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Open Access Original investigation

Clinical significance of troponin elevations in acute decompensated diabetes without clinical acute coronary syndrome

Anthony Eubanks2, Farhan Raza2, Mohamad Alkhouli12, April N Glenn3, Carol Homko1, Abul Kashem1 and Alfred Bove13*

Author Affiliations

1 Cardiology Section, Temple University School of Medicine, Philadelphia, USA

2 Department of Internal Medicine, Temple University School of Medicine, Philadelphia, USA

3 Temple University Medical Center – Cardiology Section, 3401 North Broad Street, Room, Philadelphia, PA, 19140, USA

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Cardiovascular Diabetology 2012, 11:154  doi:10.1186/1475-2840-11-154

Published: 27 December 2012

Abstract

Background

Elevation of cardiac troponin has been documented in multiple settings without acute coronary syndrome. However, its impact on long-term cardiac outcomes in the context of acute decompensated diabetes remains to be explored.

Methods

We performed a retrospective analysis of 872 patients admitted to Temple University Hospital from 2004–2009 with DKA or HHS. Patients were included if they had cardiac troponin I (cTnI) measured within 24 hours of hospital admission, had no evidence of acute coronary syndrome and had a follow up period of at least 18 months. Of the 264 patients who met the criteria, we reviewed the baseline patient characteristics, admission labs, EKGs and major adverse cardiovascular events during the follow up period. Patients were categorized into two groups with normal and elevated levels of cardiac enzymes. The composite end point of the study was the occurrence of a major cardiovascular event (MACE) during the follow up period and was compared between the two groups.

Results

Of 264 patients, 24 patients were found to have elevated cTnI. Compared to patients with normal cardiac enzymes, there was a significant increase in incidence of MACE in patients with elevated cTnI. In a regression analysis, which included prior history of CAD, HTN and ESRD, the only variable that independently predicted MACE was an elevation in cTnI (p = 0.044). Patients with elevated CK-MB had increased lengths of hospitalization compared to the other group (p < 0.001).

Conclusions

Elevated cardiac troponin I in patients admitted with decompensated diabetes and without evidence of acute coronary syndrome, strongly correlate with a later major cardiovascular event. Thus, elevated troponin I during metabolic abnormalities identify a group of patients at an increased risk for poor long-term outcomes. Whether these patients may benefit from early detection, risk stratification and preventive interventions remains to be investigated.

Keywords:
Cardiac troponin-I; Decompensated diabetes; Prognostic markers; Acute coronary syndrome; CK-MB