1. Keiichi Hishikari

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    1. Mentioned In 13 Articles

    2. The clinical significance of echo-attenuated plaque in stable angina pectoris compared with acute coronary syndromes: A combined intravascular ultrasound and optical coherence tomography study

      The clinical significance of echo-attenuated plaque in stable angina pectoris compared with acute coronary syndromes: A combined intravascular ultrasound and optical coherence tomography study
      Background Echo-attenuated plaque (EA) on intravascular ultrasound (IVUS) is related to poor outcomes after percutaneous coronary intervention (PCI) in acute coronary syndrome (ACS) patients. However, the clinical significance of EA in stable angina pectoris (SAP) patients compared with that in ACS patients remains unclear. We assessed the relationships between EA and unstable plaque characteristics in patients with ACS and SAP. Methods We investigated 609 coronary lesions in 609 patients (234 ...
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    3. Relationship between quantities of tissue prolapse after percutaneous coronary intervention and neointimal hyperplasia at follow-up on serial optical coherence tomography examination

      Relationship between quantities of tissue prolapse after percutaneous coronary intervention and neointimal hyperplasia at follow-up on serial optical coherence tomography examination
      The clinical significance of the extent of tissue prolapse (TP) after percutaneous coronary intervention (PCI) for long-term outcomes remains undetermined. This study investigated the relationship between the quantities of TP immediately after PCI and neointimal hyperplasia (NIH) at follow-up on serial optical coherence tomography (OCT) examination.
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    4. Impact of optical coherence tomography- and coronary angioscopy-assessed neointimal tissue characteristics on occurrence of periprocedural myonecrosis in patients with in-stent restenosis

      Impact of optical coherence tomography- and coronary angioscopy-assessed neointimal tissue characteristics on occurrence of periprocedural myonecrosis in patients with in-stent restenosis
      Several characteristics of neointimal tissues, including neoatherosclerotic progression, have been reported in lesions with in-stent restenosis (ISR). However, the effects of these characteristics on outcomes after percutaneous coronary intervention (PCI) for ISR lesions remain unclear. We assessed the relationships between neointimal tissue characteristics and the occurrence of periprocedural myonecrosis (PMN) after PCI in ISR lesions. We investigated 72 ISR lesions in 72 patients with stable angina pectoris (SAP) who underwent ...
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    5. Impact of chronic kidney disease stages on atherosclerotic plaque components on optical coherence tomography in patients with coronary artery disease

      Impact of chronic kidney disease stages on atherosclerotic plaque components on optical coherence tomography in patients with coronary artery disease
      The progression of coronary atherosclerosis has been influenced by the presence of chronic kidney disease (CKD). This study investigated the impact of CKD stages on coronary plaque components observed on optical coherence tomography (OCT). We investigated 296 native coronary lesions with stable angina pectoris treated with stent implantation. All lesions were divided into the three groups according to the values of estimated glomerular filtration rate (eGFR, mL min 1 1 ...
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    6. Association of Intravascular Ultrasound- and Optical Coherence Tomography-Assessed Coronary Plaque Morphology With Periprocedural Myocardial Injury in Patients With Stable Angina Pectoris

      Association of Intravascular Ultrasound- and Optical Coherence Tomography-Assessed Coronary Plaque Morphology With Periprocedural Myocardial Injury in Patients With Stable Angina Pectoris
      Background: Periprocedural myocardial injury (PMI) is not an uncommon complication and is related to adverse cardiac events after percutaneous coronary intervention (PCI). We investigated the predictors of PMI in patients with stable angina pectoris (SAP) on intravascular imaging. Methods and Results: We enrolled 193 SAP patients who underwent pre-PCI intravascular ultrasound (IVUS) and optical coherence tomography (OCT). Clinical characteristics, lesion morphology, and long-term follow-up data were compared between patients with ...
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    7. Relationship Between Subclinical Cardiac Troponin I Elevation and Culprit Lesion Characteristics Assessed by Optical Coherence Tomography in Patients Undergoing Elective Percutaneous Coronary Intervention

