Hi Thank you for asking HCM I have gone through your query. Blood pressure is measured by instrument called sphigmomanometer. First a cuff has to be tied and inflated to a pressure till the blood flow completely interrupted. Then put a stethoscope on brachial artery and listen while slowly loosening the cuff pressure. The first heard sound is systolic blood pressure and last heard sound is the diastolic level. Seizure is build up of abnormal electrical activity in brain. Thanks.