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Cardiac troponin-I and its prognostic significance in a dialysis population

Magdi Hussein1, Jaap Mooij, Haysam Roujouleh

  • 1Departments of Nephrology and Dialysis, Al Hada Armed Forces Hospital, Taif, Saudi Arabia. jaapmooy@arab.net.sa

Hemodialysis International. International Symposium on Home Hemodialysis
|April 22, 2009
PubMed

Insights

Elevated cardiac troponin-I (cT-I) levels in hemodialysis patients, though not indicative of myocardial infarction, significantly predict one-year all-cause mortality. This finding highlights cT-I as a crucial prognostic marker in this population.

Area of Science:

  • Nephrology
  • Cardiology
  • Clinical Chemistry

Background:

  • Patients on maintenance hemodialysis often exhibit elevated cardiac biomarkers.
  • The diagnostic utility and prognostic significance of cardiac troponin-I (cT-I) in this population require clarification.
  • Comparison with other cardiac markers like creatine kinase (CK) and its fractions is essential.

Purpose of the Study:

  • To determine the prevalence and specificity of elevated cT-I in hemodialysis patients.
  • To assess the relationship between cT-I levels and other cardiac markers (CK, CK-MB).
  • To evaluate the prognostic value of cT-I for long-term all-cause mortality.

Main Methods:

  • 93 asymptomatic hemodialysis patients provided predialysis blood samples.
  • Measurements included cT-I, total CK, CK-MB fraction, and CK-MB/CK ratio.
  • Patients were followed for one year to correlate baseline cT-I with all-cause mortality using linear regression.

Main Results:

  • No patients exceeded the myocardial infarction cutoff for cT-I (2.0 ng/mL), confirming 100% specificity.
  • 9.7% of patients had detectable cT-I levels (>0.0 ng/mL).
  • Elevated baseline cT-I was the sole significant predictor of all-cause mortality at 1 year (p=0.029).

Conclusions:

  • Cardiac troponin-I demonstrates high specificity for diagnosing myocardial infarction in dialysis patients.
  • Despite a low positive rate, elevated cT-I is a significant predictor of 1-year all-cause mortality.
  • cT-I serves as a valuable prognostic marker in hemodialysis patients.
Abstract

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