We present a technique of endovascular rheolytic thrombectomy using the AngioJet system for the treatment of acute pulmonary embolism. We describe the procedure in detail, suggesting the optimal catheter, wires and potential complications during the procedure. Recent advances in endovascular techniques, such as aspiration thrombectomy, endovascular thrombus fragmentation devices and rheolytic or rotational thrombectomy, suggest that the endovascular approach can represent an alternative for pharmacological thrombolysis and surgical embolectomy

Latacz, Paweł

Majewski, Eugeniusz

Piwowarczyk, Marek

Phlebological Review

English

Jagiellonian Univeristy Repository

Phlebological Review 2015106According to the American College of Chest Physi-cians (ACCP) guidelines [1], low-molecular weight hep-arin and fondaparinux are preferred treatment modali-ties for acute pulmonary embolism (PE). In addition, in selected patients these guidelines recommend throm-bolytic therapy: in patients presenting with an acute PE associated with hypotension and also patients who reveal a high risk of developing hypotension. Of note, patients managed with fibrinolytic agents should not have a high bleeding risk.Surgical embolectomy or endovascular removal of emboli can be an option in selected patients with sub-massive acute PE, especially those with emerging hemo-dynamic or respiratory instability. Also, patients who do not improve after thrombolysis should be considered for surgical or endovascular embolectomy. Recent advances in endovascular techniques, such as aspiration thrombec-tomy, endovascular thrombus fragmentation devices and rheolytic or rotational thrombectomy, suggest that the endovascular approach can represent an alternative for pharmacological thrombolysis and surgical embolecto-my. Endovascular treatment can be particularly advan-tageous when a  surgical procedure is not available or thrombolytic management is contraindicated [1-5].Importantly, endovascular procedures should be performed exclusively by doctors experienced with the techniques and armamentarium in this unique vascular territory.Interventionalists should be aware of the fact that severe complications, comprising severe bleeding, cardi-ac tamponade, cardiogenic shock and bradyarrhythmias, are likely to develop during the procedure, and the med-AbstrAct We present a technique of endovascular rheolytic thrombectomy using the AngioJet system for the treatment of acute pulmonary embolism. We describe the procedure in detail, suggesting the optimal catheter, wires and potential complications during the procedure. Recent advances in endovascular techniques, such as aspiration throm-bectomy, endovascular thrombus fragmentation devices and rheolytic or rotational thrombectomy, suggest that the endovascular approach can represent an alternative for pharmacological thrombolysis and surgical embolectomy.Key words: pulmonary embolism, endovascular thrombectomy, AngioJet.Phlebological Review 2015; 23, 4: 106–109DOI: 10.5114/pr.2015.59019Submitted:  16.11.2015Accepted:  30.12.2015ADDrEss FOr cOrrEsPONDENcEPaweł LataczDepartment of Vascular SurgeryUniversity Hospital, KrakowBotaniczna 3, 31-503 Krakowe-mail: pawlat@me.comtEchNicAl NOtEPaweł Latacz1, Eugeniusz Majewski2, Marek Piwowarczyk11Department of Vascular Surgery, University Hospital, Krakow, Poland2Faculty of Health Sciences, Medical University of Silesia, Katowice, PolandtEchNiquE OF ENDOvAsculAr rhEOlytic thrOmbEctOmy usiNg ANgiOJEt FOr trEAtmENt OF AcutE PulmONAry EmbOlismical team of the centre should be ready to manage these events. Dissection or perforation of the branches of the pulmonary artery with an endovascular device carries a high risk of fatal haemorrhage. Therefore, transcatheter embolectomy should be limited to the main pulmonary artery and lobar branches, since the risk of perforation significantly increases in vessels smaller than 6 mm [6-9].In this technical note we describe the suggested approach to the catheter-based pulmonary thrombecto-my using the rheolytic thrombectomy system AngioJet (Boston Scientific, Natick, MA, USA) [10].ENDOvAsculAr tEchNiquEFemoral access is the preferred route for this proce-dure. The femoral vein should be cannulated with a 5F or 6F introducer sheath. Then, over the standard (for example InQwire Guide Wire, Merit Medical Systems) or hydrophilic (for example: 0.035´ ´ AqWire, Covidien, ev3 Endovascular, Inc., Plymouth, MN, USA) guidewire a pigtail diagnostic catheter should be positioned in the pulmonary trunk. This diagnostic catheter should be advanced into each pulmonary