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The usage of the Abiomed BVS 5000

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with 20 the updated report look ? Click here Close br br br br br br br br br br br br br br Information br br br br br br br Student Name br br br br Class br 2006 br br br Save report to 20 disk br br br br Student Email br br br br Submission br 77127 br br br Print version br br br br Title br br br br Submitted br 2006-11-16 16 :52 :36 20 EST br br br br br br br Matching br 2 20 br br br br ID br 513001 br br br br br br br br br br br br br br Suspected Sources br br br br br http /linkinghub .elsevier .com /retrieve /pii /S0 063X br br http /www .wanfangdata .com .cn /qikan /periodical .Articles /z rkxjz-e /zrkx2005 /0510 /051012 .htm br br br br br Re-process the without these 20 sources br br br br br br br br br br Text br br br br br Running 20 Head : THE USE OF ABIOMED 'S BVS 5000Running Head : THE USE OF ABIOMED 'S BVS 20 5000The Use of 20 Abiomed 's BVS 5000[Name of the writer][Name of the 20 institution]The Use 20 of Abiomed 's BVS 5000IntroductionThe treatment of cardiogenic failure with 20 mechanical circulatory assist devices has taken many 20 diverse directions since early attempts at extended 20 assist with the roller pump .1 Various devices have 20 evolved to sustain the circulation , each of which is 20 designed to meet a exceptional subset of needs for both 20 the patient and the physician . The BVS 5000 has been particularly 20 deliberated to provide biventricular , pulsatile assist 20 at a realistic cost and with a minimum of operational 20 difficulty . Meeting this 20 challenge requires pleasing the primary needs of the 20 patient with cardiogenic upset and of the clinical 20 personnel providing care . Accomplishment of these design goals has 20 prepared the BVS 5000 the most broadly used 20 biventricular support device since its clinical 20 introduction in 1987 (Edward , 2004 ) The keen efforts of 16 20 clinical investigators also made the BVS 5000 the first 20 circulatory support device to receive market approval 20 from the US Food and Drug Administration (FDA in 20 November 1992 .Tremendous progress has been made in the 20 management of acute cardiogenic shock , whether pre- or 20 postcardiotomy in nature . Medical management including antiplatelet 20 and lytic therapy , as well as interventional management 20 involving early angioplasty of culprit vessels has 20 resulted in the survival of patients who would otherwise 20 have died of cardiac failure (Louis et al , 2003 ) However , a subset of 20 patients remains challenging because of the incapability 20 to overturn cardiogenic shock or the sequelae of

inflexible arrhythmia that are so often linked with 20 myocardial damage . Irrespective of whether the low cardiac 20 output state happen before or after cardiac surgery , the 20 perception of mechanical support has become an 20 recognized method by which to administer patients 20 noncompliant to medical and interventional measures 20 Centers all over the world 20 have described the flexibility of the BVS 5000 in a 20 variety of situation , as well as right ventricular (RV 20 support after heart replacement (Gregory , 1999 and 20 implantable Left Ventricular Assist Device placement 20 left ventricular (LV 20 support after valve replacement (Song , 2003 Left 20 Ventricular aneurysmectomy (Mark , 2005 spontaneous 20 postpartum coronary artery dissection (Luckraz 2002 20 severe myocarditis (Louis , 2003 , severe myocardial 20 infarction , intractable arrhythmia (Mitamura 2001 , and 20 postinfarction ventricular septal failing An additional possible therapy 20 incorporates ventricular support for the damaged

ventricle after shock .A number of other benefits made this 20 device attractive . pulsatility , repeated console and the 20 facility to reverse anticoagulation entirely in the 20 first 24 hours of implantation . The advantages of pulsatility in the 20 situation of severe cardiogenic shock have been 20 explainedby Jett . as 20 disparate to chronic heart failure , enhanced end-organ 20 perfusion and better lymphatic flow with pulsatile 20 versus centrifugal flow is advantageous in severe shock 20 (Yano , 2003 ) In addition 20 the BVS is an asynchronous element such that the pump 20 productivity is a utility of preload and afterload and 20 is not reliant on cardiac rhythm , making support during 20 a life-threatening arrhythmia an option As outcomes of these benefits the device 20 has been well appreciated worldwide mostly in the United 20 States . Similarly remarkable 20 is the growth in the number of patients in whom this 20 support system has been implanted over the past decade 20 (Evgenij et al 20 2004 )The success of 20 the ABIOMED program has been the appreciation of quite a 20 few factors related with encouraging as well as adverse 20 results . The timing of 20 placing and appropriate patient choice is the two most 20 significant determinants of result . As the ABIOMED registry has revealed 20 wean and release rates can be doubled (40 vs 20 ) by 20 holding on to the principle of early placing 20 Over a number of years , the 20 timing of postcardiotomy shock placing has reduced from 20 6 hours to 3 hours from the first try to wean from CPB 20 In our estimation the 20 choice to implant can be made even before In fact , the decision is regularly made 20 closer than 60 minutes (Edward , 2004 ) After a trial of inotropic 20 drugs and IABP , grounding for device placing is made 20 immediately , thus wasting little time and often 20 preventing the necessity for biventricular support 20 In most of cases being with 20 univentricular failure , generally concerning the left 20 side (Louis et al , 2003 20 If this condition is not appropriate biventricular 20 failure arise . In to 20 begin with left ventircular support consistently , except 20 an isolated right ventricular trouble can be identified 20 with confidence . A Left 20 Ventricular Assist Device is positioned in , left atrial 20 and pulmonary artery pressures reduced , and the right 20 ventricle can generally be supported with low to

