Cardiothoracic surgery

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Cardiothoracic Surgeon
Ijn surgeon.JPG
Cardiothoracic surgeon performs an operation.
Occupation
Names
  • Physician
  • Surgeon
Occupation type
Specialty
Activity sectors
Medicine, Surgery
Description
Education required

Cardiothoracic surgery is the field of medicine involved in surgical treatment of diseases affecting organs inside the thorax (the chest)—generally treatment of conditions of the heart (heart disease) and lungs (lung disease). Cardiac surgery (involving the heart and great vessels) and thoracic surgery (involving the lungs) are separate surgical specialties, except in the USA, Australia, New Zealand and in some EU countries, such as the UK and Portugal.[1]

Training[edit]

A cardiac surgery residency typically comprises anywhere from 9 to 14 years (or longer) of training to become a fully qualified surgeon. Cardiac surgery training may be combined with thoracic surgery and / or vascular surgery and called cardiovascular (CV) / cardiothoracic (CT) / cardiovascular thoracic (CVT) surgery. Cardiac surgeons may enter a cardiac surgery residency directly from medical school, or first complete a general surgery residency followed by a fellowship. Cardiac surgeons may further sub-specialize cardiac surgery by doing a fellowship in a variety of topics including: pediatric cardiac surgery, cardiac transplantation, adult acquired heart disease, weak heart issues and many more problems in the heart.

Australia and New Zealand[edit]

The integrated advanced training program in Cardiothoracic Surgery is six years in duration with two of these years being devoted to experience in General Surgery, preferably during the first three years. Trainees having completed a training program in General Surgery and have obtained their FRACS will have the option to complete fellowship training in Cardiothoracic Surgery of four year in duration.

Canada[edit]

Historically, cardiac surgeons in Canada completed general surgery followed by a fellowship in CV / CT / CVT. During the 1990s, the Canadian cardiac surgery training programs changed to six-year "direct-entry" programs following medical school. The direct-entry format provides residents with experience related to cardiac surgery they would not receive in a general surgery program (e.g. echocardiography, coronary care unit, cardiac pathology, etc.). Contemporary Canadian candidates completing general surgery and wishing to pursue cardiac surgery often complete a cardiothoracic surgery fellowship in the United States. However, the Royal College of Physicians and Surgeons of Canada affords a three-year cardiac surgery fellowship for qualified general surgeons that is offered at several training sites including the University of Alberta, the University of British Columbia and the University of Toronto.

United States[edit]

Surgeon operating.

Cardiac surgery training in the United States is combined with thoracic surgery and called cardiothoracic surgery. A Cardiothoracic surgeon in the U.S. is a physician (D.O. or M.D.) who first completes a general surgery residency (typically 5–7 years), followed by a cardiothoracic surgery fellowship (typically 2–3 years). The cardiothoracic surgery fellowship typically spans two or three years, but certification is based on the number of surgeries performed as the operating surgeon, not the time spent in the program, in addition to passing rigorous board certification tests. Recently, however, options for an integrated 6-year cardiothoracic residency (in place of the general surgery residency plus cardiothoracic residency) have been established at several programs. Applicants match into these I-6 programs directly out of medical school, and the application process has been extremely competitive for these positions as there were approximately 160 applicants for 10 spots in the U.S. in 2010. As of May 2013, there are now 20 approved programs, which include the following:

University of California Los Angeles (UCLA) 2 resident positions, 1 Transplant Fellowship; 1 Congenital resident position

The American Board of Thoracic Surgery offers a special pathway certificate in congenital heart surgery which typically requires an additional year of fellowship. This formal certificate is unique because pediatric cardiac surgeons in other countries do not have formal evaluation and recognition of pediatric training by a licensing body.

