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- W2098613262 abstract "Reduced exercise capacity is a key symptom and an independent determinant of mortality in patients with heart failure. We analyzed the running activity of hamsters with cardiac dysfunction after myocardial infarction. In 39 male Syrian hamsters aged 10 to 12 weeks, a myocardial infarction (MI) was produced by permanent ligation of the left coronary artery. Spontaneous running activity in a wheel was monitored daily. After four weeks, left ventricular (LV) hemodynamics (catheter tip manometry) were measured at baseline and during inotropic stimulation (isoprenaline 0.03, 0.1 and 0.3 microg/kg/min i.v.). LV infarct size was quantified using planimetry. Four weeks post MI, daily running distance was reduced stepwise in animals with small (4-15% of LV: 9.8 +/- 3.4 km/d) and large (> 15% of LV: 7.5 +/- 3.5 km/d) MI, compared to sham-operated hamsters (11.5 +/- 1.5 km/d). Similar reductions were observed in maximum speed and distance of longest running period. MI size influenced daily running distance, maximum speed, and longest running period (linear correlations, all p < 0.05). MI size also impaired LV systolic and diastolic function under isoprenaline stimulation. The results suggest that myocardial infarction reduces running capacity and isoprenaline stimulated LV function in hamsters, mimicking impaired exercise performance in patients with heart failure. Analysis of running activity in hamsters with myocardial infarction offers a unique opportunity for non-invasive and serial functional assessment of heart failure in the experimental setting." @default.
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- W2098613262 date "2006-06-01" @default.
- W2098613262 modified "2023-09-26" @default.
- W2098613262 title "Decreased wheel-running activity in hamsters post myocardial infarction" @default.
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- W2098613262 doi "https://doi.org/10.1186/1479-5876-4-51" @default.
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