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Ann Thorac Surg 2004;77:1315-1320
© 2004 The Society of Thoracic Surgeons
a Department of Thoracic and Cardiovascular Surgery, Cleveland Clinic Foundation, Cleveland, Ohio, USA
b Department of Biostatistics and Epidemiology, Cleveland Clinic Foundation, Cleveland, Ohio, USA
Accepted for publication August 15, 2003.
* Address reprint requests to Dr Sabik, Department of Thoracic and Cardiovascular Surgery, The Cleveland Clinic Foundation, 9500 Euclid Ave, Desk F25, Cleveland, OH 44195, USA
e-mail: sabikj{at}ccf.org
| Abstract |
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METHODS: From January 1993 to January 2001, 392 patients underwent 399 axillary artery cannulations. Indications included calcified ascending aorta (129, 32%), ascending aortic aneurysm (115, 29%), type I aortic dissection (85, 21%), cardiac reoperation (70, 18%), and calcified femoral artery (26, 6%). The axillary artery was cannulated directly in 212 (53%) and with a side graft in 187 (47%). Comparisons of cannulation-related morbidity between the direct cannulation and side graft groups were made overall and after both adjusting and matching for propensity score.
RESULTS: Cannulation-related morbidity was infrequent, with brachial plexus injury in 7 (1.8%), axillary artery damage in 7 (1.8%), aortic dissection in 3 (0.8%), and arm ischemia in 3 (0.8%). Only 4 of 187 (2.1%) occurred in the side graft group, versus 16 of 212 (7.0%) with direct cannulation (p = 0.03). After propensity adjustment, the odds ratio for reduction of risk of cannulation-related morbidity with use of a side graft was 0.15 (p = 0.002).
CONCLUSIONS: Use of the axillary artery as inflow for cardiopulmonary bypass is associated with low morbidity. However, cannulation with a side graft was associated with less cannulation-related morbidity than direct cannulation. Routine use of a side graft is recommended whenever axillary artery cannulation is indicated.
| Introduction |
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| Patients and methods |
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Technique of axillary artery cannulation
The axillary artery is exposed through a 6- to 8-cm incision below and parallel to the lateral two thirds of the clavicle (Fig 2A).
The pectoralis major is divided in the direction of its fibers and the clavipectoral fascia incised, exposing the pectoralis minor, which may be divided or retracted laterally. Using sharp dissection, the artery is dissected from surrounding tissue (Fig 2B). Care is taken not to injure the brachial plexus. Proximal and distal control of the axillary artery is obtained. After administration of heparin the artery is cannulated, either directly through a pursestring suture (Fig 3A)
or by means of a 10-mm prosthetic side graft anastomosed to the axillary artery (Fig 3B). By cannulating the artery in its medial portion, the brachial plexus is usually avoided.
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Operative procedures
All operations were performed through a median sternotomy. Eighty-four percent of patients had procedures involving the ascending aorta (Table 1).
Ascending aortic replacement was performed in 226 (58%), aortic root replacement in 80 (20%), and aortic endarterectomy in 24 (6%). Hypothermic circulatory arrest was performed in 257 patients (64%).
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Statistical methods
Analysis of morbidity
Three methods of comparing hospital morbidity were used. First, hospital outcomes were compared between the direct axillary artery cannulation patients and those cannulated via a prosthetic side graft, with no risk adjustment. Second, they were compared between propensity-matched patients. Third, the odds ratio of morbidity due to axillary artery cannulation was compared by logistic regression after adjustment for propensity score. We used the
2 test for comparisons when the minimum number of patients in a morbidity category was greater than five, and Fisher's exact test otherwise.
Medical records were examined to identify evidence of morbidity related to axillary artery cannulation, including arm ischemia, brachial plexus injury, axillary artery injury, and aortic dissection. In-hospital morbidity was also documented, including cerebral vascular accident, respiratory insufficiency, gastrointestinal bleeding, renal failure, sepsis, reoperation for bleeding, and death.
Propensity matching and adjustment
To reduce the influence of selection on comparison of morbidity, we used propensity matching and adjustment. Using preoperative and intraoperative variables (Table A1) and multivariable logistic regression, we determined the factors associated with receiving direct or side graft axillary artery cannulation (group membership). We examined continuous and ordinal variables using decile analysis, selecting those transformations of scale that best calibrated variables to group membership.
