Abstract
Background: Hypertension is one of the leading causes of cardiovascular death and is primarily silent as there is hardly any symptom before target organ damage. Heredity and autonomic nervous system play pivotal roles in pathogenesis of essential hypertension. Aims: To detect early cardiovascular autonomic changes by heart rate variability (HRV) before overt hypertension, among the offspring having family history of essential hypertension. Materials and Methods: 34 normotensive offspring aged 19-24 years with parental history of essential hypertension were included as study group and the control group included 32 age, sex, and body mass index (BMI) matched normotensive offspring having normotensive parents. Resting pulse, blood pressure, and short-term supine HRV was recorded initially followed by standing HRV. Results: A statistically significant increase in resting diastolic blood pressure in study group indicated increased sympathetic tone. Postural stress in the study group revealed a greater increase (P
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