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Transauricular embolization of the rabbit coronary artery for experimental myocardial infarction: comparison of a minimally invasive closed-chest model with open-chest surgery
© Katsanos et al; licensee BioMed Central Ltd. 2012
Received: 19 October 2011
Accepted: 13 February 2012
Published: 13 February 2012
To date, most animal studies of myocardial ischemia have used open-chest models with direct surgical coronary artery ligation. We aimed to develop a novel, percutaneous, minimally-invasive, closed-chest model of experimental myocardial infarction (EMI) in the New Zealand White rabbit and compare it with the standard open-chest surgical model in order to minimize local and systemic side-effects of major surgery.
New Zealand White rabbits were handled in conformity with the "Guide for the Care and Use of Laboratory Animals" and underwent EMI under intravenous anesthesia. Group A underwent EMI with an open-chest method involving surgical tracheostomy, a mini median sternotomy incision and left anterior descending (LAD) coronary artery ligation with a plain suture, whereas Group B underwent EMI with a closed-chest method involving fluoroscopy-guided percutaneous transauricular intra-arterial access, superselective LAD catheterization and distal coronary embolization with a micro-coil. Electrocardiography (ECG), cardiac enzymes and transcatheter left ventricular end-diastolic pressure (LVEDP) measurements were recorded. Surviving animals were euthanized after 4 weeks and the hearts were harvested for Hematoxylin-eosin and Masson-trichrome staining.
In total, 38 subjects underwent EMI with a surgical (n = 17) or endovascular (n = 21) approach. ST-segment elevation (1.90 ± 0.71 mm) occurred sharply after surgical LAD ligation compared to progressive ST elevation (2.01 ± 0.84 mm;p = 0.68) within 15-20 min after LAD micro-coil embolization. Increase of troponin and other cardiac enzymes, abnormal ischemic Q waves and LVEDP changes were recorded in both groups without any significant differences (p > 0.05). Infarct area was similar in both models (0.86 ± 0.35 cm in the surgical group vs. 0.92 ± 0.54 cm in the percutaneous group;p = 0.68).
The proposed model of transauricular coronary coil embolization avoids thoracotomy and major surgery and may be an equally reliable and reproducible platform for the experimental study of myocardial ischemia.
Keywordsendovascular coil heart transcatheter left anterior descending animal study experimental myocardial ischemia embolization ligation
Ischemic coronary artery disease is a major cause of morbidity and mortality. Appropriate animal models are essential in order to investigate the mechanisms of myocardial infarction and develop new therapeutic interventions. During the last years, experimental myocardial ischemia (EMI) has been one of the most extensively studied topics in modern cardiovascular research. A large body of evidence has been amassed regarding the pathophysiology, pharmacological treatment strategies and relevant interventional therapy in the setting of acute and chronic myocardial ischemia and infarction [1–3]. Experimental coronary infarction and ischemia of the myocardium may be produced in many animal species and in various ways. Most animal studies on EMI have employed the traditional open-chest platform with thoracotomy and direct surgical ligation of the left coronary artery. Open-chest procedures allow direct access to the heart with visual inspection of procedural results, while immediate contact to the epicardial coronary vessels provides the opportunity for accurate measurements of coronary blood flow and other relevant hemodynamic parameters [4, 5].
However, open-chest EMI is associated with local and systemic side effects of major surgery. The preceding pericardial incision bears little pathophysiological relevance to human clinical afflictions and may disturb the progression of myocardial remodelling, whereas major surgery alone may affect whole body homeostasis and alter local and systemic immunological and inflammatory responses [6, 7]. Alternative closed-chest models of EMI that mainly use endovascular catheterization techniques have been developed, where transcatheter access to the coronaries is typically gained via surgical cutdown and exposure of the carotid or femoral artery. Closed-chest models of EMI primarily avoid the major trauma of thoracotomy with its potential influence on cardiac and whole-body physiology and recovery. Most importantly, they may induce more physiologically more clinically relevant myocardial ischemia . The aim of the present study was to establish a closed-chest, solely percutaneous, minimally invasive technique in order to induce EMI by transauricular embolization of the left coronary artery of the rabbit heart. This model of percutaneous transauricular EMI in the rabbit was compared with the gold standard of experimental myocardial infarction as induced by coronary ligation with a plain suture.
