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Giddiness at night

My father has a problem of being short of breath and giddiness at night time. He doesnt recollect why he fell down. This happens only at night time. he is a pacemaker patient and initially the problem used to be there in the morning as well. but then when we checked pacemaker and corrected it.. it was fine. Then it again started but only at night.. Pacemaker seems to be fine now but the issue has not been resolved for night time. Please suggest whom should we consult.?
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Doctor Answers (1) on Giddiness at night

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Dr. Chethan R S Bangalore | General Physician
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Hi....., Electrical conduction disturbances make the heart beat too quickly known as tachycardia or too slowly known as bradycardia, and either of these situations may result in an inadequate blood supply to the brain, causing dizziness or lightheadedness..... If the flow to the brain is lower than usual or if the blood pressure is low, you may feel dizzy.....Consult your cardiologist....
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