Impact of Contractility Changes on Heart Function in Dogs
Author Information
Author(s): Steven J Lavine
Primary Institution: Wayne State University
Hypothesis
Inotropic agents reduce the index of myocardial performance by shortening isovolumic indices and possibly lengthening left ventricular ejection time with a resultant increase in diastolic filling period.
Conclusion
Increased inotropy with digoxin and dobutamine reduced the index of myocardial performance in dogs with left ventricular dysfunction.
Supporting Evidence
- The index of myocardial performance has prognostic power in patients with cardiomyopathy and following myocardial infarction.
- Dobutamine increased ejection fraction and reduced the index of myocardial performance.
- Digoxin increased ejection fraction and reduced left ventricular end diastolic pressure.
Takeaway
This study looked at how certain medications can help a dog's heart work better when it's not functioning well. The medications made the heart pump more efficiently.
Methodology
Chronic left ventricular dysfunction was induced in 10 canines using coronary microsphere embolization, followed by contractility assessment with dobutamine and digoxin.
Potential Biases
The use of dobutamine followed by digoxin may have generated a series effect.
Limitations
The applicability of findings to humans is limited, and the anesthesia used may influence results.
Participant Demographics
10 conditioned mongrel dogs, weighing 16–24 kg.
Statistical Information
P-Value
p < 0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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