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Heart failure and kidney perfusion are interconnected in a complex way. Reduced renal perfusion and venous congestion are two significant factors that contribute to renal dysfunction in heart failure. The kidneys, primarily responsible for fluid balance in the body, are adversely affected due to compromised cardiac output and increased venous pressure. In response to reduced renal perfusion, the kidneys activate neurohumoral mechanisms to restore balance. However, these mechanisms can be...
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Thiazide-Associated Hyponatremia and Mortality Risk: A Cohort Study.

Steven G Achinger1,2, Juan Carlos Ayus3, Ambuj Kumar4

  • 1Department of Nephrology and Hypertension, University of South Florida, Tampa, FL.

Kidney Medicine
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Patients starting thiazide diuretics who develop hyponatremia face a significantly increased risk of mortality. This study highlights the importance of monitoring sodium levels in hypertensive patients on thiazide therapy.

Keywords:
Hyponatremiamortalitysodiumthlazide diuretics

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Area of Science:

  • Cardiology
  • Nephrology
  • Pharmacology

Background:

  • Hypertension affects millions globally, with thiazide diuretics being a common treatment.
  • Hyponatremia is a known complication of thiazide therapy.
  • The mortality risk associated with thiazide-induced hyponatremia in outpatients is not well-established.

Purpose of the Study:

  • To investigate the association between early hyponatremia and mortality in outpatients initiating thiazide diuretic treatment.
  • To compare mortality rates in patients who develop hyponatremia versus those who do not.

Main Methods:

  • Retrospective cohort study utilizing deidentified electronic medical records from the TriNetX network (approx. 93 million patients).
  • Included adult patients (40-90 years) with essential hypertension starting thiazide diuretics (2010-2021).
  • Propensity score matching was used to compare a hyponatremia cohort (serum sodium ≤135 mmol/L within 6 months) with a control cohort (serum sodium 136-144 mmol/L).

Main Results:

  • The hyponatremia cohort exhibited a significantly higher hazard of one-year mortality (HR 1.96; 95% CI, 1.72-2.28; P < 0.001).
  • Increased hazards were also observed for sepsis, pneumonia, urinary tract infections, cellulitis, myocardial infarction, stroke, congestive heart failure, ataxia, and hip fracture in the hyponatremia group.

Conclusions:

  • Developing early hyponatremia after starting thiazide diuretics is associated with a substantially increased risk of mortality.
  • These findings underscore the need for vigilant monitoring of serum sodium levels in patients on thiazide therapy.