Don't worry: The cause is likely that he's 75 and has stiff arteries. Alternatively, he may have aortic regurgitation. The low diastolic BP is an artifact. If you placed a catheter in his his aorta, the true measure of central BP, it would be higher. His true diastolic BP is, no doubt low, but not that low. If he's feeling okay, don't sweat it.
Answered 7/24/2014
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