Blood antidiuretic activity and selected haemodynamic indicators in patients with essential hypertension.

In patients with essential hypertension the blood antidiuretic activity was studied in relation to the haemodynamics. It was found that the blood antidiuretic activity increased in parallel with the rise in the total peripheral resistance, and with the decreases in the blood and plasma volumes, stroke volume, and end-diastolic heart volume. The role of antidiuretic hormone in the regulation of haemodynamics in hypertensive patients is discussed.