NobleStitch Patent Foramen Ovales Closure for Recurrent Strokes in a Patient with COVID-19 on Extracorporeal Membrane Oxygenation

SEVERE HYPOXEMIA, secondary to the SARS-COV-2 (COVID-19) pneumonia, is a significant contributor to morbidity and mortality.1Kass M Arya VK Shah AH. COVID-19–positive patient and hypoxemia: Are lungs always to be blamed?.JACC Cardiovasc Interv. 2021; 14: e101-e102Crossref PubMed Scopus (1) Google Scholar Patent foramen ovales (PFOs) can exacerbate hypoxemia through an intracardiac shunt, slowing recovery and worsening outcomes.2Vanhomwegen C Taton O Selvais N et al.Patent foramen ovale revealed by COVID-19 pneumonia.BMC Pulm Med. 2021; 21: 126Crossref PubMed Scopus (2) Google Scholar, 3Rigatelli G Zuin M. Managing patent foramen ovale in COVID-19 patients during and after viral infection: An unresolved matter.J Cardiovasc Med (Hagerstown). 2021; 22: 259-260Crossref PubMed Scopus (1) Google Scholar, 4Rajendram R Kharal GA Mahmood N et al.Systemic thromboemboli in patients with COVID-19 may result from paradoxical embolization.Thromb Res. 2020; 196: 206-208Abstract Full Text Full Text PDF PubMed Scopus (4) Google Scholar Cryptogenic stroke is a complication commonly associated with PFOs; however, current guidelines do not address PFO management in COVID-19 patients who experience recurrent paradoxical emboli, especially in the setting of COVID-19 pneumonia, increased right-sided pressures, and a hypercoagulable state.3Rigatelli G Zuin M. Managing patent foramen ovale in COVID-19 patients during and after viral infection: An unresolved matter.J Cardiovasc Med (Hagerstown). 2021; 22: 259-260Crossref PubMed Scopus (1) Google Scholar,4Rajendram R Kharal GA Mahmood N et al.Systemic thromboemboli in patients with COVID-19 may result from paradoxical embolization.Thromb Res. 2020; 196: 206-208Abstract Full Text Full Text PDF PubMed Scopus (4) Google Scholar This report describes a challenging case of an unvaccinated patient with recurrent strokes and refractory hypoxemia secondary to COVID-19 pneumonia. The patient subsequently was found to have a PFO and underwent a PFO closure using NobleStitch EL (Heartstitch, Fountain Valley, CA). Approved by the Food and Drug Administration in 2019, NobleStitch is a suture-mediated approach enabling deviceless PFO closure (Fig 1).5Musuku SR Srikanthan A Cherukupalli D et al.NobleStitch EL PFO closure guided by transesophageal echocardiography.J Cardiothorac Vasc Anesth. 2022; 36: 549-552Abstract Full Text Full Text PDF PubMed Scopus (2) Google Scholar,6Gaspardone A De Marco F Sgueglia GA et al.Novel percutaneous suture-mediated patent foramen ovale closure technique: Early results of the NobleStitch EL Italian Registry.EuroIntervention. 2018; 14: e272-e279Crossref PubMed Scopus (29) Google Scholar Using percutaneous access, NobleStitch approximates the septum primum and the septum secundum using 2 polypropylene sutures and a single polypropylene knot, thereby avoiding the risks associated with septal occluders, such as infection, prolonged dual- antiplatelet therapy, arrhythmias, device erosion/dislodgment, and hindered left atrial access.5Musuku SR Srikanthan A Cherukupalli D et al.NobleStitch EL PFO closure guided by transesophageal echocardiography.J Cardiothorac Vasc Anesth. 2022; 36: 549-552Abstract Full Text Full Text PDF PubMed Scopus (2) Google Scholar,6Gaspardone A De Marco F Sgueglia GA et al.Novel percutaneous suture-mediated patent foramen ovale closure technique: Early results of the NobleStitch EL Italian Registry.EuroIntervention. 