The Influence of Heart Rate on Peripheral Vascular Function Among Pacemaker Patients

Area of Science:

• Cardiovascular Physiology
• Biomedical Engineering
• Vascular Health Assessment

Background:

• Finger photoplethysmography fitness index (PPGF) is linked to heart rate (HR) variability.
• The effect of acute HR changes on resting PPGF, a local blood flow indicator, is not well understood.

Purpose of the Study:

• To investigate the influence of acute heart rate changes on resting finger photoplethysmography fitness index (PPGF).

Main Methods:

• 22 pacemaker recipients underwent controlled assessments of demographics, BP, blood analysis, PPGF, and vascular functions.
• HR was increased progressively from 70 to 90 bpm with 20-minute rest periods.
• HR, PPGF, and BP were recorded at each pacing level.

Main Results:

• Systolic and diastolic blood pressure increased with rising HR.
• PPGF remained stable across all tested HR levels (70, 80, and 90 bpm; p > 0.05).
• Resting PPGF demonstrated independence from acute HR fluctuations.

Conclusions:

• PPGF accurately reflects local blood flow and is unaffected by short-term HR variations.
• PPGF is a dependable marker for vascular health and age assessment, even in individuals with fluctuating HR.
• Further research is needed to explore PPGF's applicability in younger, healthier populations.