Final answer:
Patients should record activities like bike riding, driving, and changes in sleeping positions in their Holter monitor diary but should avoid swimming while wearing the monitor. The correct option is 2.
Step-by-step explanation:
An EKG technician should instruct a patient to record any significant activities or events in their Holter monitor diary that could influence the heart's electrical activity. Such activities typically include bike riding and driving, which could alter the heart rate or rhythm.
Additionally, noting sleeping positions can provide insight into how posture affects the heart during rest. It's important not to include swimming, as Holter monitors cannot be submerged in water.
Patients should record these events as they occur, so any anomalies in the ECG readings can be correlated with specific activities, providing a comprehensive overview of heart health in everyday life.