2018; 14: e272-e279Crossref PubMed Scopus (29) Google Scholar A previously healthy 42-year-old unvaccinated male presented to the hospital with a 2-day history of dyspnea, fever, and chills, and was diagnosed with COVID-19 infection. Initially, his condition was stable on high-flow nasal cannula, intravenous steroids as per protocol, and antiviral therapy including one 200-mg dose of remdesivir, one 810-mg dose of tocilizumab, and a 14-day course of 4 mg of baricitinib.7Tomazini BM Maia IS Cavalcanti AB et al.Effect of dexamethasone on days alive and ventilator-free in patients with moderate or severe acute respiratory distress syndrome and COVID-19: The CoDEX randomized clinical trial.JAMA. 2020; 324: 1307-1316Crossref PubMed Scopus (690) Google Scholar On inpatient day 4, the patient's oxygenation worsened, requiring escalation of respiratory and pharmacologic support. He subsequently was placed on bilevel positive airway pressure ventilation followed by endotracheal intubation on 100% FIO2 and positive end-expiratory pressure of 10 cmH2O. Due to refractory hypoxemia, the patient was transitioned to prone ventilation, inhaled epoprostenol therapy, and eventually placed on venovenous extracorporeal membrane oxygenation (VV-ECMO) support. One week later, the patient's hospital course was further complicated by an acute ischemic cerebrovascular accident. At that time, he was noted to have left arm and leg weakness with a right facial droop. Computed tomography (CT) of the head showed a hypodensity in the left medial cerebellum consistent with a subacute cerebellar infarct (Fig 2). The CT angiography revealed a thrombus occluding the V4 segment of the left vertebral artery, which is associated with the occlusion of the left posterior inferior cerebellar artery. Three days later, a repeat head CT revealed a hypodensity at the parietal-occipital junction raising concern for the evolution of the suspected infarction. Transthoracic echocardiography was performed, and a saline contrast injection revealed right-to-left shunting through a PFO, which was found to be <5mm (Fig 3 and Video 1). The patient's Risk of Paradoxical Emboli score was calculated to be 8, correlating to a causal risk of 84% from his PFO, with a 6% estimated risk of stroke recurrence at 2 years.8Elzanaty AM Patel N Sabbagh E et al.Patent foramen ovale closure in the management of cryptogenic stroke: A review of current literature and guideline statements.Curr Med Res Opin. 2021; 37: 377-384Crossref PubMed Scopus (6) Google Scholar Interventional cardiology subsequently was consulted for PFO closure due to repeated paradoxical thromboembolic events.Fig 3Transthoracic echocardiography bubble study demonstrating the presence of saline contrast (bubbles) in the left ventricle, diagnostic of a right-to-left intracardiac shunt through a patent foramen ovale.View Large Image Figure ViewerDownload Hi-res image Download (PPT) The patient was taken to the hybrid operating room for a transesophageal echocardiography assessment of his PFO. After an evaluation of the patient's PFO, it was concluded that closure with the suture-mediated deviceless NobleStitch would be the best course of action. This decision was made after considering multiple factors, including the patient's young age, the defect's likely amenability to repair based on prior publications, and his hypercoagulable state.6Gaspardone A De Marco F Sgueglia GA et al.Novel percutaneous suture-mediated patent foramen ovale closure technique: Early results of the NobleStitch EL Italian Registry.EuroIntervention. 2018; 14: e272-e279Crossref PubMed Scopus (29) Google Scholar If the patient were to require a transseptal puncture for a future procedure, the presence of a traditional closure device could be problematic. After femoral venous access was obtained, guidewires were placed into the superior vena cava and across the fossa ovalis into the left superior pulmonary vein (Video 1). Next, the NobleStitch secundum catheter (Fig 1) was advanced into the fossa ovalis, and the septum secundum was engaged and grasped. The needle was delivered through the septum secundum, and the device was withdrawn. The septum primum grasping arm was then advanced into the LA, the septum primum was grasped, and the needle was delivered. The grasping arm was then withdrawn, leaving