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Ann Thorac Surg 2003;76:281-283
© 2003 The Society of Thoracic Surgeons


Case report

A fatal complication due to radiofrequency ablation for atrial fibrillation: atrio-esophageal fistula

Bingur Sonmez, MDa, Ergun Demirsoya*, Naci Yagan, MDa, Mehmet Unal, MDa, Harun Arbatli, MDa, Deniz Sener, MDb, Turker Baran, MDb, Feryal Ilkova, MDc

a Departments of Cardiovascular Surgery, Istanbul Memorial Hospital, Istanbul, Turkey
b Department of Cardiology, Istanbul Memorial Hospital, Istanbul, Turkey
c Department of Gastroenterology, Istanbul Memorial Hospital, Istanbul, Turkey

Accepted for publication December 23, 2002.

* Address reprint requests to Dr Demirsoy, Necip Bey Sok. Melen Apt., 6, 681010, Acibadem-Istanbul, Turkey
e-mail: ergundemirsoy{at}hotmail.com


    Abstract
 Top
 Abstract
 Introduction
 Comment
 References
 
Treatment of chronic atrial fibrillation with intraoperative radiofrequency ablation is gaining more acceptance in patients with rheumatic valve disease. This article reports a case of fatal atrio-esophageal fistula after radiofrequency ablation in a patient with rheumatic mitral and aortic valve disease with chronic atrial fibrillation.


    Introduction
 Top
 Abstract
 Introduction
 Comment
 References
 
Intraoperative radiofrequency (RF) ablation for atrial fibrillation (AF) is more commonly used by cardiac surgeons [14]. However, the procedure is associated with fatal complications [3, 5], as presented in this article. In this case report, we relate the history of a patient readmitted for an atrio-esophageal fistula after RF ablation for chronic AF during mitral and aortic valve replacement surgery.

A 58-year-old white woman was admitted to the surgical ward with rheumatic aortic and mitral valve disease complicated by atrial fibrillation for 6 years. Detailed transesophageal echocardiographic (TEE) evaluation revealed severe aortic stenosis and regurgitation, mitral and tricuspid valve regurgitation due to annular dilatation, biatrial enlargement and mild left ventricular dysfunction. Left atrial (LA) diameter was 78 mm, calculated pulmonary artery pressure was 58 mm Hg. Angiocardiography demonstrated ostial stenosis of the right coronary artery of about 80%.

During operation TEE was not performed. The esophagus was occupied solely by a nasogastric tube. A standard median sternotomy and bicaval cardiopulmonary bypass was instituted and the mitral valve was visualized through a left atriotomy. The Cobra RF System (Boston Scientific, Boston, Natick, MA) catheter was used to create ablation lines at 80°C for 120 seconds. To isolate the right pulmonary vein group we created a C-shaped line as a continuation of the left atriotomy incision and thus encircled these two right pulmonary veins. The two left pulmonary veins were encircled in a second maneuver, and both circles were then connected by a transverse line. Another line was also created to connect the left pulmonary vein circle to the midportion of the posterior mitral annulus. This was done using cold cardioplegia to protect the posterior sulcus. All of these procedures were performed as we were trained by Dr Melo[1]. The ablation procedure was performed before replacement of both the mitral and aortic valves with bileaflet mechanical valves (St Jude Medical, Inc, St Paul, MN). A De Vega repair of the tricuspid valve was also performed to reduce annular dilatation. The left atrial appendage orifice was oversewn before the closure of the left atrium. Finally, an aorto–right coronary artery bypass was performed with a saphenous vein graft.

Postoperative recovery was complicated only by paroxysmal atrial fibrillation–flutter, which was treated with amiodarone. The patient was discharged on postoperative day 7 while AF was alternating with sinus rhythm. Amiodarone was prescribed and restoration of a definitive sinus rhythm was expected.

Twenty-two days after the operation, the patient was readmitted with fever (39°C), shivering, and numbness in the right arm. The latter was spontaneously relieved after hospitalization. Transthoracic echography demonstrated normal functioning of the prosthetic valves, and the presence of a thrombus was suspected in the left atrium wall. Transesophageal echocardiography confirmed a thrombus near the appendage remnant also. The patient’s neurologic condition suddenly deteriorated to an unconscious state and immediately transferred to the operating room. Rapidly cardiopulmonary bypass was instituted and the thrombus on the appendage remnant and around the pulmonary vein orifices was cleared out. After careful inspection of the mitral valve prosthesis, the left atrium was closed and the patient was weaned from bypass without difficulty. Sudden massive bleeding from the nasogastric tube developed before the chest was closed. Urgent esophagoscopy revealed a bleeding laceration of 15 mm diameter on the anterior wall of the esophagus 33 cm from the incisors (Fig 1). The patient was put on crush cardiopulmonary bypass again. Gas bubbles were detected in the left atrium probably resulting from the esophagoscopy. Air was passing through this laceration into the left atrium (between the two circles created by the ablation lines around the right and left pulmonary veins), which was not seen during the first attempt. The laceration was repaired with a pericardial patch reinforced with sutures. The esophageal bleeding stopped, and the nasogastric tube was kept in place in case of an eventual esophageal intervention. A cerebral CT scan performed 24 hours later showed wide ischemic lesions on both hemispheres, indicating cerebral emboli. The patient never recovered with regard to her neurologic status and she died of multiorgan failure 20 days after a second intervention. Her family did not consent to an autopsy.