Cardiac surgery[edit]

Cardiac surgery
Intervention
Coronary artery bypass surgery Image 657B-PH.jpg
Two cardiac surgeons performing a cardiac surgery known as coronary artery bypass surgery. Note the use of a steel retractor to forcefully maintain the exposure of the patient's heart.
ICD-9-CM 35-37
MeSH D006348
OPS-301 code: 5-35...5-37

The earliest operations on the pericardium (the sac that surrounds the heart) took place in the 19th century and were performed by Francisco Romero[2] Dominique Jean Larrey, Henry Dalton, and Daniel Hale Williams.[3] The first surgery on the heart itself was performed by Norwegian surgeon Axel Cappelen on the 4th of September 1895 at Rikshospitalet in Kristiania, now Oslo. He ligated a bleeding coronary artery in a 24 year old man who had been stabbed in the left axillae and was in deep shock upon arrival. Access was through a left thoracotomy. The patient awoke and seemed fine for 24 hours, but became ill with increasing temperature and he ultimately died from what the post mortem proved to be mediastinitis on the third postoperative day.[4][5] The first successful surgery of the heart, performed without any complications, was by Ludwig Rehn of Frankfurt, Germany, who repaired a stab wound to the right ventricle on September 7, 1896.[6][7]

Surgery in great vessels (aortic coarctation repair, Blalock-Taussig shunt creation, closure of patent ductus arteriosus), became common after the turn of the century and falls in the domain of cardiac surgery, but technically cannot be considered heart surgery. One of the more commonly known cardiac surgery procedures is the coronary artery bypass graft (CABG), also known as "bypass surgery." In this procedure, vessels from elsewhere in the patient's body are most commonly harvested using a procedure known as EVH, and grafted to the coronary arteries to bypass blockages and improve the blood supply to the heart muscle.

Early approaches to heart malformations[edit]

In 1925 operations on the heart valves were unknown. Henry Souttar operated successfully on a young woman with mitral stenosis. He made an opening in the appendage of the left atrium and inserted a finger into this chamber in order to palpate and explore the damaged mitral valve. The patient survived for several years[8] but Souttar’s physician colleagues at that time decided the procedure was not justified and he could not continue.[9][10]

Cardiac surgery changed significantly after World War II. In 1948 four surgeons carried out successful operations for mitral stenosis resulting from rheumatic fever. Horace Smithy (1914–1948) of Charlotte, revived an operation due to Dr Dwight Harken of the Peter Bent Brigham Hospital using a punch to remove a portion of the mitral valve. Charles Bailey (1910–1993) at the Hahnemann Hospital, Philadelphia, Dwight Harken in Boston and Russell Brock at Guy’s Hospital all adopted Souttar’s method. All these men started work independently of each other, within a few months. This time Souttar’s technique was widely adopted although there were modifications.[9][10]

In 1947 Thomas Holmes Sellors (1902–1987) of the Middlesex Hospital operated on a Fallot’s Tetralogy patient with pulmonary stenosis and successfully divided the stenosed pulmonary valve. In 1948, Russell Brock, probably unaware of Sellor’s work, used a specially designed dilator in three cases of pulmonary stenosis. Later in 1948 he designed a punch to resect the infundibular muscle stenosis which is often associated with Fallot’s Tetralogy. Many thousands of these “blind” operations were performed until the introduction of heart bypass made direct surgery on valves possible.[9]

Open heart surgery[edit]

Open heart surgery is a surgery in which the patient's heart is opened and surgery is performed on the internal structures of the heart. It was soon discovered by Wilfred G. Bigelow of the University of Toronto that the repair of intracardiac pathologies was better done with a bloodless and motionless environment, which means that the heart should be stopped and drained of blood. The first successful intracardiac correction of a congenital heart defect using hypothermia was performed by C. Walton Lillehei and F. John Lewis at the University of Minnesota on September 2, 1952. The following year, Soviet surgeon Aleksandr Aleksandrovich Vishnevskiy conducted the first cardiac surgery under local anesthesia. This surgery is during which the heart is exposed and the blood made to bypass it.

Surgeons realized the limitations of hypothermia – complex intracardiac repairs take more time and the patient needs blood flow to the body, particularly to the brain. The patient needs the function of the heart and lungs provided by an artificial method, hence the term cardiopulmonary bypass. John Heysham Gibbon at Jefferson Medical School in Philadelphia reported in 1953 the first successful use of extracorporeal circulation by means of an oxygenator, but he abandoned the method, disappointed by subsequent failures. In 1954 Lillehei realized a successful series of operations with the controlled cross-circulation technique in which the patient's mother or father was used as a 'heart-lung machine'. John W. Kirklin at the Mayo Clinic in Rochester, Minnesota started using a Gibbon type pump-oxygenator in a series of successful operations, and was soon followed by surgeons in various parts of the world.

