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The primary purpose of a Holter monitor is to record a continuous electrocardiogram (ECG) over a period of 24 to 48 hours. This extended monitoring allows healthcare providers to capture sporadic or intermittent cardiac events that may not be detected during a standard resting ECG conducted in a clinical setting. By continuously recording the electrical activity of the heart during the patient's normal daily activities, the Holter monitor helps in diagnosing various arrhythmias, palpitations, and other heart-related issues that may occur during normal life but not during a brief examination.

The other choices relate to different medical monitoring and assessment techniques. Monitoring blood pressure fluctuations is done using a blood pressure monitor, which evaluates cardiovascular health but does not provide specific information about the electrical activity of the heart. Assessing cardiac stress response during exercise is typically performed using a cardiopulmonary exercise test or a stress test, which focuses on how the heart responds to exertion rather than long-term rhythm changes. Evaluating lipid profiles involves analyzing blood samples to determine levels of cholesterol and triglycerides, which are crucial for assessing the risk of heart disease but do not relate to the monitoring of electrical activity in the heart.