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== Fontan Circulation ==
== Fontan Circulation ==
A normal heart system has a parallel circuit with the left ventricles pumping blood into the systemic system and the right ventricle pumping blood into the pulmonary system. This is different in the Fontan Circulation. In a Fontan Circulation, the two parallel circuits are turned into a single circuit in series because the vena cava are attached to the pulmonary artery.<ref>{{Cite journal |last=Gewillig |first=Marc |last2=Brown |first2=Stephen C |date=2016-07-15 |title=The Fontan circulation after 45 years: update in physiology |url=https://heart.bmj.com/lookup/doi/10.1136/heartjnl-2015-307467 |journal=Heart |language=en |volume=102 |issue=14 |pages=1081–1086 |doi=10.1136/heartjnl-2015-307467 |issn=1355-6037 |pmc=PMC4941188 |pmid=27220691}}</ref>
A normal heart system has a parallel circuit with the left ventricles pumping blood into the systemic system and the right ventricle pumping blood into the pulmonary system. This is different in the Fontan Circulation. In a Fontan Circulation, the two parallel circuits are turned into a single circuit in series because the vena cava are attached to the pulmonary artery.<ref>{{Cite journal |last=Gewillig |first=Marc |last2=Brown |first2=Stephen C |date=2016-07-15 |title=The Fontan circulation after 45 years: update in physiology |url=https://heart.bmj.com/lookup/doi/10.1136/heartjnl-2015-307467 |journal=Heart |language=en |volume=102 |issue=14 |pages=1081–1086 |doi=10.1136/heartjnl-2015-307467 |issn=1355-6037 |pmc=4941188 |pmid=27220691}}</ref>


== History ==
== History ==

Revision as of 00:35, 21 March 2023

Fontan or Fontan–Kreutzer procedure
Fontan procedure for tricuspid atresia
ICD-10-PCSZ98.890
ICD-9-CM35.94
MeSHD018729

The Fontan procedure or Fontan–Kreutzer procedure is a palliative surgical procedure used in children with univentricular hearts. It involves diverting the venous blood from the inferior vena cava (IVC) and superior vena cava (SVC) to the pulmonary arteries without passing through the morphologic right ventricle; i.e., the systemic and pulmonary circulations are placed in series with the functional single ventricle. The procedure was initially performed in 1968 by Francis Fontan and Eugene Baudet from Bordeaux, France, published in 1971, simultaneously described in 1971 by Guillermo Kreutzer from Buenos Aires, Argentina, and finally published in 1973.[1][2]

Indications

The Fontan Kreutzer procedure is used in pediatric patients who possess only a single functional ventricle, either due to lack of a heart valve (e.g. tricuspid or mitral atresia), an abnormality of the pumping ability of the heart (e.g. hypoplastic left heart syndrome or hypoplastic right heart syndrome), or a complex congenital heart disease where a bi-ventricular repair is impossible or inadvisable. The surgery allows blood to be delivered to the lungs via central venous pressure rather than via the right ventricle.[3] Patients typically present as neonates with cyanosis or congestive heart failure.[4] Fontan completion is usually carried out when the patient is 2–5 years of age, but is also performed before 2 years of age.[5][6]

Contraindications

After Fontan Kreutzer completion, blood must flow through the lungs without being pumped by the heart. Therefore, children with high pulmonary vascular resistance may not tolerate a Fontan procedure. Often, cardiac catheterization is performed to check the resistance before proceeding with the surgery. This is also the reason a Fontan procedure cannot be done immediately after birth; the pulmonary vascular resistance is high in utero and takes months to drop. Fontan procedure is also contraindicated in those with pulmonary artery hypoplasia, patients with left ventricular dysfunction and significant mitral insufficiency.[citation needed]

Types

There are four variations of the Fontan procedure:[7]

  • Ventricularization of the Right Atrium (The original Fontan's Technique)
  • Atriopulmonary connection (the original Kreutzer's Technique)
  • Intracardiac total cavopulmonary connection (lateral tunnel) (described by Marc De Leval and Aldo Castañeda, separately)
  • Extracardiac total cavopulmonary connection (described by Carlo Marceletti and Francisco Puga for Heterotaxy Syndrome)

Approach

Coronal CT image in a 19-year-old patient with tricuspid atresia treated with bidirectional Glenn shunt and Fontan.