Nazih Zuhdi performed the first total intentional hemodilution open heart surgery on Terry Gene Nix, age 7, on February 25, 1960, at Mercy Hospital, Oklahoma City, OK. The operation was a success; however, Nix died three years later in 1963.[11] In March, 1961, Zuhdi, Carey, and Greer, performed open heart surgery on a child, age 3½, using the total intentional hemodilution machine. In 1985 Zuhdi performed Oklahoma's first successful heart transplant on Nancy Rogers at Baptist Hospital. The transplant was successful, but Rogers, a cancer sufferer, died from an infection 54 days after surgery.[12]

Modern beating-heart surgery[edit]

Since the 1990s, surgeons have begun to perform "off-pump bypass surgery" – coronary artery bypass surgery without the aforementioned cardiopulmonary bypass. In these operations, the heart is beating during surgery, but is stabilized to provide an almost still work area in which to connect the conduit vessel that bypasses the blockage; in the U.S., most conduit vessels are harvested endoscopically, using a technique known as endoscopic vessel harvesting (EVH).

Some researchers believe that the off-pump approach results in fewer post-operative complications, such as postperfusion syndrome, and better overall results. Study results are controversial as of 2007, the surgeon's preference and hospital results still play a major role.

Minimally invasive surgery[edit]

A new form of heart surgery that has grown in popularity is robot-assisted heart surgery. This is where a machine is used to perform surgery while being controlled by the heart surgeon. The main advantage to this is the size of the incision made in the patient. Instead of an incision being at least big enough for the surgeon to put his hands inside, it does not have to be bigger than 3 small holes for the robot's much smaller "hands" to get through.

Pediatric cardiovascular surgery[edit]

Pediatric cardiovascular surgery is surgery of the heart of children.The first operations to repair heart defects in children were performed by Clarence Crafoord in Sweden when he repaired coarctation of the aorta in a 12 year old boy.[13] The first attempts to palliate congenital heart disease were performed by Alfred Blalock with the assistance of William Longmire, Denton Cooley, and Blalock's experienced technician, Vivien Thomas in 1944 at Johns Hopkins Hospital.[14] Techniques for repair of congenital heart defects without the use of a bypass machine were developed in the late 1940s and early 1950s. Among them was an open repair of an atrial septal defect using hypothermia, inflow occlusion and direct vision in a 5-year old child performed in 1952 by Lewis and Tauffe. C. Walter Lillihei used cross-circulation between a boy and his father to maintain perfusion while performing a direct repair of a ventricular septal defect in a 4 year old child in 1954.[15] He continued to use cross-circulation and performed the first corrections of tetratology of Fallot and presented those results in 1955 at the American Surgical Association. In the long-run, pediatric cardiovascular surgery would rely on the cardiopulmonary bypass machine developed by Gibbon and Lillehei as noted above. The first successful pediatric cardiac operation in Utah was performed by Russell M. Nelson at the Salt Lake General Hospital in March 1956, a total repair of tetralogy of Fallot in a four-year-old girl.[16]

Risks of cardiac surgery[edit]

The development of cardiac surgery and cardiopulmonary bypass techniques has reduced the mortality rates of these surgeries to relatively low ranks. For instance, repairs of congenital heart defects are currently estimated to have 4–6% mortality rates.[17][18] A major concern with cardiac surgery is the incidence of neurological damage. Stroke occurs in 5% of all people undergoing cardiac surgery, and is higher in patients at risk for stroke.[19] A more subtle constellation of neurocognitive deficits attributed to cardiopulmonary bypass is known as postperfusion syndrome, sometimes called "pumphead". The symptoms of postperfusion syndrome were initially felt to be permanent,[20] but were shown to be transient with no permanent neurological impairment.[21]

In order to assess the performance of surgical units and individual surgeons, a popular risk model has been created called the EuroSCORE. This takes a number of health factors from a patient and using precalculated logistic regression coefficients attempts to give a percentage chance of survival to discharge. Within the UK this EuroSCORE was used to give a breakdown of all the centres for cardiothoracic surgery and to give some indication of whether the units and their individuals surgeons performed within an acceptable range. The results are available on the CQC website.[22] The precise methodology used has however not been published to date nor has the raw data on which the results are based.

Infection represents the primary non-cardiac complication from cardiothoracic surgery. Infections can include mediastinitis, infectious myo- or pericarditis, endocarditis, cardiac device infection, pneumonia, empyema, and bloodstream infections. Clostridum difficile colitis can also develop when prophylactic or post-operative antibiotics are used.

