Intra-uterine growth retardation results in increased cardiac arrhythmias and raised diastolic blood pressure in adult rats.

Abstract:

OBJECTIVES:Epidemiological evidence in humans suggests that intrauterine growth retardation is associated with an increased risk of hypertension and coronary heart disease in later life. To begin to understand the mechanisms involved, we developed and exploited a rat model of intrauterine growth retardation to assess predisposition to arrhythmias and resting blood pressure levels at defined ages from 4 to 18 months. METHODS:Isolated working heart experiments were carried out on rats that had been subjected to intrauterine growth retardation by prenatal protein deprivation and age-matched male Wistar controls to measure susceptibility to wall stress-induced arrhythmias. In addition, resting systolic and diastolic blood pressures were measured in conscious rats via an indwelling arterial catheter. RESULTS:Hearts from intrauterine growth retarded animals showed significantly more ventricular premature beats and more episodes of ventricular tachycardia at all ages examined (4, 9 and 18 months), and at 4 and 18 months, a reduction in coronary blood flow. Diastolic pressure was significantly raised by intrauterine growth retardation in both groups examined (4 and 9 months). CONCLUSIONS:Protein malnutrition during the intrauterine period results in profound intrauterine growth retardation that is associated with a raised diastolic blood pressure and an increased predisposition to cardiac arrhythmias in later life. These results are consistent with epidemiological observations made in human populations, and as similar pathophysiological changes may operate in both situations, intrauterine protein deprivation may be a useful model to help define some of the mechanisms involved.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Hu XW,Levy A,Hart EJ,Nolan LA,Dalton GR,Levi AJ

doi

10.1016/s0008-6363(00)00167-x

subject

Has Abstract

pub_date

2000-11-01 00:00:00

pages

233-43

issue

2

eissn

0008-6363

issn

1755-3245

pii

S0008-6363(00)00167-X

journal_volume

48

pub_type

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