The goal of this observational study is to learn about the frequency and clinical impact of Euthyroid Sick Syndrome (ESS) in patients with Obesity Hypoventilation Syndrome (OHS) who are admitted to the intensive care unit (ICU) for acute respiratory failure. The main question it aims to answer is: How common is ESS in critically ill OHS patients, and does it affect the severity of illness and ICU outcomes? Participants with OHS who are admitted to the ICU will have blood tests for thyroid hormone levels (TT3, TT4, and TSH) within 24 hours of admission. Researchers will compare illness severity, oxygen levels, need for breathing support, ICU stay duration, and outcomes between those with and without ESS.
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ICU Mortality
Timeframe: During ICU stay (assessed up to 28 days)