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  • Title: Severe Hypokalemia Complicated by Acute Myopathy: Initial Manifestation of Primary Sjögren's Syndrome-Associated Renal Tubular Acidosis.
    Author: Gao YL, Milebe Nkoua GD, Chai YF.
    Journal: Am J Case Rep; 2023 Jul 23; 24():e940268. PubMed ID: 37481699.
    Abstract:
    BACKGROUND Severe hypokalemia, which often causes life-threatening malignant arrhythmias, is usually first diagnosed in the Emergency Department (ED). It is important to note that hypokalemia is often closely and complexly related to renal tubular acidosis (RTA) associated with autoimmune diseases such as Sjögren's syndrome (SS), especially in females with acute myopathy or acute liver injury (ALI). Severe hypokalemia can directly cause muscle injury, which can lead to hyper-creatine kinaseemia (HCK) and ALI, while SS can also directly cause hypokalemia, HCK, and even ALI and renal tubular/interstitial injury. Therefore, by reporting a rare case of SS-associated RTA (SS-RTA), we systematically reviewed the relationship between SS-RTA and severe hypokalemia, which may be beneficial to increase attention on this topic. CASE REPORT A 35-year-old female patient who presented to the ED primarily for limb weakness symptoms was initially diagnosed with severe hypokalemia, acute myopathy, and ALI. She was eventually diagnosed with primary SS (pSS) and SS-RTA, although she did not present with the typical dry mouth, dry eyes, and other clinical manifestations of SS. CONCLUSIONS Severe hypokalemia is a serious life-threatening emergency, and although the differential diagnosis is very broad, we should be aware of RTA associated with autoimmune diseases such as SS in female patients, especially when combined with clinical manifestations such as acute myopathy and ALI that cannot be explained by other causes. Simultaneously, we hope to be able to guide emergency physicians encountering similar patients to complete the diagnostic and therapeutic process.
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