Interact CardioVasc Thorac Surg 2007;6:744-747. doi:10.1510/icvts.2007.162669
© 2007 European Association of Cardio-Thoracic Surgery
Institutional report - Cardiac general |
Mid-term results of peripheric cannulation after port-access surgery
Ertan Sagbasa,
Baris Caynaka,*,
Cihan Duranb,
Onur Sena,
Birol Kabakcia,
Ilhan Sanisoglua and
Belhhan Akpinara
a Department of Cardiac Surgery, Istanbul Science University, Group Florence Nightingale Hospitals, Abidei Hurriyet Caddesi 290, 34381 Sisli, Istanbul, Turkey
b Department of Radiology, Istanbul Science University, Group Florence Nightingale Hospitals, Abidei Hurriyet Caddesi 290, 34381 Sisli, Istanbul, Turkey
Received 9 July 2007;
received in revised form 24 August 2007;
accepted 24 August 2007
 Dr B. Akpinar discloses that he has a financial relationship with Medtronic, Inc.
*Corresponding author. Tel.: +90 532 5641103; fax: +90 212 2398791.
E-mail address: caynakbaris{at}hotmail.com (B. Caynak).
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Abstract
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Several minimally invasive approaches, avoiding median sternotomy, have been described within the last few years for cardiac surgery. Femoral arterial and venous cannulation for extracorporeal perfusion are required for many of these operations. The aim of this report is to assess the long-term outcomes of femoral cannulations in patients who underwent minimally invasive procedures. One hundred and sixty patients underwent operations by the port-access method between January 2002 and October 2006. Cardiopulmonary bypass was established by femoral artery-vein cannulation, and a transthoracic clamp was used for the aortic occlusion. One hundred and twenty-one patients were under follow-up in the outpatient clinic and 85 patients underwent Doppler ultrasonography (US) for femoral arterial and venous stenosis. The mean follow-up was 27.9 months (range 1–57 months). There were three hospital mortalities (1.86%), and five late mortalities in this series. The mean follow-up for the Doppler examination was 20.54 months (range 1–56 months). There were two seromas and three wound complications (2.48%), all of which healed after outpatient treatment. All of the flow patterns of the common femoral arteries (CFA) were triphasic except in three of the patients. Three patients (2.48%) were found to have arterial stenosis. One patient with intermittant claudication underwent percutaneous dilatation and stenting of the CFA. Doppler US detected luminal narrowing in two patients who had been having no symptoms, and they are being followed in the outpatient clinic without any complaints. We found a chronic recanalized thrombotic change in the common femoral vein (CFV) in one patient (0.63%). Our study demonstrates vessel patency and/or stenosis in patients without complaints. In conclusion, femoral artery and vein cannulation for port-access surgery with transthoracic clamping can be performed successfully with excellent results in the mid-term.
Key Words: Minimally invasive surgery; Complications; Ultrasound; Vascular disease
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1. Introduction
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Median sternotomy with cannulation of the ascending aorta and the right atrium/vena cava for cardiopulmonary bypass (CPB) has been the standard approach for most cardiac surgery procedures. Several minimally invasive approaches, avoiding median sternotomy, have been described within the last few years [1–3]. Femoral arterial and venous cannulation for extracorporeal perfusion are required for many of these operations. We have been performing port-access approaches since 2002. CPB was established by femoro-femoral cannulation in these operations.
The aim of this report is to assess the mid-term outcomes of femoral cannulations in patients who underwent minimally invasive procedures.
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2. Materials and methods
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The ethical commission of the hospital approved the study protocol. During the follow-up period, data were collected during outpatient visits, and Doppler ultrasonography (US) was performed. One hundred and sixty consecutive port-access operations were performed between January 2002 and October 2006. Patients with severe chest wall deformities, significant coronary artery disease, aortic valve insufficiency, lung adhesions, or iliac artery disease were excluded. In addition to routine angiography and echocardiography, each patient underwent a detailed evaluation preoperatively including a computerized axial tomography (CAT) scan and/or magnetic resonance imaging (MRI), as well as transesophageal echocardiography (TEE) and Doppler US and/or MR angiography for identification of such risk factors and proper patient selection. Patient characteristics are shown in Table 1. Most of these patients had mitral valve diseases. The surgical operations and the number of patients are shown in Table 2.
