patients.
Purpose of the Study:
- To evaluate early changes in heart rate variability (HRV) in patients with AMI.
- To investigate the relationship between HRV alterations and infarction location (anterior vs. inferior).
Main Methods:
- Studied 81 AMI patients within 24 hours of thrombolytic therapy.
- Utilized 24-hour ECG Holter recordings to assess time-domain (standard deviation of mean heart rate) and frequency-domain (low, mid, high-frequency band power) HRV.
- Compared HRV parameters with 41 healthy subjects.
Main Results:
- AMI patients exhibited significantly diminished HRV (time and frequency domains) compared to controls (p < 0.01).
- Anterior infarction patients showed higher heart rates and lower HRV than inferior infarction patients (p < 0.01).
- Significant HRV reduction, especially in the high-frequency band, was noted within 8 hours in anterior infarction, correlating with ST-segment changes.
Conclusions:
- Early post-AMI, HRV reduction suggests sympathovagal imbalance.
- HRV alterations are location-dependent and indicative of intense autonomic nervous system activity.
- These findings highlight the prognostic significance of early HRV assessment in AMI.