Rule-out of non-ST-segment elevation acute coronary syndrome by a single, pre-hospital troponin measurement: a randomized trial.

AIMS: Patients with suspected non-ST-segment elevation acute coronary syndrome (NSTE-ACS) are routinely transferred to the emergency department (ED). A clinical risk score with point-of-care (POC) troponin measurement might enable ambulance paramedics to identify low-risk patients in whom ED evaluation is unnecessary. The aim was to assess safety and healthcare costs of a pre-hospital rule-out strategy using a POC troponin measurement in low-risk suspected NSTE-ACS patients. METHODS AND RESULTS: This investigator-initiated, randomized clinical trial was conducted in five ambulance regions in the Netherlands. Suspected NSTE-ACS patients with HEAR (History, ECG, Age, Risk factors) score ≤3 were randomized to pre-hospital rule-out with POC troponin measurement or direct transfer to the ED. The sample size calculation was based on the primary outcome of 30-day healthcare costs. Secondary outcome was safety, defined as 30-day major adverse cardiac events (MACE), consisting of ACS, unplanned revascularization or all-cause death. : A total of 863 participants were randomized. Healthcare costs were significantly lower in the pre-hospital strategy (€1349 ± €2051 vs. €1960 ± €1808) with a mean difference of €611 [95% confidence interval (CI): 353-869; P < 0.001]. In the total population, MACE were comparable between groups [3.9% (17/434) in pre-hospital strategy vs. 3.7% (16/429) in ED strategy; P = 0.89]. In the ruled-out ACS population, MACE were very low [0.5% (2/419) vs. 1.0% (4/417)], with a risk difference of -0.5% (95% CI -1.6%-0.7%; P = 0.41) in favour of the pre-hospital strategy. CONCLUSION: Pre-hospital rule-out of ACS with a POC troponin measurement in low-risk patients significantly reduces healthcare costs while incidence of MACE was low in both strategies. TRIAL REGISTRATION: Clinicaltrials.gov identifier NCT05466591 and International Clinical Trials Registry Platform id NTR 7346.

Pre-hospital rule-out of non-ST-segment elevation acute coronary syndrome by a single troponin: final one-year outcomes of the ARTICA randomised trial.

BACKGROUND AND AIMS: The healthcare burden of acute chest pain is enormous. In the randomised ARTICA trial we showed that pre-hospital identification of low-risk patients and rule-out of non-ST-segment elevation acute coronary syndrome (NSTE-ACS) with point-of-care (POC) troponin measurement reduces 30-day healthcare costs with low major adverse cardiac events (MACE) incidence. Here we present the final one-year results of the ARTICA trial. METHODS: Low-risk patients with suspected NSTE-ACS were randomised to pre-hospital rule-out with POC troponin measurement or emergency department (ED) transfer. Primary one-year outcome was healthcare costs. Secondary outcomes were safety, quality of life (QoL) and cost-effectiveness. Safety was defined as one-year MACE, consisting of ACS, unplanned revascularisation or all-cause death. QoL was measured with EuroQol-5D-5 L questionnaires. Cost-effectiveness was defined as one-year healthcare costs difference per QoL difference. RESULTS: Follow-up was completed in all 863 patients. Healthcare costs were significantly lower in the pre-hospital strategy (€1932±€2784 vs €2649±€2750), mean difference €717 (95% confidence interval [CI] €347 to €1087; P < 0.001). In the total population, one-year MACE rate was comparable between groups (5.1% [22/434] in the pre-hospital strategy vs 4.2% [18/429] in the ED strategy; P = 0.54). In the ruled-out ACS population, one-year MACE remained low (1.7% [7/419] vs 1.4% [6/417]), risk difference 0.2% (95% CI -1.4% to 1.9%; P = 0.79). QoL showed no significant difference between strategies. CONCLUSIONS: Pre-hospital rule-out of NSTE-ACS with POC troponin testing in low-risk patients is cost-effective, expressed by a sustainable healthcare costs reduction and no significant effect on QoL. One-year MACE remained low for both strategies. Trial registration: Clinicaltrials.gov: NCT05466591, International Clinical Trials Registry Platform: NTR7346.

Differences in risk and costs between prehospital identified low-risk men and women with chest pain.

OBJECTIVE: Prehospital rule-out of non-ST-segment elevation acute coronary syndrome (NSTE-ACS) in low-risk patient with a point-of-care troponin measurement reduces healthcare costs with similar safety to standard transfer to the hospital. Risk stratification is performed identical for men and women, despite important differences in clinical presentation, risk factors and age between men and women with NSTE-ACS. Our aim was to compare safety and healthcare costs between men and women in prehospital identified low-risk patients with suspected NSTE-ACS. METHODS: In the Acute Rule-out of non-ST-segment elevation acute coronary syndrome in the (pre)hospital setting by HEART (History, ECG, Age, Risk factors and Troponin) score assessment and a single poInt of CAre troponin randomised trial, the HEAR (History, ECG, Age and Risk factors) score was assessed by ambulance paramedics in suspected NSTE-ACS patients. Low-risk patients (HEAR score ≤3) were included. In this substudy, men and women were compared. Primary endpoint was 30-day major adverse cardiac events (MACE), secondary endpoints were 30-day healthcare costs and the scores for the HEAR score components. RESULTS: A total of 863 patients were included, of which 495 (57.4%) were women. Follow-up was completed in all patients. In the total population, MACE occurred in 6.8% of the men and 1.6% of the women (risk ratio (RR) 4.2 (95% CI 1.9 to 9.2, p<0.001)). In patients with ruled-out ACS (97% of the total population), MACE occurred in 1.4% of the men and in 0.2% of the women (RR 7.0 (95% CI 2.0 to 14.2, p<0.001). Mean healthcare costs were €504.55 (95% CI €242.22 to €766.87, p<0.001) higher in men, mainly related to MACE. CONCLUSIONS: In a prehospital population of low-risk suspected NSTE-ACS patients, 30-day incidence of MACE and MACE-related healthcare costs were significantly higher in men than in women. TRIAL REGISTRATION NUMBER: NCT05466591.