Acute Lung Injury As Severe Acute Respiratory Distress Syndrome After Fentanyl Overdose.

Acute lung injury following fentanyl overdose is an unusual presentation. Pulmonary edema has been associated with opioid and naloxone use. However, to our knowledge, there have been no previous reports of inhaled fentanyl-associated acute lung injury presenting with acute hypoxic respiratory failure secondary to severe acute respiratory distress syndrome. We report a case of inhaled fentanyl-related severe acute respiratory distress syndrome which presented immediately after snorting fentanyl. This patient developed hypoxia requiring 100% oxygen on non-rebreather mask, and acute respiratory distress syndrome was confirmed on chest X-ray and computed tomography on admission. He was successfully treated with steroids with recovery in 48 hours. Naloxone was used in this patient, which has been associated with pulmonary edema in case reports and series, but clinical findings were more consistent with acute respiratory distress syndrome rather than pulmonary edema. The mechanism for this clinical presentation is not well known. Proposed mechanisms include lung injury from inhalation against an obstruction in a manner similar to post-obstructive pulmonary edema. Although our patient rapidly responded to symptomatic treatment and steroid course, our case also highlights the need for further study to elucidate the various clinical presentations associated with fentanyl use-related lung toxicity including acute respiratory distress syndrome.