<prompt> After undergoing a left pneumonectomy, a female patient has a chest tube in place for drainage. When caring for this patient, the nurse mustMonitor fluctuations in the water-seal chamberClamp the chest tube once every shiftEncourage coughing and deep breathingMilk the chest tube every 2 hours  <response>: When caring for a patient who is recovering from a pneumonectomy, the nurse should encourage coughing and deep breathing to prevent pneumonia in the unaffected lung.Because the lung has been removed, the water-seal chamber should display no fluctuations. Reinflation is not the purpose of a chest tube.Chest tube milking is controversial and should be done only to remove blood clots that obstruct the flow of drainage. 