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Having established a parsimonious model (Table A2), we added other variables representing groups of patient and coronary disease factors that might be related to unrecorded selection factors (saturated model). The c statistic was 0.7. A propensity score was calculated for each patient by solving the saturated model for the probability of side graft cannulation.
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| Results |
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Unmatched comparison
Mortality and morbidity
Mortality in the direct and side graft cannulation patients was 7.6% and 8.6%, respec-tively (p = 0.7). Systemic morbidity was similar in both groups (Table 2).
Morbidity due to axillary artery cannulation
Complications related directly to axillary artery cannulation were higher in patients with direct cannulation than in those who had a side graft (7.5% versus 2%, p = 0.03; Table 2). Aortic dissection occurred in 3 (1.4%) patients who underwent direct cannulation, but in no patient who had a side graft (p = 0.2). Also, brachial plexus injury was more common in patients undergoing direct cannulation (2.8% versus 0.5%, p = 0.1). Odds ratio for risk reduction by the side graft technique was 0.29 (68% confidence limits, 0.16 to 0.51; p = 0.03).
Propensity-adjusted comparison
Mortality and morbidity
Hospital mortality for the propensity-matched patients undergoing direct axillary artery cannulation and cannulation by means of a prosthetic side graft was 6.4% and 9.3%, respectively (p = 0.4). Systemic morbidity was also similar in the two groups (Table 3).
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| Comment |
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Two different techniques may be used to cannulate the axillary artery: (1) a straight or angled cannula may be placed directly into the axillary artery, or (2) a side graft may be anastomosed onto the axillary artery and then cannulated with a straight cannula.
Principal findings
Axillary artery cannulation is a safe and reliable method of arterial cannulation for cardiopulmonary bypass. Cannulation-related complications are rare, with the most common being brachial plexus and axillary artery injury. Complications related directly to axillary artery cannulation can be reduced by cannulating the artery with a side graft.
The axillary artery is often fragile, so direct cannulation can be traumatic. Also, closure of the axillary artery arteriotomy after direct cannulation is difficult and can result in axillary artery narrowing. Cannulation with a side graft avoids both problems. The axillary artery is rarely injured during side graft anastomosis, and decannulation is simply performed by transecting it and oversewing and clipping its stump.
No patient in this series who underwent axillary artery cannulation with a side graft experienced an intraoperative aortic dissection, whereas 3 (2%) patients undergoing direct cannulation did. This is a devastating complication of peripheral arterial cannulation (femoral or axillary), believed to arise when an intimal flap develops during cannula insertion. The dissection progresses when arterial perfusion through the cannula is begun. By perfusing through an anastomosed side graft, risk of intraoperative aortic dissection should be reduced; in this series, it was importantly reduced.
Because of these findings, our preference is to cannulate the axillary artery with a side graft when the ascending aorta is not suitable for cannulation. A limitation of cannulation with a side graft is that it requires more time than direct cannulation. Therefore, in unusual situations of hemodynamic instability, direct cannulation may be preferable.
Limitations
A limitation of this study is the temporal relationship of patients undergoing direct and side graft cannulation. Although there was some overlap in time, most patients undergoing direct cannulation were early in the series, and most patients having cannulation with a side graft were late in the series. Therefore, we were more experienced with axillary artery cannulation in patients who underwent cannulation with a side graft. Although we believe it unlikely, it is possible that our greater experience with axillary artery cannulation, and not the cannulation technique, accounts for the decreased morbidity observed in patients undergoing a side graft procedure.
Another limitation of this study is that it is an observational clinical study and not a randomized trial. Although we have tried to eliminate the effect of selection bias on outcomes by using propensity matching, we may not have accounted for all variables that resulted in patients being chosen for either direct or side graft cannulation. Therefore, patient factors, not cannulation technique, may be responsible for the lower morbidity observed in the side graft cannulation patients.
Conclusions
Axillary artery cannulation is safe and reliable in patients with ascending aortic disease. Complications are rare, and their occurrence can be substantially reduced with use of a side graft. Routine use of a side graft when cannulating the axillary artery is recommended.
| Appendix |
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| References |
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