Electrocardiogram (ECG) Frequency Power Spectrum Analysis (Relative Power)

What This Test Measures

The test analyzes your heart’s electrical signals broken down into specific frequency bands (e.g., low, medium, high frequencies). Relative power indicates how much energy each frequency contributes to your overall heart rhythm. This can reveal subtle patterns in heart rate variability or arrhythmias that standard ECG readings might miss.

Why It’s Done

Doctors may order this test to evaluate heart rhythm disorders, such as atrial fibrillation or other arrhythmias, or to monitor long-term heart electrical stability, especially in patients with known heart disease or those undergoing cardiac monitoring.

Common Uses

Commonly used in research or specialized clinical settings to study heart rate variability, autonomic nervous system function, or to assess response to treatments affecting heart rhythm.

Sample Collection and Preparation

You’ll typically wear an ECG patch or electrodes on your chest while lying down or sitting quietly. The test may involve multiple recordings over minutes to hours, depending on the clinical need. No special preparation is usually required beyond avoiding caffeine or nicotine before the procedure.