Importância do diagnóstico diferencial em pacientes com Pneumonia Adquirida na Comunidade, em uso de drogas K-9 (spice)

Community-acquired pneumonia (CAP) is a condition with high morbidity and mortality, particularly among users of inhaled drugs. The use of the synthetic drug K9 (spice) has been associated with chemical pneumonitis, whose clinical presentation can mimic respiratory infections, complicating diagnosis and appropriate management. This study reports the case of a 33-year-old male patient with a history of substance dependence and recent K9 use, who was hospitalized with severe respiratory failure. Laboratory tests, chest computed tomography, and microbiological and molecular analyses for infectious agents were performed. Initial treatment included empirical antibiotic therapy, invasive ventilatory support, and systemic corticosteroids. The absence of identifiable pathogens and compatible radiological findings led to the diagnosis of K9-induced chemical pneumonitis. Corticosteroid therapy resulted in progressive clinical improvement, allowing extubation and hospital discharge after 24 days, with referral for rehabilitation. This case highlights the importance of considering synthetic drugs in the differential diagnosis of CAP in young individuals with a history of substance use, preventing unnecessary antibiotic use and ensuring more targeted treatment. Additionally, it underscores the need for professional training to recognize clinical and radiological patterns suggestive of chemical pneumonitis, as well as the development of public policies aimed at preventing synthetic drug use and mitigating its impact on public health.