What is the primary reason an unconscious patient is placed in the side-lying position when mouth care is provided?

The primary reason an unconscious patient is placed in the side-lying position during mouth care is to reduce the risk of aspiration. When patients are unconscious, their ability to cough or swallow is impaired, which increases their vulnerability to inhaling fluids or debris into the lungs during oral care. By positioning the patient on their side, the drainage of saliva and any oral fluids is facilitated, thereby minimizing the chance that these substances will enter the trachea and cause aspiration pneumonia, a serious condition that can arise from foreign materials in the lungs. Therefore, the side-lying position is a critical safety measure in providing mouth care for unconscious patients, ensuring their airway remains protected.