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CLINICAL RESEARCH: PERCUTANEOUS CLOSURE OF ASO

Cardiac perforation after device closure of atrial septal defects with the Amplatzer septal occluder

Abhay Divekar, MBBS^_*,_*, Tidimogo Gaamangwe, MSc, PEng, Nasir Shaikh, MBBS, Michael Raabe, MD and John Ducas, MD

^_* Section of Pediatric Cardiology, Health Sciences Center, Winnipeg, Manitoba, Canada
Section of Adult Cardiology, Health Sciences Center, Winnipeg, Manitoba, Canada
Section of Clinical Engineering, Health Sciences Center, Winnipeg, Manitoba, Canada
Section of Cardiovascular and Thoracic Surgery, Health Sciences Center, Winnipeg, Manitoba, Canada.

Manuscript received October 23, 2004; revised manuscript received December 18, 2004, accepted December 20, 2004.

^_* Reprint requests and correspondence: Dr. Abhay Divekar, FE-241, 685 William Avenue, Winnipeg, Manitoba R3E 0Z2, Canada. (Email: adivekar{at}exchange.hsc.mb.ca).

	Abstract

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OBJECTIVES: Amplatzer septal occluder (ASO)-associated cardiac perforation (CP) at our institution prompted this retrospective review.

BACKGROUND: Cardiac perforation is a rare complication after transcatheter atrial septal defect (ASD) closure.

METHODS: To identify CP after transcatheter ASD closure with ASO, cardiac events (CE) describing definite CP, hemopericardium, pericardial effusion, cardiovascular collapse, or sudden death were analyzed. Cardiac events were identified from published literature (MEDLINE), medical device regulating agencies in North America and the European Commission, and AGA Medical Corporation (Golden Valley, Minnesota). Institutional cases were reviewed. Cardiac events were defined as early (pre-discharge) or late (post-discharge).

RESULTS: Twenty-nine CEs were identified. Five were excluded because findings were inconclusive for device-related CP. Ten patients were <18 years of age. Late CEs occurred in 66.6%; 25% presented weeks later (longest, three years). Three deaths were reported. Cardiac perforation occurred predominantly in the anterosuperior atrial walls and/or adjacent aorta.

CONCLUSIONS: Amplatzer septal occluder-associated CP uniquely involves the anterosuperior atrial walls and adjacent aorta. Pathophysiology remains poorly understood.

Abbreviations and Acronyms   ASD = atrial septal defect   ASO = Amplatzer septal occluder   CE = cardiac events   CP = cardiac perforation   FDA = Food and Drug Administration   MAUDE = Manufacturer And User facility Device Experience database   PFO = patent foramen ovale   SBD = stretched balloon diameter   TEE = transesophageal echocardiography

	Methods

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Case definition.   To identify CP after transcatheter ASD closure with ASO, cardiac events (CE) describing definite CP, hemopericardium, pericardial effusion, cardiovascular collapse, or sudden death were analyzed. Cardiac events were defined as early (pre-discharge) or late (post-discharge).

Case identification.   Retrospective review was conducted of institutional cases including procedural transesophageal echocardiography (TEE) and catheterization data.

A literature search was conducted via MEDLINE using key words: Amplatzer, Amplatzer septal occluder, complications, perforation, erosions, cardiovascular collapse, sudden death, and hemopericardium.

During review, ASO-associated CPs were identified from the U.S. Food and Drug Administration (FDA) website prompting a search of CEs reported to other medical device regulating agencies in North America and the European Commission (websites and/or direct communication).

