Definition of hypertension and measurement of blood pressure

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					Appendix (E) A-1

Definition of hypertension and measurement of blood pressure

       Hypertension was defined if systolic pressure was more than or equal to 140

mmHg and/or diastolic pressure more than or equal to 90 mmHg. Blood pressure was

measured using a standard mercury sphygmomanometer. All measurements were

obtained in a quiet room. Subjects were rested adequately before measurements were

taken, with the subject seated and the arm supported by a table at heart level. A cuff

of suitable size was applied, about 3 cm above the cubital fossa, on the exposed upper

arm of the subject. The cuff was inflated until the sphygmomanometer reading was 30

mmHg above the level at which the radial pulse disappeared, and then slowly

deflated. During this time, the Korotkoff sounds were checked with the bell of the

stethoscope placed over the brachial artery. The pressure at which the sounds were

first heard was the systolic blood pressure. The disappearance of phase V Korotkoff

sounds was used to measure the diastolic pressure. We took the mean of at least two

readings for each visit, and these readings were taken separately with an interval of at

least 3 minutes. These blood pressure measurements were carried out over 2 to 3

visits over a period of 2 to 3 months as widely recommended for the diagnosis of


Collection and validation of clinical information

       We analyzed the following data of the HFS patients: age, gender, duration and

severity of HFS, side of HFS and duration of hypertension. The history of the duration

of hemifacial spasm and a prior history of hypertension was ascertained from the

patients, and corroborated by their family members, and/or their family physicians.

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