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Optical coherence tomography visualization of stent deformation with subsequent thrombus adhesion at very early phase after everolimus-eluting stent implantation: a case report
© The Author(s). 2016
Received: 31 October 2015
Accepted: 20 May 2016
Published: 31 May 2016
Stent malapposition, stent fracture, and deformity, and inadequate anti-thrombotic therapy are known as the risk of stent thrombosis. We report a case of stent deformation with subsequent thrombus adhesion at the site of a partial stent fracture detected by intravascular ultrasound (IVUS) and optical coherence tomography (OCT).
A 61-year-old male patient was diagnosed as effort angina pectoris. Coronary angiography revealed obstructions in the proximal segment of the left anterior descending (LAD) and left circumflex artery (LCx). Elective percutaneous coronary intervention (PCI) was scheduled for these lesions in the prior hospital. First, an everolimus-eluting stent (EES) was implanted in the just proximal LAD slightly protruding into left main trunk. One week later, the treatment to residual obstruction at proximal LCx was attempted. During delivery of the stent to LCx, the proximal edge of the previously-implanted LAD stent got stuck with the newly-deploying stent and deformed into the intravascular lumen when retracting the stent into the guide-catheter. He was immediately transferred to our hospital to repair these procedural problems. Two days later after the index procedure to LCx, intracoronary imaging with an IVUS and OCT were performed, and the IVUS/OCT imaging revealed thrombus adhesion around the deformed struts. The three-dimensional OCT guide also helped the detection of the deformed stent and the repair of deformed struts by additional stenting and kissing balloon technique.
The current case suggested that thrombus adhesion can occur at the site of deformed and/or fractured stent at very early phase after stent implantation.
Drug-eluting stents (DES) reduce in-stent restenosis rate compared with bare-metal stents . However, incomplete stent dilatation, stent fracture, deformity, and inadequate anti-thrombotic therapy are still known as the risk of stent thrombosis [2, 3]. Sent fracture has been reported in 1 to 2 % of patients after DES implantation, and that could cause stent thrombosis at early phase after stent implantation . However, we might not always perceive the thrombus if the patients were asymptomatic, or no evidence of myocardial ischemia after the procedure of percutaneous coronary intervention (PCI).
Optical coherence tomography (OCT) is a technology which can capture micrometer resolution. OCT can provide real time and cross-sectional images of tissue structure including in situ thrombus. OCT could also detect stent fracture and early thrombus adhesion at the site of stent fracture . OCT might prevent the coronary events complicated with early stent thrombosis.
Here, we report an interesting case of stent deformation with subsequent very early thrombus adhesion detected by intravascular ultrasound (IVUS) and OCT.
His vital sign was stable without any sing of angina or heart failure. Routine laboratory data were almost within normal limit. Electrocardiogram showed no ST-T changes. Transthoracic echocardiogram showed severely-decreased posterior wall motion with evidence of old myocardial infarction.
We decided to perform additional PCI to repair the stent deformity. A 3.5x23mm EES was deployed from the left main trunk (ostium) to middle LAD to completely cover the prior implanted stent. Postdilatation using 3.5x15 mm and 3.0x15 mm non-compliant balloons was performed at the bifurcation of LAD-LCx to attempt a kissing balloon inflation at the end of the procedure (Fig. 1c). After these procedure, we confirmed that there were not any coronary dissection and hematoma with adequate stent expansion using IVUS and OCT (Fig. 2b).
After this procedure, he did not experience chest pain and have no ST-T changes on the electrocardiogram. Eleven months later, we performed follow-up exercise test, CAG, IVUS and OCT to confirm whether myocardial ischemia and any structural problems of implanted stent occurred. There were no evidence of ischemia without restenosis and hematoma at that lesion (Fig. 2c).
Early stent thrombosis is closely related to high risk of myocardial infarction (MI) and mortality. The rate of stent thrombosis within 30 days is 1.4 % in patients with stable coronary artery disease . There are no differences in the rate of early stent thrombosis between bare metal stents (BMS) and DES. Stent thrombosis is mainly caused by procedure-related factors such as insufficient inflation pressure, incomplete stent apposition, stent fracture (SF), dissection, and inadequate antiplatelet therapy [2, 3].
The incidence of SF of EES is 2.9 %. SF is associated with high risk of major adverse cardiovascular events . The incidence of stent thrombosis after EES implantation is 0.3 % , and several cases of early stent thrombosis detected by IVUS and OCT have been previously reported [9, 10]. However, there was no report that demonstrated the thrombus adherence at early phase after EES implantation on the fractured stent struts by OCT.
Here, we first reported that OCT could detect the stent deformation with subsequent very early thrombus adhesion (3 days after PCI). With regard to OCT-guided PCI, generally, we have to check the mechanical complication such as edge dissection, stent underexpansion, or malapposition. In this case, as the patient complained of no chest pain, and CAG could not detect thrombus, if OCT or IVUS had not been employed, thrombus might become enlarged, and devastating myocardial infarction due to stent thrombosis could occurred. In such cases of stent fracture, we might have to check the existence of thrombus at the site of stent fracture by OCT, and repair the deformed stent as soon as possible if needed.
Mechanical abnormality of coronary stenting and inadequate antiplatelet therapy can result in early stent thrombosis. OCT could be valuable to detect stent fracture and early thrombus adhesion to prevent serious subsequent complication such as myocardial infarction and sudden cardiac death.
BMS, bare metal stents; CAG, coronary angiography; DES, drug-eluting stents; EES, everolimus-eluting stent; IVUS, intravascular ultrasound; LAD, left anterior descending artery; LCx, left circumflex artery; MI, myocardial infarction; OCT, optical coherence tomography; PCI, percutaneous coronary intervention
This work was supported in part by a Grant-in-Aid for Young Scientists B (22790713, 24790769), a Grant-in-Aid for Scientific Research C (26461075) from the Ministry of Education, Science, and Culture, Japan, and a Grant for Scientific Research from Fukuda Foundation for Medical Technology, Japan (to Dr. Tsujita).
Availability of data and materials
All the data supporting our findings is contained within the manuscript.
SY and KT, conception and design, analysis and interpretation of data, manuscript writing. SY, KF and YM, attending physician, KT and SK, acquisition and analysis of data, revising it critically for important intellectual content. KK, SH and HO, interpretation of data, revising it critically for important intellectual content. All authors read and approved the final manuscript.
The authors declare that they have no competing interests.
Consent for publication
Written informed consent was obtained from the patient for publication of this case report and any accompanying data. A copy of the written consent is available for review by the Editor of this journal.
Ethics approval and consent to participate
This report was based on the approval for publication of the case report and any accompanying data by the Human Ethics Review Committee of Kumamoto University Graduate School of Medicine.
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