A Holter test, also known as Holter monitoring, is a non-invasive diagnostic procedure that continuously records the electrical activity of your heart, usually for 24 to 48 hours. Unlike a standard ECG (electrocardiogram), which records heart rhythms for just a few seconds, the Holter test captures data over a longer period, making it more effective in identifying irregularities that occur intermittently—such as arrhythmias, palpitations, or silent heart issues.
During the test, small electrode patches are attached to your chest and connected to a lightweight, battery-powered device worn on your belt or shoulder. Patients are advised to go about their daily activities normally, while also keeping a diary of any symptoms (e.g., dizziness, chest pain, shortness of breath) they experience. The recorded data is later analyzed by a cardiologist to evaluate your heart’s rhythm and detect abnormalities that could indicate underlying conditions.
The Holter test is safe, painless, and essential for diagnosing heart rhythm disorders, assessing treatment effectiveness, or guiding further medical decisions.