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PubMed This is a summary of 23 peer-reviewed journal articles Updated
Cardiology

Lifelong Surveillance & Your Care Team

At a Glance

After Fontan surgery, children with a univentricular heart need lifelong, individualized follow-up. Regular heart tests, exercise assessment, liver monitoring, rhythm checks, and a planned transition to adult congenital heart care can identify problems early.

While the Fontan procedure is a major milestone, it is the beginning of a lifelong journey of specialized care. Because the Fontan circulation is a “passive” system that places unique stress on the heart, liver, and lungs, the focus shifts from acute surgery to lifelong surveillance [1][2].

The goal of this monitoring is to catch small changes before they become severe symptoms. This is managed through a “surveillance-testing toolkit”—a set of regular checks designed specifically for the single-ventricle heart [1][3].

The Surveillance Toolkit: What to Expect

Surveillance frequency, the types of tests used, and decisions about sedation or contrast vary by age, individual anatomy, and evolving medical guidelines. Your team will tailor a schedule to your child. Tests may include [1]:

  • Echocardiogram: Often used routinely to check how well the single ventricle is squeezing and whether the heart valves are leaking (regurgitation) [4].
  • Cardiac MRI (CMR): Provides a detailed, 3D map of the heart and its connections [5]. Depending on the center and the child, your team may recommend a CMR periodically (e.g., every few years) to check for narrow spots in the Fontan pathway that an echo might miss [6].
  • Cardiopulmonary Exercise Test (CPET): As your child grows, they may perform a “stress test” on a bike or treadmill. This measures how their heart and lungs work together under pressure, helping doctors track their “functional capacity” over time [7][8].
  • Cardiac Catheterization: Not typically a routine yearly test, but ordered when doctors need exact internal pressure measurements or if they need to intervene with a stent or a coil [9][10].

Monitoring the “Fontan Liver”

Because the liver is sensitive to the higher pressure of the Fontan circulation, regular “liver wellness” checks are a standard part of care [11][12].

  • Imaging: Your child will likely have a liver ultrasound or MRI periodically (often every 1 to 3 years) to check the liver’s texture and size [13][14].
  • Bloodwork & Hepatology: Regular labs will check liver enzymes and platelet counts. If a child develops advanced fibrosis or cirrhosis, surveillance becomes more frequent and specialized (such as Alpha-fetoprotein tests for cancer screening), and a hepatologist (liver specialist) will closely manage their care [15][16][17][18].

Building the “Village” of Specialists

Your child’s care team will evolve as their needs change. A comprehensive Fontan team may include:

  • The ACHD Specialist: An Adult Congenital Heart Disease cardiologist. Transitioning to ACHD care is critical as your child reaches adulthood [19][3].
  • The Electrophysiologist: A “heart rhythm” doctor who monitors for arrhythmias [20][21].
  • Advanced Heart Failure/Transplant Specialists: Most stable Fontan patients do not need an established transplant relationship. However, if there are signs of ventricular or Fontan deterioration, referral to these specialists ensures you have the best advanced options available [19][22].

Why the “Adult” Transition Matters

One of the most important steps in your child’s life will be the transition from pediatric to adult care. This transition should begin gradually during adolescence—helping your teen learn about their diagnosis, manage medications, and eventually book their own appointments.

It is vital that they eventually transfer to an ACHD specialist rather than a general adult cardiologist [23][3]. General cardiologists primarily treat older adults with heart attacks or high blood pressure and may not recognize the subtle signs of a failing Fontan. ACHD specialists are specifically trained to care for the “passive” circulation of a single ventricle, protecting your child’s health for decades to come [19][23].

