Whole lung lavage (WLL) is a challenging procedure; because lavage fluid may perturb the respiratory and hemodynamic systems. We observed severe airway obstruction and flattening arterial pressure wave during WLL for treatment of pulmonary alveolar proteinosis. The aim of this case report is to discuss the anesthetic requirement in order to prevent bronchospasm during WLL. Furthermore, we discuss the potential of lavage fluid to cause airway obstruction and decrease cardiac outflow through the mass effect.