Effect of the final coronary arterial diameter after coronary angioplasty on heart rate variability responses

Area of Science:

• Cardiology
• Autonomic Nervous System Function
• Interventional Cardiology

Background:

• Autonomic nervous system dysfunction and reduced heart rate variability (HRV) are observed post-percutaneous transluminal coronary angioplasty (PTCA).
• Factors contributing to reduced HRV after PTCA remain unclear.
• This study investigates the link between HRV indices and final coronary arterial luminal diameter post-PTCA.

Purpose of the Study:

• To assess the relationship between heart rate variability (HRV) indices and the final coronary arterial luminal diameter after percutaneous transluminal coronary angioplasty (PTCA).
• To identify factors associated with reduced HRV following PTCA in patients with coronary artery disease.

Main Methods:

• Twenty-seven patients with single-vessel disease underwent PTCA.
• Frequency-domain analysis of HRV (Low-frequency power, High-frequency power, Total power) was performed 24 hours before, and 24 hours, 10 days, and 30 days after PTCA.
• Patients were stratified by PTCA restenosis risk score, degree of dilatation, and revascularization status.

Main Results:

• Seventy-six percent of patients exhibited reduced HRV post-PTCA.
• HRV reduction correlated significantly with PTCA restenosis risk score and degree of revascularization (r = 0.48, P < 0.01 and r = 0.50, P < 0.008).
• HRV reduction was more pronounced in patients with prior myocardial infarction and recovered by day 10.

Conclusions:

• A transient, parasympathetically modulated HRV reduction occurs post-PTCA in single-vessel disease patients.
• HRV reduction is associated with PTCA restenosis risk score and revascularization degree, suggesting a link to reperfusion injury.
• HRV demonstrates rapid recovery, indicating a temporary impact of angioplasty on autonomic function.