behind 2 polypropylene sutures. Finally, the KwiKnot was advanced over the sutures and tension was applied using the catheter, effectively closing the PFO and resulting in a V-shaped indent or the “V sign” (Fig 4). The KwiKnot was deployed subsequently, the sutures were cut, the catheter was removed, and the knot was left behind in the right atrium. A schematic representation of these steps can be seen in Figure 5.Fig 5Schematic representation of the NobleStitch in closure of patent foramen ovale, demonstrating suture through the septum secundum, suture through the septum primum, suture pulling just prior to KwiKnot deployment, and suture tying using the KwiKnot.View Large Image Figure ViewerDownload Hi-res image Download (PPT) A postprocedural saline bubble study confirmed no residual intracardiac shunt (Video 1). On postoperative day 0, patient's VV-ECMO settings were set to 60% fraction of delivered oxygen (FdO2), with a flow rate of 3.6 L/min while on 50% FIO2 via mechanical ventilation. On postoperative day 8, FdO2 was lowered to 21% with a flow rate of 3.99 L/min and 40% FIO2. The patient was weaned off VV-ECMO completely on postoperative day 14. He ambulated shortly thereafter while still receiving oxygen therapy through a tracheal collar, and was discharged subsequently to outpatient rehabilitation where he continued to improve. Recent clinical trials have indicated that patients with cryptogenic stroke experience better outcomes and have a reduced risk of recurrent cryptogenic stroke when treated with percutaneous PFO closure in addition to antiplatelet or anticoagulant therapy compared to those treated with medication alone.9Giblett JP Williams LK Kyranis S et al.Patent foramen ovale closure: State of the art.Interv Cardiol. 2020; 15: e15Crossref PubMed Google Scholar A randomized controlled study comparing the rate of stroke recurrence in patients who underwent PFO closure with either Gore Helex or Cardioform septal occluders (Gore Medical, Newark, DE), combined with antiplatelet therapy (n = 441), as opposed to those treated with antiplatelet therapy alone (n = 223), discovered that the number needed to treat to prevent 1 stroke in 5 years was approximately 25, favoring PFO closure in patients with a history of cryptogenic stroke.10Kasner SE Rhodes JF Andersen G et al.Five-year outcomes of pfo closure or antiplatelet therapy for cryptogenic stroke.N Engl J Med. 2021; 384: 970-971Crossref PubMed Scopus (11) Google Scholar Another randomized controlled trial also compared PFO closure with the Abbott Amplatzer (Abbott Laboratories, Chicago, IL), in addition to medical management with antiplatelet or anticoagulant therapy (n = 60), and showed that PFO closure significantly reduced recurrence of stroke, vascular death, or major bleeding in the 2-year follow-up period compared to the medication group alone (n = 60), reporting a number needed to treat of 8.11Lee PH Song JK Kim JS et al.Cryptogenic stroke and high-risk patent foramen ovale: The DEFENSE-PFO trial.J Am Coll Cardiol. 2018; 71: 2335-2342Crossref PubMed Scopus (281) Google Scholar Although these occluders have shown to be efficacious, they can be complicated by increased device burden, device dislodgement, thrombosis, and can hinder left-sided cardiac procedures that may become necessary later in life, particularly in younger patients.1Kass M Arya VK Shah AH. COVID-19–positive patient and hypoxemia: Are lungs always to be blamed?.JACC Cardiovasc Interv. 2021; 14: e101-e102Crossref PubMed Scopus (1) Google Scholar,3Rigatelli G Zuin M. Managing patent foramen ovale in COVID-19 patients during and after viral infection: An unresolved matter.J Cardiovasc Med (Hagerstown). 2021; 22: 259-260Crossref PubMed Scopus (1) Google Scholar,4Rajendram R Kharal GA Mahmood N et al.Systemic thromboemboli in patients with COVID-19 may result from paradoxical embolization.Thromb Res. 2020; 196: 206-208Abstract Full Text Full Text PDF PubMed Scopus (4) Google Scholar,12Fisher HK. Hypoxemia in COVID-19 patients: An hypothesis.Med Hypotheses. 