An Investigation of The Relationship Between Muscle Mass, Physiological Parameters, and Blood Gas Levels in Adult Patients Hospitalized in The Intensive Care Unit

This study was designed to investigate the relationship between muscle mass and physiological parameters and blood gas values in adult patients admitted to the intensive care unit. While muscle mass will be determined using anthropometric measurements, SpO₂, pulse rate, blood pressure, diuresis, and arterial blood gas values will be evaluated. The primary hypothesis of the study is that there is a significant relationship between muscle mass and, in particular, oxygenation and other physiological and blood gas parameters.

Inclusion Criteria: * Inclusion Criteria: Age: Adult patients aged 18 years and older Clinical unit: Patients admitted to palliative care, pulmonary intensive care, or cardiovascular intensive care units Length of stay: Patients expected to remain in the intensive care unit for at least 48 hours Physical eligibility: Patients with no conditions preventing the measurement of muscle mass Clinical stability: Patients without severe hemodynamic instability or active bleeding at the time of measurement Ethical compliance: Individuals who have volunteered to participate in the study and whose informed consent has been obtained from them or their legal representative Exclusion Criteria: * Exclusion Criteria: * Patients with a history of previously diagnosed neuromuscular disorders (myasthenia gravis, Guillain-Barré syndrome, chronic polyneuropathies) * Patients with severe renal or hepatic insufficiency that could directly affect muscle mass * Presence of severe edema: Patients with a pitting edema score of 3+ or 4+ on the pitting edema test, or individuals with documented widespread edema in nursing or medical records * Patients with an amputation, hematoma, or open wound on the extremity to be measured * Pregnant patients * Patients whose intensive care stay lasted less than 48 hours or for whom the measurement could not be completed due to discharge or death