Cardiopulmonary bypass - wikipedia Cardiopulmonary bypass Cardiopulmonary bypass A heart -- lung machine ( upper right ) in a coronary artery bypass surgery. ICD - 9 - CM 39.61 MeSH D002318 OPS - 301 code 14 Other codes 22570829 ( edit on Wikidata ) Cardiopulmonary bypass ( CPB ) is a technique that temporarily takes over the function of the heart and lungs during surgery, maintaining the circulation of blood and the oxygen content of the patient 's body. The CPB pump itself is often referred to as a heart -- lung machine or `` the pump ''. Cardiopulmonary bypass pumps are operated by perfusionists. CPB is a form of extracorporeal circulation. Extracorporeal membrane oxygenation is generally used for longer - term treatment. Contents 1 Uses 1.1 Surgical procedures in which cardiopulmonary bypass is used 2 History 3 Components 3.1 Tubing 3.2 Pumps 3.2. 1 Roller pump 3.2. 2 Centrifugal pump 3.3 Oxygenator 3.4 Cannulae 3.5 Cardioplegia 4 Operation 5 Complications 6 References 7 External links Uses Illustration of one typical way that a heart - lung machine may be connected to the veins and arteries near the heart. The three implements on the left represent ( from top to bottom ) the pump, the oxygenator, and the reservoir. Cardiopulmonary bypass is commonly used in coronary bypass heart surgery because of the difficulty of operating on the beating heart. Operations requiring the opening of the chambers of the heart require the use of CPB to support the circulation during that period. The machine pumps the blood, and, using an oxygenator, allows red blood cells to pick up oxygen, as well as allowing carbon dioxide levels to decrease. This mimics the function of the heart and the lungs, respectively. CPB can be used for the induction of total body hypothermia, a state in which the body can be maintained for up to 45 minutes without perfusion ( blood flow ). If blood flow is stopped at normal body temperature, permanent brain damage normally occurs in three to four minutes -- death may follow shortly afterward. Similarly, CPB can be used to rewarm individuals suffering from hypothermia. Extracorporeal membrane oxygenation ( ECMO ) is a form of CPB sometimes used as life - support for newborns with serious birth defects, or to oxygenate and maintain recipients for organ transplantation until new organs can be found. CPB mechanically circulates and oxygenates blood for the body while bypassing the heart and lungs. It uses a heart -- lung machine to maintain perfusion to other body organs and tissues while the surgeon works in a bloodless surgical field. The surgeon places a cannula in right atrium, vena cava, or femoral vein to withdraw blood from the body. The cannula is connected to tubing filled with isotonic crystalloid solution. Venous blood that is removed from the body by the cannula is filtered, cooled or warmed, oxygenated, and then returned to the body. The cannula used to return oxygenated blood is usually inserted in the ascending aorta, but it may be inserted in the femoral artery. The patient is administered heparin to prevent clotting, and protamine sulfate is given after to reverse effects of heparin. During the procedure, hypothermia may be maintained ; body temperature is usually kept at 28 ° C to 32 ° C ( 82.4 -- 89.6 ° F ). The blood is cooled during CPB and returned to the body. The cooled blood slows the body 's basal metabolic rate, decreasing its demand for oxygen. Cooled blood usually has a higher viscosity, but the crystalloid solution used to prime the bypass tubing dilutes the blood. Surgical procedures in which cardiopulmonary bypass is used Coronary artery bypass surgery Cardiac valve repair and / or replacement ( aortic valve, mitral valve, tricuspid valve, pulmonic valve ) Repair of large septal defects ( atrial septal defect, ventricular septal defect, atrioventricular septal defect ) Repair and / or palliation of congenital heart defects ( Tetralogy of Fallot, transposition of the great vessels ) Transplantation ( heart transplantation, lung transplantation, heart -- lung transplantation ) Repair of some large aneurysms ( aortic aneurysms, cerebral aneurysms ) Pulmonary thromboendarterectomy Pulmonary thrombectomy History A heart lung machine used in London 's Middlesex Hospital in 1958. Science Museum, London ( 2008 ) An Austrian - German physiologist Maximilian von Frey constructed an early prototype of a heart - lung machine in 1885 at Carl Ludwig 's Physiological Institute of the University of Leipzig. However, such machines were not feasible before the discovery of heparin in 1916 which prevents blood coagulation. A Soviet scientist Sergei Brukhonenko developed a heart - lung machine for total body perfusion in 1926 which was used in experiments with canines. Dr. Clarence Dennis led the team that conducted the first known operation involving open