Effects of Thymectomy During Cardiothoracic Surgery

NCT00263120 | Completed

• 1 other identifier: 2005-12-003Halnon
• Study Type: observational
• Target: 124
• Locations: 1 country
• Sites: 1

Brief Summary

The thymus is known to be the site of T cell development in humans. Due to its location in the chest in front of the heart, incidental thymecomy is commonly performed during cardiothoracic surgery, especially in infants and children, so that surgeons may gain access to the surgical field. This practice has been considered safe because it was thought that the thymus is inactive after birth. However, recent data using newly developed techniques has demonstrated that the thymus normally is active well into adulthood. In addition, in a previous study (UCLA IRB # 02-03-008-02) we have demonstrated alterations in lymphocyte (T cells) number in individuals who have undergone thymectomy in childhood but we do not know how immunity is affected. We plan to investigate if immune development or immune function later in life is affected by the loss of T cell production caused by thymectomy during cardiothoracic surgical procedures in childhood. At UCLA, a large number of patients are seen who have congenital heart disease and undergo surgical procedures for correction or repair and many children and adults are followed for many years after they have undergone surgical procedures. Subjects for study will be recruited from among these patients. We propose a study which will examine the number and activity of lymphocytes obtained from blood samples from child and young adult subjects who have undergone surgery in early childhood. We will determine if these subjects have had complete thymectomy in the past using CT or MRI (obtained during routine care) or, for subjects who are having cardiothoracic surgery, by visualization of thymic tissue during the procedure. In addition we will give vaccination for a common viral illness (hepatitis A) and measure immune responses to it (from a blood sample). As part of this study, we will ask for medical information consisting of a history of congenital cardiac disease and other diagnoses (such as asthma), a history of infections and hospitalizations, and information about immunizations. We will also ask about a list of specific symptoms which will give us information about the function of the immune system.

Conditions

Thymectomy and Cardiothoracic Surgery

Outcome Measures

Primary Outcomes (1)

• immune dysfunction

  late

Interventions

Pain Questionnaire BEHAVIORAL

Eligibility Criteria

• Age: Up to 35 Years
• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64)
• Sampling Method: Non-Probability Sample

Study Population

child and young adult subjects who have undergone surgery in early childhood for correction or repair related to congenital heart disease enrolled for the observational portion of this protocol only

You may qualify if:

• Age: birth to 35 years.
• Planning cardiac surgical procedure at UCLA Medical Center.
• For subjects with a history of prior cardiothoracic surgery: undergoing CT or MRI evaluation prior to reoperation.

You may not qualify if:

• Unable to travel to UCLA Medical Center for follow up blood tests (infants and young children in longitudinal study)
• Known thymus/immune deficiency disorder (i.e. DiGeorge Syndrome)

Sponsors & Collaborators

• University of California, Los Angeles: lead

Study Sites (1)

UCLA Adult Congenital Heart Disease Clinic

Los Angeles, California, 90095, United States

Location

Related Publications (2)

• Halnon NJ, Jamieson B, Plunkett M, Kitchen CM, Pham T, Krogstad P. Thymic function and impaired maintenance of peripheral T cell populations in children with congenital heart disease and surgical thymectomy. Pediatr Res. 2005 Jan;57(1):42-8. doi: 10.1203/01.PDR.0000147735.19342.DE. Epub 2004 Nov 5.

  PMID: 15531736 RESULT

• Halnon NJ, Cooper P, Chen DY, Boechat MI, Uittenbogaart CH. Immune dysregulation after cardiothoracic surgery and incidental thymectomy: maintenance of regulatory T cells despite impaired thymopoiesis. Clin Dev Immunol. 2011;2011:915864. doi: 10.1155/2011/915864. Epub 2011 Jul 6.

  PMID: 21776289 RESULT

Study Officials

• Nancy J. Halnon, M.D.

  Pediatric Cardiology, UCLA

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: observational
• Observational Model: COHORT
• Time Perspective: CROSS SECTIONAL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Principal Investigator

Study Record Dates

• First Submitted: December 5, 2005
• First Posted: December 7, 2005
• Study Start: March 1, 2006
• Primary Completion: March 1, 2010
• Study Completion: March 1, 2010
• Last Updated: August 24, 2016

Record last verified: 2016-08

Data Sharing

• IPD Sharing: Will not share

Locations

US (1)