What is the best way to determine if the patient has gastrointestinal complications from immobility?

A. Monitoring blood glucose levels is a metabolic assessment primarily indicated for patients with diabetes mellitus or those receiving parenteral nutrition. Immobility does not directly cause acute fluctuations in serum glucose concentrations in the absence of underlying endocrine pathology. While stress can elevate glucose, it is not a specific indicator of gastrointestinal function or peristaltic efficiency. B. Vital signs such as heart rate and blood pressure provide critical data regarding the patient's hemodynamic stability and autonomic nervous system response. While significant gastrointestinal distress, such as a bowel perforation or severe obstruction, may eventually cause tachycardia or hypotension, these are late-stage systemic signs. They lack the specificity required to detect early-onset ileus or constipation. C. Assessing bowel sounds via auscultation is the most direct clinical method for evaluating the mechanical effects of immobility on the digestive tract. Reduced physical activity often leads to decreased peristalsis, potentially resulting in constipation or a paralytic ileus. The presence of hypoactive or absent bowel sounds in all four quadrants specifically alerts the nurse to these common gastrointestinal complications. D. Oxygen saturation levels reflect the efficiency of pulmonary gas exchange and peripheral tissue perfusion rather than digestive motility. Although severe abdominal distension from an obstruction can secondary impact respiratory excursion by elevating the diaphragm, it is an indirect and non-specific finding. Pulse oximetry is not a diagnostic tool for identifying primary gastrointestinal complications related to a sedentary state.