Potassium serum level changes cause cardiac arrhythmias and should be recognized early. The patient who came to our emergency department with nausea was found to have a wide QRS complex tachycardia on the monitor. Since the hemodynamics of the patient was not stable, rhythm control was provided by performing cardioversion. Since there may be problems with excretion of potassium in the elderly and patients with comorbid diseases and the amount of potassium taken with diet is unknown, potassium level changes should be considered in electrocardiography changes. In this way, the survival rates of the patients who are admitted to the emergency service and whose treatment is started rapidly increases and morbidity rates decrease.
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