Inhibition of adrenergic neurotransmission in ischaemic regions of the canine left ventricle.

Abstract:

:To test hypothesis that adrenergic neurotransmission is impaired in acute myocardial ischaemia, we studied contractile function of normal and ischaemic myocardium after coronary artery occlusion. For each area we compared the contractile response to left sympathetic nerve stimulation (LSS) with the response to exogenous noradrenaline (NA). Contractile response was measured with intramyocardial sonomicrometers. LSS increased aortic pressure and heart rate. NA was infused to achieve an aortic pressure equivalent to LSS and simultaneous atrial pacing matched the heart rate during LSS. In normal zones both interventions produced increased shortening equivalently. In ischaemic zones systolic expansion was unchanged during LSS, while NA improved contractile function of the same zones by decreasing systolic expansion. These responses occurred during ischaemia produced by either anterior or posterior descending coronary occlusion. Changes in regional blood flow, measured by 8 microns radiolabelled microspheres, could not account for the difference between the ischaemic regional response to LSS or NA. We conclude that acute regional ischaemia impairs adrenergic nerve transmission.

journal_name

Cardiovasc Res

journal_title

Cardiovascular research

authors

Martins JB,Kerber RE,Marcus ML,Laughlin DL,Levy DM

doi

10.1093/cvr/14.2.116

subject

Has Abstract

pub_date

1980-02-01 00:00:00

pages

116-24

issue

2

eissn

0008-6363

issn

1755-3245

journal_volume

14

pub_type

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