What diseases can Holter monitoring detect?

Ambulatory electrocardiography (ECG) is a method that continuously records and analyzes ECG changes over an extended period while the patient is engaged in daily activities and at rest. It includes ST-segment trend analysis, heart rate variability assessment, post-exertion data, and differential diagnosis of various arrhythmias. So, what diseases can ambulatory ECG detect? Below is an explanation.

What Diseases Can Ambulatory ECG Detect?

Ambulatory ECG can detect arrhythmias such as atrial fibrillation, paroxysmal supraventricular tachycardia, ventricular premature beats, atrial premature beats, sinus arrest, and atrioventricular conduction block. It can also identify myocardial ischemic conditions—including stable angina pectoris, unstable angina pectoris, mixed-type angina, and worsening effort-induced angina—and may even help localize the affected coronary artery based on ambulatory ECG findings. Furthermore, it holds significant clinical value for prognostic evaluation in cardiac patients and for assessing functional capacity in daily life, thereby guiding decisions regarding further diagnostic testing and therapeutic interventions.

Knowledge Extension: Clinical Significance of Ambulatory ECG

1. Ambulatory ECG records the patient’s ECG waveform continuously over 24 hours, whereas standard ECG captures only a brief segment—typically two to three minutes—using surface electrodes. Some patients exhibit abnormal ECG patterns only intermittently; thus, routine ECG may fail to reveal abnormalities, whereas ambulatory ECG can uncover subtle or intermittent cardiac abnormalities. Consequently, ambulatory ECG serves as a highly reliable tool for diagnosing cardiac disorders.

2. For patients presenting with unexplained palpitations or dizziness, continuous ECG monitoring helps determine whether symptoms correlate with heart rate fluctuations, arrhythmias, or conduction disturbances. It also enables objective evaluation of drug efficacy by comparing pre- and post-treatment ECG recordings in patients receiving specific pharmacotherapies. Moreover, in asymptomatic patients with ischemic heart disease, ambulatory ECG provides valuable adjunctive diagnostic information.

The above outlines the diseases detectable by ambulatory ECG. We hope this information proves helpful to you.