What are the most common indications for lung transplant. (Select all that apply)

Brief Introduction: End-stage lung disease necessitates transplantation when conservative medical therapies fail to maintain respiratory function. The procedure addresses irreversible parenchymal destruction or severe vascular remodeling, aiming to restore gas exchange and alleviate right-sided heart strain in patients with a high risk of mortality within two years, typically evidenced by a FEV1 < 20% in obstructive pathologies. Rationale: A. Hepatocellular carcinoma is a primary malignancy of the liver and does not serve as an indication for lung transplantation. Malignancy is often a strict contraindication for solid organ transplant unless it is the specific organ being replaced and meets rigorous criteria, as immunosuppression can accelerate the growth of residual cancer cells. B. Acute Respiratory Distress Syndrome (ARDS) is characterized by refractory hypoxemia due to acute alveolar-capillary membrane injury. Although life-threatening, ARDS is an acute condition often managed with ECMO or mechanical ventilation; transplant is reserved for chronic, progressive diseases rather than acute inflammatory processes that may potentially resolve with intensive care. C. Alcohol-associated liver disease affects the hepatic parenchyma and results in portal hypertension and cirrhosis. This condition would be an indication for a liver transplant, not a lung transplant, as the primary pathology is located within the digestive system rather than the pulmonary or thoracic cavity. D. Chronic Obstructive Pulmonary Disease (COPD) is the leading indication for lung transplantation worldwide. Progressive alveolar destruction and chronic airflow limitation lead to hyperinflation and severe disability; transplant is considered when the BODE index is 7 to 10, indicating a significant mortality risk despite optimal pulmonary rehabilitation. E. End-stage renal failure (ESR) involves the permanent loss of kidney function requiring dialysis or a renal transplant. Renal failure can cause pulmonary edema, but the underlying cause is fluid overload and uremic toxins, which are resolved through nephrology interventions rather than the replacement of pulmonary tissue. F. Pulmonary arterial hypertension (PAH) involves obliterative vasculopathy of the small pulmonary arteries, leading to increased vascular resistance. When refractory to prostanoids and other vasodilators, it causes cor pulmonale; transplantation is indicated to replace the high-resistance circuit and prevent terminal right heart failure in these patients.