What question did this study set out to answer?

To examine myocardial contractility, relaxation, and dobutamine-induced stress responses in conscious diabetic rats, while evaluating whether insulin treatment prevents cardiac dysfunction.

December 1, 2006Cardiovascular DiabetologyOpen Access

Myocardial performance in conscious streptozotocin diabetic rats

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Why the study?

Does insulin treatment prevent myocardial function alterations in conscious STZ-diabetic rats?

Population

Conscious rats, 15 days after the onset of diabetes caused by streptozotocin (STZ)

Comparison

Insulin treatment vs Control rats treated with vehicle and untreated…

Design

Preclinical

Follow-up

15 days after the onset of diabetes

Authors

GBGiulianna R. BorgesUniversity of Iowa MOMauro de OliveiraUniversidade de São Paulo HSHélio César SalgadoUniversidade de Ribeirão Preto

Discussion

Member takes

Implication

Insulin may preserve hemodynamics in diabetic rat models; hypothesis-generating for human diabetic cardiomyopathy and should not yet change practice.

Key Points

To examine myocardial contractility, relaxation, and dobutamine-induced stress responses in conscious diabetic rats, while evaluating whether insulin treatment prevents cardiac dysfunction.
Evaluated cardiac contractility (+dP/dtmax) and relaxation (-dP/dtmax) using left ventricular pressure measurements in conscious rats 15 days following streptozotocin-induced diabetes.
Assessed myocardial response to pharmacological stress using low (1 µg/kg) and high (15 µg/kg) doses of dobutamine across vehicle controls, diabetic rats, and insulin-treated diabetic rats.
Conscious STZ-diabetic rats exhibited significantly reduced basal mean arterial pressure, heart rate, +dP/dtmax, and -dP/dtmax relative to vehicle controls (P < 0.05).
Insulin administration completely prevented the basal hemodynamic and left ventricular functional impairments observed in untreated diabetic rats.
Low-dose dobutamine triggered marked increases in heart rate and contractility indices exclusively in diabetic rats, while high-dose dobutamine elicited comparable responses across all groups.

Structured PICO

Does insulin treatment prevent myocardial function alterations in conscious STZ-diabetic rats?

Population

Conscious rats, 15 days after the onset of diabetes caused by streptozotocin (STZ)

Intervention

Insulin treatment

Comparator

Control rats treated with vehicle and untreated STZ-diabetic rats

Outcome

Cardiac contractility and relaxation evaluated by maximum positive (+dP/dtmax) and negative (-dP/dtmax) values of first derivative of left ventricular pressure over timesurrogate

Insulin treatment prevents the hemodynamic and myocardial function alterations, including low indices of contractility and relaxation, observed in conscious STZ-diabetic rats.

Cite This Study

Borges et al. (2006) studied this question.

synapsesocial.com/papers/6a84f7d400c11d531f9dec50 https://doi.org/10.1186/1475-2840-5-26

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Implication

Insulin may preserve hemodynamics in diabetic rat models; hypothesis-generating for human diabetic cardiomyopathy and should not yet change practice.

Myocardial performance in conscious streptozotocin diabetic rats

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Myocardial performance in conscious streptozotocin diabetic rats

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

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