Document Detail

Effect of insulin on myocardial contractility during canine endotoxin shock.
MedLine Citation:
PMID:  3076843     Owner:  NLM     Status:  MEDLINE    
During endotoxin shock the heart becomes less responsive to the stimulatory effect of insulin on glucose uptake. In the present study we sought to determine if the heart was also less responsive to the positive inotropic effect of insulin during non-cardiogenic endotoxin shock. Responses of the heart to insulin were assessed under conditions of hyperinsulinaemic (4U.min-1), euglycaemic clamp (INS). Adult mongrel dogs, weighing 20-25 kg, were anaesthetised and instrumented to measure differences in substrate concentrations between arterial and coronary sinus blood, circumflex artery blood flow (using electromagnetic flow probe), haemodynamic variables, and left ventricular posterior wall thickness (using sonomicrometry). The first derivative of left ventricular pressure with respect to time was measured and its maximal value (LV dP/dtmax) used as an index of cardiac performance. Myocardial contractility was measured using the end systolic pressure-dimension relationship. Endotoxin shock was induced by Salmonella typhimurium (1 intravenously), and resulted in depression of myocardial performance but increased contractility. INS caused a twofold elevation in myocardial glucose uptake in control animals while in endotoxin shocked dogs it was unable to elevate glucose uptake above the pre-endotoxin level. In control animals INS caused both increased cardiac contractility and performance. In the endotoxin shock group INS was unable to increase LVdP/dtmax above the basal, pre-endotoxin level and did not cause any significant change in myocardial contractility. We suggest that the heart becomes less responsive to the positive inotropic as well as metabolic effects of insulin during endotoxin shock. Changes in LV dP/dtmax can be attributed to the changing loading conditions that occur during endotoxin shock.
W R Law; M P McLane; R M Raymond
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Cardiovascular research     Volume:  22     ISSN:  0008-6363     ISO Abbreviation:  Cardiovasc. Res.     Publication Date:  1988 Nov 
Date Detail:
Created Date:  1989-10-17     Completed Date:  1989-10-17     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0077427     Medline TA:  Cardiovasc Res     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  777-85     Citation Subset:  IM    
Department of Surgery, Loyola University, Stritch School of Medicine, Maywood, IL 60153.
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MeSH Terms
Glucose / metabolism
Insulin / pharmacology*
Myocardial Contraction / drug effects*
Myocardium / metabolism
Shock, Septic / metabolism,  physiopathology*
Stimulation, Chemical
Reg. No./Substance:
11061-68-0/Insulin; 50-99-7/Glucose

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