ERcast: Clinical Perspectives Podcast Preview
The summary below is from an episode of ERcast: Clinical Perspectives
Large primary spontaneous pneumothorax does not always require a chest tube. In clinically stable patients, conservative management with observation can avoid intervention for many, while supplemental oxygen appears to accelerate pleural air resorption, especially in larger pneumothoraces.
Conservative Management of Spontaneous Pneumothorax
- Stable large PSP: A hemodynamically stable patient with a large primary spontaneous pneumothorax may be managed without immediate tube thoracostomy, shifting the problem from automatic drainage to careful selection and observation.
- Observation first strategy: In the NEJM trial, moderate-to-large primary spontaneous pneumothorax was randomized to observation versus intervention, and conservative care still achieved 94% radiographic resolution by 8 weeks.
- Need for rescue intervention: Observation was not purely passive: 15% of conservatively managed patients ultimately needed a procedure, most often for intolerable symptoms or abnormal physiology.
- Follow-up feasibility: Conservative management depends on a system that can provide repeat imaging, reassessment, and rapid escalation if the patient worsens. We get into the practical selection issues in the episode.
- Tube size reframing: The usual debate over pigtail versus standard chest tube misses the bigger question in some stable patients: whether any pleural intervention is needed up front.
Oxygen and Pneumothorax Resolution
- Oxygen aided resorption: Supplemental oxygen increases the rate of pneumothorax absorption by steepening the nitrogen gradient, making pleural air reabsorb faster than on room air.
- Headline effect size: A classic study found the mean absorption rate increased about fourfold during high-flow oxygen therapy, with the biggest apparent benefit in larger pneumothoraces.
- Older evidence base: The oxygen data come mainly from small older studies rather than large modern randomized trials, so the physiologic rationale is stronger than the trial literature.
- Selective oxygen use: In the conservative-management trial, oxygen was not given routinely; it was reserved for patients with oxygen saturation below 92%, an important distinction from reflex high-flow use.
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References:
- Northfield TC. Oxygen therapy for spontaneous pneumothorax. Br Med J. 1971 Oct 9;4(5779):86-8. PMID: 4938315.
- Chadha TS, Cohn MA. Noninvasive treatment of pneumothorax with oxygen inhalation. Respiration. 1983;44(2):147-52. PMID: 6836190.
- Park CB, et al. Does oxygen therapy increase the resolution rate of primary spontaneous pneumothorax? J Thorac Dis. 2017 Dec;9(12):5239-5243. PMID: 29312731.
- Brown SGA, et al; PSP Investigators. Conservative versus Interventional Treatment for Spontaneous Pneumothorax. N Engl J Med. 2020 Jan 30;382(5):405-415. PMID: 31995686.
Faculty
- Mizuho Morrison, DO
Dr. Mizuho Morrison is a board-certified Emergency Medicine physician practicing in Southern California. She played a leadership role in FeminEM, helping develop and support its speaker coaching program, and occasionally contributes to Rebel EM. Additionally, Mizuho is an entrepreneur, co-founding 3MD| Three Mommy Doctors, a medical device company that redesigned first-aid kits for children. She lives in Orange County, CA, with her two children.
- Rob Orman, MD
Dr. Rob Orman is an emergency physician, educator, and executive coach specializing in physician performance and professional fulfillment. After more than 20 years in community emergency medicine, he now works with clinicians across specialties to address burnout, inefficiency, and career challenges. He earned his medical degree from Emory University School of Medicine and completed his residency at Denver Health Medical Center, where he served as chief resident. Dr. Orman is the founder of the Stimulus podcast and Orman Physician Coaching. He previously served as chief editor of ERcast and hosted Essentials of Emergency Medicine for nearly a decade.
