The endoclamp device as a useful strategy during redo surgery on the aortic root and arch

The endoclamp device has been widely used in mini-invasive mitral valve surgery with very good results compared to the transthoracic clamp [1]. Some authors have underlined the safety and effectiveness of this device in complex and emergency operations [2]. We reported our experience during a redo operation related to a pseudoaneurysm that developed for total proximal anastomosis detachment after a classic Bentall operation.
A 19-year-old man with Marfan syndrome underwent a Bentall procedure due to a 55 mm aortic root aneurysm and severe bicuspid aortic valve regurgitation. Nine months later, he complained of fever, malaise and enteritis. Inflammatory markers were rising. Blood culture showed positivity of Staphylococcus hominis. Combination antibiotic therapy with gentamicin, ceftriaxone and vancomycin was started. An emergency transesophageal echocardiogram (TEE) and color Doppler mapping revealed the detachment of the valve conduit from the annulus and a large pseudoaneurysm. The prosthetic valve appeared to have normal motion and to be free of any vegetation. No aortic regurgitation was noted either (Figure 1 A). Color-flow imaging showed the entrance of most of the cardiac stroke volume into a large pseudoaneurysm covering almost the entire circumference and length of the Dacron graft as far as it could be seen (Figure 1 B). The computed tomography (CT) scan confirmed the TEE evidence (Figure 1 C). An urgent operation was planned. We decided to use an endoclamp device (End^oClamp Intra-aortic Occlusion Device, Edwards Lifesciences Corp); for this reason we inserted in the femoral artery an EndoReturn Arterial Cannula 21 Fr. The cardiopulmonary bypass was initiated prior to resternotomy with cannulation of the femoral vessels. After the resternotomy, massive bleeding from the right atrium happened. Immediately, the endoclamp device was inflated (Figure 2 A), the heart was arrested using Custodiol cardioplegia. A huge pseudoaneurysm was detected and the valve conduit was found to be hanging above the aortic ring, fully detached and suspended in place by the coronary arteries (Figure 2 B). Because the aortic annulus was completely destroyed by a previous endocarditis, we decided to implant a new valve conduit inside the left ventricular outflow tract (Figure 2 C). The postoperative period was uneventful and the patient was discharged home in good general condition.
This is new strategy to treat a giant pseudoaneurysm that developed for total proximal anastomosis detachment after a classic Bentall operation, which was successfully solved by the use of an endoclamp device. A prerequisite for this technique is the presence of an adequate site for the Endoclamp device inflation, preferably a Dacron graft, as in the present case. Moreover, the origin of the pseudoaneurysm must be well documented and be localized proximally to the site at which the Endoclamp device will be inflated. This technique obviates the use of profound hypothermia, thus reducing cardiopulmonary bypass (CBP) duration and its complications [3]. Currently, in the presence of a giant pseudoaneurysm closely related to the sternum, peripheral initiation of CPB with sternal opening during profound hypothermia is the technique most often advocated [4]. However, this technique is related to a long CPB duration. The duration of CPB seems to be an independent predictor of perioperative death for patients undergoing reoperation of the aortic root or ascending aorta [5] because it is related to numerous and dangerous complications. Consequently, redo operations on the ascending aorta and aortic arch are characterized by high morbidity and mortality. In order to reduce morbidity and mortality related to this operations, it is necessary to avoid profound hypothermia, reduce CPB duration and prevent complications related to technical complexity. In our opinion the Endoclamp device could be a useful and effective solution.
In conclusion, we advocate the use of the Endoclamp device not only for small thoracotomy mitral valve surgery but especially in the situation in which treatment is difficult and requires a well-planned operative strategy such as a redo operation in the ascending aorta and aortic arch.

Disclosure

The authors report no conflict of interest.

References

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