Investigation of Subcarinal Angle and Tracheobronchial Morphology in Patients with COVID 19: A Retrospective Computed Tomography Study

Objective: Morphological features of the trachea are very important in choosing the correct endotracheal tube size for intubation. In this study, it was proposed to reveal the effect of SARS-CoV-2 on tracheobronchial morphology and subcarinal angle. Method: 56 (26 female, 30 male) COVID-19 and 48 (24 female, 24 male) healthy individuals aged 40 and over were included in the study. The mean age of female patients with COVID-19 was 51.30±12.78 years, while the women in the control group were 45.00±11.89 years. The mean age of male patients with COVID-19 was 48.73±13.99 years, while the mean age of men in the control group was 43.76±8.45 years. The trachea length (TL), proximal, middle and distal levels anteroposterior (AP) and transverse (TR) trachea diameters (TD), subcarinal angle (SA), proximal right main bronchus (RMB) and left main bronchus (LMB) diameters were also measured on computed tomography (CT) images. Results: The RMB angle was higher in men with COVID-19 than in the control group (p=0.005). TL was lower in women with COVID-19 than in the control group (p=0.030). Proximal AP-TD was higher in men with COVID-19 than in the control group (p=0.006). Proximal TR-TD was lower in men with COVID-19 than in the control group (p=0.029). TL, proximal, middle, and distal levels of AP and TR-TD,SA, RMB, and LMB angles, and proximal RMB and LMB diameters were found to be lower in women with COVID-19 than in men with COVID-19 (p=0.001). Conclusion: It was deduced that tracheobronchial morphology might change in patients infected with SARS-CoV-2.It is clinically important that this situation should not be overlooked, especially in the indication of endotracheal intubation.