      Relationship Between Subclinical Cardiac Troponin I Elevation and Culprit Lesion Characteristics Assessed by Optical Coherence Tomography in Patients Undergoing Elective Percutaneous Coronary Intervention
      ...nary Intervention 1. Tetsumin Lee, MD, 2. Tadashi Murai, MD, 3. Taishi Yonetsu, MD, 4. Asami Suzuki, MD, 5. Keiichi Hishikari, MD, 6. Yoshihisa Kanaji, MD, 7. Junji Matsuda, MD, 8. Makoto Araki, MD, 9. Takayuki Niida, ...
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    8. Quantitative Assessment of Tissue Prolapse on Optical Coherence Tomography and its Relation with Underlying Plaque Morphologies and Clinical Outcome in Patients with Elective Stent Implantation

      Quantitative Assessment of Tissue Prolapse on Optical Coherence Tomography and its Relation with Underlying Plaque Morphologies and Clinical Outcome in Patients with Elective Stent Implantation
      Background Tissue prolapse (TP) is sometimes observed after percutaneous coronary intervention (PCI), but its clinical significance remains unclear. We investigated the relationship between TP volume on optical coherence tomography (OCT) after PCI and underlying plaque morphologies, and the impact of TP on clinical outcomes. Methods We investigated 178 native coronary lesions with normal pre-PCI creatine kinase-myocardial band (CK-MB) values (154 lesions with stable angina; 24 with unstable angina). TP was ...
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    9. In vivo detection of lipid-rich plaque by using a 40-MHz intravascular ultrasound: a comparison with optical coherence tomography findings

      In vivo detection of lipid-rich plaque by using a 40-MHz intravascular ultrasound: a comparison with optical coherence tomography findings
      iMAP has recently been introduced as a new tissue characterization method using the 40-MHz intravascular ultrasound (IVUS). However, few data have been published on the comparative findings of other imaging modalities in vivo. We examined 108 matched lesions from 70 patients (35 with stable angina and 35 with acute coronary syndrome) that underwent percutaneous coronary intervention (PCI) using pre-PCI OCT and IVUS. Identification of OCT-derived lipid-rich plaques and thin-cap fibroatheroma ...
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    10. Impact of Coronary Plaque Morphology Assessed by Optical Coherence Tomography on Cardiac Troponin Elevation in Patients With Elective Stent Implantation

      Impact of Coronary Plaque Morphology Assessed by Optical Coherence Tomography on Cardiac Troponin Elevation in Patients With Elective Stent Implantation
      Background—Mild elevations of cardiac troponin frequently occur after percutaneous coronary intervention (PCI), and patients with elevated post-PCI biomarkers have a worse prognosis. We used optical coherence tomography (OCT) to study the relationship between pre-PCI plaque morphology and post-PCI cardiac troponin I elevations. Methods and Results—One hundred thirty-one patients with normal pre-PCI cardiac troponin I levels underwent OCT before nonemergency stent implantation. Clinical and OCT findings were compared between ...
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    11. Feature Of The Week 6/26/11: Thin Coronary Artery Walls Covering Plaque Can Lead to Rupture and Death. How Thin is Too Thin?

      Feature Of The Week 6/26/11: Thin Coronary Artery  Walls Covering Plaque Can Lead to Rupture and Death. How Thin is Too Thin?
      The study of rupture-prone plaques or vulnerable plaque is an active area of research around the world that has been buoyed with the power of both research systems and St. Jude Medical's commercially available intravascular OCT system to provide detailed high-resolution in-vivo images of the coronary artery and other arteries. Researchers from Tsuchiura Kyodo Hospital recently published in this area. A summary of their work is give below.Plaque ...
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    12. In vivo critical fibrous cap thickness for rupture-prone coronary plaques assessed by optical coherence tomography

      In vivo critical fibrous cap thickness for rupture-prone coronary plaques assessed by optical coherence tomography
      Aims The widely accepted threshold of <65 μm for coronary plaque fibrous cap thickness was derived from postmortem studies of ruptured plaques and may not be appropriate for in vivo rupture-prone plaques. We investigated the relationship between fibrous cap thickness and plaque rupture using optical coherence tomography (OCT). Methods and results We studied 266 lesions (103 from patients with acute coronary syndrome and 163 from patients with stable angina) before ...
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  2. About Keiichi Hishikari

    Keiichi Hishikari is a Cardiologist in the Division of Cardiology at Tsuchiura Kyodo General Hospital in Japan.