Permanent Right-to-Left Shunt Is the Key Factor in Managing Patent Foramen Ovale
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1 Journal of the American College of Cardiology Vol. 58, No. 21, by the American College of Cardiology Foundation ISSN /$36.00 Published by Elsevier Inc. doi: /j.jacc FOCUS ISSUE: STRUCTURAL HEART DISEASE Clinical Research Permanent Right-to-Left Shunt Is the Key Factor in Managing Patent Foramen Ovale Gianluca Rigatelli, MD, PHD,* Fabio Dell Avvocata, MD,* Paolo Cardaioli, MD,* Massimo Giordan, MD,* Gabriele Braggion, MD,* Silvio Aggio, MD,* Mauro Chinaglia, MD, Sangeeta Mandapaka, MD, John Kuruvilla, MD, Jack P. Chen, MD,* Aravinda Nanjundappa, MD Rovigo, Italy; Charleston, West Virginia; and Atlanta, Georgia Objectives Background Methods Results Conclusions We sought to prospectively evaluate risk of stroke and impact of transcatheter patent foramen ovale (PFO) closure in patients with permanent right-to left shunt compared with those with Valsalva maneuver-induced right-toleft shunt. Pathophysiology and properly management of PFO still remain far from being fully clarified: in particular, the contribution of permanent right-to-left shunt remains unknown. Between March 2006 and October 2010, we enrolled 180 (mean age years, 98 women) of 320 consecutive patients referred to our center for transcatheter PFO closure, who had spontaneous permanent right-toleft shunt on transcranial Doppler and transthoracic/transesophageal echocardiography. All patients fulfilled the standard current indications for transcatheter closure and underwent preoperative transesophageal echocardiography and brain magnetic resonance imaging, with subsequent intracardiac echocardiographic-guided transcatheter PFO closure. We compared the clinical echocardiographic characteristics of these patients (Permanent Group) with the rest of 140 patients with right-to-left shunt only during Valsalva maneuver (Valsalva Group). Compared with the Valsalva Group patients, patients of the Permanent Group had increased frequency of multiple ischemic brain lesions on magnetic resonance imaging, previous recurrent stroke, previous peripheral arteries embolism, migraine with aura, and more frequently atrial septal aneurysm and prominent Eustachian valve. The presence of permanent shunt confers the highest risk of recurrent stroke (odds ratio: 5.9, 95% confidence interval: 2.0 to 12, p 0.001). No differences were recorded between the 2 groups with regard to recurrence of ischemic events after the closure procedure. Despite its small-sample nature, our study suggests that patients with permanent right-to-left shunt have potentially a higher risk of paradoxical embolism compared with those without. (J Am Coll Cardiol 2011;58: ) 2011 by the American College of Cardiology Foundation Pathophysiology and proper management of patent foramen ovale (PFO) still remain far from being fully clarified: in particular, the anatomical and functional characteristics of PFO conferring an actual risk of recurrent stroke are still poorly understood. Our group (1,2) and other authors recently suggested large PFO, atrial septal aneurysm (ASA), long tunnelized PFO, and prominent Eustachian valve From the *Section of Adult Congenital and Adult Heart Disease, Cardiovascular Diagnosis and Endoluminal Interventions, Rovigo General Hospital, Rovigo, Italy; Department of Neuroscience, Rovigo General Hospital, Rovigo, Italy; CAMC Vascular Center of Excellence, West Virginia University, Charleston, West Virginia; and the Saint Joseph s Heart and Vascular Institute, Atlanta, Georgia. All authors have reported that they have no relationships relevant to the contents of this paper to disclose. Manuscript received April 5, 2011; revised manuscript received May 24, 2011, accepted June 16, (EV) as concurrent risk factors for recurrent stroke. The contribution of spontaneous right-to-left shunt still remains debated. Recently, different studies (3,4) about shunt grade resulted in contrasting data in favor of or against an increasing risk conferred by a large or permanent shunt. We sought to prospectively evaluate risk of stroke and impact of transcatheter PFO closure in patients with permanent right-to left shunt, compared with those with Valsalva maneuver-induced right-to-left shunt. Methods Between March 2006 and October 2010, we prospectively enrolled 320 consecutive patients referred to our center for transcatheter PFO closure. All patients fulfilled the standard current indications for transcatheter closure (5) and