New Zealand White rabbits weighing 2.5-3.5 kg were kept in separate cages in an environmentally controlled animal research facility. Food and water were provided ad libitum. This investigation was carried out in conformity with the "Guide for the Care and Use of Laboratory Animals" published by the National Institutes of Health (NIH publication No. 86-23, revised 1985) and was approved by the local Hospital's Scientific and Ethics Committee. All EMI procedures were performed with the animals under dissociative anesthesia with a mixture of ketamine (35 mg/kg) and xylazine (5 mg/kg) i.m. . The experimental protocol consisted of two groups. Group A underwent EMI with an open-chest method involving surgical tracheostomy, a mini median sternotomy and left anterior descending coronary artery ligation with a plain suture. Group B underwent EMI with a closed-chest method involving transauricular superselective catheterization of the left anterior descending coronary artery and distal percutaneous embolization with the introduction of a micro-coil.
Surgical open-chest technique
After induction of dissociative anesthesia as described previously, subsequent anesthesia was maintained with low doses of propofol. The surgical procedure was performed under aseptic conditions. The rabbits were placed in the supine position. A standard 22-gauge intravenous catheter was inserted into the marginal auricular vein to establish intravenous access. Prophylactic antibiotics (cefuroxime 25 mg/kg i.m.) were administered before and after surgery. The skin was clipped and shaved and standard electrocardiography (ECG) electrodes were attached in both the front limbs and bilateral sides of the lower abdomen. Arterial oxygen saturation was measured with a pulse oximeter. ECG signs, systemic blood pressure and pulse oximetry were monitored continuously during EMI induction. A surgical tracheostomy was performed and the rabbit was ventilated with room air through a 3.5-mm pediatric tracheal tube at a rate of 35-40 breaths per minute and a tidal volume of 10-15 ml using room air enriched with oxygen.
Percutaneous closed-chest technique
Blood biochemistry and histopathology
Blood samples were taken and levels of myocardial enzymes were measured in blood serum. Aspirate aminotransferase (AST), lactate dehydrogenase (LDH), creatine kinase (CK), the MB isoenzyme of creatine kinase (CK-MB) and troponin were measured with microparticle enzyme immunoassay (ΜΕΙΑ- AxSYM Abbott) and Liaison assay before and at 6, 12 and 24 hours after EMI induction to confirm myocardial infarction. Four weeks after endovascular or surgical EMI induction, the rabbits were anesthetized again as described previously. A median sternotomy was performed and adhering tissue was carefully removed around the myocardium. The rabbits were anticoagulated with 1,000 IU heparin intravenously to prevent clotting. Hearts were then dissected and excised with the aortic root. Following macroscopic examination, 3 mm-thick sections were taken at the greatest dimension of visible "gray-white" post-infarct fibrotic areas and then fixed in 10% formalin and embedded in paraffin. Four-μm sections from paraffin-embedded blocks were stained with hematoxylin-eosin (H&E) and Masson trichrome staining for further histopathological analysis.
Discrete variables were expressed as counts and percentages and continuous variables were given as means ± standard deviation. The unpaired t test was used to test the significance of difference of variables. The Welch's correction was applied in case of comparisons with unequal sample variances. Statistical analysis was performed with use of the GraphPad Prism statistical software package (version 5; GraphPad Software, La Jolla, California, USA). The threshold of statistical significance was set at a p value of 0.05.
A total of 38 rabbits were used in the surgical open-chest group A (n = 17) and percutaneous closed-chest group B (n = 21). There were 5 deaths in the surgical procedure group equivalent to an overall mortality of 29.4% (5/17). Two of the subjects died immediately after the operation, one due to ventricular fibrillation and one because of ligation of LAD too proximally to its origin. The other three died 2-10 days after surgical procedure, two of unknown causes and one because of sepsis.
On the other hand, 9 deaths were recorded in the percutaneous closed-chest group B. The most common cause of death was ventricular fibrillation, electromechanical dissociation and progressive cardiogenic shock, all of which were usually associated with very proximal coil placement covering the ostium of the diagonal branch that provides critical perfusion of the atrioventricular node. One rabbit died because of coronary artery dissection. Another one died due to severe artery spasm because of long-lasting residence of the microcatheter inside the left coronary artery. Two rabbits suffered a late death during the first 10 days after EMI induction. The overall mortality rate was 42.9% (9/21). There was no difference in the mean body weight between the two groups before LAD occlusion and at the day of euthanasia 4 weeks later.
