A Second Heart Attack After Stenting: How IVUS Guided Treatment for an Enlarged Coronary Artery
Seven Years After Stenting, Another Heart Attack Happened
William was 58 years old, overweight, and had hypertension, diabetes, and hyperlipidemia. Seven years earlier, he had undergone stent implantation for coronary artery disease.
Eight days before this admission, he suffered another acute myocardial infarction and was urgently hospitalized.
Angiography showed that the situation was more complicated than expected. His right coronary artery was diffusely aneurysmal, the old stent contained thrombus, and the vessel diameter was obviously abnormal.
In a typical adult, the main coronary artery diameter is often around 2.5–3.5 mm. William's right coronary artery reference segment measured approximately 4.0–5.0 mm, meaning that conventional stent sizing would not be enough.
Prior stent history · RCA diameter 4.0–5.0 mm · High risk of poor stent apposition and thrombosis
IVUS Became the Doctor's Third Eye
Because William's coronary anatomy was unusual, Dr. Chen's team decided to perform the second intervention under intravascular ultrasound, or IVUS, guidance.
IVUS can clearly show the vessel wall structure, plaque characteristics, stent expansion, and whether the stent is well apposed to the vessel wall.
Before treatment, IVUS showed multiple unstable plaques and a high risk of poor stent apposition. Without precise imaging guidance, such a large vessel could easily lead to underexpansion or malapposition, increasing the risk of future thrombosis.
"In complex coronary lesions, imaging guidance can turn stenting from a standard procedure into a personalized strategy."
Precision Strategy — Large-Diameter Stents and Balloon Optimization
Under real-time IVUS guidance, the team created a customized plan for William's enlarged vessel.
- Diffuse aneurysmal enlargement of the RCA
- Old stent thrombosis
- Unusually large vessel diameter
- High risk of stent malapposition
- Higher risk of restenosis and thrombosis
- Large-diameter 4.5 mm and 4.0 mm stents selected
- Stents implanted in series
- 5.0 mm balloon used for repeated post-dilation
- IVUS confirmed full expansion and good apposition
- No dissection or tissue prolapse detected
Final angiography showed that blood flow had recovered to TIMI 3. William's chest tightness and chest pain were completely relieved.
After the Procedure — Long-Term Management Was Just as Important
William's condition was special because patients with coronary artery ectasia have a higher baseline risk of thrombosis. For this reason, Dr. Chen's team created a discharge plan that went far beyond stenting alone.
The plan included triple antithrombotic therapy for high thrombotic risk, intensive lipid lowering with a target LDL-C below 1.4 mmol/L, blood sugar control, blood pressure control, weight reduction, gastric protection, a low-salt and low-fat diet, appropriate exercise, and regular follow-up.
William had recurrent myocardial infarction, old stent thrombosis, and aneurysmal RCA enlargement.
IVUS guided large-diameter stent selection and 5.0 mm balloon post-dilation.
Antithrombotic therapy, lipid control, glucose control, weight management, and follow-up became essential.
"The stent repairs the road, but the long-term quality of that road depends on daily medication and lifestyle control."
— Dr. Chen
William's case is a reminder that having a stent placed does not mean coronary disease is cured forever. Long-term follow-up, imaging-guided precision treatment, and comprehensive risk-factor management are all essential for preventing another event.