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would blood pressure during heart attack

Blood pressure can go up or down, or remain normal during a cardiac event, so this is not helpful in making a diagnosis.

If a heart attack is suspected, low blood pressure could represent a serious problem because the heart is too weak to adequately maintain the pressure.

The pressure may rise due to a large release of hormones that help deal with emergency situations (such as adrenaline) and likewise, could raise the pulse, cause sweating and other symptoms

And then again, the pressure may not be affected at all.