Key result
nNOS gene deletion in mice exacerbated left ventricular dilation (P<0.05) and caused a dramatic fall in LV contractility in response to dobutamine (P<0.01) 8 weeks after myocardial infarction.
Why the study?
Does nNOS gene deletion exacerbate pathological left ventricular remodeling and functional deterioration after myocardial infarction in mice?
Population
nNOS-knockout mice (nNOS(-/-)) and their wild-type (WT) littermates matched for infarct size
Comparison
nNOS gene deletion vs Wild-type (WT) littermates
Design
Preclinical
Follow-up
8 weeks
Authors
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Findings in mice do not inform clinical practice; leaves open whether nNOS modulation benefits human heart failure.
Does nNOS gene deletion exacerbate pathological left ventricular remodeling and functional deterioration after myocardial infarction in mice?
p-value: p=<0.05
nNOS plays a crucial role in preventing adverse LV remodeling and maintaining myocardial beta-adrenergic reserve after MI, suggesting its upregulation is an important adaptive mechanism.
Dawson et al. (2005) studied Myocardial Infarction. nNOS gene deletion vs. Wild-type (WT) littermates was evaluated on Left ventricular remodeling (end-systolic and end-diastolic volume indices) (p=<0.05). nNOS gene deletion in mice exacerbated left ventricular dilation (P<0.05) and caused a dramatic fall in LV contractility in response to dobutamine (P<0.01) 8 weeks after myocardial infarction.
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