2.1. Surgical procedure
After standard induction of anesthesia, each patient underwent double lumen intubation for single lung ventilation. Following the administration of 2 mg/kg of heparin, a 17 F arterial cannula (DLP, Inc, Grand Rapids, MI) was introduced through the right internal jugular vein percutaneously to assist venous drainage during CPB. TEE monitorization was used routinely to evaluate the results of valve repair and detect evacuation of air. Patients were positioned supine with the right shoulder elevated, and external defibrillation pads were placed. A right lateral minithoracotomy (4–6 cm) in the fourth intercostal space was performed. A soft tissue retractor (Heartport Inc, Redwood City, USA) was used for the exposure of the surgical field, avoiding the division or traction of any rib. A 5-mm camera port (Storz, Karl Storz GmbH and Co, Tuttingen, Germany) was introduced through the fourth intercostal space front axillary line. A second port was introduced through the sixth intercostal space mid axillary line for left atrial venting and carbon dioxide insufflation, which began immediately after collapsing the right lung.
Simultaneously, the right femoral artery and vein were prepared by means of a 4-cm oblique incision in the groin. CPB was established by femoro-femoral cannulation. Venous cannulation was performed first. Although the sequence of cannulation can vary between clinics, it is our experience that maneuvering the femoral venous cannula can be more difficult in the presence of a 20 Fr arterial cannula in the femoral artery. The femoral vein was cannulated through two concentric pursestrings of 5-0 polypropylene suture to avoid occlusion of venous return from the right leg. A venotomy was made within the pursestring, and the 24–29 F femoral cannula (DLP, Inc, Grand Rapids, MI) was inserted. The cannula was advanced to the junction of the superior vena cava and right atrium over a flexible J wire using TEE for guidance. Once properly positioned, the venous cannula was secured and arterial cannulation was performed.
The common femoral artery was clamped proximally and distally. A transverse arteriotomy was made, leaving the posterior one-third of the artery intact. An 18–20 F arterial cannula (DLP, Inc, Grand Rapids, MI) was inserted proximally and secured with a Rummell tourniquet. Cardiopulmonary bypass was then initiated with the femoral arterial-venous cannula and the 17–19 F arterial cannula previously inserted in the right internal jugular vein, thus allowing adequate venous drainage. After weaning from bypass, the venous cannula was removed and the pursestring suture was tied. The arterial cannula was removed, and the transverse arteriotomy was closed using continuous 6-0 polypropylene sutures. In most patients arterial cannulation was uneventful. The use of open arteriotomy technique enhanced the cannulation. However, in patients with small femoral arteries, we could still manage with 18 Fr cannulas. Special care was given during the closure of the arteriotomy using a 6.0 polypropylene and single suture technique. With most of the patients being mitral valve and ASD closures, atherosclerotic vessels were uncommon.
The pericardium was opened 2 cm above and parallel to the phrenic nerve. Exposure was optimized with several pericardial stay sutures. Patients were cooled down to 28 °C. Both vena cavae were encircled with tapes for a drier operative field. A transthoracic clamp (Chitwood, Scanlan, St Paul, MN, USA) was introduced from the second intercostal space, front axillary line percutaneously. After cross-clamping of the aorta, a blood cardioplegia cannula was inserted in the ascending aorta. The left atrium was opened parallel to the interatrial groove. The Heart Port atrial retractor system (Heartport Inc, Redwood City, CA) was used for the exposure of the atrium.
2.2. Doppler examination
The femoral arteries and veins were evaluated by ultrasonography (US). US examination was performed by Siemens Sonoline Anteras, Germany. A 7-3 MHz multi hertz probe was used. Arteries were evaluated for flow rate and flow pattern. Normal arteries show a triphasic flow pattern in Doppler US. In stenotic arteries, Doppler flow patterns and flow rates change in prestenotic, stenotic, and poststenotic regions. Proximal to the lesion, the flow pattern is normal, while at the stenosis the peak velocity increases in proportion to the degree of stenosis. Focal areas of doubling of the measured peak systolic velocity have been shown to correspond to lesions of 50% narrowing in the luminal diameter of the artery. Distal to the stenosis, the peak systolic velocity returns to values equal to or lower than those proximal to the stenosis, and in color Doppler imaging there is turbulant flow.
For venous examination, the venous caliber and the existence of the turbulant flow were evaluated.
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3. Results
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One hundred and sixty patients underwent operations by the port-access method. Thirty-one patients were lost during the follow-up period, 121 patients were under follow-up in the outpatient clinic. The mean follow-up was 27.9 months (range 1–57 months). There were three hospital mortalities (1.86%), and five late mortalities in this series (Table 3).