	Results

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Institutional cases.   A 24-year-old woman (case #29, 160 cm, 40.8 kg; Table 1) was the 13th patient undergoing device closure in March 2002. An ASD measuring 15 x 17 mm by TEE with a stretched balloon diameter (SBD) of 23 mm and deficient anterosuperior rim was closed with a 26-mm ASO using fluoroscopy and TEE. The device splayed over the aorta (Fig. 1); there was no residual shunt or impingement on cardiac structures. She was discharged the same evening on aspirin and clopidogrel. Chest radiograph was unremarkable. She was asymptomatic before collapse three days later. After cardiopulmonary resuscitation, emergent surgical exploration found a hemopericardium, and perforations were identified in the anterosuperior right atrial wall and the contiguous right posterior aortic wall. The device was removed, the ASD was closed, and the perforations were repaired. Life support was withdrawn three days later secondary to irreversible neurologic insult. Postmortem examination confirmed intraoperative findings (Fig. 2). Guidewire/delivery catheter-related injury was suggested, citing atraumatic rounded edge of the device and lack of published complications.

View larger version (160K): [in this window] [in a new window]   Figure 1 Transesophageal echocardiogram showing (A) device splayed over aortic root and (B) device without splaying over the aortic root. AO = aorta; ASO = Amplatzer septal occluder; RA = right atrium.

View larger version (145K): [in this window] [in a new window]   Figure 2 Postmortem illustration shows the atrial septum through the opened right atrium. The surgically closed ASD is seen (open arrow). Probe shows site of right atrial perforation at the edge of the retention disk with and without device superimposition (closed arrows). ASD = atrial septal defect; ASO = Amplatzer septal occluder; RAA = right atrial appendage; TV = tricuspid valve.

View larger version (116K): [in this window] [in a new window]   Figure 3 Intraoperative illustration shows the atrial septum through the opened right atrium before and after explanting the ASO. The right atrial perforation occurs at the edge of the retention disk (white arrow). AO = aorta; ASD = atrial septal defect; ASO = Amplatzer septal occluder.

Analysis of reported cases.   All cases reported to the manufacturer and regulating agencies and published in the literature have been accounted for and reported only once (Table 1). The U.S. FDA and Health Canada were the only agencies who had received reports of CP (Table 2). Only the U.S. FDA had free and easily accessible online information via the Manufacturer And User facility Device Experience (MAUDE) database.

Among the remaining 24 CEs, 14 had defined CP and hemopericardium, 3 had defined CP and fistula formation, and 5 had hemopericardium only. The ASO size ranged from 12 to 38 mm. Relationship between SBD and ASO size is shown in Table 3. Device malposition or breach in structural integrity was not reported. Information regarding ASD morphology and technical details was not consistently available.

Sites of CP are shown in Table 4. All CP (except case #4) occurred in the anterosuperior atrial walls and/or adjacent aorta. All patients with CP and hemopericardium had cardiac tamponade; pericardiocentesis was performed in 10 patients. Surgical exploration was performed in 19 of 24 patients. The ASO was explanted in 15 patients and remains implanted in 7 patients (no recurrences reported).

	Discussion

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Technique-related CP during catheterization is inherent to the procedure, typically occurs before hospital discharge and is amenable to intervention. In contrast, device-related CP occurs after a technically adequate procedure, frequently after hospital discharge (66.6% in this review), and has the potential for a fatal outcome (1).

The rounded design and flexibility of the ASO is speculated to minimize risk of CP, even when oversized (2). An occlusion device within confines of the anteroposterior septal length is subjected to deformation forces (9). Fatigue fractures are not reported with the ASO, and the disks retain preformed shape; we therefore hypothesize that the ASO transmits deformative forces to the tissues at the point of contact between the aorta, the device, and the anterosuperior atrial walls resulting in CP.

This review shows that the anterosuperior atrial walls and/or adjacent aorta are uniquely vulnerable, the side of the larger ASO disk does not predict site of CP (Table 4), trauma over multiple cardiac cycles can damage even the thicker, more resilient aortic wall, and larger devices are not disproportionately represented (13 devices 25 mm, 11 devices >25 mm) in patients with CP. The CP associated with other devices also involves the free/anterosuperior atrial walls and/or adjacent aorta (3,4).

