Don't Cop Out: Fulminant Cryptogenic Organizing Pneumonia Following Methamphetamine Inhalation

ABSTRACT

INTRODUCTION: Cryptogenic organizing pneumonia (COP) accounts for 5% of all ILD cases. Due to a low incidence rate of 1 case per 100,000 persons per annum, it is often misdiagnosed as bacterial pneumonia, but when timely managed, it has an excellent prognosis. We discuss Methamphetamine, a commonly abused stimulant that has unfortunately not yet garnered enough notoriety as a respiratory toxidrome for causing inhalation injury, potentially leading to fulminant COP. DESCRIPTION A 44-year-old male presented to ED with fevers, cough, and dyspnea gradually worsening over the past two weeks. Of note, he smoked ten cigarettes/day and relapsed to methamphetamines inhalation, the latest use being two weeks prior. On physical exam, oxygen saturation was 70% on RA and had significant bilateral inspiratory crackles. The respiratory Viral Panel, including COVID-19, was negative. Drug screens were negative. Chest X-Ray and CTA showed bilateral ground glass opacities concerning multifocal pneumonia but no pulmonary embolism. Broadspectrum antibiotics were started. For worsening Acute Hypoxemic Respiratory failure (AHRF) on Day 3, he underwent intubation and mechanical ventilation. Further workup for infectious etiologies like S. pneumoniae and Legionella, HIV-1, and sputum and blood cultures were all negative. Initial autoimmune and connective tissue disease workup was within normal limits. Bronchoalveolar lavage (BAL) analysis did not yield an infectious, inflammatory, or neoplastic source. On day 7, he underwent an open lung biopsy which confirmed COP, with histological features of toxic injury. IV glucocorticoids were started, with gradual improvement noticed in AHRF. DISCUSSION: Respiratory failure within 30 days of hospitalization is the most common cause of mortality in fulminant COP.If a patient's history suggests exposure to inhaled amphetamine and have no response to antibiotics for supposed pneumonia, physicians should consider COP to make a timely diagnosis and initiate glucocorticoid treatment to warrant rapid clinical improvement, often seen as early as 72 hours, and prevent future relapses.With Substance use continuing to be a major healthcare problem, now more than ever, healthcare providers must be familiar with respiratory toxidrome to provide timely diagnosis and treatment.