Heart rate variability in human immunodeficiency virus-positive individuals

Area of Science:

• Cardiology
• Immunology
• Autonomic Neuroscience

Background:

• Heart rate variability (HRV) reflects cardiac autonomic tone.
• Previous studies indicated depressed HRV in patients with Acquired Immunodeficiency Syndrome (AIDS).
• The current study investigated HRV in human immunodeficiency virus (HIV)-positive individuals without AIDS.

Purpose of the Study:

• To determine if HRV is depressed in HIV-positive individuals without AIDS.
• To assess HRV as a potential early marker of autonomic dysfunction in HIV infection.

Main Methods:

• Prospective study involving spectral analysis of short-term electrocardiography (ECG) monitoring.
• 21 HIV-positive individuals (without AIDS or clinical autonomic dysfunction) and 18 healthy volunteers were studied.
• Echocardiography was performed in HIV-positive individuals to exclude left ventricular systolic dysfunction.

Main Results:

• A significant reduction in total HRV power was observed in HIV-positive individuals compared to controls (p<0.00001).
• All measured components of HRV were found to be reduced in the HIV-positive group.
• Mean CD4+ lymphocyte count was 426+/-166/mm(3) and ejection fraction was 62.4+/-6.4% in HIV patients.

Conclusions:

• HRV is significantly reduced in early-stage HIV infection, even without clinical autonomic dysfunction.
• This reduction in HRV may serve as an early indicator of developing sympatho-vagal imbalance.
• HRV assessment could be a valuable tool for monitoring autonomic health in HIV-positive individuals.