Diurnal variation in blood pressure and arterial stiffness in chronic kidney disease: the role of endothelin-1

What Was Tested

This observational study looks at Endothelin-1 in the context of low blood pressure and orthostatic hypotension.

Hypertension and arterial stiffness are important independent cardiovascular risk factors in chronic kidney disease (CKD) to which endothelin-1 (ET-1) contributes.

The researchers examined the 24-hour variation of BP, arterial stiffness, and the ET system in healthy volunteers and patients with CKD and the effects on these of ET receptor type A receptor antagonism (sitaxentan).

Who Took Part

The study group was 15 patients.

PubMed indexes the participants as adults and middle-aged adults, both men and women.

How the Study Was Run

The design is described as randomized, double-blind, placebo-controlled and crossover.

Random assignment meant chance, not the researchers, decided who got Endothelin-1 and who got the comparison, which limits bias.

As a double-blind Endothelin-1 study, the assignments were hidden from both participants and investigators until the end.

Some patients received a placebo instead of Endothelin-1, giving a reference point.

In the crossover set-up each of the patients took both Endothelin-1 and the comparison in turn, acting as their own control.

What Was Measured

PubMed files the paper under topics including Blood Pressure, Case-Control Studies, Circadian Rhythm, Endothelin Receptor Antagonists, Endothelin-1, Isoxazoles and Renal Insufficiency, Chronic.

What This Means in Plain Language

The paper is a randomized, double-blind and placebo-controlled study of Endothelin-1 in 15 patients in people with low blood pressure and orthostatic hypotension.

With fewer than 40 people, it is a small study, so it is better read as an early signal for further research than as a settled answer.

The publication is from 2014 (Hypertension (Dallas, Tex. : 1979)), a journal based in United States.

More context: the Endothelin-1 compound page, Low blood pressure and orthostatic hypotension research.