cardiotomy with temporary mechanical takeover of both heart and lung functions on April 5, 1951 at the University of Minnesota Hospital. The patient did not survive due to an unexpected complex congenital heart defect. This followed four years of laboratory experimentation with dogs with a unit called the Iron Heart. A team of scientists at Birmingham University ( including Eric Charles, a Chemical Engineer ) were among the pioneers of this technology. Another member of the team was Dr. Russell M. Nelson, who performed the first open heart surgery in Utah. Brukhonenko 's Autojektor During the 1940s, a Russian scientist named Sergei Brukhonenko developed a machine called the Autojektor ( or Autojector ), capable of substituting the heart of a living organism. In a documentary entitled Experiments in the Revival of Organisms, which showed the Autojektor in use, the severed head of a canine was attached to the Autojektor. The Autojektor then supplied blood and oxygen to the head, keeping it in a basic level of consciousness. While the Autojektor was a primitive system, advanced versions of the technology it used can be found in modern ECMO machines. The first successful mechanical support of left ventricular function was performed in July 3, 1952 by Forest Dewey Dodrill using a machine, the Dodrill - GMR co-developed with General Motors. The machine was later used to support right ventricular function. The first successful open heart procedure on a human utilizing the heart lung machine was performed by John Gibbon on May 6, 1953 at Thomas Jefferson University Hospital in Philadelphia. He repaired an atrial septal defect in an 18 - year - old woman. Gibbon 's machine was further developed into a reliable instrument by a surgical team led by John W. Kirklin at the Mayo Clinic in Rochester, Minnesota in the mid-1950s. The oxygenator was first conceptualized in the 17th century by Robert Hooke and developed into practical extracorporeal oxygenators by French and German experimental physiologists in the 19th century. Bubble oxygenators have no intervening barrier between blood and oxygen, these are called ' direct contact ' oxygenators. Membrane oxygenators introduce a gas - permeable membrane between blood and oxygen that decreases the blood trauma of direct - contact oxygenators. Much work since the 1960s focused on overcoming the gas exchange handicap of the membrane barrier, leading to the development of high - performance microporous hollow - fibre oxygenators that eventually replaced direct - contact oxygenators in cardiac theatres. Components This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. ( June 2013 ) Cardiopulmonary bypass consists of two main functional units, the pump and the oxygenator which removes relatively oxygen - depleted blood from a patient 's body and replaces it with oxygen - rich blood through a series of tubes ( hoses ). Perfusionist operating a modern heart lung machine Tubing The components of the CPB circuit are interconnected by a series of tubes made of silicone rubber or PVC. Pumps Roller pump The pump console usually comprises several rotating motor - driven pumps that peristaltically `` massage '' tubing. This action gently propels the blood through the tubing. This is commonly referred to as a roller pump, or peristaltic pump. Centrifugal pump Many CPB circuits now employ a centrifugal pump for the maintenance and control of blood flow during CPB. By altering the speed of revolution ( RPM ) of the pump head, blood flow is produced by centrifugal force. This type of pumping action is considered to be superior to the action of the roller pump by many because it is thought to produce less blood damage ( hemolysis, etc. ), but mostly due to the centrifugal pump being pressure limited, therefore less likely to rupture the system if a sudden occlusion occurs on the high - pressure line system. Oxygenator The oxygenator is designed to add oxygen to infused blood and remove some of the carbon dioxide from the venous blood. Cardiac surgery was made possible by CPB using bubble oxygenators, but membrane oxygenators have supplanted bubble oxygenators since the 1980s. The main reasons for this are that membrane oxygenators tend to generate much fewer micro bubbles, referred to as gaseous microemboli, which is generally considered harmful to the patient and reduce damage to blood cells, compared to bubble oxygenators. Another type of oxygenator gaining favour recently is the heparin - coated blood oxygenator which is believed to produce less systemic inflammation and decrease the propensity for blood to clot in the CPB circuit. Cannulae Multiple cannulae are sewn into the patient 's body in a variety of locations, depending on the type of surgery. A venous cannula removes oxygen depleted venous blood from a patient 's body. An arterial cannula infuses