Study on the Improvement of Myocardial Microcirculation After Acute Anterior Myocardial Infarction

Condition(s) studied

Investigational drug(s) / intervention(s)

OCT-guided PCI: The OCT guidance team routinely conducts OCT examinations on patients after standard angiography and/or thrombus aspiration. The OCT examination follows a standard procedure. The operator evaluates the stability of the lesion and decides whether to proceed with stent implantation therapy (with the option to choose the type of stent) or opt for conservative medical treatment. If a stent is implanted, the procedure is carried out according to guidelines and standard protocols, with the landing zone of the stent determined based on OCT image features. After stent implantation, a follow-up OCT examination of the stent segment, as well as angiographic examination, is performed. Based on the OCT results, the operator decides whether post-dilation is necessary.

60 MHz HD-IVUS-guided PCI: The IVUS guidance team routinely conducts IVUS examinations on patients after standard angiography and/or thrombus aspiration. The IVUS examination follows a standard procedure. The operator evaluates the stability of the lesion and decides whether to proceed with stent implantation therapy (with the option to choose the type of stent) or opt for conservative medical treatment. If a stent is implanted, the procedure is carried out according to guidelines and standard protocols, with the landing zone of the stent determined based on IVUS image features. After stent implantation, a follow-up IVUS examination of the stent segment, as well as angiographic examination, is performed. Based on the IVUS results, the operator decides whether post-dilation is necessary.

Angiography-guided PCI: After routine angiography and/or thrombus aspiration, the operator assesses the lesion based on treatment standards to determine whether stent implantation is necessary. For patients undergoing stent implantation, a follow-up angiography is performed postoperatively, and the decision for post-dilation is made by the operator based on experience.

Study summary

This study is a prospective, single-center, randomized controlled clinical trial. Ninety patients with anterior wall ST-segment elevation myocardial infarction (STEMI) who are planned for primary percutaneous coronary intervention (PCI) within 6 hours of symptom onset will be screened. Patients with inclusion criteria and without exclusion criteria will be randomized into three groups in a 1:1:1 ratio: OCT-guided group, 60 MHz HD-IVUS-guided group, and angiography-guided group after signing the informed consent form.

Based on the lesion characteristics detected by imaging in each group, coronary revascularization will be performed for the culprit vessels of myocardial infarction. The TIMI myocardial perfusion frame count (TMPFC) values of the culprit vessels will be recorded immediately after PCI, and secondary prevention medications for myocardial infarction will be administered. Three days after the procedure, a 3.0T cardiac magnetic resonance imaging (MRI) with gadolinium diethylenetriaminepentaacetic acid (Gd-DTPA) delayed enhancement (LEG) scan will be conducted to assess the microvascular obstruction (MVO) area.

Patients will be followed in the outpatient clinic visit at 1 month (with a window period of XX days) after discharge, and a repeat cardiac MRI will be performed to determine the presence of MVO and the size of the myocardial infarction.

Eligibility

Primary outcome measure(s)

• Microvascular obstruction (MVO) assessed by cardiac magnetic resonance imaging (CMR) — Three days after percutaneous coronary intervention (PCI)
  The area of microvascular obstruction (MVO) assessed by cardiac magnetic resonance imaging (CMR) three days after percutaneous coronary intervention (PCI).

Trial sites (1)

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