Title

Norepinephrine concentrations in the epicardial transudate reflect early changes in adrenergic activity in the isolated perfused heart

UMMS Affiliation

Department of Physiology; Department of Medicine, Division of Cardiovascular Medicine

Date

9-1-2000

Document Type

Article

Subjects

Animals; Blood Pressure; Cardiomegaly; Heart; Male; Myocardial Reperfusion; Norepinephrine; Pericardium; Rats; Rats, Sprague-Dawley; Receptors, Adrenergic

Disciplines

Physiology

Abstract

The aim of this study was to establish whether epicardial transudates could be used to uncover small, but physiologically important changes in interstitial NE concentrations under normal and pathological conditions. Norepinephrine (NE) concentrations measured in epicardial transudate fluid were compared to NE levels in the coronary effluent in normal and pressure overload hypertrophied (POH) rat hearts. Hearts were isolated together with the stellate ganglion and perfused in the inverted position. Epicardial surface transudates, representative fluid of the interstitial myocardial compartment, and coronary effluents were collected for determination of NE levels in the presence and absence of stellate ganglion stimulation. The same protocol was repeated in the presence and absence of nisoxetine, a NE uptake blocker. NE concentrations in epicardial transudates were 16- and 19-fold higher than in the coronary effluent in both sham and POH groups, respectively. NE concentrations in the transudates but not in the coronary effluents were significantly higher (1.6-fold) in hearts with POH when compared to normal hearts. Likewise, nisoxetine (10(-5)m) increased (1.3-fold) NE concentrations in the transudates but not in the effluents of sham animals. As expected, stellate ganglion stimulation increased NE concentrations in both transudates and effluents in sham and POH hearts. In conclusion, determination of NE concentrations in epicardial transudates represents a simple, rapid and sensitive method to detect increases in adrenergic activity in normal and abnormal hearts.

Rights and Permissions

Citation: J Mol Cell Cardiol. 2000 Sep;32(9):1695-701. Link to article on publisher's site

Related Resources

Link to article in PubMed

PubMed ID

10966832