News | Blood Testing | September 18, 2019

Rapid Diagnosis Protocol for Chest Pain Does Not Improve Outcomes

RAPID-TnT trial presented in a Hot Line Session at ESC Congress 2019 together with WCC

Rapid Diagnosis Protocol for Chest Pain Does Not Improve Outcomes

September 18, 2019 — Discharge of patients with suspected acute coronary syndromes under a 0- and 1-hour high-sensitivity cardiac troponin T (hs-cTnT) protocol is safe, according to recent research. The late-breaking results from the RAPID-TnT trial were presented in a Hot Line Session at the European Society of Cardiology (ESC) Congress 2019, Aug. 31-Sept. 4 in Paris, France, together with the World Congress of Cardiology and published in Circulation.[1] The trial also found that better strategies are needed to optimize outcomes in patients newly diagnosed with modest troponin elevations.

Patients with chest pain were traditionally kept in the emergency room for long periods until judged safe to send home. To speed up the decision for safe discharge or rapid treatment, ESC guidelines recommend a 0/1-hour hs-cTnT protocol for patients with suspected non-ST-segment elevation myocardial infarction (NSTEMI).[2]

0/1-hour refers to the time from the first blood test. NSTEMI can be ruled out at presentation if the hs-cTnT concentration is very low. NSTEMI can also be ruled out if baseline levels are low and there is no increase within 1 hour. Patients have a high likelihood of NSTEMI if the hs-cTnT concentration at baseline is at least moderately elevated or hs-cTnT concentrations show a clear rise within the first hour.

Previous evidence for this strategy is based on observational studies. The RAPID-TnT trial investigated the safety and clinical effectiveness of a 0/1-hour protocol of troponin T reported to high-sensitivity levels versus the usual practice of cardiac troponin testing reported to previous sensitivity levels at 0, 3 and potentially 6 hours in a randomized trial prospectively embedded within care for patients with suspected acute coronary syndrome.[3]

A total of 3,288 patients with suspected acute coronary syndrome were randomly allocated to the guideline-recommended 0/1-hour hs-cTnT protocol or the 0/3-hour troponin protocol. The primary composite endpoint was all-cause death and new/recurrent myocardial infarction within 30 days of randomisation.

The 0/1-hour hs-cTnT protocol was non-inferior with respect to the primary endpoint of death or myocardial infarction at 30 days. The 0/1-hour strategy was associated with less subsequent functional (stress) testing but more angiography and revascularization. Compared to the 0/3-hour arm, patients in the 0/1-hour arm were significantly less likely to be admitted (45.5 percent versus 33.2 percent) and had a significantly shorter length of stay (5.6 versus 4.6 hours).

Principal investigator Prof. Derek Chew of Flinders University, Adelaide, Australia said, “Use of a 0/1-hour protocol for discharge is safe, since patients receiving a ‘rule-out’ recommendation had a low rate of events by 30 days (less than 1 percent). In patients recommended for further observation or ‘rule-in’ (possible acute coronary syndrome), there were more investigations and revascularization associated with more acute myocardial injury or myocardial infarction related to these procedures.”

Regarding which protocol should be used as standard in clinical practice, Chew said, “The 0/1-hour strategy can be used to reduce crowding in the emergency department. Better strategies for the increased numbers of patients who are ‘ruled in’ with this method will be required if we are to improve overall outcomes. The 12-month results from this study will help judge the true value of high-sensitivity troponin testing in clinical practice.”

For more information:


Related Content

Advantages of High Sensitivity Troponin Assays

VIDEO: Use of High Sensitivity Troponin Testing in the Emergency Department

Abbott Point-of-Care Blood Test Speeds Heart Attack Diagnosis

More Sensitive Blood Test Diagnoses Heart Attacks Faster

Siemens Launches High-sensitivity Troponin Test for Faster Diagnosis of Heart Attacks



1. Chew D.P., Lambrakis K., Blyth A., et al. A Randomized Trial of a 1-Hour Troponin T Protocol in Suspected Acute Coronary Syndromes: The Rapid Assessment of Possible ACS In the Emergency Department with High Sensitivity Troponin T (RAPID-TnT) Study. Circulation, published online Sept. 3, 2019.

2. Roffi M., Patrono C., Collet J.P., et al. 2015 ESC guidelines for the management of acute coronary syndromes in patients presenting without persistent ST-segment elevation. Eur Heart J. 2016;37:267–315. doi:10.1093/eurheartj/ehv320.

3. Papendick C., Blyth A., Seshadri A., et al. A randomized trial of a 1-hour troponin T protocol in suspected acute coronary syndromes: Design of the Rapid Assessment of Possible ACS In the emergency Department with high sensitivity Troponin T (RAPID-TnT) study. Am Heart J. 2017;190:25–33. doi: 10.1016/j.ahj.2017.05.004.

Related Content

FDA Clears Abbott's High Sensitivity Troponin-I Blood Test
Technology | Blood Testing | October 09, 2019
Abbott recently announced that its Architect Stat High Sensitivity Troponin-I blood test has received clearance from...
Validation Studies Confirm High Accuracy of Novel HART AI-Driven Blood Tests
News | Blood Testing | March 19, 2019
Prevencio Inc. announced data confirming the high accuracy of its artificial intelligence (AI)-driven, multiple-protein...
CoaguChek XS PT Test Strips Recalled for Inaccurately Reporting High INR
News | Blood Testing | December 28, 2018
Terrific Care LLC. / Medex Supply Dist Inc. initiated a nationwide recall on Dec. 19 of Roche CoaguChek test strips, as...
Abbott Point-of-Care Blood Test Speeds Heart Attack Diagnosis
News | Blood Testing | October 26, 2018
For someone experiencing cardiac symptoms in the emergency room, every minute matters as physicians determine whether...
New Noninvasive Blood Glucose Test as Effective as Finger Prick

Image courtesy of University of Missouri School of Medicine

News | Blood Testing | October 24, 2018
For those living with diabetes, monitoring blood glucose accurately is necessary to prevent diabetes-related...
Abbott Receives CE Mark for High Sensitive Troponin-I Test
News | Blood Testing | October 16, 2018
October 16, 2018 — Abbott announced that its High Sensitive Troponin-I...
AI-Driven Blood Test Accurately Diagnoses Peripheral Artery Disease in Diabetic Patient
News | Blood Testing | September 04, 2018
Prevencio Inc. announced new data demonstrating its HART PAD test accurately diagnoses peripheral artery disease (PAD)...
More Sensitive Blood Test Diagnoses Heart Attacks Faster
News | Blood Testing | August 06, 2018
August 6, 2018 — A new test to assess a whether or not someone is having a...
Singulex cTnl Assay Can Identify Presence, Severity of CAD in Stable, Symptomatic Outpatients
News | Blood Testing | March 26, 2018
March 26, 2018 — Measurement of cardiac troponin in stable patients with chest pain using the ultra-sensitive Singule
Florida Medical Center First in State to Offer High Sensitive STAT Blood Test
News | Blood Testing | September 07, 2017
In July, The Heart Institute at Florida Medical Center became the first hospital in the state of Florida to offer the U...