Capillary Blood Pressure in Man. Direct Measurements in the Digits During Induced Vasoconstriction 1

Capillary blood pressure in man. Direct measurements in the digits of normal and hypertensive subjects during vasoconstriction and vasodilatation variously induced

“…Another study (8) showed that neurogenic digital vasoconstrictions were accompanied by decreases in digital capillary blood pressure, which in 4 hypertensive patients were of approximately the same duration and magnitude as in 3 normal subjects ( Figure 1). Neither reflex vasodilatation nor the local hyperemia induced by the intradermal injection of histamine acid phosphate (1: 100 in salt solution) prevented these falls in capillary blood pressure in normal or hypertensive subjects (8 patients with essential hypertension, and in one patient with acute nephritis.…”

“…All of the methods, conditions, and precautions, fully described in a previous communication (8) under the general category of methods, were rigidly maintained in the present study. This pertained to equipment, surroundings, and subjects.…”

Capillary Blood Pressure in Man. Direct Measurements in the Digits During Arterial Hypertension Induced by Paredrinol Sulfate 1

“…As in previous studies (1,2,3), all determinations of capillary blood pressure were made on capillaries in the nail-folds of the fingers. The direct microinjection method (Landis) (4), modified as previously described (2), was employed.…”

“…The direct microinjection method (Landis) (4), modified as previously described (2), was employed. The general methods, conditions, and precautions employed were fully described in a previous communication (2). Particular.…”

“…Both levels of arterial pressure were obtained during a single observation period, throughout which the digital skin temperature was maintained constantly at levels of moderate digital vasodilatation (2 Smithwick (7,8).…”