See also[edit]

References[edit]

  1. ^ "Portuguese Ordem dos Médicos - Medical specialties" (in Portuguese). 
  2. ^ Aris A. Francisco Romero, the first heart surgeon. Ann Thorac Surg 1997 Sep;64(3):870-1. PMID 9307502
  3. ^ http://www.nlm.nih.gov/exhibition/aframsurgeons/pioneers.html Pioneers in Academic Surgery, , U.S. National Library of Medicine
  4. ^ Landmarks in Cardiac Surgery by Stephen Westaby, Cecil Bosher, ISBN 1-899066-54-3
  5. ^ http://www.tidsskriftet.no/?seks_id=659174
  6. ^ Absolon KB, Naficy MA (2002). First successful cardiac operation in a human, 1896: a documentation: the life, the times, and the work of Ludwig Rehn (1849-1930). Rockville, MD : Kabel, 2002
  7. ^ Johnson SL (1970). History of Cardiac Surgery, 1896-1955. Baltimore: Johns Hopkins Press. p. 5.
  8. ^ Dictionary of National Biography – Henry Souttar (2004–08)
  9. ^ a b c Harold Ellis (2000) A History of Surgery, page 223+
  10. ^ a b Lawrence H Cohn (2007), Cardiac Surgery in the Adult, page 6+
  11. ^ Warren, Cliff, Dr. Nazih Zuhdi – His Scientific Work Made All Paths Lead to Oklahoma City, in Distinctly Oklahoma, November, 2007, p. 30-33
  12. ^ http://ndepth.newsok.com/zuhdi Dr. Nazih Zuhdi, the Legendary Heart Surgeon, The Oklahoman, Jan 2010
  13. ^ Crafoord C, Nyhlin G. Congenital coarctation of the aorta and its surgical management J Thorac Surg 1945;14:347-361.
  14. ^ Blalock A, Taussig HB. The surgical treatment of malformations of the heart in which there is pulmonary stenosis or pulmonary atresia. JAMA 1948; 128: 189-202.
  15. ^ Lillehei CW, Cohen M, Warden HE, et al. The results of direct vision closure of ventricular septal defects in eight patients by means of controlled cross circulation. Surgery, Gynecology, and Obstetrics 1955; October: 447-66.
  16. ^ "Pediatric heart surgery" in MedlinePlus
  17. ^ Stark J, Gallivan S, Lovegrove J, Hamilton JR, Monro JL, Pollock JC, Watterson KG. Mortality rates after surgery for congenital heart defects in children and surgeons' performance. Lancet 2000 March 18;355(9208):1004-7. PMID 10768449
  18. ^ Klitzner TS, Lee M, Rodriguez S, Chang RR. Sex-related Disparity in Surgical Mortality among Pediatric Patients. Congenital Heart Disease 2006 May;1(3):77. Abstract
  19. ^ Jan Bucerius, Jan F. Gummert, Michael A. Borger,Thomas Walther, Nicolas Doll, Jorg F. Onnasch,Sebastian Metz, Volkmar Falk, Friedrich W. Mohr (2003). "Stroke after cardiac surgery: a risk factor analysis of 16,184 consecutive adult patients". The Annals of Thoracic Surgery 75 (2): 472–478. doi:10.1016/S0003-4975(02)04370-9. 
  20. ^ Newman M, Kirchner J, Phillips-Bute B, Gaver V, Grocott H, Jones R, Mark D, Reves J, Blumenthal J (2001). "Longitudinal assessment of neurocognitive function after coronary-artery bypass surgery". N Engl J Med 344 (6): 395–402. doi:10.1056/NEJM200102083440601. PMID 11172175. 
  21. ^ Van Dijk D, Jansen E, Hijman R, Nierich A, Diephuis J, Moons K, Lahpor J, Borst C, Keizer A, Nathoe H, Grobbee D, De Jaegere P, Kalkman C (2002). "Cognitive outcome after off-pump and on-pump coronary artery bypass graft surgery: a randomized trial". JAMA 287 (11): 1405–12. doi:10.1001/jama.287.11.1405. PMID 11903027. 
  22. ^ http://heartsurgery.cqc.org.uk/ CQC website for heart surgery outcomes in the UK for 3 years ending March 2009

External links[edit]