reasonable dose inotropic drugs (Yano , 2003 ) If the Left Ventricular 20 Assist Device flows are unsatisfactory , then an Right 20 Ventricular Assist Device is added . On exceptional circumstances both 20 cardiac and pulmonary malfunction has enforced the 20 alternative application of an in-line 20 oxygenator .A 20 remarkable change that has taken place is the function 20 of VAD technology to precardiotomy shock condition such 20 as acute myocarditis , severe myocardial infarction , and 20 intractable arrhythmia . Some 20 of the experiences with these situations and have been 20 impressed by the capability to support these patient 20 populations . Some of the 20 same understanding in postcardiotomy shock has now been 20 useful to precardiotomy shock . For example , the perception of maximal 20 inotropic drug support in the situation of the failing 20 ventricle has now been useful to patients in the

coronary care unit and cardiac catheterization 20 laboratory .One of 20 the most demanding issues with short-term mechanical 20 assist has been the incapability to forecast sustained 20 recovery . In some cases 20 there has been very successful decision of mechanism 20 explantation . Yet there is 20 a large distinction between the percentages of patients 20 successfully weaned versus successfully discharged 20 One of the authors Luckraz 20 (2002 ) has deliberated these reactions in persistently 20 supported patients and is now tring to do so in the 20 acute model . Although 20 histological transform favoring cell reprogramming have 20 been confirmed in the chronically discharged ventricle 20 supported with a long-term implantable Left Ventricular 20 Assist Device , it is indefinite whether these cellular 20 alteration can be determined in a shorter time period 20 and whether they can forecast continued functional 20 improvement (Edward 20 2004 )System 20 The BVS 20 5000 support system is a pulsatile ventricular assist 20 device competent of providing left , right or 20 biventricular support . The 20 system consists of singleuse blood pumps activated by a 20 pneumatic drive soothe . The 20 pump is positioned at the bedside . blood draw off from the patient 's left or 20 right atrium into the top of the pump and proceeds to 20 the patient 's aorta or pulmonary artery from the

