The most common complications of pulmonary heart disease are as follows: 1. arrhythmias are most likely to occur, usually paroxysmal supraventricular tachycardia is more common, which can disappear on their own by correcting acid-base imbalance and correcting hypoxia and improving electrolyte disturbances. 2. acid-base imbalance and electrolyte metabolism disorders are common complications. 3. venous thromboembolism, due to prolonged patient in cardiac insufficiency, activity limitation and Patients are at increased risk of venous thromboembolism due to prolonged cardiac insufficiency, limited activity and age. 4. Patients have developed gastrointestinal bleeding because chronic pulmonary heart disease can be combined with gastrointestinal bleeding due to infection respiratory failure, lack of oxygen, and carbon dioxide storage leading to stasis in the gastrointestinal tract. 5. Pulmonary encephalopathy is also easily complicated, and the most severe pulmonary heart disease can result in neuropsychiatric dysfunction due to pulmonary cardio-pulmonary encephalopathy, even leading to Coma.