嚴重嘔吐的病人有哪種酸鹼失衡的風險？

嚴重嘔吐的病人因胃液大量流失，導致體內酸鹼平衡失調。胃液富含鹽酸（hydrochloric acid, HCl），其主要成分是氫離子（H+）和氯離子（Cl-）。當病人反覆或嚴重嘔吐時，體內的鹽酸會大量排出體外，使得血液中的氫離子濃度相對降低，進而導致血漿碳酸氫根（bicarbonate, HCO3-）濃度相對升高，身體呈現代謝性鹼中毒（metabolic alkalosis）狀態。護理師需密切監測病人的電解質狀況，特別是鉀離子（K+）和氯離子，因為鹼中毒常伴隨低血鉀和低血氯，這可能導致心律不整等嚴重併發症，因此及早識別並介入是臨床照護重點。

Severe vomiting causes acid-base imbalance through the loss of large volumes of gastric fluid. Gastric juice is rich in hydrochloric acid (HCl), composed mainly of hydrogen ions (H+) and chloride ions (Cl-). With repeated or severe vomiting, large amounts of HCl are lost, causing a relative decrease in blood hydrogen ion concentration and a corresponding relative increase in plasma bicarbonate (HCO3-), producing metabolic alkalosis. The nurse must closely monitor electrolytes, particularly potassium (K+) and chloride, because alkalosis is often accompanied by hypokalemia and hypochloremia, which can lead to serious arrhythmias. Early recognition and intervention are clinical priorities.

對於因嘔吐導致的代謝性鹼中毒的生理機轉與臨床處置原則，台灣與美國的護理實務並無顯著差異。兩地皆強調監測病人的電解質、酸鹼值，並給予靜脈輸液及電解質補充，以糾正失衡狀態。護理評估與介入措施也保持一致，遵循生理學原理。