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Kidney Dysfunction Increases Mortality and Incident Events after Young Stroke: The FUTURE Study.

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Kidney dysfunction significantly increases long-term mortality and stroke recurrence risk in young adults after stroke, independent of other cardiovascular factors. This highlights the need for closer monitoring of young stroke survivors with impaired kidney function.

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Area of Science:

  • Nephrology
  • Neurology
  • Cardiovascular Medicine

Background:

  • Unidentified causes of stroke in young adults represent a significant clinical challenge.
  • Kidney dysfunction is a known risk factor for mortality and stroke in elderly populations.
  • Emerging evidence suggests non-traditional risk factors like chronic inflammation and oxidative stress in chronic kidney disease may impact cerebral microvasculature, potentially leading to stroke.

Purpose of the Study:

  • To investigate the impact of kidney dysfunction on long-term mortality and incident vascular events in young stroke patients (aged 18-50).
  • To determine if the association between kidney dysfunction and adverse outcomes is independent of traditional cardiovascular risk factors.

Main Methods:

  • A prospective cohort study included 460 young patients with ischemic stroke or transient ischemic attack.
  • Estimated glomerular filtration rate (eGFR) was calculated from baseline creatinine and categorized into three groups (<60, 60-120, >120 ml/min/1.73 m²).
  • Cox proportional hazard models were employed to analyze the effect of kidney dysfunction on mortality and vascular events, adjusting for cardiovascular risk factors.

Main Results:

  • An eGFR <60 was independently associated with a significantly increased risk of death (HR 4.6) and incident stroke (HR 4.1).
  • Fifteen-year cumulative mortality was substantially higher in patients with low eGFR (70%) compared to normal (24%) or high eGFR (30%).
  • Fifteen-year cumulative risk of recurrent stroke was also markedly elevated in patients with low eGFR (45%) versus normal (13%) or high eGFR (8%).

Conclusions:

  • Kidney dysfunction is a significant predictor of long-term mortality and stroke recurrence in young adults following a stroke.
  • The findings suggest that kidney dysfunction should be recognized as a potential risk factor for stroke development in younger individuals.
  • Intensified follow-up for young stroke patients with early signs of kidney dysfunction is warranted, potentially offering new insights into cerebrovascular disease etiology.