oxygen - rich blood into the arterial system. A cardioplegia cannula delivers a cardioplegia solution to cause the heart to stop beating. Some commonly used cannulation sites : Venous Arterial Cardioplegia Right atrium Proximal aorta, distal to the cross-clamp Proximal aorta, proximal to the cross-clamp Vena cavae Femoral artery Coronary sinus ( retrograde delivery ) Femoral vein Axillary artery Coronary ostia Distal aorta Bypass grafts ( during CABG ) Apex of the heart Cardioplegia Main article : Cardioplegia A CPB circuit consists of a systemic circuit for oxygenating blood and reinfusing blood into a patient 's body ( bypassing the heart ) ; and a separate circuit for infusing a solution into the heart itself to produce cardioplegia ( i.e. to stop the heart from beating ), therefore providing myocardial protection ( i.e. to prevent death of heart tissue ). Operation A CPB circuit must be primed with fluid and all air expunged from the arterial line / cannula before connection to the patient. The circuit is primed with a crystalloid solution and sometimes blood products are also added. The patient must be fully anticoagulated with an anticoagulant such as heparin to prevent massive clotting of blood in the circuit. Complications CPB is not benign and there are a number of associated problems : Postperfusion syndrome ( also known as `` pumphead '' ) Hemolysis Capillary leak syndrome Clotting of blood in the circuit -- can block the circuit ( particularly the oxygenator ) or send a clot into the patient. Air embolism Leakage -- a patient can rapidly exsanguinate ( lose blood perfusion of tissues ) if a line becomes disconnected. 1.5 % of patients that undergo CPB are at risk of developing Acute Respiratory Distress Syndrome. As a consequence, CPB is only used during the several hours a cardiac surgery may take. Most oxygenators come with a manufacturer 's recommendation that they are only used for a maximum of 6 hours, although they are sometimes used for up to 10 hours, with care being taken to ensure they do not clot off and stop working. For longer periods than this, an ECMO ( extracorporeal membrane oxygenation ) is used, which can be in operation for up to 31 days -- such as in this Taiwanese case, for 16 days, after which the patient received a heart transplant. CPB may contribute to immediate cognitive decline. The heart - lung blood circulation system and the connection surgery itself release a variety of debris into the bloodstream, including bits of blood cells, tubing, and plaque. For example, when surgeons clamp and connect the aorta to tubing, resulting emboli may block blood flow and cause mini strokes. Other heart surgery factors related to mental damage may be events of hypoxia, high or low body temperature, abnormal blood pressure, irregular heart rhythms, and fever after surgery. References Jump up ^ McCullough, L. ; Arora, S. ( Dec 2004 ). `` Diagnosis and treatment of hypothermia. ''. Am Fam Physician. 70 ( 12 ) : 2325 -- 32. PMID 15617296. Jump up ^ Zimmer, Heinz - Gerd ( September 2003 ). `` The heart - lung machine was invented twice -- the first time by Max von Frey ''. Clinical cardiology. 26 ( 9 ) : 443 -- 5. ISSN 0160 - 9289. PMID 14524605. doi : 10.1002 / clc. 4960261011. Jump up ^ Dennis C ; Spreng DS ; Nelson GE ; et al. ( October 1951 ). `` Development of a Pump - oxygenator to Replace the Heart and Lungs : An Apparatus Applicable to Human Patients and Application to One Case ''. Ann. Surg. 134 ( 4 ) : 709 -- 21. PMC 1802968. PMID 14878382. doi : 10.1097 / 00000658 - 195110000 - 00017. Jump up ^ `` Iron Heart '' Pinch Hits The Real One by Paul F. Ellis February 1951 Popular Science Jump up ^ Norton, Jeffrey ( 2008 ). Surgery : Basic science and clinical evidence. NY : springer. p. 1473. ISBN 978 - 0 - 387 - 30800 - 5. Jump up ^ Cohn LH ( May 2003 ). `` Fifty years of open - heart surgery ''. Circulation. 107 ( 17 ) : 2168 -- 70. PMID 12732590. doi : 10.1161 / 01. CIR. 0000071746.50876. E2. Jump up ^ `` John Kirklin Cardiac Surgery Pioneer Dead at Age 86. '' ( April 23, 2004 ) University of Alabama at Birmingham. press release Jump up ^ Lim M ( 2006 ). `` The history of extracorporeal oxygenators ''. Anaesthesia. 61 ( 10 ) : 984 -- 95. PMID 16978315. doi : 10.1111 / j. 1365 - 2044.2006. 04781. x. Jump up ^ Pearson, D.T. ; Holden M ; Poslad S ; Murray A ; Waterhouse P. ( 1984 ). `` A clinical comparison of the gas transfer characteristics and gaseous microemboli production of one membrane and five bubble oxygenators : gas transfer characteristics and gaseous microemboli production ''. Perfusion. 1 ( 1 ) : 15 -- 26. doi : 10.1177 / 026765918600100103. Jump up ^ Pearson, D.T. ; Holden M ; Poslad S ; Murray A ; Waterhouse P. ( 1984 ). `` A clinical comparison of the gas transfer characteristics and gaseous microemboli production of one membrane and five bubble oxygenators : haemocompatibility ''. Perfusion. 