ECG and biochemistry results
Closed-chest transauricular coronary embolization
n = 21
n = 17
Weight (kg) at baseline
3.15 ± 0.25
3.13 ± 0.23
Weight (kg) at 4 weeks
3.30 ± 0.3
3.27 ± 0.28
ST elevation (mm)
2.01 ± 0.84
1.90 ± 0.71
Troponin (ng/ml) baseline
0.06 ± 0.06
0.05 ± 0.09
Troponin (ng/ml) (24 h)
47.6 ± 64.6
44.5 ± 57.7
36.8 ± 21.4
33.2 ± 20.4
110.0 ± 87.3
105.8 ± 87.6
169.4 ± 112.2
176.2 ± 101.8
967.4 ± 976.9
913.3 ± 820.8
CPK baseline (U/L)
1,072.0 ± 367.7
1,007.8 ± 287.2
6,725.8 ± 4,642.1
6,386.3 ± 3,921.4
CK -(MB) baseline (ng/ml)
0.87 ± 0.42
0.82 ± 0.33
CK -(MB) (ng/ml)*
2.88 ± 1.68
2.78 ± 1.37
Abnormal Q waves
All surviving animals
All surviving animals
Infarct size, cm (range)
0.92 ± 0.54 (0.3-2.0)
0.86 ± 0.35(0.5-1.7)
Baseline LVEDP (mmHg)
6.7 ± 1.8
6.2 ± 1.7
4-week LVEDP (mmHg)
12.9 ± 2.3
12.7 ± 2.0
Cardiac function and hemodynamic outcomes
Cardiac function was assessed by recording left ventricular end-diastolic pressure (LVEDP) that offers an indication of heart systolic function. LVEDP measurements were taken from an intraventricular catheter before, immediately after EMI and also before animal euthanasia. EMI caused a significant increase in LVEDP in all infarcted groups as evidence of myocardial dysfunction. LVEDP increased to a similar extent in both groups measuring 12.7 ± 2.0 vs 12.9 ± 2.3 mmHg at 4 weeks before euthanasia, compared to 6.2 ± 1.7 vs 6.7 ± 1.8 mm Hg at baseline for the surgical group A and the percutaneous group B, respectively.
In this study, we have developed a solely percutaneous minimally invasive method to occlude the left anterior descending artery and produce experimental myocardial infarction by employing interventional catheterization techniques and fluoroscopic guidance. Transauricular percutaneous EMI may avoid thoracotomy, pericardial incision and other local and systemic side effects of major surgery and may therefore achieve a more physiological model of EMI. From a historical perspective, except from LAD ligation with plain sutures [3, 4, 11], which has been the standard surgical technique of EMI ever since 1881 , there are also open-chest techniques where coronary blood flow restriction may be established by circumferential placement of an ameroid constrictor , a non-elastic Dacron stripe  or compression by an arterial puncture needle . Moreover, induction of coronary artery occlusion by cryoinfarction  or electrolytic coronary injury and thrombosis  has been reported. Researchers have also established closed-chest techniques of EMI with the application of various different embolic materials like plugs , balloons , coils , beads , microspheres , or even gelatine sponges . Myocardial necrosis has been also achieved by intracoronary injection of irrigative chemical substances like ethanol or ethyl-alcohol  and thrombosis of the LAD artery .
Most importantly, closed-chest EMI may induce more physiologically relevant myocardial ischemia for the study of cardiac ischemic recovery and remodeling, as well as for pharmacological investigations of novel cytokine-, gene- or cell-based proangiogenic therapies (heart therapeutic angiogenesis) . There is immediate angiographic documentation of LAD stenosis or occlusion and because of its endovascular nature the options of studying myocardial reperfusion, preconditioning and thrombolysis are inherently offered. On the other hand, depending on the technique, the exact location and length of coronary artery occlusion, the overall volume of myocardial necrosis, the rate and time of spontaneous thrombolysis, the extent of endothelial damage and the amount of reflux of the injected agent into proximal coronary arteries and side branches cannot be easily controlled nor estimated [24, 26]. In order to achieve a fairly reproducible model of EMI we used a very short micro-coil delivered to the distal half of the rabbit LAD and beyond the origin of the diagonal branch. Obstruction of the latter would lead to fatal cardiac arrythmias. In addition, the proposed method requires the mastering of advanced technical skills in microcatheter manipulation and transcatheter embolization, employs fluoroscopic guidance and use of expensive instruments is necessary.