Eighty-five patients underwent Doppler US for femoral arterial and venous stenosis. The mean follow-up for the Doppler examination was 20.54 months (range 1–56 months).
There were three wound complications in this series (2.48%), all of which healed after outpatient treatment. There were two seromas; one was healed after needle aspiration and compressed medical dressing, and the other became infected and needed wound treatment in the out-patient clinic (this case was included in the number of wound complications).
All of the flow patterns of the CFA were triphasic except in three of the patients. The flow rate was calculated to be between 60–212 cm/s (mean flow rate was 134.28 cm/s). The diameter of the CFV was calculated to be between 5.5–12.5 mm (mean diameter of the CFV was 7.9 mm).
In our series, three patients (2.48%) were found to have arterial stenosis. Of those, one patient (a 52-year-old woman) complained of claudication two months following the operation; Doppler US showed 70% narrowing in the lumen of the CFA. This patient underwent percutaneous dilatation and stenting of the CFA. The patient currently has no complaints and a control Doppler US detected no stenosis in the CFA lumen in outpatient examinations. Doppler US detected luminal narrowing in two patients who had been having no symptoms. The flow pattern of the CFA was monophasic and the flow rate was lower than normal (32 cm/s in one and 35 cm/s in the other). Those patients are being followed in the outpatient clinic without any complaints.
We found chronic recanalized thrombotic changes in CFV in one patient (0.63%). The lumen of the vein had narrowed and the wall was thicker than normal and there was flow in the venous lumen and no turbulance was detected.
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4. Discussion
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Port-access surgery reduces blood loss, hospital stay, and recovery time [4, 5]. These approaches require femoral vessel cannulation for cardiopulmonary bypass, which introduces a risk of femoral arterial and/or venous injury. Studies have shown that the risk of aorto-iliac problems was high in patients who underwent port-access surgery with endoaortic baloon occlusion. Besides these complications, this method is more expensive than the transthoracic clamp technique [6]. We preferred femoral artery and venous cannulation with a transthoracic clamp as described by Chitwood and colleagues for the occlusion of the ascending aorta to avoid these complications and to decrease the price of the surgery [7]. Therefore, we had no dissection of the aorta and none of the major aortic problems intraoperatively.
In general, minimally invasive procedures can be performed with bypass and clamp times that are not significantly longer than those during conventional techniques. Studies have shown that the prolonged period of limb ischemia in patients undergoing complex minimally invasive operations has the potential to cause ischemic complications in the cannulated extremity [8, 9]. In our group of patients, cardiopulmonary bypass and ischemic times can be compared with the conventional procedures and are found to be reasonable. Therefore, we did not experience any ischemic complications in the cannulated extremity which may have required a fasciotomy in the early postoperative period.
Muhs and friends published a study of arterial injuries from femoral artery cannulation in 739 consecutive patients who had port-access minimally invasive cardiac surgery [6]. They identified patients with new arterial insufficiency from the cannulation site. There were four patients having postoperative claudication, and of those, three of them had iliofemoral arterial occlusion or localized iliofemoral dissection and were treated with iliofemoral bypass, and one patient had localized FA stenosis treated by angioplasty. In our series of 160 patients, there was only one patient who complained of claudication. Doppler US and DSA showed a significant stenosis in this patient, and she underwent a percutaneous dilatation and stenting of the CFA. We examined all of the patients, except for those lost in the follow-up, for femoral cannulation problems in the outpatient clinic, and we performed Doppler US. We detected two patients having CFA stenosis without any symptoms, and treatment has not yet been necessary for these stenoses. Doppler US of the CFV showed chronic recanalized thrombotic changes in CFV in one patient having no symptoms.
Our study demonstrates vessel patency and/or stenosis in patients without complaints. Other studies in the literature have evaluated femoral cannulation problems retrospectively in patients with complaints.
In conclusion, femoral artery and vein cannulation for port-access surgery with transthoracic clamping can be performed successfully with excellent results in the mid-term.
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5. Study limitations
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5.1. This study has some limitations
Mean follow-up is not very long. There was a considerable number of patients who were lost to follow-up and as a consequence the Doppler follow-up was not complete in these patients. This was mainly due to geographical and economical constraints, which prevented the recruiting of some of the patients from rural areas during follow-up.
Another limitation is that a Doppler analysis was not performed immediatelly after the operation in all patients; and the comparison between initial status of femoral vessels and the data obtained during follow-up were not possible.
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References
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Abstract
1. Introduction