The Fontan procedure is the third procedure in the staged surgical palliation.[8] It is performed in children born with congenital heart disease without two functional ventricles and an effective parallel blood flow circuit.[9]

The first stage is known as the Norwood procedure. This stage can generally involves combining the pulmonary artery and aorta to form a larger vessel for blood to get to the body. An artificial tube or shunt can be placed from this larger vessel to the pulmonary arteries so that blood can get from the heart to the lungs. The wall between the left and right atrium can be removed to allow the mixing of oxygenated and de-oxygenated blood.[10][11][12]

The second stage is called the hemi-Fontan or the Bidirectional Glenn procedure. This intermediary stage involves redirecting oxygen-poor blood from the top of the body to the lungs.[13] The superior vena cava (SVC), which carries blood returning from the upper parts of the body, is disconnected from the heart and instead redirects the blood into the pulmonary arteries.[13] The inferior vena cava (IVC), which carries blood returning from the lower body, continues to connect to the right atrium.[14][12]

The third stage is called the Fontan procedure which involves redirecting the blood from the IVC to the lungs.[8] At this point, the oxygen-poor blood from upper and lower body flows through the lungs without being pumped (driven only by the pressure that builds up in the veins or central venous pressure). This corrects the hypoxia and leaves the single ventricle responsible only for supplying blood to the body. There are currently three various techniques for the Fontan procedure which include: Atriopulmonary connection, lateral tunnel total cavopulmonary connection, and extracardiac conduit.[15]

Post-operative complications

In the short term, children can have trouble with pleural effusions (fluid building up around the lungs). This can require a longer stay in the hospital for drainage with chest tubes. To address this risk, some surgeons make a fenestration from the venous circulation into the atrium. When the pressure in the veins is high, some of the oxygen-poor blood can escape through the fenestration to relieve the pressure. However, this results in hypoxia, so the fenestration may eventually need to be closed by an interventional cardiologist.

Plastic bronchitis

In a 2016 review, Dr. Jack Rychik, head of the Single Ventricle Survivorship Program at Children's Hospital of Philadelphia summarized the long-term consequences of Fontan circulation as an "indolent and progressive state of heart failure" with predictable long-term consequences on several organ systems.[16] Chronic venous hypertension from the stasis and lowered cardiac output are assumed to be at the root of lymphatic complications such as chylothorax, protein losing enteropathy and plastic bronchitis. These complications may occur in the immediate post-operative period as well as in the medium and long term. New interventional and surgical strategies have been investigated to relieve the lymphatic complications associated with the Fontan circulation.[17] Concerns about damage to the liver have emerged more recently, as the Fontan circulation produces congestion and lymphedema in this organ. This can lead towards progressive hepatic fibrosis and other complications of Fontan-Associated Liver Disease.[18] Screening protocols and treatment standards are emerging in the light of these discoveries.[16]

Because of structural and electrochemical changes related to scarring after the procedure, arrhythmias are common. Pacemakers are placed in as many as 7% of patients who undergo the Fontan procedure.[19] While the need for pacemakers may be related to the underlying cardiac anomaly, there is sufficient evidence that the surgery itself lead to the need for cardiac pacing.

The Fontan procedure is palliative — not curative — but more than 80% of the cases can result in normal or near-normal growth, development, exercise tolerance, and good quality of life.[20] However, 10% or more of patients may eventually require heart transplantation,[21] and given the long-term consequences of chronic venous hypertension and insidious organ damage, freedom from morbidity is unlikely in the long term. New approaches to the management of failing Fontans or other clinical deterioration have included lymphatic decompression surgical procedures & intervention, Ventricular assist devices or other mechanical support therapies as either bridge to transplantation or destination therapies.[22]

It is estimated in 2018 there was an 85% for a survival rate of thirty years following a Fontan procedure and there are approximately 50,000 to 70,000 people in the world with Fontan circulation.[23]

Fontan Circulation

A normal heart system has a parallel circuit with the left ventricles pumping blood into the systemic system and the right ventricle pumping blood into the pulmonary system. This is different in the Fontan Circulation. In a Fontan Circulation, the two parallel circuits are turned into a single circuit in series because the vena cava are attached to the pulmonary artery.[24]

History

Francis Fontan (left) and Guillermo Kreutzer (right) in 2009

The Fontan procedure was initially described in 1971 by Dr. Francis Fontan (1929–2018) from Bordeaux, France. Prior to this, the surgical treatment for tricuspid atresia consisted of creating a shunt between a systemic artery and the pulmonary artery (Blalock-Taussig shunt) or the superior vena cava and the pulmonary artery (Glenn shunt). These procedures were associated with high mortality rates, commonly leading to death before the age of one year.[25] In an attempt to improve this, Fontan was engaged in research between 1964 and 1966 endeavouring to fully redirect flow from the superior and inferior vena cavae to the pulmonary artery.[26] His initial attempts in dogs were unsuccessful and all experimental animals died within a few hours; however, despite these failures, he successfully performed this operation in a young woman with tricuspid atresia in 1968 with Dr Eugene Baudet.[25] The operation was completed on a second patient in 1970, and after a third case the series was published in the international journal Thorax in 1971.[27] Dr. Guillermo Kreutzer from Buenos Aires, Argentina (b. 1934) without any knowledge of Fontan's experience performed a similar procedure in July, 1971 without placing a valve in the Inferior Vena Cava inlet and introducing the concept of "fenestration" leaving a small atrial septal defect to serve as a pop-off valve for the circulation.[28][25]