2020; 143110022Crossref PubMed Scopus (10) Google Scholar,13Ashraf M Sajed S. Acute stroke in a young patient with coronavirus disease 2019 in the presence of patent foramen ovale.Cureus. 2020; 12: e10233PubMed Google Scholar This can be especially pertinent in patients in a hypercoagulable state such as COVID-19 pneumonia. The role of PFO in refractory hypoxemia and cryptogenic stroke in patients with COVID-19 has often been overlooked, and there are currently no evidence-based recommendations regarding the management of these patients.3Rigatelli G Zuin M. Managing patent foramen ovale in COVID-19 patients during and after viral infection: An unresolved matter.J Cardiovasc Med (Hagerstown). 2021; 22: 259-260Crossref PubMed Scopus (1) Google Scholar,12Fisher HK. Hypoxemia in COVID-19 patients: An hypothesis.Med Hypotheses. 2020; 143110022Crossref PubMed Scopus (10) Google Scholar,14Nopp S Moik F Jilma B et al.Risk of venous thromboembolism in patients with COVID-19: A systematic review and meta-analysis.Res Pract Thromb Haemost. 2020; 4: 1178-1191Abstract Full Text Full Text PDF PubMed Scopus (235) Google Scholar Although COVID-19 can often present with thromboinflammation and a hypercoagulable state, right-to-left shunting through a PFO further increases the risk for paradoxical embolism, possibly due to the increased right atrial pressure in this population.1Kass M Arya VK Shah AH. COVID-19–positive patient and hypoxemia: Are lungs always to be blamed?.JACC Cardiovasc Interv. 2021; 14: e101-e102Crossref PubMed Scopus (1) Google Scholar,4Rajendram R Kharal GA Mahmood N et al.Systemic thromboemboli in patients with COVID-19 may result from paradoxical embolization.Thromb Res. 2020; 196: 206-208Abstract Full Text Full Text PDF PubMed Scopus (4) Google Scholar,12Fisher HK. Hypoxemia in COVID-19 patients: An hypothesis.Med Hypotheses. 2020; 143110022Crossref PubMed Scopus (10) Google Scholar This is a predicament in patients with a PFO in the setting of COVID-19 pneumonia, during which the increased right-sided pressures induce vascular damage, further activating the coagulation system and exacerbating the risk for paradoxical embolism.1Kass M Arya VK Shah AH. COVID-19–positive patient and hypoxemia: Are lungs always to be blamed?.JACC Cardiovasc Interv. 2021; 14: e101-e102Crossref PubMed Scopus (1) Google Scholar,4Rajendram R Kharal GA Mahmood N et al.Systemic thromboemboli in patients with COVID-19 may result from paradoxical embolization.Thromb Res. 2020; 196: 206-208Abstract Full Text Full Text PDF PubMed Scopus (4) Google Scholar,12Fisher HK. Hypoxemia in COVID-19 patients: An hypothesis.Med Hypotheses. 2020; 143110022Crossref PubMed Scopus (10) Google Scholar Moreover, the increased pulmonary pressures in these patients may be responsible for the refractory hypoxemia that is often seen.3Rigatelli G Zuin M. Managing patent foramen ovale in COVID-19 patients during and after viral infection: An unresolved matter.J Cardiovasc Med (Hagerstown). 2021; 22: 259-260Crossref PubMed Scopus (1) Google Scholar,4Rajendram R Kharal GA Mahmood N et al.Systemic thromboemboli in patients with COVID-19 may result from paradoxical embolization.Thromb Res. 2020; 196: 206-208Abstract Full Text Full Text PDF PubMed Scopus (4) Google Scholar In circumstances such as these, procedural correction of the PFO may both decrease right-to-left shunting, thereby improving oxygenation, and help prevent cryptogenic strokes.1Kass M Arya VK Shah AH. COVID-19–positive patient and hypoxemia: Are lungs always to be blamed?.JACC Cardiovasc Interv. 2021; 14: e101-e102Crossref PubMed Scopus (1) Google Scholar,4Rajendram R Kharal GA Mahmood N et al.Systemic thromboemboli in patients with COVID-19 may result from paradoxical embolization.Thromb Res. 2020; 196: 206-208Abstract Full Text Full Text PDF PubMed Scopus (4) Google Scholar,13Ashraf M Sajed S. Acute stroke in a young patient with coronavirus disease 2019 in the presence of patent foramen ovale.Cureus. 