Resistant Hypertension and Severe Hypokalemia Revealing Bilateral Adrenal Adenomas in Primary Aldosteronism: A Case Report
Shamas Rafique, Iqra Rafiq, Saad A. Janjuah
Researchers' Journal of Internal Medicine.
Introduction: Resistant hypertension, defined as uncontrolled blood pressure despite multiple antihypertensive agents, necessitates evaluation for secondary causes. Primary aldosteronism (PA) is a common but underdiagnosed endocrine etiology, characterized by autonomous aldosterone production leading to hypertension, hypokalemia, and suppressed renin. Case Presentation: A 60-year-old male presented with hypertension refractory to a five-drug regimen. Persistent hypokalemia (K as low as 2.4 mmol/L) and hypernatremia prompted biochemical testing, which revealed a markedly elevated aldosterone-to-renin ratio of 287.5 (aldosterone 23 ng/dL, renin 0.08 ng/mL/h). CT imaging confirmed bilateral lipid-rich adrenal adenomas. An electrocardiogram during severe hypokalemia showed significant QT prolongation (QTc 514 ms). Treatment and Outcome: The patient was started on spironolactone. Follow-up at 14 days showed improved blood pressure (137/95 mmHg), sustained and normalized at three months (127/76 mmHg). Serial ECGs demonstrated correction of the QT interval following potassium repletion. Conclusion: This case highlights that primary aldosteronism is a reversible cause of resistant hypertension, frequently associated with bilateral disease. It underscores the critical importance of screening with the aldosterone-to-renin ratio in all patients with resistant hypertension, particularly when hypokalemia is present, as targeted therapy leads to rapid clinical improvement.