ORIGINAL RESEARCH article
Front. Cardiovasc. Med.
Sec. Cardiovascular Imaging
Volume 12 - 2025 | doi: 10.3389/fcvm.2025.1621424
This article is part of the Research TopicAdvancements in Percutaneous Coronary Intervention: Physiology and Intravascular Imaging GuidanceView all articles
The 7-Step "P" Technique: A Novel Manual Push Method for High-Quality OCT Imaging in Severe Coronary Stenosis
Provisionally accepted
- 1Department of Cardiology,Beijing Luhe hospital,Capital Medical University, Beijing, China
- 2Department of Cardiology, Beijing Luhe Hospital, Capital Medical University, Beijing, China
- 3Emergency Department, Beijing Luhe Hospital, Capital Medical University, Beijing, China
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Background: Achieving optimal optical coherence tomography (OCT) imaging in patients with severe coronary stenosis is challenging because of the catheter-induced restriction of distal contrast flushing within the lesion.To evaluate the effectiveness of manual contrast injection followed by OCT catheter advancement in improving image clarity in patients with severe coronary stenosis.Methods: This single-centre observational study included 60 patients with acute coronary syndrome who demonstrated antegrade thrombolysis in myocardial infarction (TIMI) flow ≥ 2 on coronary angiography before the OCT catheter was passed through the severe coronary lesions. Catheter advancement resulted in TIMI 0-1 flow. A 7-step "P" technique was developed and implemented to optimise OCT imaging clarity, using manual contrast injection followed by catheter advancement distal to the region of interest (ROI). Image quality was evaluated using a semi-quantitative scoring system to assess the number of quadrants (0-4) in which the vessel walls were clearly visualised.Results: A total of 1,722 OCT frames were meticulously analysed, with a mean ROI length of 18.99 ± 8.82 mm. This technique consistently produced high-quality images with an average quality score of 3.88 ± 0.38. The proximal lesion segment generally showed a slightly higher image quality compared to the distal segment, with both regions achieving reasonably high clarity scores (3.90 ± 0.28 vs. 3.85 ± 0.45, p < 0.001) , though the clinical relevance of this difference is minimal. No complications occurred.The 7-step "P" technique with manual injection is a safe and effective method for acquiring high-quality OCT images in patients with severe coronary artery stenosis, offering a practical alternative in clinical practice.
Keywords: Catheterization, contrast injection, Optical Coherence Tomography, stenosis ACS, acute coronary syndrome PCI, Percutaneous Coronary Intervention
Received: 01 May 2025; Accepted: 17 Jul 2025.
Copyright: © 2025 Guo, He, Zhou, liu, Li, Liu, Wang and Wang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Jincheng Guo, Department of Cardiology,Beijing Luhe hospital,Capital Medical University, Beijing, China
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