2020; 12: e10233PubMed Google Scholar NobleStitch provides a novel way of closing a PFO, which represents a significant source of embolic stroke and refractory hypoxemia.5Musuku SR Srikanthan A Cherukupalli D et al.NobleStitch EL PFO closure guided by transesophageal echocardiography.J Cardiothorac Vasc Anesth. 2022; 36: 549-552Abstract Full Text Full Text PDF PubMed Scopus (2) Google Scholar To the authors' knowledge, this report highlighted the first case of PFO closure in a COVID-19 patient using NobleStitch. Although the inclusion and exclusion criteria have not been elucidated explicitly by the device manufacturer or prescribed on FDA or CE mark documentation, the device is indicated broadly for PFO closure in patients with recurrent paradoxical ischemia. The device is not recommended in patients with inadequate septal tissue for the NobleStitch grasping arms/suturing, aortic or carotid artery disease, supraventricular and ventricular rhythm, multifenestrated septum, active endocarditis, atrial septal defect, or autoimmune disease.6Gaspardone A De Marco F Sgueglia GA et al.Novel percutaneous suture-mediated patent foramen ovale closure technique: Early results of the NobleStitch EL Italian Registry.EuroIntervention. 2018; 14: e272-e279Crossref PubMed Scopus (29) Google Scholar,15Gaspardone A Sgueglia GA De Santis A et al.Predictors of residual right-to-left shunt after percutaneous suture-mediated patent fossa ovalis closure.JACC Cardiovasc Interv. 2020; 13: 2112-2120Crossref PubMed Scopus (11) Google Scholar Furthermore, at this institution, PFO closure with NobleStitch is not performed in defect sizes >5 mm; however, previous studies described the potential for successful closure in these cases using multiple KwiKnots.6Gaspardone A De Marco F Sgueglia GA et al.Novel percutaneous suture-mediated patent foramen ovale closure technique: Early results of the NobleStitch EL Italian Registry.EuroIntervention. 2018; 14: e272-e279Crossref PubMed Scopus (29) Google Scholar,15Gaspardone A Sgueglia GA De Santis A et al.Predictors of residual right-to-left shunt after percutaneous suture-mediated patent fossa ovalis closure.JACC Cardiovasc Interv. 2020; 13: 2112-2120Crossref PubMed Scopus (11) Google Scholar Guided by transesophageal echocardiography (Video 1), this technique effectively closes the PFO by applying sutures through the septum primum and septum secundum, subsequently creating a knot between the 2 sutures and removing excess suture material, thereby avoiding many risks that accompany septal occluders.5Musuku SR Srikanthan A Cherukupalli D et al.NobleStitch EL PFO closure guided by transesophageal echocardiography.J Cardiothorac Vasc Anesth. 2022; 36: 549-552Abstract Full Text Full Text PDF PubMed Scopus (2) Google Scholar Hypercoagulable patients, such as those with COVID-19, may be at increased risk of thrombotic complications with traditional permanent implanted devices. Thus far, NobleStitch has shown promising results in terms of effectiveness, safety, and longevity.6Gaspardone A De Marco F Sgueglia GA et al.Novel percutaneous suture-mediated patent foramen ovale closure technique: Early results of the NobleStitch EL Italian Registry.EuroIntervention. 2018; 14: e272-e279Crossref PubMed Scopus (29) Google Scholar,15Gaspardone A Sgueglia GA De Santis A et al.Predictors of residual right-to-left shunt after percutaneous suture-mediated patent fossa ovalis closure.JACC Cardiovasc Interv. 2020; 13: 2112-2120Crossref PubMed Scopus (11) Google Scholar,16Scoccia A Laricchia A Ielasi A et al.TCT-479 Percutaneous suture-based closure of patent foramen ovale: Initial results of a multicenter experience in a highly selected population.J Am Coll Cardiol. 