underside of the pump . The 20 blood pump is dissimilar to any other ventricular assist 20 device in three key respects : 1 ) it is a dual-chamber 20 device that fits in an atrial (filling ) chamber and a 20 ventricular (pumping ) compartment . 2 ) unidirectional flow is guaranteed by 20 two trileaflet polyurethane regulator fabricated from 20 Angioflex , an ultrapure biomaterial and 3 ) system controls are fundamentally 20 limited to `on ' and `off (Evgenij et al , 2004 ) A well automated 20 control system continuously optimizes pump presentation 20 to adapt to varying patient 20 conditions .Dual-chamber designIn cooperation the atrial and ventricular 20 section include a smooth-surfaced polyurethane bladder 20 (volume 3D 100 ml . The 20 atrial chamber load passively from the patient through 20 pump systole and diastole . This dual-chamber design make constant 20 flow from the patient to the pump and pulsatile flow 20 from the pump reverse to the patient The patient 's heart is constantly 20 drained , even when the pump is expelling The ventricular chamber as a result 20 collapses and fills in reaction to delivery of dense air 20 from the console . The 20 constant drainage resulted by the action of the atrial 20 chamber also make simpler system operation and improve 20 safety (Louis et al , 2003 20 Vacuum is not required to assist filling with the 20 dual-chamber BVS blood pump . This reduces the operational complexities 20 related to controlling vacuum and decrease the risk of 20 atrial collapse and aspiration of air into the 20 system .Polyurethane 20 trileaflet valvesThe 20 polyurethane trileaflet regulator used in the BVS 5000 20 blood pump was at first developed by Lederman and 20 co-worker2 for use in implantable devices The valve is made-up from Angioflex , with 20 no closure between the valve leaflets and medium walls 20 At the rear of each leaflet 20 is a contoured sinus , which is deliberated to minimize 20 regurgitation on closing , cusp flapping during 20 midsystole , and the creation of thrombi in regions where 20 shear might alternatively be low . The unique grouping of mechanical 20 stability , haemodynamic performance and low cost made 20 these trileaflet valves perfect for the BVS 5000 20 The valve made feasible a 20 noteworthy reduction in the cost of the blood pump 20 comparative to competitive technologies using prosthetic 20 heart valves exclusive of compromising outstanding 20 performance .Control 20 systemSophisticated 20 computer technology and a closed-loop direct algorithm 20 designed by Bolt and coworkers , allow full mechanization 20 of the control system , with no direct electrical link to 20 the patient . The control 20 system supervises the flow of air to and from the blood 20 pumps all the way through the driveline tubing 20 Data concerning driveline 20 air flow gives vital information regarding blood pump 20 performance : blow volume (throughout pump systole ) and 20 ventricular bladder filling (throughout pump diastole 20 By constantly monitoring air 20 flow , the computer can precisely regulate the interval 20 of pump systole and diastole , pump beat rate and pump 20 flow (Edward 2004 ) These 20 factors are controlled to hold the flow of blood coming 20 from the patient and to retain the pump stroke volume 20 next to its intentional value of 80 ml The net product of this automation is a 20 system that wants only to be turned on Once the system is running , the medical 20 staff do not need to regulate timing , rate or flow 20 Clinicians need to be 20 alarmed only with sustaining suitable patient hydration 20 and proper pump height comparative to the patient 20 The pumps are normally 20 placed so that the top of the pump is 0-25 cm below the 20 height of the patient 's atria . The clinician may easily regulate pump 20 flow down through use of the weaning controls 20 Flow through each pump can 20 be separately decreased in addition of 0 .1 l /min from 20 the prevailing flow down to a least value of 0 .5 l /min 20 If the patient fails to 20 accept the reduced blood flow , the weaning method is 20 just turned off , and the pump routinely returns to the 20 full-flow operating approach (Evgenij et al 20 2004 )CannulationVascular entrance is done with 32 , 36 and 20 42 French , wire-reinforced cannulas The atrial cannula has a lighthouse tip 20 and is positioned through double purse-string sutures 20 straight into the left or right atrium Left atrial cannulation can be attained 20 behind the interatrial channel , through the left atrial 20 dome , or from the left atrial appendage Right atrial cannulation can be carried 20 out from the midfree wall or right atrial appendage 20 (Luckraz , 2002 The arterial 20 cannula integrates a 14 mm woven Dacron joins in place 20 of the lighthouse tip . The 20 graft 's outer walls are layered with an elastomer , which 20 significantly reduces interstitial blood loss and get 20 rid of the need for preclotting before inserting 20 The graft is to the 20 rising aorta or pulmonary artery by means of an 20 end-to-side anastomosis . The 20 cannulae are taken out subcostally in the course of 20 tunnels from the pericardial space through the skin 20 This subcostal 20 externalization is planned to allow sternal closure 20 A Dacron velour cover on the 20 outside of each cannula support haemostasis at the skin 20 outside .ComplicationsAs with all patients who need 20 postcardiotomy mechanical support , complications are 20 common . Mitamura (2001 20 reported 75 bleeding complications , 54 respiratory 20 failure , 52 renal failure , and 26 permanent neurologic 20 discrepancy . Infection took 20 place in 13 patients (28 ) while on the device but only 20 3 cases were considered device-related (Luckraz , 2002 ) Other complications 20 incorporated embolism in 13 , hemolysis in 17 and 20 mechanical problems associated to the atrial cannula 20 site in 13 of patients (Mark et , al 2005 ) No main changes in platelet count 20 or blood chemistries arise during the time of 20 circulatory support .Jett et al128 reported on 55 patients 20 maintained on the ABIOMED for a range of signs including 20 postcardiotomy stoppage (28 , failed transplant 20 allograft (8 , acute myocardial infarction (2 and 20 myocarditis (1 . They 20 reported a 40 occurrence of bleeding , 50 respiratory 20 difficulty , and 25 neurologic problem Ohashi (2003 ) also reported a related 20 occurrence of complications in 19 status I patients with 20 6 increasing renal failure , 9 explored for bleeding , and 20 3 dying of sepsis and multisystem organ malfunction 20 As with all severe

mechanical support systems , these comparatively high 20 complication rates are a indication of the significant 20 preexisting hemodynamic insult that occurs 20 necessitating implementation of mechanical support 20 (Luckraz , 2002 Early device 20 placment should be measured and may advance overall 20 outcome .ConclusionThe BVS 5000 was deigned to attend to the 20 needs of both the patient and the medical support team 20 This design advance has led 20 the BVS 5000 to turn out to be one of the most 20 extensively used pulsatile cardiac assist devices in the 20 world . Clinical practices 20 span various indications for use and engage many

