Coronary CT angiography (CCTA) using third-generation dual-source CT for ruling out in-stent restenosis

Area of Science:

• Cardiovascular Imaging
• Interventional Cardiology
• Radiology

Background:

• Late in-stent restenosis (ISR), often due to neo-atherosclerosis, is a growing clinical concern.
• Coronary computed tomography angiography (CCTA) is sensitive for detecting coronary plaques, but its accuracy for ISR diagnosis remains debated.
• Stent artifacts can compromise CCTA image quality, necessitating advanced CT technology for improved diagnostic performance.

Purpose of the Study:

• To evaluate the diagnostic accuracy of CCTA in detecting in-stent restenosis (ISR) in patients with prior coronary revascularization.
• To assess the potential of CCTA to exclude ISR and reduce the need for invasive coronary angiography (ICA).

Main Methods:

• A prospective study involving 226 patients with prior coronary stent implantation underwent CCTA using a third-generation dual-source CT scanner.
• Patients were monitored for major adverse cardiovascular events (MACE) over a mean follow-up of 399 days.
• High-grade stenoses identified by CCTA were confirmed with invasive coronary angiography (ICA); unclear findings were further evaluated by ICA or functional testing.

Main Results:

• CCTA successfully ruled out ISR in 64% of patients; only one MACE occurred in this group.
• Definite ISR was detected by CCTA in 10% of patients, confirmed by ICA.
• The false-negative rate for ISR detection by CCTA was low (<1%), while false-positive or inconclusive findings occurred in 25% of cases, prompting ICA in 12% of patients.

Conclusions:

• CCTA is a valuable tool for safely excluding in-stent restenosis (ISR) in symptomatic patients with previous stenting.
• The high negative predictive value of CCTA may help avoid unnecessary invasive diagnostic procedures.
• Further research is needed to clarify the impact of stent dimensions and number on CCTA accuracy for ISR detection.