Common questions in this guide

What tests are used to monitor a child after Fontan surgery?
Follow-up may include echocardiograms to check pumping and valve leakage, cardiac MRI to map the Fontan pathway, and exercise testing as the child grows. Cardiac catheterization is usually reserved for situations that require precise pressure measurements or a procedure such as a stent or coil.
How is the liver monitored after Fontan surgery?
Monitoring commonly includes periodic liver ultrasound or MRI plus blood tests for liver enzymes and platelet counts. If fibrosis or cirrhosis develops, checks become more frequent and may include cancer screening and care from a liver specialist.
Why does Fontan circulation require lifelong surveillance?
Fontan circulation sends blood to the lungs without a normal pumping ventricle, so it places unusual pressure demands on the heart, liver, and lungs. Regular monitoring can help the care team find changes before they cause severe symptoms.
When should a child transition to an adult congenital heart specialist?
Transition planning should begin gradually during adolescence, with education about the diagnosis, medicines, appointments, and self-management. By adulthood, care should transfer to an Adult Congenital Heart Disease specialist rather than a general adult cardiologist.
Which specialists may care for someone with Fontan circulation?
The team may include a congenital heart cardiologist, an electrophysiologist for rhythm problems, and a hepatologist for liver disease. Advanced heart failure or transplant specialists may become involved if the ventricle or Fontan circulation shows signs of deterioration.

Questions For You

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Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.What specific surveillance tests (like MRI or liver ultrasound) do you recommend for my child at their current age and health status?
  2. 2.When should we schedule my child's first cardiac MRI, and what is the plan for doing it without sedation as they get older?
  3. 3.What is my child's current exercise capacity on their last CPET, and how does that compare to what you expect for their age?
  4. 4.What is our center's protocol for monitoring for Fontan-Associated Liver Disease (FALD)?
  5. 5.At what age do you typically begin the formal transition education process to an Adult Congenital Heart Disease (ACHD) specialist?

References

References (23)
  1. 1

    Evaluation and Management of the Child and Adult With Fontan Circulation: A Scientific Statement From the American Heart Association.

    Rychik J, Atz AM, Celermajer DS, et al.

    Circulation 2019; (140(6)):e234-e284 doi:10.1161/CIR.0000000000000696.

    PMID: 31256636
  2. 2

    Thrombocytopenia is Associated with Higher Fontan Pressure and Increased Morbidity in Patients with Fontan Circulation.

    Gould M, Gunsaulus M, Feingold B, et al.

    Pediatric cardiology 2025; (46(6)):1537-1543 doi:10.1007/s00246-024-03567-w.

    PMID: 38951145
  3. 3

    Management of the adult Fontan patient.

    Rodriguez FH, Book WM

    Heart (British Cardiac Society) 2020; (106(2)):105-110 doi:10.1136/heartjnl-2019-314937.

    PMID: 31662332
  4. 4

    Role of imaging in the evaluation of single ventricle with the Fontan palliation.

    Kutty S, Rathod RH, Danford DA, Celermajer DS

    Heart (British Cardiac Society) 2016; (102(3)):174-83 doi:10.1136/heartjnl-2015-308298.

    PMID: 26567230
  5. 5

    Four-Dimensional Flow in Fontan Patients: Advanced Haemodynamic Assessment.

    Gabbert DD, Uebing AS, Voges I

    Journal of clinical medicine 2025; (14(11)) doi:10.3390/jcm14113801.

    PMID: 40507563
  6. 6

    The Influence of Respiration on Blood Flow in the Fontan Circulation: Insights for Imaging-Based Clinical Evaluation of the Total Cavopulmonary Connection.

    van der Woude SFS, Rijnberg FM, Hazekamp MG, et al.

    Frontiers in cardiovascular medicine 2021; (8()):683849 doi:10.3389/fcvm.2021.683849.

    PMID: 34422920
  7. 7

    Exercise Pathophysiology and Testing in Individuals With a Fontan Circulation.

    Mahendran AK, Katz D, Opotowsky AR, Lubert AM

    CJC pediatric and congenital heart disease 2023; (2(3)):112-123 doi:10.1016/j.cjcpc.2023.01.001.

    PMID: 37969357
  8. 8

    Prediction of heart failure and death in an adult population of Fontan patients.

    Sieweke JT, Haghikia A, Riehle C, et al.

    Cardiology in the young 2019; (29(5)):602-609 doi:10.1017/S1047951119000258.

    PMID: 31036097
  9. 9

    Advances in Diagnostic and Interventional Catheterization in Adults with Fontan Circulation.

    Belahnech Y, Martí Aguasca G, Dos Subirà L

    Journal of clinical medicine 2024; (13(16)) doi:10.3390/jcm13164633.

