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High Sensitivity Troponin T ( hsTnT ). please press F5 on your keyboard to enter presentation mode please press F5 on your keyboard to enter presentation mode.

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  1. High Sensitivity Troponin T (hsTnT) please press F5 on your keyboard to enter presentation mode please press F5 on your keyboard to enter presentation mode Welcome to the Eastern Health Pathology guide to hsTnT. The information in this presentation has been collated by Dr Ann Read, Chemical Pathologist, and A/Prof Gish New, Director of Cardiology at Eastern Health, and prepared by Tony O’Neill from Pathology. Click here when you are ready to continue

  2. High Sensitivity Troponin (hsTnT) What is it? • Troponin (Tn) is a protein released from necrotic cardiac muscle cells. • Two forms, TnI and TnT, can be found in the circulation when even minor necrosis occurs. • Eastern Health Pathology has used a Roche TnT method since 1999 • hsTnT is the latest generation of assay and will be used across EH from 7th February 2011 onwards (replacing the existing TnT method) Assay Facts • The new assay units are ng/L (previous methods were ng/mL) • hsTnT results cannot be directly compared with the previous method • Reference Range (as defined by 99th percentile) is 0 - 14 ng/L • Almost all patients will have measurable TnT using this method, although most will be very low in the absence of ACS. Click here when you are ready to proceed Interpreting Results • A ResultInterpretation Matrix has been provided on the next page to assist with interpretation of hsTnT results • Patients who present with a clinical history suggestive of ACS and hsTnT of >100 ng/L can be provisionally diagnosed • Diagnosis of non-ST Elevation Myocardial Infarction (non-STEMI) may require demonstration of a changing hsTnT level over paired samples collected at least 3 hours apart in the window 3-12 hours post symptom onset (Delta hsTnT). • The Delta hsTnT can be calculated using the tool found in the online Pathology Handbook (the EH Intranet page) or at http://pathology.easternhealth.org.au/handbook/ Click here when you are ready to proceed Using Delta hsTnT • If Delta hsTnT is >50% and either result is >14 → supportive of ACS • If hsTnT is elevated but stable (ie Delta hsTnT is <50%) → consider other causes of myocardial injury (see below). • Non-STEMI (but not Unstable Angina) can be ruled out if both results are normal 6 hours after presentation and there are no other symptoms of ACS. A single normal result can be used if symptoms began more than 6 hours ago Click here when you are ready to proceed Clinical Application • An elevated hsTnT is abnormal and suggestive of myocardial ischaemia, although not necessarily due to ACS. Note that UA is part of the spectrum of ACS, but does not require a rise in Troponin/CK or ECG changes • When interpreting hsTnT results, the timeframe since symptom onset must be considered. Most ACS patients show a rapid rise in troponin levels 3-18 hours after the onset of chest pain, followed by a gradual decrease over a period of days • Further information regarding clinical interpretation is provided overleaf Click here when you are ready to proceed CARDIACNON CARDIAC Myocarditis Stroke / head injury drugs (alcohol, clozapine) Renal Failure / Dialysis infections Hypothyroidism autoimmune Multiple Organ Failure inflammation Septicaemia Aortic dissection Cytotoxic Drugs Pulmonary embolus Phaeochromocytoma Coronary artery embolus Coronary artery inflammation Sympathomimetics /inotropic therapy Arrhythmias (atrial /ventricular) Cardiac surgery Cardiac trauma Non-ACS causes of an elevated Troponin Click here when you are ready to proceed Agzew Y. Elevated serum cardiac troponin in non-acute coronary syndromeClin Cardiol2009; 32: 15-20 Click here when you are ready to proceed

  3. hsTnT Result Interpretation Guide Click here when you are ready to proceed

  4. ACS Classification Click here when you are ready to proceed

  5. Clinical Progression of ACS Defining ACS Over Time Acute Coronary Syndrome Guidelines Working Group Med J Aust 2006 : 184 (8 Suppl); S9-29 Click here when you have finished

  6. We hope this information has been useful for you. If you have any further questions, please do not hesitate to contact the Pathology Department at Box Hill Hospital If you have finished, please exit from Powerpoint and you will be returned to the intranet. If you wish to review this information further please click here and you will be returned to the beginning

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