Comparison between heart rate variability and recovery in ischemic patients

Area of Science:

• Cardiology
• Autonomic Nervous System Function

Background:

• Heart rate variability (HRV) and heart rate recovery (HRR) reflect autonomic balance.
• Low values of HRV and HRR indicate poor prognosis, particularly in ischemic heart disease.
• Assessing the relationship between HRR and HRV is crucial for understanding their prognostic significance in ischemic patients.

Purpose of the Study:

• To determine the correlation between HRR and HRV in patients with ischemic heart disease.
• To investigate the interchangeability of HRR and HRV as indicators of autonomic function.
• To evaluate the sensitivity of HRR and HRV in detecting increased sympathetic drive.

Main Methods:

• Sixty-three patients with ischemic heart disease underwent exercise stress testing for HRR calculation.
• HRR was defined as the difference between peak heart rate and heart rate one minute post-exercise.
• Time-domain HRV parameters (SDNN, SDANN, RMSSD) were calculated from 24-hour Holter ECG monitoring.

Main Results:

• No significant correlation was found between HRR and HRV parameters (p > 0.05).
• Mean HRR did not differ significantly between subjects with normal or abnormal HRV values (p > 0.05).
• A high prevalence of low HRV (68.3%) was observed, while abnormal HRR was less common (6%).

Conclusions:

• HRR cannot predict HRV values in ischemic heart disease patients.
• HRV parameters are more sensitive than HRR in identifying increased sympathetic drive.
• HRV provides a more comprehensive assessment of autonomic dysfunction in this population.