2 2258 Rigatelli et al. JACC Vol. 58, No. 21, 2011 Defining a PFO High-Risk Population November 15, 2011: Abbreviations and Acronyms ASA atrial septal aneurysm EV Eustachian valve ICE intracardiac echocardiography MRI magnetic resonance imaging PFO patent foramen ovale TCD transcranial Doppler TEE transesophageal echocardiography underwent pre-operative transcranial Doppler (TCD), TEE, and brain magnetic resonance imaging (MRI), with subsequent intracardiac echocardiographic-guided transcatheter PFO closure. We compared the clinical and echocardiographic characteristics of patients with permanent (Permanent group) versus Valsalva onlyinduced right-to-left shunt (Valsalva group) and the potential impact of transcatheter closure. In particular, the 2 groups were matched by combined cardiological and neurological team members for previous medical history, brain MRI, number of clinically confirmed stroke episodes, and migraine presence and severity. Written informed consent was obtained from all patients enrolled in the study. Echographic protocols and definitions. The TEE was conducted with a GE Vivid 7 (General Electric Corporation, Norfolk, Virginia) with contrast injection and Valsalva maneuver under local anesthesia: right-to-left shunts were defined as permanent, small, medium, and large following Homma et al. (6), whereas ASA and prominent EV were defined following standard nomenclature (7). The PFO diameter was calculated with electronic caliper, measuring the maximum opening of the PFO in the end-diastolic frames. The TCD was performed with intravenous bubble study by a seasoned neurologist experienced in this examination, according to current standard (8) with a TCD monitoring device (DWL MultidopX, ScanMed Medical, Gloucestershire, United Kingdom). Both middle cerebral arteries were simultaneously monitored through the temporal window by the use of 2-MHz probes. The contrast was obtained by mixing 100 ml of saline solution with 2 to 3 ml of Emagel and loading a 10 cc syringe with this mixture. The solution, agitated between 2 10-ml syringes and connected by a 3-way stopcock, was immediately injected with a 20-gauge/ 32-mm catheter placed in the antecubital vein to obtain a bolus of air microbubbles. This procedure was performed 3 times during normal breathing and the same number of times during a Valsalva maneuver. The bolus of microbubbles was injected in 1 to 2 s when this 7-s period ended. We quantified the importance of right-toleft shunt by counting the number of signals in 1 middle cerebral artery within 7softheinjection, as previously reported (8). For intracardiac echocardiography (ICE), all the right atrial and interatrial septal characteristics other than PFO and mild ASA (1 right or 2 left by Olivares classification) (9) were recorded, including: prominent EV (defined as valve thickness 1 mm with at least 10-mm protrusion within the right atrium, as measured from the border of the inferior vena cava) (7), moderate-to-severe ASA (3 rightto-left, 3 left-to-right up to 5 right-to-left by Olivares classification) (9), and PFO diameter (as a mean of 2 measurements, obtained by measuring with the electronic caliper the maximum opening of the PFO in the enddiastolic frames in both the aortic valve and 4-chamber view planes). Patients who fulfilled the criteria for PFO closure underwent ICE evaluation with the mechanical 9-F, 9-MHz UltraICE catheter (EP Technologies, Boston Scientific Corporation, San Jose, California). The ICE study was conducted as previously described (10), by performing a manual