My sister systolic blood pressure is 200 diastolic...

How to treat severe hypertension

in case of presence of severe hypertension then it should be treated in the hospital where some drugs can be given intravenously like  furosemide and if no response the nitroglycerine or sodium nitroprusside can be given and after blood pressure control then the patient should take 2 oral antihypertensive treatments like  for example ramipril and hydrochlorothiazie  and should reduce salt in food

How to diagnose severe hypertension

the blood pressure should be measured by the physician in the hospital to make sure of the readings investigations to try to find the cause of hypertension can be done loke abdominal ultrasound to exclude the presence of renal artery stenosis  and if there is big difference between systoloc and diastolic readings then you should do echocardiography to exclude the presence of aortic valve regurgitation

what are the causes severe hypertension

renal artery stenosis
cushing syndrome
eating alot of salty food

advice

you should go to hospital to provide the treatment and do the investigations