2021; 78: B197Crossref PubMed Google Scholar To improve patient selectivity, a retrospective observational study of 247 patients who underwent PFO closure with NobleStitch suggested new predictors of residual shunting after intervention. This study revealed improved outcomes with a preoperative PFO <5 mm in width and absence of a spontaneous right-to-left shunt, indicators that were both met in this patient.15Gaspardone A Sgueglia GA De Santis A et al.Predictors of residual right-to-left shunt after percutaneous suture-mediated patent fossa ovalis closure.JACC Cardiovasc Interv. 2020; 13: 2112-2120Crossref PubMed Scopus (11) Google Scholar Another prospective single-center study with a 6-month follow-up period (n = 116) investigated factors that may have contributed to a residual intracardiac shunting grade ≥2 (20%, n = 23), and revealed partial stitch detachment (n = 12), atrial septal tear (n = 3), and KwiKnot embolization (n = 2) as the main causes of right-to-left shunting at follow-up.17Zannoni J Popolo Rubbio A Tusa MB et al.Mechanisms of ineffective patent foramen ovale closure using the percutaneous suture-mediated NobleStitch system.EuroIntervention. 2022; 18: 68-70Crossref PubMed Scopus (3) Google Scholar Although the NobleStitch is not without complications, it has clear advantages over commonly used device PFO closures.5Musuku SR Srikanthan A Cherukupalli D et al.NobleStitch EL PFO closure guided by transesophageal echocardiography.J Cardiothorac Vasc Anesth. 2022; 36: 549-552Abstract Full Text Full Text PDF PubMed Scopus (2) Google Scholar,6Gaspardone A De Marco F Sgueglia GA et al.Novel percutaneous suture-mediated patent foramen ovale closure technique: Early results of the NobleStitch EL Italian Registry.EuroIntervention. 2018; 14: e272-e279Crossref PubMed Scopus (29) Google Scholar,17Zannoni J Popolo Rubbio A Tusa MB et al.Mechanisms of ineffective patent foramen ovale closure using the percutaneous suture-mediated NobleStitch system.EuroIntervention. 2022; 18: 68-70Crossref PubMed Scopus (3) Google Scholar This case highlighted how the NobleStitch procedure may be used to close a PFO in a COVID-19 patient with refractory hypoxemia and cryptogenic stroke on VV_ECMO. Particularly useful in younger patients, this deviceless system overcomes many of the complications associated with traditional PFO closure devices by averting risk of clot formation, future strokes, and need for long-term anticoagulation.6Gaspardone A De Marco F Sgueglia GA et al.Novel percutaneous suture-mediated patent foramen ovale closure technique: Early results of the NobleStitch EL Italian Registry.EuroIntervention. 2018; 14: e272-e279Crossref PubMed Scopus (29) Google Scholar,9Giblett JP Williams LK Kyranis S et al.Patent foramen ovale closure: State of the art.Interv Cardiol. 2020; 15: e15Crossref PubMed Google Scholar Given the ubiquity of COVID-19 and its complications, the early detection and treatment of PFO in patients with severe COVID-19 may prove important for timely recovery and prevention of serious sequelae.4Rajendram R Kharal GA Mahmood N et al.Systemic thromboemboli in patients with COVID-19 may result from paradoxical embolization.Thromb Res. 2020; 196: 206-208Abstract Full Text Full Text PDF PubMed Scopus (4) Google Scholar This is significant considering that congenital PFO affects approximately 25%-to-34% of the population3Rigatelli G Zuin M. Managing patent foramen ovale in COVID-19 patients during and after viral infection: An unresolved matter.J Cardiovasc Med (Hagerstown). 2021; 22: 259-260Crossref PubMed Scopus (1) Google Scholar,12Fisher HK. Hypoxemia in COVID-19 patients: An hypothesis.Med Hypotheses. 