References

  1. ^ Fontan, F.; Baudet, E. (May 1971). "Surgical repair of tricuspid atresia". Thorax. 26 (3): 240–248. doi:10.1136/thx.26.3.240. ISSN 0040-6376. PMC 1019078. PMID 5089489.
  2. ^ Kreutzer, G.; Galíndez, E.; Bono, H.; De Palma, C.; Laura, J. P. (October 1973). "An operation for the correction of tricuspid atresia". The Journal of Thoracic and Cardiovascular Surgery. 66 (4): 613–621. doi:10.1016/S0022-5223(19)40598-9. ISSN 0022-5223. PMID 4518787.
  3. ^ Heaton J, Heller D (2021). "Single Ventricle". StatPearls. Treasure Island (FL): StatPearls Publishing. PMID 32491721. Retrieved 2021-08-18.
  4. ^ O'Leary PW (2002). "Prevalence, clinical presentation and natural history of patients with single ventricle". Progress in Pediatric Cardiology. 16: 31–38. doi:10.1016/s1058-9813(02)00042-5.
  5. ^ Hirsch JC, Goldberg C, Bove EL, Salehian S, Lee T, Ohye RG, Devaney EJ (September 2008). "Fontan operation in the current era: a 15-year single institution experience". Annals of Surgery. 248 (3): 402–10. doi:10.1097/SLA.0b013e3181858286. PMID 18791360. S2CID 12921302.
  6. ^ Anderson PA, Sleeper LA, Mahony L, Colan SD, Atz AM, Breitbart RE, et al. (July 2008). "Contemporary outcomes after the Fontan procedure: a Pediatric Heart Network multicenter study". Journal of the American College of Cardiology. 52 (2): 85–98. doi:10.1016/j.jacc.2008.01.074. PMC 4385517. PMID 18598886.
  7. ^ de Leval MR (April 2005). "The Fontan circulation: a challenge to William Harvey?". Nature Clinical Practice. Cardiovascular Medicine. 2 (4): 202–8. doi:10.1038/ncpcardio0157. PMID 16265484. S2CID 36129105.
  8. ^ a b Ohye, Richard G.; Schranz, Dietmar; D’Udekem, Yves (2016-10-25). "Current Therapy for Hypoplastic Left Heart Syndrome and Related Single Ventricle Lesions". Circulation. 134 (17): 1265–1279. doi:10.1161/circulationaha.116.022816. ISSN 0009-7322.
  9. ^ Rocha Martinez, Tania Leme da (2022-04-30). "Successful Palliation in Monochorionic Twins with Hypoplastic Left Heart Syndrome". Cardiology Research and Reports. 4 (4): 01–02. doi:10.31579/2692-9759/047. ISSN 2692-9759.
  10. ^ Schranz, Dietmar; Esmaeili, Anoosh; Akintuerk, Hakan (April 2021). "Hypoplastic Left Heart: Stage-I Will be Performed Interventionally, Soon". Pediatric Cardiology. 42 (4): 727–735. doi:10.1007/s00246-021-02597-y. ISSN 0172-0643.
  11. ^ Yabrodi, Mouhammad; Mastropietro, Christopher W. (2016-10-04). "Hypoplastic left heart syndrome: from comfort care to long-term survival". Pediatric Research. 81 (1–2): 142–149. doi:10.1038/pr.2016.194. ISSN 0031-3998.
  12. ^ a b Donnelly, Jon P.; Raffel, David M.; Shulkin, Barry L.; Corbett, James R.; Bove, Edward L.; Mosca, Ralph S.; Kulik, Thomas J. (January 1998). "Resting coronary flow and coronary flow reserve in human infants after repair or palliation of congenital heart defects as measured by positron emission tomography". The Journal of Thoracic and Cardiovascular Surgery. 115 (1): 103–110. doi:10.1016/s0022-5223(98)70448-9. ISSN 0022-5223.
  13. ^ a b Yuan, Shi-Min; Jing, Hua (June 2009). "Palliative procedures for congenital heart defects". Archives of Cardiovascular Diseases. 102 (6–7): 549–557. doi:10.1016/j.acvd.2009.04.011. ISSN 1875-2136.
  14. ^ van der Ven, Jelle P. G.; van den Bosch, Eva; Bogers, Ad J.C.C.; Helbing, Willem A. (2018-06-27). "State of the art of the Fontan strategy for treatment of univentricular heart disease". F1000Research. 7: 935. doi:10.12688/f1000research.13792.1. ISSN 2046-1402.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  15. ^ Walker, Sally M. (2005). Secrets of a Civil War submarine : solving the mysteries of the H.L. Hunley. Minneapolis: Carolrhoda Books. ISBN 1-57505-830-8. OCLC 56368642.
