What is cause of diastolic bp even heard at 10mmhg (using steth) with or without using bp apparatus?

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The palpatory method would be very useful where frequent blood pressure measurement are being done manually like in wards, in busy OPD, patient on treadmill and also whenever stethoscope is not available. The blood pressure can be measured in noisy environment too Example :  Inflate the cuff rapidly to 70 mmHg, and increase by 10 mm Hg increments while palpating the radial pulse. Note the level of pressure at which the pulse disappears and subsequently reappears during deflation will be systolic blood pressure.
Causes are Raynauld disease Venous wall defect Auto immune disease etv
Causes of diastolic bp are Raynaud's disease buergurs disease or venous wall defect