RESUMO
Massive hemoptysis is a life-threatening condition often defined as coughing up 300-600mL of blood in 24 hours in an adult, or >8mL/kg in 24 hours in a child. Although the definition is controversial, one should view massive hemoptysis as any volume of expectorated blood that can cause respiratory failure. This is because mortality in the setting of hemoptysis is usually associated with asphyxiation, rather than exsanguination. Massive hemoptysis accounts for only about 5% of cases of hemoptysis, but when treated conservatively, has a reported mortality rate between 50% and 85%. Etiologies vary widely based on demographics. In children, infectious causes predominate in developing countries, and cystic fibrosis predominates among children of European descent. In adults, malignancy, bronchiectasis, and chronic infection are the most common causes. Treatment begins with resuscitation and airway protection, followed by minimally invasive bronchoscopic and endovascular techniques. Surgical interventions are considered last line therapy due to mortality rates of 37%-43% in the setting of massive hemoptysis. Bronchial artery embolization is now considered the treatment of choice for massive hemoptysis.