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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Rise In The Heart Rate After Donating Blood?

Okay tuesday evening i donated blood. I passed out felt cold and tingling in mt arms and legs. I felt sick. I drank plently of fluids and ate well before giving blood. I was feeling fine hours later. Today even better. I still get a rapid heartbeat just doing simple regular things like going upstairs to do laundry or to climb out of bed or walking to mailbox or even after a bath is this normal
Wed, 26 Apr 2017
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Pulmonologist,  's  Response
Hello.
Thanks for posting here.
Donating blood causes a loss of blood volume of about 300 to 500 cc over 15 mins or so. The symptoms like passing out, tingling in limbs are not due to inadequate nutrition or so. It is due to vasovagal syncope which happens when the brain feels a loss of blood volume. It can happen in anyone.
Again since the blood volume is low, the heart tried to compensate by increasing heart rate thereby increasing blood supply to other organs. That's why you have the fast heart rate. Soon, as you start drinking fluids, your body begins to absorb fluids into blood stream to increase the blood volume and heart rate comes back to normal.
do there is nothing to worry about, just drink plenty of fluids and you will be fine.
wishing you good health
Regards.
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What Causes Rise In The Heart Rate After Donating Blood?

Hello. Thanks for posting here. Donating blood causes a loss of blood volume of about 300 to 500 cc over 15 mins or so. The symptoms like passing out, tingling in limbs are not due to inadequate nutrition or so. It is due to vasovagal syncope which happens when the brain feels a loss of blood volume. It can happen in anyone. Again since the blood volume is low, the heart tried to compensate by increasing heart rate thereby increasing blood supply to other organs. That s why you have the fast heart rate. Soon, as you start drinking fluids, your body begins to absorb fluids into blood stream to increase the blood volume and heart rate comes back to normal. do there is nothing to worry about, just drink plenty of fluids and you will be fine. wishing you good health Regards.