Pulmonary heart disease is the abbreviation of chronic pulmonary heart disease, and metabolic alkalosis is mainly caused by the development of the disease and the impact of the treatment process, mainly in the acute attack of pulmonary heart disease, and aggravates the disease along with the emergence of cardiac insufficiency, the alveolar elastic retraction force continues to seriously decline, resulting in a large increase in the amount of air production in the lungs, making the degree of hypoxemia and hypercarbia more pronounced, leading to extreme respiratory failure and heart failure. The hypoxemia and hypercapnia become more pronounced, leading to extreme respiratory failure and heart failure. The use of diuretics, for example, during the course of treatment, causes a large amount of water to be expelled from the body, which can lead to electrolyte disorders and an imbalance in acid-base balance, resulting in metabolic alkalosis. In addition, the administration of oxygen, such as excessive concentration and rapid oxygen flow, may lead to the development of metabolic alkalosis.