With leaky valves I assume your mother has Aortic Regurgitation
also. In this condition depending upon severity, the lower blood pressure that is diastolic blood pressure can be even lower than 40 something closer to zero. As during relaxation phase (Diatolic) aortic valve
is open because it is leaky so what is being measured is ventricular diastolic pressure which is normally close to ten. So, please do not be surprised if that is the case. Aortic Regurgitation also leads to rise in rise in systolic pressure to rise so you need not bring in white coat hypertension
. Leave it your doctor to diagnose hypetension. If you have faith in him you will feel better and follow the doctor's advice. If you feel that you can not trust your doctor then change the doctor find someone whom you can trust. Good Luck.
If you have any more query I will be most happy to answer it.
Dr Anil Grover,
Cardiologist & Internist
M.B.;B.S, M.D. (Internal Medicine) D.M(Cardiology)