UTILITY OF CORONARY ARTERY CALCIUM SCANNING IN EMERGENCY DEPARTMENT EVALUATION FOR ACUTE CHEST PAIN: THE ROMICAT II TRIAL

Introduction Obesity has been inconsistently linked with coronary artery calcium score (CACS) as a surrogate of coronary artery disease (CAD) in asymptomatic subjects. Our aim was to examine whether there is relationship between obesity defined by BMI≥30kg/m 2 and presence and severity of CAD defined by CACS in patients with acute chest pain. Methods In this cross-sectional study, 1030 consecutive patients without reported history of coronary artery disease who presented with acute chest pain were included. CACS by non-contrast CT scan and BMI were collected. Patients were categorized by CACS classifications and BMI. Results The population with mean age of 54±13 years, 33% (338 of 1030) of patients being overweight and 46% (477 of 1030) being obese consisted of 60.6% (624 of 1030) patients with zero CACS, 21.7% (223 of 1030) with mild calcification (0<CACS<100) and 17.8% (183 of 1030) with moderate-to-severe calcification (CACS≥100). Compared to non-overweight/non-obese group, obese group had less patients with moderate-to-severe calcification (69 of 477; 14.5% VS 50 of 215; 22.6% p-value=0.016) despite more patients with hypertension (311 of 477; 65.2% VS 98 of 215; 45.6% p-value<0.001), diabetes (98 of 477; 20.5% VS 11 of 215; 5.1% p-value<0.001) and hyperlipidemia(174 of 477; 36.5% VS 57 of 215; 26.5% p-value=0.010). Obesity is INVERSELY associated with presence of CACS and moderate-to-severe calcification in multivariable logistic regression analysis (table 1). Conclusion Obesity defined by body mass index ≥ 30kg/m 2 is INVERSELY associated with presence and severity of coronary artery disease defined by coronary artery calcium score in patients with acute chest pain.

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Abstract 128: A Precision Medicine Test Accurately Rules Out Obstructive Coronary Artery Disease Among Non-Diabetic Patients Presenting to Emergency Department With Acute Chest Pain

Circulation Cardiovascular Quality and Outcomes ◽

10.1161/circoutcomes.11.suppl_1.128 ◽

2018 ◽

Vol 11 (suppl_1) ◽

Author(s):

Khurram Nasir ◽

Shozab S Ali ◽

Anshul Saxena ◽

Gowtham Grandhi ◽

Usman Siddiqui ◽

...

Keyword(s):

Coronary Artery Disease ◽

Emergency Department ◽

Chest Pain ◽

Coronary Artery ◽

Obstructive Coronary Artery Disease ◽

Acute Chest Pain ◽

Diabetic Patients ◽

High Grade ◽

Intermediate Risk ◽

Artery Disease

Background: An age, sex, and blood gene expression score (ASGES) has been previously validated to detect obstructive coronary artery disease (CAD) in non-diabetic patients presenting with stable chest pain in the outpatient setting. However, the diagnostic performance of this test in ruling out obstructive CAD in patients presenting with acute chest pain (ACP) to the emergency department (ED) is unknown. Methods: In an ongoing study, 371 low-intermediate risk patients with ACP and no prior history of CAD (TIMI risk score ≤ 2, negative troponins and normal/non-diagnostic ECG) underwent coronary CT angiography (CCTA) using institutional protocols. Patients were classified based on severity of stenosis (obstructive CAD, >50%; high grade stenosis, >70%) and ASGES. The ASGES blood test sample was drawn before ED discharge and analyzed in a commercial reference laboratory (Redwood City, CA). We excluded 23 (6%) patients with unreportable ASGES and 47 (13%) diabetics from this primary analysis. Results: 301 (53±10 years, 45% males, 78% Hispanics) non-diabetic ACP patients undergoing CCTA in an ED setting were included in this analysis. No plaque was detected in 183 (60%) patients, and 22 (7%) patients had obstructive CAD. In this population, 51% of patients had scores below the previously defined threshold of ASGES≤ 15. This threshold yielded sensitivity, specificity, NPV, and PPV of 71% (52-86%), 53% (47-59%), 97% (93-98%), and 12% (9-14%) for obstructive CAD. Furthermore, ASGES≤15 yielded a 100% sensitivity and NPV for patients with high grade stenosis (n=7, 2%). In a multivariable analysis including patient demographics and clinical covariates, ASGES ≤15 was significantly associated with obstructive CAD (OR: 0.15, 95% CI: 0.04-0.62). As a continuous variable, increasing ASGES was positively correlated with the presence of obstructive CAD and CCTA-defined plaque burden (p<0.0001). Conclusions: This is the first study validating the use of this blood-based precision medicine test to rule out obstructive CAD among low-intermediate risk non-diabetic patients presenting with ACP in ED setting. 30-day follow-up is underway to evaluate the prognostic implications of these findings.

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