Closure of ASDs with deficient anterosuperior rims and ability to intentionally oversize by splaying over the aorta are among published merits of the ASO (2). Registry review now suggests otherwise (1). Comparison among patients receiving intentionally oversized ASOs with and without complications is necessary. Registry recommendations, although important, need validation. Several points deserve scrutiny. First, CP developed in registry patients (10 of 28) with devices sized equal to the SBD (1). Second, CP did not develop in all patients receiving intentionally oversized devices (2). Third, recurrences are not reported in patients in whom CP developed where devices remain implanted. Forth, unpredictable timing for developing CP makes careful follow-up difficult.

All postmortem reports concluded CP to be non–device-related. With information now available, we believe that our patient clearly had device-related CP. It is possible that cases #27 and #28 (Table 1) with unexplained fresh blood in the pericardial sac, may now be seen in a different light.

Prior to November 2004, there are three reports of ASO-associated perforation or fistula formation (5–7). During the same interval, the MAUDE database reports several cases. Therefore, physicians should be aware of and utilize resources other than traditional literature. Ideally an international registry and periodic end-user notification is necessary.

Study limitations.   We acknowledge the limitations of this retrospective review. The MAUDE database is not intended for this purpose. The study was not designed for statistical analysis or causation but focuses on a poorly understood complication.

Informed consent should highlight device-related CP. Symptoms consistent with CP warrant prompt evaluation including urgent echocardiography. Widespread awareness may allow for timely recognition. Prompt pericardiocentesis before surgical exploration may minimize morbidity and mortality. Device removal should be considered in patients presenting with CP. Occluder size relative to anteroposterior septal dimension may be important and needs to be studied.

Understanding the pathophysiology of CP is crucial to the ongoing success of transcatheter therapy.

	Acknowledgments

 
The authors thank Colin Phoon, MD, NYU Medical Center, New York, New York, and Reeni Soni, MD, HSC, Winnipeg, Canada, for editorial support.

	References

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1. Amin Z, Hijazi ZM, Bass JL, Cheatham JP, Hellenbrand WE, Kleinman CS. Erosion of Amplatzer septal occluder device after closure of secundum atrial septal defectsreview of registry of complications and recommendations to minimize future risk. Catheter Cardiovasc Interv 2004;63:496-502.[CrossRef][ISI][Medline]
2. Harper RW, Mottram PM, McGaw DJ. Closure of secundum atrial septal defects with the Amplatzer septal occluder devicetechniques and problems. Catheter Cardiovasc Interv 2002;57:508-524.[CrossRef][ISI][Medline]
3. Schrader R. Catheter closure of secundum ASD using "other" devices J Interv Cardiol 2003;16:409-412.[CrossRef][Medline]
4. Pedra CA, Pihkala J, Lee KJ, et al. Transcatheter closure of atrial septal defects using the Cardio-Seal implant Heart 2000;84:320-326.[Abstract/Free Full Text]
5. Preventza O, Sampath-Kumar S, Wasnick J, Gold JP. Late cardiac perforation following transcatheter atrial septal defect closure Ann Thorac Surg 2004;77:1435-1437.[Abstract/Free Full Text]
6. Chun DS, Turrentine MW, Moustapha A, Hoyer MH. Development of aorta-to-right atrial fistula following closure of secundum atrial septal defect using the Amplatzer septal occluder Catheter Cardiovasc Interv 2003;58:246-251.[CrossRef][ISI][Medline]
7. Aggoun Y, Gallet B, Acar P, et al. Perforation of the aorta after percutaneous closure of an atrial septal defect with an Amplatz prosthesis, presenting with acute severe hemolysis Arch Mal Coeur Vaiss 2002;95:479-482.[ISI][Medline]
8. Ewert P, Kretschmar O, Peters B, et al. Preliminary experience with a new 18 mm Amplatzer PFO occluder for small persistent foramen ovale Catheter Cardiovasc Interv 2003;59:518-521.[CrossRef][ISI][Medline]
9. Latson LA. Per-catheter ASD closure Pediatr Cardiol 1998;19:86-93.[CrossRef][ISI][Medline]

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This Article Abstract Figures Only Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (36) Citing Articles via Google Scholar Google Scholar Articles by Divekar, A. Articles by Ducas, J. Search for Related Content PubMed PubMed Citation Articles by Divekar, A. Articles by Ducas, J.