Heart rate monitors and abnormal heart rhythm detection

Area of Science:

• Biomedical Engineering
• Cardiovascular Technology
• Wearable Health Devices

Background:

• Assessing the accuracy of modern heart rate monitors (HRMs) is crucial for reliable physiological data collection.
• Comparing third-generation HRMs (Accurex Plus, Vantage NV) against an older model (PE 4000) provides insight into technological advancements.
• Investigating HRM responses to abnormal heart rhythms is essential for understanding their limitations in clinical settings.

Observation:

• Laboratory testing involved stable and transient heart rate simulations using the Phantom 320 HR simulator.
• Abnormal heart rhythms were simulated using an automatic arrhythmia program to assess HRM performance.
• Accuracy was evaluated under stable conditions (7 rates, 3 min each) and transient conditions (17 min arrhythmia program).

Findings:

• Third-generation HRMs (Accurex Plus, Vantage NV) demonstrated superior accuracy (89-94% and >98% at +/-3 bpm) in stable conditions compared to the PE 4000.
• All HRMs exhibited a smoothing effect during transient measurements, more pronounced during decelerating heart rates.
• Most isolated arrhythmias (e.g., pauses < 4s, SVEA, SVT) were undetected or rejected; signal changes like QRS variations caused detection losses.

Implications:

• While newer HRMs offer enhanced accuracy for regular heart rates, their effectiveness in detecting diverse arrhythmias remains limited.
• Significant arrhythmias like pauses >4s, bradycardia, or tachycardia may still be detectable by HRMs, offering some clinical value.
• The study highlights the need for HRMs with improved algorithms to accurately capture and interpret complex cardiac events.