A Rare Case of Diffuse Alveolar Hemorrhage Caused by Fentanyl Inhalation

Area of Science:

• Pulmonology
• Toxicology
• Emergency Medicine

Background:

• Diffuse alveolar hemorrhage (DAH) is a critical pulmonary condition often linked to autoimmune disorders or infections.
• Emerging concerns include drug-induced DAH, particularly from inhaled substances like fentanyl.
• Substance abuse presents diagnostic challenges in patients with respiratory distress.

Observation:

• A 40-year-old male with bipolar disorder and polysubstance abuse presented with altered mental status and hemoptysis post-inhalation.
• Physical exam revealed respiratory distress, miosis, and severe hypoxemia, with improvement after naloxone.
• Imaging showed diffuse bilateral opacities; bronchoalveolar lavage confirmed DAH with hemosiderin-laden macrophages.

Findings:

• Fentanyl-specific urine test was positive, ruling out infection as the primary cause.
• The patient's condition significantly improved with corticosteroid therapy.
• This case highlights fentanyl inhalation as a cause of DAH.

Implications:

• Clinicians should consider drug-induced DAH, especially fentanyl-induced, in patients with unexplained pulmonary symptoms and altered mental status after substance use.
• Early identification and management of DAH are crucial for patient outcomes.
• This underscores the need for comprehensive toxicological screening in relevant clinical presentations.