pull-back from the superior vena cava to the inferior vena cava through 5 sectional planes; ICE monitoring of the implantation procedure was conducted in the 4-chamber plane (11). Migraine evaluation. Migraine with and without aura were diagnosed according to the International Headache Society criteria and Migraine Disability Assessment Score (12) as a part of clinical assessment of PFO. Closure protocol. Combined antibiotic therapy (gentamicin 80 mg ampicillin 1gorvancomycin 1gifallergy has been recorded on anamnesis) was administered intravenously 1 h before the procedure. The operators selected the Amplatzer Occluder family (PFO Occluder, Cribriform Occluder, AGA Medical Corporation, Golden Valley, Minnesota) or the Premiere Closure System (St. Jude Medical, Inc., St. Paul, Minnesota), on the basis of ICE study and the presence/absence of moderateto-large ASA and long tunnel-like PFO (tunnel length 12 mm). Follow-up protocol. Follow-up was conducted with TEE at 1 month (with repeat study at 6 months if at least a small shunt was detected); transthoracic echocardiography at 1, 6, and 12 months; TCD at 1 month; electrocardiographic Holter monitoring at 1 month; and combined cardiological Comparison and WithFunctional Permanent Comparison of Parameters Demographic and Valsalva-Induced ofbetween Demographic ClinicalPatients Shunt Clinical Table 1 and Functional Parameters Between Patients With Permanent and Valsalva-Induced Shunt Permanent (n 180) Valsalva (n 140) p Value Age (yrs) NS Female 128/180 (71.1%) 101/140 (72.1%) NS Smoking 89/180 (49.4%) 64/140 (45.7%) NS High blood pressure 29/180 (16.1%) 19/140 (13.5%) NS Hypercholesterolemia 32/180 (17.7%) 27/140 (19.2%) NS Oral contraception 54/180 (30%) 39/140 (27.8%) NS Deficiency of anti-thrombin 6/180 (3.3%) 3/140 (2.1%) NS III, C, S Factor V Leiden 5/180 (2.7%) 3/140 (2.1%) NS Mutation MTHFR (homozygote) 32/180 (17.7%) 27/140 (19.2%) NS Hyperhomocysteinemia 21/180 (11.6%) 15/140 (10.7%) NS Antiphospholipid or anticardiolipin antibodies 3/180 (1.6%) 2/140 (1.4%) NS Values are mean SD or n/n (%). MTHFR 5,10-methylen-tetraydrofolate reductase.
3 JACC Vol. 58, No. 21, 2011 November 15, 2011: Rigatelli et al. Defining a PFO High-Risk Population 2259 Comparison Anatomical With Permanent Parameters Comparison of Functional and With Between ofand Valsalva-Induced Functional Patients and Shunt Table 2 Anatomical Parameters Between Patients With Permanent and With Valsalva-Induced Shunt Permanent Valsalva p Value TEE PFO mean diameter (mm) ICE PFO mean diameter (mm) Shower shunt pattern TCD 9/180 (16.1%) 94/140 (67.1%) 0.01 Curtain shunt pattern TCD 151/180 (83.8%) 46/140 (32.8%) 0.01 Medium shunt TEE 32/180 (17.8%) 53/140 (37.8%) 0.01 Large shunt TEE 148/180 (82.2%) 87/140 (62.1%) 0.01 ASA 1 to 2 RL or LR 77/180 (42.7%) 68/140 (48.6%) NS ASA 3 to 5 RL or LR 81/180 (45%) 34/140 (24.3%) 0.01 EV/Chiari network 131/180 (72.7%) 45/140 (32.1%) 0.01 Values are mean SD or n/n (%). ASA atrial septal aneurysm; EV Eustachian valve; LR left-to-right; PFO patent foramen ovale; RL right-to-left; TCD transcranial Doppler; TEE transesophageal echocardiography. and neurological visit at 1, 6, and 12 months. Residual shunt was assessed by contrast TEE and TCD (13). Brain MRI was repeated at 12-month follow-up. Statistical analysis. Chi-square, analysis of variance, and Student t tests were used to compare frequencies and continuous variables between the groups. Stepwise logistic regression analysis was used to determine independent determinants of preoperative recurrent strokes. The analyzed variables were age 45 years, sex, moderate-to-severe ASA, shower pattern on TCD, curtain pattern on TCD, permanent shunt on TEE or TCD, medium-to-large shunt on TEE, and prominent EV. Statistical analysis was performed with a statistical software package (SAS for Windows, version 8.2, SAS Institute, Cary, North Carolina). A probability value of 0.05 was considered to be statistically significant. Results On both TCD and TEE, 180 patients (mean age years, 128 women) had