Ask the doctor: Can a pacemaker cause dizzy spells?
Ask the doctor
If I had a patient like your father, I would want to get blood pressure readings when he is having these dizzy spells. One way to do this would be to measure his blood pressure in the office while he's seated, then ask him to stand up quickly and immediately measure his blood pressure again. If there's a sudden drop in blood pressure, the next step would be to run various tests to find out what is causing your father's heart to work less efficiently when he stands up.
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