investigators . Integrated in 20 the experience is a greatly controlled approaching 20 clinical trial , which has made available much insight 20 into the performance of the BVS 5000 and the aspect that 20 eventually influence success . As a result of this experience the BVS 20 5000 has turn out to be the first cardiac assist device 20 to obtain premarket approval in the USA The FDA 's act will make this life-saving 20 equipment accessible to all cardiac surgeons and their 20 patients . General use of the 20 BVS 5000 will not simply save lives , but will also 20 symbolize a significant step towards the definitive goal 20 of full heart replacement . The lessons we learn these days with the 20 BVS 5000 are priceless as we move further with the 20 progress of fully implantable systems In conclusion , the ABIOMED BVS 5000 has 20 had the benefit of more than a decade of outstanding 20 acceptance and appliance . The rate with which technology has 20 improved has resulted in the search of even better 20 devices for cardiac mechanical assist There is great expectation for compact 20 more competent devices for long-term support 20 Similarly stimulating is the 20 day of the completely implantable replacement heart 20 Acute cardiogenic shock 20 remains a medical confront that needs rapid respect and 20 recovery . We are at the 20 point at which we are starting to recognize the 20 technology for mutually pre- and postcardiotomy 20 shock .ABIOMED 's 20 AbioCor substitute heart has been designed to fully 20 maintain the body 's circulation necessities 20 The whole system consists of 20 an actual automatic pump assembly , which is implanted in 20 the chest in place of the unhealthy natural heart , and 20 its connected mechanism , that are implanted in the 20 front . This mechanism 20 includes the battery , an automatic control unit and a 20 transcutaneous power transmission system conveying 20 power from the external to the inside of the body 20 without skin penetration . The patient will take rechargeable 20 external batteries to operate the system and to recharge 20 the internal batteries .ReferencesEdward E . Berger ABIOMED 's BVS 5000 biventricular 20 support system The Journal of Heart and Lung 20 Transplantation , Volume 23 , Issue 5 , May (2004 Page 20 653Evgenij V 20 Potapov , Frank Merkle 20 Andreas GA1 /4ttel , Miralem Pasic , Michael Caleb 20 Michael Kopitz and Roland Hetzer Transcontinental 20 transport of a patient with an AbioMed BVS 5000 BVAD The 20 Annals of Thoracic Surgery , Volume 77 , Issue 4 (2004 20 Pages 1428-1430Gregory S . Couper , Rene J . Dekkers and David H Adams The logistics and 20 cost-effectiveness of circulatory support advantages of 20 the ABIOMED BVS 5000 The Annals of Thoracic Surgery 20 Volume 68 , Issue 2 (1999 , Pages 20 646-649Jett GK 20 ABIOMED BVS 5000 : experience and potential advantages 20 Ann Thorac Surg (1996 20 61 :301Louis E . Samuels , John C . Entwistle , III , Elena C Holmes , Ted Parris and Andrew S 20 Wechsler Mechanical support 20 of the unrepaired postinfarction ventricular septal 20 defect with the abiomed BVS 5000 ventricular assist 20 device Journal of Thoracic and Cardiovascular Surgery 20 Volume 126 , Issue 6 (2003 , Pages 20 2100-2101Luckraz H 20 Woods M , Large S .R . and 20 Papworth VAD Group , And hemolysis goes on ventricular 20 assist device in combination with veno-venous 20 hemofiltration , Ann Thorac Surg 73 (2002 , pp 20 546-548 .Mark B . Anderson , Juan M . Plate , Tyrone J . Krause and Peter M . Scholz Peripheral Arterial Cannulation for 20 Abiomed BVS 5000 Left Ventricular Assist Device Support 20 The Journal of Heart and Lung Transplantation Volume 20 24 , Issue 9 , September 2005 , Pages 20 1445 .e1-1445 .e3Mitamura 20 Y , Nakamura H . and Sekine 20 K . et al Prediction of 20 hemolysis in rotary blood pumps with computational fluid 20 dynamics analysis , J Congest Heart Fail Circ Support 4 20 (2001 , pp . 331-336 .Ohashi Y , de Andrade A and Nose Y , Hemolysis in an 20 electromechanical driven pulsatile artificial 20 heart , Artif Organs 27 (2003 , pp . 1089-1093 .Song X , Throckmorton A .L and Wood H .F . et al , Computational fluid dynamics 20 prediction of blood damage in a centrifugal pump , Artif 20 Organs 27 (2003 , pp . 938-941 .Yano T , Sekine K . and Mitoh A . et al , An estimation method of hemolysis 20 within an axial flow blood pump by computational fluid 20 dynamics analysis , Artif Organs 27 (2003 , pp 920-925 .1Abiomed 's BVS 20 br 5000 br br br br br br br br br Copyright C2 A9 2000 E2 80 932004 MyDropBox LLC . All rights 20 reserved C2 BB Usage 20 Agreement C2 BB Pr ivacy 20 Policy br

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MyDropBox

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