CTA vs Stress Testing

Introduction

• Presentation on Press Testing or CT Coronary Angiography

• Presenter: Patty Bowen

• No disclosures made

Learning Objectives

• Review stress testing sensitivity and specificity for coronary artery disease (CAD)

• Discuss the advantages and disadvantages of coronary CTA for evaluating chest pain

• Compare coronary CTA with traditional stress testing

Stress Testing Overview

• Historically, stress testing has been the gold standard for non-invasive CAD evaluation

• Useful for prognosis in patients with known and unknown CAD

• Important at initial evaluation for possible angina

• Helps assess ischemia extent and myocardium viability

Prognostic Factors

• Key predictors include:

  • Low exercise capacity

  • Early onset angina

  • Low peak systolic blood pressure

  • Prolonged exercise recovery time

• Imaging tests used when:

  • Baseline ECG abnormalities are present

  • Treadmill tests suggest intermediate risk

Imaging Modalities

• Options include:

  • Echocardiography

  • SPECT imaging

  • PET imaging

  • MRI

• Sensitivities and specificities for common tests:

  • Treadmill ECG: Sensitivity 70%, Specificity 77%

  • SPECT NIBY: Sensitivity 88%, Specificity 77%

  • Stress Echocardiogram: Sensitivity 85%, Specificity 77%

  • PET Imaging: Sensitivity 91%, Specificity 82%

Evolution of Coronary CTA

• Improvements in sensitivity and radiation exposure over time

• Current sensitivity: 98%; Specificity: 82%

• Challenges with patients:

  • High heart rates

  • Presence of previous stents or extensive calcifications

• Excellent negative predictive value (annual MI/cardiac death risk = 0.04%)

Comparative Studies

• PET vs. SPECT vs. Coronary CTA:

  • PET shows slightly higher sensitivity for myocardial ischemia

  • Coronary CTA similarly sensitive as PET in some studies

• Scott Hart Trial:

  • Compared outcomes of patients with standard care vs. primary CTA

  • Resulted in lower rates of non-fatal myocardial infarction in CTA group

PROMISE Trial

• Included 10,000 symptomatic patients with angina

• Compared coronary CTA and stress testing

• No significant differences in overall adverse events

• Higher cardiac catheterization utilization in CTA group (12% vs. 8%)

  • Better identification of obstructive disease

• Radiation exposure lower in the coronary CTA group compared to SPECT

Meta-Analyses Findings

• Analyses of 13 trials with over 10,000 patients showed:

  • No overall difference in mortality between modalities

  • Higher incidence of MI in stress testing group

  • Greater use of coronary interventions in coronary CTA group

Clinical Cases

Case 1: 59-Year-Old Male

• History: GERD, hypertension, family history of CAD

• Presented with episodes of chest pain, negative troponins and ECGs

• Chose coronary CTA due to high negative predictive value

• Results: Severe stenosis in mid-right coronary artery diagnosed

• Benefit: Quick diagnosis led to timely cardiac catheterization and intervention

Case 2: 72-Year-Old Male

• History: Hypertension, diabetes, previous CABG

• New symptoms while active; stress testing preferred to assess ischemia

• Exercise test showed moderate inferior defect, managed medically

Case 3: 84-Year-Old Female

• History: Abnormal stress test, prior cardiac issues including spasm

• Evaluated for new CAD; underwent coronary CTA

• Results: Minimal obstructive disease found, medication adjustment made

Conclusions

• Coronary CTA is increasingly favored for chest pain diagnosis in patients with no prior CAD

• If minimal plaque seen, consider deferring ASA; start ASA if moderate or more

• Utilization still limited; need for lower heart rates and local expertise

• Stress testing remains valuable for known CAD, especially post-CABG

• Reconsidering strategies is essential given coronary CTA’s advantages

• Ongoing assessment of methods continues to optimize patient outcomes.