Ambulatory electrocardiographic (ECG) monitoring is used to help medical professionals diagnose intermittent cardiac arrhythmias that occur only infrequently and unpredictably. Arrhythmias often produce sudden symptoms, but typically are no longer present by the time a person gets to a healthcare provider. Ambulatory ECG monitoring can be employed to record your heart rhythm for much longer periods of time—days, weeks, or even months—to greatly increase the odds of capturing and recording this kind of brief, intermittent, but potentially significant arrhythmia.