Related Experiment Video
Updated: Jul 16, 2026
08:33
An Ex vivo Culture System to Study Thyroid Development
Published on: June 6, 2014
Thyroid function in neonates with severe respiratory failure on extracorporeal membrane oxygenation
D L Stewart1, N Ssemakula, D R MacMillan
1Department of Pediatrics, University of Louisville School of Medicine, KT 40202-3830, USA. danstewart@louisville.edu
Perfusion
|January 5, 2002
Summary
Thyroid function abnormalities in neonates undergoing extracorporeal membrane oxygenation (ECMO) for severe respiratory failure are linked to prognosis. The ratio of reverse triiodothyronine to free triiodothyronine (rT3/FT3) effectively predicts outcomes in these critically ill infants.
Area of Science:
- Neonatal Intensive Care
- Pediatric Endocrinology
- Cardiopulmonary Support
Background:
- Severe respiratory failure in neonates often necessitates extracorporeal membrane oxygenation (ECMO).
- Thyroid function can be significantly impacted by critical illness and mechanical support.
- Understanding thyroid hormone dynamics during ECMO is crucial for managing these vulnerable patients.
Purpose of the Study:
- To investigate thyroid function in neonates with severe respiratory failure supported by ECMO.
- To determine if alterations in thyroid function correlate with patient prognosis (survival vs. non-survival).
Main Methods:
- Measured serum concentrations of total and free thyroxine (T4, FT4), triiodothyronine (T3, FT3), reverse triiodothyronine (rT3), thyroid-stimulating hormone, and thyroxine-binding globulin in 14 neonates.
- Collected samples at baseline (pre-ECMO), and at multiple time points during ECMO (30 min to 8 days).
- Analyzed data by comparing thyroid function parameters between survivors and non-survivors.
Main Results:
- No significant pre-ECMO differences in thyroid function tests between eventual survivors and non-survivors.
- Survivors showed a significant decline in T4, FT4, T3, FT3, and rT3 within 30-60 min of ECMO initiation, followed by complete recovery above baseline by days 2-8.
- Non-survivors exhibited non-significant declines and failed to achieve baseline recovery of thyroid hormone levels.
- The rT3/FT3 ratio was significantly different between survivors and non-survivors throughout the ECMO course (p < 0.0005).
Conclusions:
- Neonates with severe respiratory failure on ECMO experience significant thyroid function abnormalities.
- The rT3/FT3 ratio serves as a valuable prognostic marker during ECMO.
- Survival is associated with a transient reduction in thyroid hormones followed by recovery, suggesting adaptive down-regulation of the pituitary-thyroid axis.
Related Concept Videos
01:18Functions of Thyroid Hormones
The thyroid hormone (TH) plays a pivotal role in the intricate orchestration of physiological processes, exerting profound effects on development, metabolism, and homeostasis throughout different life stages.
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
TH is indispensable for the normal development and maturation of the skeletal, muscular, and nervous systems during fetal and childhood growth. It facilitates bone mineral turnover and regulates protein synthesis in developing tissues, contributing significantly to overall growth and...
01:21Acute Respiratory Failure-II
Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
01:30Acute Respiratory Failure-III
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...
01:29Acute Respiratory Failure-V
The treatment for acute respiratory failure varies based on factors like the underlying cause, overall health, and severity. A collaborative healthcare team is essential for early detection, often through arterial blood gas analysis. Identifying the cause is the primary goal, with treatment strategies adjusted for ventilation/perfusion (V/Q) mismatch, shunting, or diffusion impairment.
Ensure that patients are monitored continuously for their response to therapy, including changes in...
Ensure that patients are monitored continuously for their response to therapy, including changes in...
01:27Hyperthyroidism II: Pathophysiology
Hyperthyroidism is a hypermetabolic state caused by elevated levels of thyroid hormones, triiodothyronine (T3) and thyroxine (T4). It results from dysregulation at the thyroid, pituitary, or immune system level and affects multiple organ systems.PathophysiologyThe most common cause of hyperthyroidism is Graves’ disease, an autoimmune disorder in which antibodies, specifically thyroid-stimulating antibodies (TSAb), a subtype of TSH receptor antibodies (TRAb), bind to and activate TSH receptors...
01:23Hypothyroidism II: Pathophysiology
Hypothyroidism is a disorder characterized by insufficient production of thyroid hormones, which regulate metabolism, energy balance, and multiple organ systems.TypesHypothyroidism is classified based on the level of dysfunction. Primary hypothyroidism results from intrinsic thyroid gland dysfunction, causing reduced hormone production despite normal or increased stimulation. Secondary hypothyroidism arises from inadequate thyroid-stimulating hormone (TSH) secretion by the pituitary. Tertiary...