Nitin Kuppanda, MD
Published March. 08, 2022
This is a single-site cross sectional study done at a single large academic emergency department using a non-randomized, convenience sample of patients.
The objective of the study was to assess whether ultrasound could help determine safety of chest tube insertion sites compared to the more commonly used blind, landmark approach at the fifth intercostal space along the midaxillary line.
Fifty participants at a large, academic tertiary care emergency department were identified as possible participants. Exclusion criteria were patients who were pregnant, prisoners, less than 18 years old or greater than 99 years old, refused to consent, or lacked capacity to consent. The participants of this study were placed in a supine position and the left and right fifth intercostal spaces were identified on a physical exam. Then, the curvilinear probe on the ultrasound machine was used to identify the diaphragms on each side. The study leaders (who were the sonographers) noted if the diaphragm was above, below, or crossed the fifth intercostal space during the respiratory cycle. This resulted in a total of 100 hemithoraces for evaluation as data points. Participant demographics were recorded for each patient: age, height, weight, gender, if there was a history of COPD, asthma, prior thoracostomy and prior thoracic surgery. Statistical analysis was performed on the data points to determine the significance of the results.
81% of diaphragms were consistently below the 5th intercostal space, while 19% of diaphragms were either consistently above or had crossed the 5th intercostal space during respiration. The study showed diaphragms were above or crossing the 5th intercostal space during the respiratory cycle in 20% on the right side and 18% on the left side; in total, ultrasound had detected inaccurate locations 24% of the time, which is a significant incidence. Thus, ultrasound identified a safer thoracostomy tube placement site compared to the blind landmark approach, which can allow for more accurate localization and reduction in potential complications such as diaphragmatic injury and intra-abdominal penetration. These findings were statistically significant.
Ultrasound has the potential to identify safer thoracostomy tube placement and thus reduce possible complications, such as diaphragmatic or subdiaphragmatic insertion. Most emergency physicians are well trained in the E-FAST exam and thus, can easily and quickly identify the diaphragm prior to chest tube insertion. This study shows that ultrasound could decrease morbidity, mortality, iatrogenic injuries, and medical expenses with the use of ultrasound prior to thoracostomy tube placement.
Yes. This is a simple and easy way to identify chest tube insertion sites and could possibly reduce complications. In patients with blunt abdominal trauma, who may need chest tube insertions, physicians have to perform the E-FAST exam prior to starting the procedure, where the diaphragm is also identified. The site of the diaphragm could be marked, and the chest tube placed above that. I have seen a patient that had a subdiaphragmatic chest tube insertion and the use of ultrasound could have prevented that complication.
 Gray EJ, Cranford JA, Betcher JA, et al. Sonogram of safety: Ultrasound outperforms the fifth intercostal space landmark for tube thoracostomy site selection. Journal of Clinical Ultrasound. 2020;48(6):303-306. doi:10.1002/jcu.22851. https://onlinelibrary.wiley.com/doi/10.1002/jcu.22851