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Updated: Jul 20, 2026

Acute Myocardial Infarction in Rats

Acute Myocardial Infarction in Rats

Published on: February 16, 2011

Endotoxin-induced myocardial dysfunction in senescent rats.

Sandrine Rozenberg¹, Sophie Besse, Hélène Brisson

¹Université Lille 2, Laboratoire de pharmacologie, EA 1046, Centre hospitalier universitaire (CHU) de Lille, Lille, France.

Critical Care (London, England)

|September 1, 2006

Summary

Aging impairs heart function during endotoxin exposure. Senescent rats showed severe myocardial dysfunction with unaltered myofilament Ca2+ sensitivity, unlike younger rats, suggesting age-related differences in sepsis response.

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Acute Myocardial Infarction in Rats

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Published on: February 16, 2011

A Rat Model of Pressure Overload Induced Moderate Remodeling and Systolic Dysfunction as Opposed to Overt Systolic Heart Failure

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Published on: April 30, 2020

Area of Science:

Cardiovascular Physiology
Immunology
Gerontology

Background:

Aging is linked to reduced cardiac contractility and immune system changes.
Endotoxin-induced myocardial dysfunction is a critical aspect of sepsis, particularly in aging populations.

Purpose of the Study:

To investigate how aging affects endotoxin-induced myocardial dysfunction.
To compare the cardiac responses to lipopolysaccharide (LPS) in senescent versus young adult rats.

Main Methods:

Senescent (24-month) and young adult (3-month) male Wistar rats were administered LPS (0.5 or 5 mg/kg) or saline.
Cardiac contractility, myofilament Ca2+ sensitivity, nitric oxide metabolites (NOx, NO2), and oxidative stress markers were assessed 12 hours post-injection.

Main Results:

Low-dose LPS (0.5 mg/kg) caused severe myocardial dysfunction in senescent rats, comparable to high-dose LPS in young rats.
Myofilament Ca2+ sensitivity remained unchanged in senescent rats post-LPS, contrasting with young rats.
Nitric oxide metabolites increased similarly in both age groups, while oxidative stress markers were unaffected.

Conclusions:

Aging exacerbates endotoxin-induced myocardial dysfunction.
Preserved myofilament Ca2+ sensitivity in aged septic hearts may explain differing diastolic function reports.
Ca2+-sensitizing agents might be less effective in older individuals during sepsis.