Document Detail


The correlation of cardiac mass with arterial haemodynamics of resistive and capacitive load in rats with normotension and established hypertension.
MedLine Citation:
PMID:  7838675     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
In hypertensive animals and humans, cardiac hypertrophy may occur as a consequence of an external load on the heart. Several studies have suggested that the non-pulsatile components of arterial haemodynamics, such as arterial pressure and vascular resistance, do not adequately represent the ventricular afterload and are not well correlated with the degree of cardiac hypertrophy (CH). The present study was undertaken to analyse the correlation between the degree of CH and various haemodynamic parameters in the spontaneously hypertensive rat (SHR) with established hypertension. A total of 36 SHRs (6-8 months) with a tail-cuff pressure above 190 mm Hg were used. Control data were obtained from 32 age-matched normotensive Wistar Kyoto rats (WKY). Animals were anaesthetized with pentobarbitone sodium (40 mg/kg i.p.) and artificially ventilated with a respirator. A Millar catheter with a high-fidelity pressure sensor was used to record the aortic pressure and an electromagnetic flow transducer to monitor the aortic flow. The pressure and flow signals were subjected to Fourier transformation for the analysis of the arterial impedance spectrum. The left ventricular weight-to-body weight ratio (LVW/BW) was taken as a measure of the degree of CH. The measured haemodynamic parameters in these anaesthetized, open-chest SHRs were systolic pressure (SP) (mean +/- SE) 172 +/- 4 mm Hg, diastolic pressure (DP), 120 +/- 3 mm Hg, pulse pressure (PP) 52 +/- 2 mm Hg, peripheral resistance (Rp) 344,032 +/- 8,012 dyne.s.cm-5, characteristic impedance (Zc) 6,442 +/- 313 dyne.s.cm-5, the impedance modulus at the first harmonic (Z1) 26,611 +/- 1,061 dyne.s.cm-5, mean arterial compliance (Cm) 0.87 +/- 0.04 microliter/mm Hg and LVW/BW 3.092 +/- 0.026 mg/g.(ABSTRACT TRUNCATED AT 250 WORDS)
Authors:
C T Hu; K C Chang; T S Kuo; H I Chen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Pflügers Archiv : European journal of physiology     Volume:  428     ISSN:  0031-6768     ISO Abbreviation:  Pflugers Arch.     Publication Date:  1994 Oct 
Date Detail:
Created Date:  1995-03-02     Completed Date:  1995-03-02     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0154720     Medline TA:  Pflugers Arch     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  533-41     Citation Subset:  IM; S    
Affiliation:
Department and Institute of Electrical Engineering, National Taiwan University, Taipei, Republic of China.
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MeSH Terms
Descriptor/Qualifier:
Animals
Cardiomegaly / etiology,  pathology*,  physiopathology
Heart / anatomy & histology*,  physiology
Heart Ventricles
Hypertension / complications,  pathology*,  physiopathology
Rats
Rats, Inbred SHR
Rats, Inbred WKY
Vascular Resistance

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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