# Tissue Doppler Imaging Provides Incremental Value in Predicting Six Months In-Stent Restenosis in Patients with Coronary Artery Disease

## TL;DR

Tissue Doppler Imaging helps predict in-stent restenosis six months after heart procedures in coronary artery disease patients.

## Contribution

This study shows TDI's potential as a non-invasive predictor of in-stent restenosis after PCI.

## Key findings

- A mean TpV ≥ 279.6 ms at six months after PCI indicates in-stent restenosis.
- Patients without ISR showed a significant decrease in TpV standard deviation.
- TDI echocardiography is promising for detecting ISR six months post-PCI.

## Abstract

Background: Invasive coronary angiography is the gold standard for assessing in-stent restenosis (ISR) in patients with coronary artery disease. However, the predictive value of non-invasive Tissue Doppler Imaging (TDI) to evaluate patients with ISR has not been studied extensively. Methods: A total of 41 patients (19 with acute myocardial infarction and 22 with stable angina pectoris) who received percutaneous coronary intervention (PCI) were enrolled in the study. Time-to-peak velocities (TpV) of 12 non-apical segments of the left ventricle, by pulse wave TDI echocardiography, were obtained within two days prior to the PCI and six months later. Results: A 12-segmental mean TpV ≥ 279.6 ms at six months after PCI was able to detect ISR (odds ratio: 2.09, 95% CI 1.004–4.352, p = 0.049). Moreover, a significant decrease in the standard deviation of TpV was demonstrated in patients without ISR (85.8 ± 44.8 vs. 60.3 ± 31.7 ms, p = 0.001), but not in patients with ISR (97.7 ± 53.3 vs. 91.2 ± 52.6 ms, p = 0.57). Conclusions: Pulse-wave TDI echocardiography is a promising tool in the detection of ISR six months after PCI in patients with coronary artery disease.