    PMID: 39200775
  10. 10

    Transcatheter interventions in patients with a Fontan circulation: Current practice and future developments.

    Jalal Z, Gewillig M, Boudjemline Y, et al.

    Frontiers in pediatrics 2022; (10()):965989 doi:10.3389/fped.2022.965989.

    PMID: 36110107
  11. 11

    Fontan-associated liver disease: A review.

    Gordon-Walker TT, Bove K, Veldtman G

    Journal of cardiology 2019; (74(3)):223-232 doi:10.1016/j.jjcc.2019.02.016.

    PMID: 30928109
  12. 12

    Surveillance for liver complications after the Fontan procedure.

    Hilscher MB, Johnson JN, Cetta F, et al.

    Congenital heart disease 2017; (12(2)):124-132 doi:10.1111/chd.12446.

    PMID: 28140526
  13. 13

    Prognostic biomarkers in Fontan associated liver disease.

    Anouti A, Aqul A, Bartlett JA, et al.

    Translational pediatrics 2026; (15(2)):54 doi:10.21037/tp-2025-1-861.

    PMID: 41810185
  14. 14

    Ultrasound-MRI Agreement in Individuals Undergoing Surveillance of Fontan-associated Liver Disease.

    Wang H, Rubadeux D, Trout AT, et al.

    Journal of computer assisted tomography 2025; (49(5)):705-713 doi:10.1097/RCT.0000000000001751.

    PMID: 40165034
  15. 15

    Fontan-Associated Liver Disease: Spectrum of Disease in Children and Adolescents.

    Rathgeber SL, Guttman OR, Lee AF, et al.

    Journal of the American Heart Association 2020; (9(1)):e012529 doi:10.1161/JAHA.119.012529.

    PMID: 31902322
  16. 16

    Fontan-associated liver disease and hepatocellular carcinoma in adults.

    Kogiso T, Tokushige K

    Scientific reports 2020; (10(1)):21742 doi:10.1038/s41598-020-78840-y.

    PMID: 33303924
  17. 17

    Fontan-associated liver disease: the importance of multidisciplinary teamwork in its management.

    Tsuchihashi T, Cho Y, Tokuhara D

    Frontiers in medicine 2024; (11()):1354857 doi:10.3389/fmed.2024.1354857.

    PMID: 39664312
  18. 18

    Fontan-Associated Liver Disease.

    Hilscher MB, Johnson JN

    Seminars in liver disease 2025; (45(1)):114-128 doi:10.1055/a-2556-4897.

    PMID: 40081822
  19. 19

    Single Ventricle Fontan: The Basics for General Cardiologists.

    Sarubbi B, Fusco F, Palma M, et al.

    Methodist DeBakey cardiovascular journal 2026; (22(3)):54-66 doi:10.14797/mdcvj.1816.

    PMID: 42403550
  20. 20

    Impact of Atrial Fibrillation on Fontan Circulation: Fontan Computational Model.

    Sughimoto K, Ueda T, Fujiwara T, et al.

    The Annals of thoracic surgery 2022; (114(4)):1460-1467 doi:10.1016/j.athoracsur.2021.08.061.

    PMID: 34600904
  21. 21

    Review of rhythm disturbances in patient after fontan completion: epidemiology, management, and surveillance.

    Wall K, Hebson C, D'Souza R, Balaji S

    Frontiers in pediatrics 2025; (13()):1506690 doi:10.3389/fped.2025.1506690.

    PMID: 40013112
  22. 22

    Surgical Considerations in Adult Congenital Heart Disease Heart Failure.

    Marshall V WH, McConnell P

    Heart failure clinics 2024; (20(2)):199-208 doi:10.1016/j.hfc.2023.12.007.

    PMID: 38462324
  23. 23

    Long-term management of Fontan patients: The importance of a multidisciplinary approach.

    Martino D, Rizzardi C, Vigezzi S, et al.

    Frontiers in pediatrics 2022; (10()):886208 doi:10.3389/fped.2022.886208.

    PMID: 36090574

This page explains lifelong surveillance after Fontan surgery for informational purposes only and does not constitute medical advice. Your child's cardiology, ACHD, and liver specialists should set the testing schedule and interpret results.