1 ( 1 ) : 81 -- 98. doi : 10.1177 / 026765918600100103. Jump up ^ Man survives 16 days without a heart united Press International. April 3, 2008. Jump up ^ Stutz, Bruce `` Pumphead : Does the heart - lung machine have a dark side ? '' Scientific American, January 9, 2009. External links Wikimedia Commons has media related to Cardiopulmonary bypass. International Consortium For Evidence - Based Perfusion CircuitSurfers : A Perfusion Blog about Cardiopulmonary Bypass Hessel EA, Edmunds LH ( 2003 ). `` Extracorporeal Circulation : Perfusion Systems ''. In Cohn LH, Edmunds LH. Cardiac Surgery in the Adult. New York : McGraw - Hill. pp. 317 -- 38. Multimedia Manual of Cardiothoracic Surgery. Cardiopulmonary bypass collection. Profiles in Science : The Clarence Dennis Papers Selected papers of Clarence Dennis, credited with the first attempt at cardiopulmonary bypass surgery. Surgery and other procedures involving the heart ( ICD - 9 - CM V3 35 -- 37 + 89.4 + 99.6, ICD - 10 - PCS 02 ) Surgery and IC Heart valves and septa Valve repair Valvulotomy Mitral valve repair Valvuloplasty aortic mitral Valve replacement Aortic valve repair Aortic valve replacement Ross procedure Percutaneous aortic valve replacement Mitral valve replacement production of septal defect in heart enlargement of existing septal defect Atrial septostomy Balloon septostomy creation of septal defect in heart Blalock -- Hanlon procedure shunt from heart chamber to blood vessel atrium to pulmonary artery Fontan procedure left ventricle to aorta Rastelli procedure right ventricle to pulmonary artery Sano shunt compound procedures for transposition of great vessels Jatene procedure Mustard procedure for univentricular defect Norwood procedure Kawashima procedure shunt from blood vessel to blood vessel systemic circulation to pulmonary artery shunt Blalock -- Taussig shunt SVC to the right PA Glenn procedure Cardiac vessels CHD Angioplasty Bypass / Coronary artery bypass MIDCAB Off - pump CAB TECAB Coronary stent Bare - metal stent Drug - eluting stent Bentall procedure Valve - sparing aortic root replacement Other Pericardium Pericardiocentesis Pericardial window Pericardiectomy Myocardium Cardiomyoplasty Dor procedure Septal myectomy Ventricular reduction Alcohol septal ablation Conduction system Maze procedure Cox maze and minimaze Catheter ablation Cryoablation Radiofrequency ablation Pacemaker insertion Left atrial appendage occlusion Cardiotomy Heart transplantation Diagnostic tests and procedures Electrophysiology Electrocardiography Vectorcardiography Holter monitor Implantable loop recorder Cardiac stress test Bruce protocol Electrophysiology study Cardiac imaging Angiocardiography Echocardiography TTE TEE Myocardial perfusion imaging Cardiovascular MRI Ventriculography Radionuclide ventriculography Cardiac catheterization / Coronary catheterization Cardiac CT Cardiac PET sound Phonocardiogram Function tests Impedance cardiography Ballistocardiography Cardiotocography Pacing Cardioversion Transcutaneous pacing Vascular surgery ICD - 9 - CM V3 38 -- 39, ICD - 10 - PCS 03 -- 6 Vascular and Endovascular surgery Arterial disease Vascular bypass Angioplasty Atherectomy Endarterectomy Carotid endarterectomy Stenting Carotid stenting Venous disease Ambulatory phlebectomy Laser surgery Sclerotherapy Vein stripping Arterial and venous access Venous cutdown Arteriotomy Phlebotomy Aortic aneurysm / dissection : Endovascular aneurysm repair Open aortic surgery Other Cardiopulmonary bypass Cardioplegia Extracorporeal membrane oxygenation Vascular access Revascularization First rib resection Seldinger technique Vascular snare Medical imaging Angiography Digital subtraction angiography Cerebral angiography Aortography Fluorescein angiography Radionuclide angiography Magnetic resonance angiography Venography Portography Impedance phlebography Ultrasound Intravascular ultrasound Carotid ultrasonography Other diagnostic Angioscopy Ankle brachial pressure index Tilt table test GND : 4140707 - 6 Retrieved from `` https://en.wikipedia.org/w/index.php?title=Cardiopulmonary_bypass&oldid=791675032 '' Categories : Medical equipment American inventions German inventions Soviet inventions Hidden categories : Articles needing additional references from June 2013 All articles needing additional references Wikipedia articles with GND identifiers Talk Contents About Wikipedia Azərbaycanca Català Čeština Deutsch Español فارسی Français Gaeilge Հայերեն Italiano עברית ქართული Кыргызча മലയാളം Nederlands 日本 語 Norsk Norsk nynorsk Polski Русский Svenska Українська Edit links This page was last edited on 21 July 2017, at 19 : 37. 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Question: where are the cannula most commonly placed for cardiopulmonary bypass procedures
Answer: ascending aorta