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Fig 1. Bleeding laceration (1.5 cm in diameter) on anterior wall of esophagus 33 cm from incisors, as revealed by esophagoscopy.

 

    Comment
 Top
 Abstract
 Introduction
 Comment
 References
 
Radiofrequency and cryoablation procedures have gained broader application than Cox-Maze procedures since the introduction of these less traumatic techniques [15]. We started performing RF ablation for chronic AF with mitral valve cases in 1999 and have since handled 32 cases, with an early success rate of 90%. This case represents the only procedure-related complication in our series. Because the same energy level was applied in ablation for all patients, we looked for other reasons that could explain this fatal complication. We suspected that overlapping lines might excavate the lesion at certain points and, with the help of local inflammation, reach the esophagus (Fig 2). Patients with a thin atrial wall resulting from atrial enlargement (>60 mm in diameter), as well as female patients, should be treated more cautiously (for instance, with less RF time and a lower temperature). Gillinov and associates [6] reported a similar fatal complication and advised caution with cachectic patients, who are likely to have a thin left atrium wall with very little tissue between the left atrium and the esophagus. A reasonable protective measure should be not to keep the TEE probe in place while connecting the two pulmonary artery circles so as to avoid direct thermal injury to the esophagus and also to avoid repetitive insertion of the TEE probe in the early postoperative period. Mohr and associates [3] reported 3 patients (1.3%) who developed atrio-esophageal fistula. Two of these patients were successfully treated but the third patient died. These investigators believed that this injury was related to mechanical trauma induced by the TEE probe. Patwardhan and associates [5] suggested that the bipolar mode of RF would be safer than the unipolar mode to avoid thermal injury to adjacent structures.



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Fig 2. Schematic drawing of topographical relationship between the heart (left) and the surrounding tissue (right). Anterioposterior and sagittal view demonstrate the proximity of the esophagus and the left atrium, separated by only the adventitia of the esophagus and the pericardium (arrow). (IVC = inferior vena cava; CS = coronary sinus; LA = left atrium, LPV = left pulmonary vein; PA = pulmonary artery; RA = right atrium; RPV = right pulmonary vein; RSPV = right superior pulmonary vein; RIPV = right inferior pulmonary vein; SVC = superior vena cava.)

 
Until we discover the exact mechanism leading to the formation of atrio-esophageal fistula after RF ablation, we have decided to try to reduce the incidence by taking several precautions: (1) passing a gauze pad through the oblique sinus of the pericardium [3]; (2) using continuous irrigating devices rather than the "dry" ones; (3) refraining from overlapping ablation lines (which requires considerable expertise); and (4) connecting the two circles with the transverse line at a higher level to avoid direct heat transmission to the esophagus.

In the case reported here, the esophageal bleeding and the endocarditis were treated successfully, but the patient died from neurologic complications. Whether these were caused by migration of thrombus in the left atrium or by air pumped by esophagoscopy, or both, is impossible for us to determine. In the fatal case reported by Mohr and associates [3], massive cerebral infarction resulting from air embolism was believed to have been caused by esophagoscopy.

In conclusion, we believe that atrio-esophageal fistula after RF ablation is a potentially lethal complication. The mechanism is still open to debate, and further experience is required to avoid esophageal injury.


    References
 Top
 Abstract
 Introduction
 Comment
 References
 

  1. Melo J.Q., Neves J., Adrago P., et al. When and how to report results of surgery on atrial fibrillation. Eur J Cardio-thorac Surg 1997;12:739-745.[Abstract]
  2. Sie H.T., Beukema W.P., Misier A.R. Radiofrequency ablation of atrial fibrillation in patients undergoing valve surgery. Circulation 1997;96(Suppl):450.
  3. Mohr W.F., Fabricius A.M., Falk V., et al. Curative treatment of atrial fibrillation with intraoperative radiofrequency ablation: short-term and midterm results. J Thorac Cardiovasc Surg 2002;123:919-927.[Abstract/Free Full Text]
  4. Sueda T., Imai K., Ishii O., et al. Efficacy of pulmonary vein isolation for the elimination of chronic atrial fibrillation in cardiac valvular surgery. Ann Thorac Surg 2001;71:1189-1193.[Abstract/Free Full Text]
  5. Patwardhan A.M., Dave H.H., Tamhane A.A., et al. Intraoperative radiofrequency microbipolar coagulation to replace incisions of the Maze III procedure for correcting atrial fibrillation in patients with rheumatic valvular disease. Eur J Cardio-thorac Surg 1997;12:627-633.[Abstract]
  6. Gillinov A.M., Pettersson G., Rice T.W. Esophageal injury during radiofrequency ablation for atrial fibrillation. J Thorac Cardiovasc Surg 2001;122:1239-1240.[Free Full Text]



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