To date, myocardial ischemia has been widely studied in different species of animals. Big animals such as the swine, dog, sheep and smaller like the rabbit and the rat have been extensively used in EMI research [3, 27]. Large animals may be more suitable for cardiovascular studies because of their anatomy and physiology, but are often cost-prohibitive and have the disadvantage of costly housing and difficulties in handling and manipulation. The rabbit was our choice because of its small size, universal availability and low cost. It has been also shown that the rabbit heart bears similar anatomy and pathophysiology to the human heart in that both recruit poor collaterals after ischemia [27, 28], thus making them well suited for EMI studies.
Derugin et al. described a method of occluding the left circumflex coronary artery with a small, nonmagnetic coil that was fluoroscopically guided via the left femoral artery in seven rabbits . However, in this study there was no control group available. Edwards and his colleagues also reported a closed-chest technique of myocardial infarction in the rabbits by placement of a 0.36 mm thrombogenic coil in the circumflex artery via the right common carotid artery that was accessed through median cervical incision . The herein proposed methodology is solely percutaneous and was also compared with the gold standard of experimental myocardial infarction induced by LAD ligation with a plain suture. A micro-coil was advanced in the coronary artery via a transauricular endovascular access, which was accomplished by percutaneous catheterization of the central auricular artery of the rabbit. From a technical perspective, LAD micro-coil embolization has the primary advantage of controlled and precise artery occlusion under high-quality fluoroscopic guidance. In the present EMI model, insertion of a very small micro-coil is proposed in order to be accommodated by the very small caliber distal coronary artery that has a diameter of less than 1 mm.
Traditionally, intra-arterial access in an animal is achieved by surgical cutdown of the femoral or cervical arteries and veins, which may be finally ligated and thrombosed, limiting future reuse of the vessel. The transauricular approach is a safe, quick, minimally invasive, and highly successful technique to achieve central endovascular access in the rabbit experimental model. It obviates surgical cutdown and sacrifice of the femoral and cervical vessels. Moreover, the subjects experience less pain, bleeding complications, and wound infections [10, 30, 31]. A relative limitation of the transauricular approach is the destruction of the peripheral segment of the auricular artery during sheath insertion. However, to our experience this is always followed by uneventful healing with development of granulation tissue at the dorsum of the auricle. Alternatively, the rabbit transauricular intra-arterial access may be directly gained with a microcatheter in a sheathless way as proposed elsewhere .
In comparison with the surgical model of EMI with plain suture LAD ligation, the percutaneous closed-chest model demonstrated almost equivalent increase of troponin and other cardiac enzymes in blood serum after myocardial infarction without any statically significant differences between the two groups. Regarding ECG changes, the ST-segment elevated immediately after surgical ligation of left anterior descending artery, whereas in the percutaneous technique the ST elevation was recorded 15-20 min after coil embolization of the coronary artery, probably because of gradual coil thrombosis and delayed total thrombotic occlusion of the artery. ECG showed abnormal Q waves in all surviving animals of both groups. Moreover, cardiac function as estimated by LVEDP was similarly disturbed in both groups 4 weeks after EMI induction. Finally, there was no statistically significant difference in the myocardial infarcted area between the 2 groups. The overall mortality was higher in the minimally invasive model in comparison with the surgical model, probably due to the steep learning curve of the embolization technique and the very small caliber of the target vessel that could abruptly spasm or thrombose. However, with amassed experience and careful choice of size and shape of catheters and drugs periprocedural mortality may be reasonably reduced. We would anticipate more optimal results with the use of finer microcatheters and guidewires like the ones suitable for neurovascular interventions. In conclusion, the herein presented minimally invasive model of percutaneous transauricular coronary coil embolization technique may be a reliable and reproducible platform for the experimental study of myocardial ischemia.
Sources of funding: This study was supported by a University of Patras, Research Programme "K.Karatheodori". Dr. Sofoklis Mitsos also reports support by a scholarship for doctoral studies of Alexander S. Onassis Public Benefit Foundation, Greece.
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