Left Ventricular Assist Device Outflow Cannula Obstruction Treated With Percutaneous Endovascular Stenting
2015; Lippincott Williams & Wilkins; Volume: 8; Issue: 1 Linguagem: Inglês
10.1161/circheartfailure.114.001891
ISSN1941-3297
AutoresJacob Abraham, Joshua D. Remick, Todd Caulfield, Mark Puhlman, Kathryn Evenson, Gary Y. Ott, Eric Kirker,
Tópico(s)Cardiac Arrest and Resuscitation
ResumoHomeCirculation: Heart FailureVol. 8, No. 1Left Ventricular Assist Device Outflow Cannula Obstruction Treated With Percutaneous Endovascular Stenting Free AccessResearch ArticlePDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessResearch ArticlePDF/EPUBLeft Ventricular Assist Device Outflow Cannula Obstruction Treated With Percutaneous Endovascular Stenting Jacob Abraham, MD, Joshua D. Remick, MD, Todd Caulfield, MD, Mark Puhlman, ANP, Kathryn Evenson, RN, Gary Ott, MD and Eric Kirker, MD Jacob AbrahamJacob Abraham From the Providence Heart and Vascular Institute, Portland, OR. , Joshua D. RemickJoshua D. Remick From the Providence Heart and Vascular Institute, Portland, OR. , Todd CaulfieldTodd Caulfield From the Providence Heart and Vascular Institute, Portland, OR. , Mark PuhlmanMark Puhlman From the Providence Heart and Vascular Institute, Portland, OR. , Kathryn EvensonKathryn Evenson From the Providence Heart and Vascular Institute, Portland, OR. , Gary OttGary Ott From the Providence Heart and Vascular Institute, Portland, OR. and Eric KirkerEric Kirker From the Providence Heart and Vascular Institute, Portland, OR. Originally published1 Jan 2015https://doi.org/10.1161/CIRCHEARTFAILURE.114.001891Circulation: Heart Failure. 2015;8:229–230Thrombosis within the circuit of a left ventricular assist device (LVAD) is a major complication imparting significant morbidity and mortality. Recent management algorithms emphasize anticoagulation or surgery for LVAD thrombosis, depending on clinical presentation.1 We report a case of thrombotic LVAD outflow cannula obstruction treated successfully with percutaneous endovascular stenting.Case AnecdoteA 72-year-old male underwent implantation of a HeartMate II left ventricular assist device (Thoratec, Pleasanton, CA) for end-stage dilated cardiomyopathy in December 2011. He had an uncomplicated course and returned to an active lifestyle. Thirty months later, he presented with intermittent low flow alarms, a mild decline in effort intolerance, and pedal edema.Echocardiography demonstrated normal LV dimensions and inability to close the aortic valve, despite increasing pump speed. Serum lactate dehydrogenase was 295 IU/L and plasma free hemoglobin 7.0 mg/dL. Chest X-ray showed an intact bend relief. Computed tomography angiogram demonstrated an acute angulation of the outflow graft and narrowing of the lumen of the outflow cannula from extensive thrombus (Figure 1A). Invasive hemodynamic monitoring demonstrated normal cardiac output and filling pressures, and angiography confirmed the outflow obstruction (Figure 2B).Download figureDownload PowerPointFigure 1. Thrombus formation (arrows) within the lumen of the left ventricular assist device outflow cannula proximal to a sharp bend visualized by computed tomography (A) and angiography (B).Download figureDownload PowerPointFigure 2. Intraoperative completion angiography demonstrates improved flow through the outflow graft stent (A). Follow-up computed tomography at 1 month shows well-positioned, overlapping stents (B).Given the patient's age and the inherent risks of reoperation, an endovascular approach was undertaken. After left brachial artery cut down and systemic anticoagulation, a Kumpe catheter (AngioDynamics, Queensbury, NY) was placed retrograde into the outflow graft. An Amplatzer wire was manipulated into the elbow of the LVAD. With the LVAD speed reduced to 6000 rpms, a 9×59 mm Atrium stent was deployed in the cannula. The stent was postdilated to 12 mm. A second overlapping stent was deployed and postdilated to address residual obstruction. Manual bilateral carotid occlusion was performed during stent delivery and balloon inflation to reduce the risk of cerebral embolization. LVAD flows immediately improved and completion angiography showed relief of cannula obstruction (Figure 2A). The patient tolerated the procedure well and was discharged 4 days later after reinstituting warfarin.A follow-up computed tomography scan 1 month later showed only mild residual thrombus (Figure 2B) with well-positioned stents. Echocardiography with speed adjustment showed normal device function and closure of the aortic valve at 10 000 rpms. The patient has had no further alarms and has returned to full physical activity.DiscussionThrombosis is increasingly recognized as a complication of continuous-flow LVADs.Outflow graft obstruction is readily diagnosed by computed tomography.2 Treatment guidelines recommend anticoagulation (heparin, thrombolytics, antiplatelet therapy) or surgery. Although endovascular stenting has previously been reported to treat outflow graft pseudoaneurysm,3 a rare complication, this report is the first to describe stenting to treat outflow graft thrombus. We hypothesize that with remodeling of the heart during LVAD support, the outflow graft became more angulated at its aortic anastomosis, causing low flow and thrombus formation.Because of the increasing use of LVADs as destination therapy in patients in whom intensified anticoagulation or reoperation may pose considerable risk, a percutaneous approach may represent a safe alternative.DisclosuresNone.FootnotesCorrespondence to Jacob Abraham, MD, 9427 SW Barnes Rd, Suite 498, Portland, OR 97225. E-mail [email protected]References1. Goldstein DJ, John R, Salerno C, Silvestry S, Moazami N, Horstmanshof D, Adamson R, Boyle A, Zucker M, Rogers J, Russell S, Long J, Pagani F, Jorde U. Algorithm for the diagnosis and management of suspected pump thrombus.J Heart Lung Transplant. 2013; 32:667–670. doi: 10.1016/j.healun.2013.05.002.CrossrefMedlineGoogle Scholar2. Mishkin JD, Enriquez JR, Meyer DM, Bethea BT, Thibodeau JT, Patel PC, Markham DW, Mammen PP, Velez-Martinez M, Drazner MH. 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Scandroglio A, Kaufmann F, Pieri M, Kretzschmar A, Müller M, Pergantis P, Dreysse S, Falk V, Krabatsch T and Potapov E (2016) Diagnosis and Treatment Algorithm for Blood Flow Obstructions in Patients With Left Ventricular Assist Device, Journal of the American College of Cardiology, 10.1016/j.jacc.2016.03.573, 67:23, (2758-2768), Online publication date: 1-Jun-2016. January 2015Vol 8, Issue 1 Advertisement Article InformationMetrics © 2015 American Heart Association, Inc.https://doi.org/10.1161/CIRCHEARTFAILURE.114.001891PMID: 25605641 Manuscript receivedOctober 28, 2014Manuscript acceptedNovember 14, 2014Originally publishedJanuary 1, 2015 Keywordsventricular assist devicePDF download Advertisement SubjectsCardiovascular SurgeryComputerized Tomography (CT)
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