artery and pulmonary angiography should be performed (Fig. 1). Approximate-ly 10-30 ml of contrast (the volume used should depend on the clinical status of the patient and the pulmonary pressure) is injected on each side. Injection of contrast should be followed by local administration of 5000 units of unfractionated heparin (the dose of heparin should be adjusted according to activated partial thromboplas-tin time and should be reduced if the drug has already been administered before the procedure). Once PE is Technique of endovascular rheolytic thrombectomy using AngioJet for treatment of acute pulmonary embolism107Phlebological Review 2015confirmed and a decision to address it using the rheolytic embolectomy is made, the introducer sheath should be replaced with a  bigger one, preferentially an 8F sheath. The embolus should be reached using a multipurpose 8F guiding catheter (the AngioJet system is compatible with 6F and 8F catheters). We suggest using the SiteSeer Jud-kins Right catheter (Medtronic, Minneapolis, MN, USA) or a long sheath with a special tip, such as the Destination Guiding Sheath (Terumo, Tokyo, Japan). Through this guiding catheter, over a  guidewire that should be navi-gated across the embolus (preferentially, a  hydrophilic Fig. 1. Initial angiography of the pulmonary arteries in a patient with pulmonary embolism (RPA – right pulmonary artery)Fig. 3. Recanalisation of the middle branch of the right pulmo-nary artery after use of the AngioJet systemFig. 2. Introduction of AngioJet system into the middle branch of the right pulmonary artery Fig. 4. Residual thrombi in the upper branch of the right pul-monary artery (RPA)Fig. 5. Introduction of AngioJet system into the upper branch of the right pulmonary arteryPaweł Latacz, Eugeniusz Majewski, Marek PiwowarczykPhlebological Review 2015108one, still advanced carefully), the AngioJet system (Bos-ton Scientific, Natick, MA, USA) is introduced (Fig. 2). Using this endovascular device the emboli should be sub-sequently aspired from all occluded branches (Figs. 3-6). In general, embolectomy should be discontinued as soon as the patient’s haemodynamic status stabilizes, even if the angiographic result is not perfect. As emphasized in the introduction, embolectomy of small branches of the pulmonary artery should be avoided, because naviga-tion through these tiny vessels dramatically increases the risk of haemorrhage. If the above-described attempts to restore the patency of pulmonary arteries are not effec-tive, direct local administration of a fibrinolytic agent (on condition that there are no contraindications for such treatment, especially intraprocedural injury of the artery) may be helpful. During aspiration of embolic materi-al dyspnoea and cardiac decompensation can develop, especially if an aspiration lasts longer than 7-10 s. Thus, longer use of the AngioJet system should be avoided. Also, during the procedure some patients may develop bradyarrhythmias. Therefore, some authors recommend insertion of a  temporary transvenous pacemaker. Care-ful preprocedural assessment of the patient should reveal whether such a pacemaker is indeed necessary. It should also be remembered that hemodynamic instability seen in PE patients, especially right ventricle overload, is not Fig. 6. Final result of the procedure in this patient (RPA – right pulmonary artery)solely related to mechanical occlusion of pulmonary arteries, but also is associated with vasoconstriction of the pulmonary vasculature. Although the exact mech-anism of such vasoconstriction in the setting of PE has not yet been elucidated, it is thought that haemolysis resulting from PE itself and also from pharmacological treatment with fibrinolytic agents reduces the concentra-tion of nitric oxide (NO) in the pulmonary circulation through scavenging of NO by cell-free haemoglobin [11].Perhaps other vasoactive substances, such as adeno-sine and bradykinin, may also play a  role in the devel-opment of pulmonary vasoconstriction. Furthermore, severe haemolysis can lead to significant hyperkalaemia and also induce renal failure, which should be considered when managing PE patients.The authors declare no conflict of interest.references1. 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Technique of endovascular rheolytic thrombectomy using AngioJet for treatment of acute pulmonary embolism

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Technique of endovascular rheolytic thrombectomy using AngioJet for treatment of acute pulmonary embolism

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