Effects of Pressure Loading on Heart Function in Dogs
Author Information
Author(s): Lavine Steven J, Conetta Donald A
Primary Institution: Wayne State University
Hypothesis
The LV systolic, diastolic, and hemodynamic response to pressure loading would be similar in RedEF or PreEF.
Conclusion
Pressure loading in a canine model of LV dysfunction with PreEF and RedEF resulted in similar degrees of LV dilatation, increased filling pressures, and increased index of myocardial performance.
Supporting Evidence
- LV size was larger and ejection fraction lower in dogs with reduced ejection fraction.
- Both groups demonstrated similar increases in LV size and pressures with methoxamine.
- Diastolic parameters showed similar increases in both groups.
Takeaway
This study looked at how pressure affects the hearts of dogs with different types of heart problems, and found that both types respond similarly.
Methodology
The study involved 25 dogs with reduced ejection fraction and 20 dogs with preserved ejection fraction, where arterial pressure was increased using methoxamine infusion and various heart function parameters were measured.
Limitations
The applicability of the coronary microembolization model for producing LV dysfunction is questioned, and the results may not directly translate to humans.
Participant Demographics
Dogs aged 16-24 kg, with chronic LV dysfunction induced by coronary microsphere embolization.
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.01
Digital Object Identifier (DOI)
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