  16. ^ a b Rychik J (2016). "The Relentless Effects of the Fontan Paradox". Seminars in Thoracic and Cardiovascular Surgery. Pediatric Cardiac Surgery Annual. 19 (1): 37–43. doi:10.1053/j.pcsu.2015.11.006. PMID 27060041.
  17. ^ Hraska V, Hjortdal VE, Dori Y, Kreutzer C | title = Innominate vein turn-down procedure: Killing two birds with one stone | journal = Journal of Thoracic and cardiovascular Surgery Tech. 2021;7: | volume = 7 | issue = 1 | pages = 253-260 | date = Jun 2021 | pmid = 34318266 | doi =10.1016/j.xjtc.2021.01.045
  18. ^ Gordon-Walker TT, Bove K, Veldtman G (September 2019). "Fontan-associated liver disease: A review". Journal of Cardiology. 74 (3): 223–232. doi:10.1016/j.jjcc.2019.02.016. PMID 30928109.
  19. ^ Cohen, M. I.; Wernovsky, G.; Vetter, V. L.; Wieand, T. S.; Gaynor, J. W.; Jacobs, M. L.; Spray, T. L.; Rhodes, L. A. (1998-11-10). "Sinus node function after a systematically staged Fontan procedure". Circulation. 98 (19 Suppl): II352–358, discussion II358–359. ISSN 0009-7322. PMID 9852926.
  20. ^ Chan A, Aijaz A, Zaidi AN (March 2020). "Surgical outcomes in complex adult congenital heart disease: a brief review". Journal of Thoracic Disease. 12 (3): 1224–1234. doi:10.21037/jtd.2019.12.136. PMC 7139079. PMID 32274204.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  21. ^ McCormick AD, Schumacher KR (October 2019). "Transplantation of the failing Fontan". Translational Pediatrics. 8 (4): 290–301. doi:10.21037/tp.2019.06.03. PMC 6825971. PMID 31728322.{{cite journal}}: CS1 maint: unflagged free DOI (link)
  22. ^ Clift P, Celermajer D (December 2016). "Managing adult Fontan patients: where do we stand?". European Respiratory Review. 25 (142): 438–450. doi:10.1183/16000617.0091-2016. PMC 9487559. PMID 27903666.
  23. ^ Schilling, Chris; Dalziel, Kim; Nunn, Russell; Du Plessis, Karin; Shi, William Y.; Celermajer, David; Winlaw, David; Weintraub, Robert G.; Grigg, Leanne E.; Radford, Dorothy J.; Bullock, Andrew; Gentles, Thomas L.; Wheaton, Gavin R.; Hornung, Tim; Justo, Robert N. (September 2016). "The Fontan epidemic: Population projections from the Australia and New Zealand Fontan Registry". International Journal of Cardiology. 219: 14–19. doi:10.1016/j.ijcard.2016.05.035.
  24. ^ Gewillig, Marc; Brown, Stephen C (2016-07-15). "The Fontan circulation after 45 years: update in physiology". Heart. 102 (14): 1081–1086. doi:10.1136/heartjnl-2015-307467. ISSN 1355-6037. PMC 4941188. PMID 27220691.
  25. ^ a b c Cowgill LD (June 1991). "The Fontan procedure: a historical review". The Annals of Thoracic Surgery. 51 (6): 1026–30. doi:10.1016/0003-4975(91)91044-v. PMID 2039305.
  26. ^ Anderson RH (November 1999). "Francis Fontan". Cardiology in the Young. 9 (6): 592–600. doi:10.1017/s1047951100005631. PMID 10593269. S2CID 5073476.
  27. ^ Fontan F, Baudet E (May 1971). "Surgical repair of tricuspid atresia". Thorax. 26 (3): 240–8. doi:10.1136/thx.26.3.240. PMC 1019078. PMID 5089489.
  28. ^ Kreutzer G, Galíndez E, Bono H, De Palma C, Laura JP (October 1973). "An operation for the correction of tricuspid atresia". The Journal of Thoracic and Cardiovascular Surgery. 66 (4): 613–21. doi:10.1016/S0022-5223(19)40598-9. PMID 4518787.
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