title: Evaluation of Serial High Sensitivity Troponin T Levels in Individuals Without Overt Coronary Heart Disease Following Exercise Stress Testing.
abstract: BACKGROUND
  Detectable levels of high sensitivity (cardiac) troponin T (HsTnT), occur in the majority of patients with stable coronary heart disease (CHD), and often in 'healthy' individuals. Extreme physical activity may lead to marked elevations in creatine kinase MB and TnT levels. However, whether HsTnT elevations occur commonly after exercise stress testing (EST), and if so, whether this has clinical significance, needs clarification.
  
  
  METHODS
  To determine whether HsTnT levels become elevated after EST (Bruce protocol) to ≥95% of predicted maximum heart rate in presumed healthy subjects without overt CHD, we assayed HsTnT levels for ∼5h post-EST in 105 subjects (median age 37 years).
  
  
  RESULTS
  Pre-EST HsTnT levels <5 ng/L were present in 31/32 (97%) of females and 52/74 (70%) of males. Post-EST, 13 (12%) subjects developed HsTnT levels >14 ng/L, with troponin elevation occurring at least three hours post-EST. Additionally, a detectable ≥ 50% increase in HsTnT levels (4.9→9ng/L) occurred in 28 (27%) of subjects who during EST achieved ≥ 95% of their predicted target heart rate. The median age of the subjects with HsTnT elevations to > 14ng/L post-EST was higher than those without such elevation (42 and 36 years respectively; p=0.038). At a median follow-up of 13 months no adverse events were recorded.
  
  
  CONCLUSIONS
  The current study demonstrates that detectable elevations occur in HsTnT post-EST in 'healthy' subjects without overt CHD. Future studies should evaluate the clinical significance of detectable elevations in post-EST HsTnT with long-term follow-up for adverse cardiac events.
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia.
authors.forename: Yousef M E
authors.initials: YME
authors.lastname: Saad
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia.
authors.forename: Hanan
authors.initials: H
authors.lastname: Idris
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia.
authors.forename: Ibrahim M
authors.initials: IM
authors.lastname: Shugman
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia.
authors.forename: Krishna K
authors.initials: KK
authors.lastname: Kadappu
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia.
authors.forename: Rohan
authors.initials: R
authors.lastname: Rajaratnam
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia.
authors.forename: Liza
authors.initials: L
authors.lastname: Thomas
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia.
authors.forename: Christian
authors.initials: C
authors.lastname: Mussap
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia.
authors.forename: Dominic Y C
authors.initials: DYC
authors.lastname: Leung
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia.
authors.forename: Craig P
authors.initials: CP
authors.lastname: Juergens
authors.affiliation: Department of Cardiology, Liverpool Hospital, Sydney, NSW, Australia; South Western Sydney Clinical School, the University of New South Wales, Sydney, NSW, Australia. Electronic address: j.french@unsw.edu.au.
authors.forename: John K
authors.initials: JK
authors.lastname: French
mesh_terms: D000328:Adult; D003327:Coronary Disease / Q000097:blood; D005080:Exercise Test; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D020107:Troponin T / Q000097:blood*
chemical_list: D020107:Troponin T
keywords: Coronary heart disease; Exercise stress testing; High-sensitivity troponin T