permanent shunt (Permanent Shunt group) (Table 1), whereas 140 patients had only Valsalvainduced shunt (Valsalva Shunt group) (Table 1). Compared with the Valsalva Group, patients of Permanent Group more frequently had ASA and prominent EV (Table 2) and increased frequency of multiple ischemic brain lesions on MRI, previous recurrent stroke, previous peripheral arteries embolism, and migraine with aura (Fig. 1). No differences were recorded between the 2 groups with regard to procedure success, ischemic events recurrence, or new ischemic lesions appearance on brain MRI after the closure procedure; moreover, in the Permanent group residual shunts were more frequent at follow-up (Table 3). Multiple stepwise logistic regression analysis of enrolled baseline and clinical variables demonstrated that permanent shunt confers the highest risk of recurrent stroke (odds ratio: 5.9, 95% confidence interval: 2.0 to 12.0, p 0.001), whereas ASA (odds ratio: 3.9, 95% confidence interval: 0.5 to 7.0, p 0.001) was the only other strong independent predictor. Figure 1 Clinical Profile Comparison Between Permanent and Valsalva Shunt Patients Histogram representation of the comparison of clinical history between patients with permanent shunt and Valsalva-induced shunt. (Bottom) The nominal number of patients for each group. MRI magnetic resonance imaging; MwA migraine with aura; MwoA migraine without aura.
4 2260 Rigatelli et al. JACC Vol. 58, No. 21, 2011 Defining a PFO High-Risk Population November 15, 2011: Comparison Follow-Up PermanentResults and Comparison of Procedural With Between Valsalva-Induced ofand Procedural Patients With Shunt and Table 3 Follow-Up Results Between Patients With Permanent and With Valsalva-Induced Shunt Permanent Valsalva p Value Immediate success 180/180 (100%) 140/140 (100%) NS Recurrence of ischemic event 0/180 (0%) 0/140 (0%) NS New MRI lesions 0/180 (0%) 0/140 (0%) NS Complete occlusion 164/180 (91.1%) 133/140 (95%) NS Residual shunt small 14/180 (7.7%)* 3/180 (2.1%) Values are mean SD or n/n (%). *13 patients had a small shunt, and 1 patient had a moderate shunt. 2 patients had a small shunt, and 1 patient had a moderate shunt. MRI magnetic resonance imaging. Discussion Our study suggests that patients with permanent right-toleft shunt represent a subgroup at potentially higher risk of paradoxical embolism and that permanent right-to-left shunt can be considered an independent risk factor for recurrent paradoxical embolism. In addition, our data demonstrate that permanent right-to-left shunt being linked with ASA, in particular moderate or large might be related also with a higher proportion of residual shunts after closure, compared with patients with Valsalva-induced right-to-left shunt. Past and recent published reports have shown the contribution of shunt degree to be both enhanced and limited. A higher embolic risk has been reported with medium-tolarge shunts, particularly in association with migraine or coagulation abnormalities (14). Furthermore, TCD studies have correlated the shower or curtain shunt pattern with significant PFO on TEE (15) as well as history of paradoxical embolism. In further concordance with published reports, the higher frequency of large ASA and prominent EV in our study is closely linked to the presence and severity of spontaneous right-to-left shunt (16). More recently, the CODICIA (Right-to-Left Shunt in Cryptogenic Stroke) study (17) concluded that neither massive nor massive shunt associated with ASA was an independent risk factor for recurrent stroke. Unfortunately no mention was made about faith of patients with presence of permanent shunt in this study or in the study by Goel et al. (18), which clearly demonstrated that in symptomatic patients the PFO is associated with larger shunt and longer tunnel and more frequently with ASA. Permanent shunt usually corresponds to large shunt induced by Valsalva maneuver, but the correlation is not always linear in clinical practice: sometimes permanent shunt might correspond only to moderate (shower