Capriglione LGA, Barchiki F, Ottoboni GS, Miyague NI, Suss PH, Rebelatto CLK, Pimpão CT, Senegaglia AC, Brofman PR. Comparison of two surgical techniques for creating an acute myocardial infarct in rats.
Braz J Cardiovasc Surg 2015;
29:505-12. [PMID:
25714202 PMCID:
PMC4408811 DOI:
10.5935/1678-9741.20140075]
[Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 05/26/2014] [Indexed: 11/20/2022] Open
Abstract
Objective
To perform a comparative assessment of two surgical techniques that are used
creating an acute myocardial infarc by occluding the left anterior descending
coronary artery in order to generate rats with a left ventricular ejection
fraction of less than 40%.
Methods
The study was completely randomized and comprised 89 halothane-anaesthetised rats,
which were divided into three groups. The control group (SHAM) comprised fourteen
rats, whose left anterior descending coronary artery was not occluded. Group 1
(G1): comprised by 35 endotracheally intubated and mechanically ventilated rats,
whose left anterior descending coronary artery was occluded. Group 2 (G2):
comprised 40 rats being manually ventilated using a nasal respirator whose left
anterior descending coronary artery was occluded. Other differences between the
two techniques include the method of performing the thoracotomy and removing the
pericardium in order to expose the heart, and the use of different methods and
suture types for closing the thorax. Seven days after surgery, the cardiac
function of all surviving rats was determined by echocardiography.
Results
No rats SHAM group had progressed to death or had left ventricular ejection
fraction less than 40%. Nine of the 16 surviving G1 rats (56.3%) and six of the 20
surviving G2 rats (30%) had a left ventricular ejection fraction of less than
40%.
Conclusion
The results indicate a tendency of the technique used in G1 to be better than in
G2. This improvement is probably due to the greater duration of the open thorax,
which reduces the pressure over time from the surgeon, allowing occlusion of left
anterior descending coronary artery with higher accuracy.
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