2020; 143110022Crossref PubMed Scopus (10) Google Scholar, and a recent cross-sectional study (n = 75) of patients under mechanical ventilation secondary to COVID-19 pneumonia found a 15% prevalence of PFOs in these patients.18Trifi A Ouhibi A Mahdi A et al.Shunt in critically ill Covid-19 ARDS patients: Prevalence and impact on outcome (cross-sectional study).J Crit Care. 2022; 70154048Crossref PubMed Scopus (2) Google Scholar Although most patients with a PFO do not require surgical intervention, selected patients may benefit from PFO closure to prevent recurrent cryptogenic strokes.19Shah R Nayyar M Jovin IS et al.Device closure versus medical therapy alone for patent foramen ovale in patients with cryptogenic stroke: A systematic review and meta-analysis.Ann Intern Med. 2018; 168: 335-342Crossref PubMed Scopus (58) Google Scholar Initial registry data (n = 192) have demonstrated that NobleStitch is a safe and effective method of PFO closure, revealing complete resolution of the right-to-left shunt in 75%, and a grade 1 residual right-to-left shunt in 14%.6Gaspardone A De Marco F Sgueglia GA et al.Novel percutaneous suture-mediated patent foramen ovale closure technique: Early results of the NobleStitch EL Italian Registry.EuroIntervention. 2018; 14: e272-e279Crossref PubMed Scopus (29) Google Scholar Although recent studies have begun to refine the inclusion criteria for this procedure to improve postprocedural residual shunting, long-term outcomes of this device will be better understood with the completion of the prospective multicenter clinical trial slated to conclude in 2026.15Gaspardone A Sgueglia GA De Santis A et al.Predictors of residual right-to-left shunt after percutaneous suture-mediated patent fossa ovalis closure.JACC Cardiovasc Interv. 2020; 13: 2112-2120Crossref PubMed Scopus (11) Google Scholar,17Zannoni J Popolo Rubbio A Tusa MB et al.Mechanisms of ineffective patent foramen ovale closure using the percutaneous suture-mediated NobleStitch system.EuroIntervention. 2022; 18: 68-70Crossref PubMed Scopus (3) Google Scholar,20Prospective multi center comparative parallel concurrent study of the NobleStitch EL compared to FDA approved amplatzer occluder device for closure of patent foramen ovale to prevent recurrent ischemic stroke. Available at: https://clinicaltrials.gov/ct2/show/NCT04339699?term=noblestitch&draw=2&rank=1. Accessed March, 2022.Google Scholar None. The authors would like to especially thank Dr Achille Gaspardone for his expertise on this topic as well as permitting us to use Figures 1 and 5. eyJraWQiOiI4ZjUxYWNhY2IzYjhiNjNlNzFlYmIzYWFmYTU5NmZmYyIsImFsZyI6IlJTMjU2In0.eyJzdWIiOiJiN2UwYTU2ZTMyZDZhNjE0ZTVkOGI2MjlhMTAxM2U4OCIsImtpZCI6IjhmNTFhY2FjYjNiOGI2M2U3MWViYjNhYWZhNTk2ZmZjIiwiZXhwIjoxNjgwMjU0NjM5fQ.YNugFfjduRDp76DaT77-ZrSzn39TJ-bSCboRCypZEssD_1jTzmFz9NSs0Pb1R0bHTR8txedOXNybeWZo9vDBVaCoJWjN6XChFWb8rGhd1jA5qd9kam9muZ64ipCJqf-YjD1jPGI9pBgx4cpVBwlMy8SHzO9MqGq5eS7K3AJRYs0zNCQ1yPxfsaN-qKSKkDhLkDDS-8xQb004idHmDdm6_yn28tmMAPFCQEEILTkvdCVHK0OVyydyX_eWnTILy5M9-Hohqos4aocsEp8NkBAkYzQO5sRQdnsu27vWt_RWcLQCr5s1KA61EOaAC9WkrTTuqw9gKYKGqhQaBhJJFJqOFg Download .mp4 (85.93 MB) Help with .mp4 files Video 1. Transthoracic echocardiography bubble study demonstrating the presence of saline contrast (bubbles) in the left ventricle, diagnostic of a right-to-left intracardiac shunt through a patent foramen ovale (PFO). Midesophageal (ME) bicaval view with and without color flow Doppler indicating a gap between the septum primum and secundum. ME bicaval view with and without color flow Doppler showing NobleStitch guidewires through the PFO to access the left atrium (LA). ME bicaval view with and without color flow Doppler demonstrating guidewires into the superior vena cava (SVC) and LA to grasp the septum secundum. Three-dimensional (3D) view of the wire crossing the PFO. ME bicaval view showing the NobleStitch catheter across the PFO into the LA, grasping the septum primum. ME bicaval views showing the KwiKnot application, joining the septum primum and secundum together. ME bicaval view showing the V-sign: a V-shaped indent on the septum primum, which reflects tension due to the NobleStitch KwiKnot. ME bicaval view 2D and 3D views showing the postprocedural bubble studies with absence of bubbles in the LA, indicating a successful closure.