Relation of left ventricular hypertrophy, afterload, and contractility to left ventricular performance in Goldblatt hypertension.

Abstract:

:To analyze the determinants of left ventricular (LV) performance (myocardial afterload, chamber size, mass, and contractility) in Goldblatt hypertension, 19 anesthetized one-kidney, one-clip (1K1C) and 28 two-kidney, one-clip (2K1C) male Wistar rats were studied 58 to 62 days after clipping, together with 19 sham-operated and 13 normal rats (controls), by M-mode echocardiography using necropsy-validated methods of measurement. The LV fractional shortening was inversely related to end-systolic stress in all groups (r = -0.89 to -0.95, all P less than .00001): 7 2K1C (25%) and 9 1K1C (47%) had fractional shortening above the upper confidence limit in control animals. Both 1K1C and 2K1C with high LV performance had severe hypertension, inadequate LV hypertrophy, with resultant high wall stress (both P less than .005), increased LV chamber dimension (P less than .005 and P less than .05, respectively) and high afterload-corrected fractional shortening (both P less than .001); 2K1C also had high plasma renin activity and atrial natriuretic factor levels (both P less than .01). Rats with normal LV performance exhibited mild hypertension, adequate LV hypertrophy (normalizing wall stress), and normal LV chamber size and afterload-corrected fractional shortening. Thus, 8 1/2 weeks after clipping, adequate LV hypertrophy allows maintenance of normal LV function by normalizing myocardial afterload in a majority of rats with Goldblatt hypertension, whereas increased LV contractility (and possibly use of preload reserve in 1K1C) maintains normal LV function in the presence of inadequate LV hypertrophy and elevated wall stress, in a substantial minority of rats that developed more severe Goldblatt hypertension.

journal_name

Am J Hypertens

authors

de Simone G,Devereux RB,Volpe M,Camargo MJ,Wallerson DC,Laragh JH

doi

10.1093/ajh/5.5.292

subject

Has Abstract

pub_date

1992-05-01 00:00:00

pages

292-301

issue

5 Pt 1

eissn

0895-7061

issn

1941-7225

journal_volume

5

pub_type

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