pattern) shunt after Valsalva: this might explain the mixed results observed in the aforementioned studies. We believe, by contrast, that permanent shunt is the most nonphysiological condition among the different flow pattern of right-to-left shunt: this hypothesis seems to be supported also by our previous studies, in which both ASA and permanent right-to-left shunt seemed correlated with a certain degree of left atrial dysfunction (19). The improvement of left atrial dysfunction when the permanent shunt was abolished after device closure in patients with a permanent shunt and ASA supports the role of permanent shunt in the pathophysiology of paradoxical embolism, even if a portion of ASA remains uncovered. The current study further confirmed this hypothesis and also the link between prominent EV and permanent shunt, a correlation already suggested by Schuchlens et al. (20). Conclusions To our knowledge, our study is the first systematic analysis evaluating the clinical and procedural implications of permanent right-to-left shunt. Further larger prospective studies probably should take into account that the presence and severity of spontaneous right-to-left shunt might be closely related to ASA and that prominent EV and large ASA might be potential markers of a high-risk profile for paradoxical embolism. Reprint requests and correspondence: Dr. Gianluca Rigatelli, Section of Adult Congenital Heart Disease, Cardiovascular Diagnosis and Endoluminal Interventions, Rovigo General Hospital, Viale Tre Martiri, Rovigo, Italy. jackyheart@ libero.it. REFERENCES 1. Rigatelli G, Dell Avvocata F, Cardaioli P, et al. 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5 JACC Vol. 58, No. 21, 2011 November 15, 2011: Rigatelli et al. Defining a PFO High-Risk Population Rigatelli G, Hijazi ZM. Intracardiac echocardiography in cardiovascular catheter-based interventions: different devices for different purposes. J Invasive Cardiol 2006;18: Stewart WF, Lipton RB, Whyte J, et al. An international study to assess reliability of the Migraine Disability Assessment (MIDAS) score. Neurology 1999;53: Boutin C, Musewe NN, Smallhorn JF, et al. Echocardiographic follow-up of atrial septal defect after catheter closure by doubleumbrella device. Circulation 1993;88: Rigatelli G, Dell Avvocata F, Giordan M, et al. Embolic implications of combined risk factors in patients with patent foramen ovale (the CARPE criteria): consideration for primary prevention closure? J Interv Cardiol 2009;22: Anzola GP, Morandi E, Casilli F, Onorato E. Does transcatheter closure of patent foramen ovale really shut the door? A prospective study with transcranial Doppler. Stroke 2004;35: Rigatelli G, Dell Avvocata F, Giordan M, Braggion G, Cardaioli P. Persistent venous valve correlate with increased shunt and multiple preceding cryptogenic embolic events in patients with patent foramen ovale: an intracardiac echocardiographic study. Catheter Cardiovasc Interv 2008;72: Serena J, Marti-Fabregas J, Santamarina E, et al., Stroke Project of the Cerebrovascular Diseases Study Group, Spanish Society of Neurology. Recurrent stroke and massive right-to-left shunt: results from the prospective Spanish multicentre (CODICIA) study. Stroke 2008;39: Goel SS, Tuzcu EM, Shishehbor MH, et al. Morphology of the patent foramen ovale in asymptomatic versus symptomatic (stroke or transient ischemic attack) patients. Am J Cardiol 2009;103: Rigatelli G, Aggio S, Cardaioli P, et al. Left atrial dysfunction in patients with patent foramen ovale and atrial septal aneurysm: an alternative concurrent mechanism for arterial embolism? J Am Coll Cardiol Intv 2009;2: Schuchlens HW, Saurer G, Weihs W, Rehak P. Persisting Eustachian valve in adults: relation with patent foramen ovale and cerebrovascular events. J Am Soc Echocardiography 2004;17: Key Words: cardiac anatomy y embolism y patent foramen ovale y stroke y thrombophilia.
JACC: CARDIOVASCULAR INTERVENTIONS VOL. 3, NO. 3, PUBLISHED BY ELSEVIER INC. DOI: /j.jcin
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