Effect of five different body positions on lung function in stroke patients with tracheotomy.

Background: In stroke patients with tracheotomy, reduced lung function heightens pulmonary infection risk. Body position can affect lung function; however, its impact in stroke patients with tracheostomy remains unclear.

Objective: To investigate the influence of five body positions on pulmonary function in stroke patients with tracheotomy.

Methods: Pulmonary function was assessed in five body positions (supine, supine 30°, supine 60°, sitting, and prone) in 47 stroke patients who underwent tracheotomy. Diaphragmatic excursion during quiet breathing (DE_Q), diaphragmatic thickening fraction during quiet breathing (DTF_Q), and diaphragmatic excursion during coughing (DE_C) were measured using ultrasound. Peak cough flow (PCF) was measured using an electronic peak flow meter.

Results: Different positions had a significant impact on DE_Q, DE_C, and PCF in stroke patients with tracheotomy, although not on DTF_Q. DE_Q showed no significant differences between supine 60°, sitting, and prone positions. Both DE_C and PCF reached their maximum values in the sitting position. In the sub-group analysis, DE_Q in females did not show significant differences across different positions. Both males and females exhibited significantly higher PCF in the sitting compared to supine position. The lung function of obese patients was significantly better in the sitting than in the supine and supine 30° position. Regardless of the patient's level of consciousness and whether the brainstem was injured, lung function in the sitting position was significantly higher than in the supine position.

Conclusions: Body posture influences lung function in stroke patients with tracheotomy. Patients should adopt a sitting position to enhance pulmonary function.