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Left ventricular haemodynamics in murine viral myocarditis
M Herzum1, P Mahr, F Wietrzychowski
1Philipps University, Department of Internal Medicine, Marburg, Germany.
European Heart Journal
|December 1, 1995
Summary
Coxsackievirus B3 infection causes severe myocarditis in mice. Left ventricular function declines significantly after day 5, suggesting virus-mediated damage or immune response impairs heart function.
Area of Science:
- Cardiology
- Virology
- Immunology
Background:
- Coxsackievirus B3 (CVB3) infection in DBA/2 mice causes severe myocarditis.
- A temporal discrepancy exists between peak viral replication and maximal cardiac inflammation.
Purpose of the Study:
- To investigate hemodynamic changes in CVB3-induced murine myocarditis.
- To determine the timeline of these hemodynamic alterations during infection.
Main Methods:
- Left ventricular pressure and dp/dt measurements were taken via left ventricle puncture.
- Histopathological analysis using Hematoxylin-eosin staining assessed inflammatory lesions.
- Plaque-forming assays determined viral titers in cardiac tissue.
Main Results:
- Viral concentrations peaked on day 3 post-infection.
- Maximal cardiac inflammation was observed on day 7.
- Left ventricular function remained preserved until day 5, then declined significantly by day 10.
Conclusions:
- Impaired left ventricular function in CVB3 myocarditis may result from cumulative viral-induced myofiber destruction.
- Alternatively, virally triggered immune responses against cardiac cells could lead to functional impairment.