Estimation of Regional Left Ventricular Function Using Color Kinesis After Percutaneous Coronary Intervention for Chronic Total Occlusion of the Left Coronary Artery

  • Dr Michiko Ichihara, Department of Cardiology and Department of Clinical Labolatory, Japan
  • Dr Sayuki Kobayashi, Department of Cardiology and Department of Clinical Labolatory, Japan
  • Dr Michiko Minai, Department of Cardiology and Department of Clinical Labolatory, Japan
  • Dr Hiroko Zenri, Department of Cardiology and Department of Clinical Labolatory, Japan
  • Dr Ryuji Chida, Department of Cardiology and Department of Clinical Labolatory, Japan
  • Dr Yoshihiko Sakai, Department of Cardiology and Department of Clinical Labolatory, Japan
  • Dr Kan Takayanagi, Department of Cardiology and Department of Clinical Labolatory, Japan

    • Background: Percutaneous coronary intervention (PCI) for chronic total occlusion (CTO) actively proceeded according to the technical advances in the design of angioplasty equipment. A few reports have described global left ventricular function with successful recanalization after coronary intervention. However, regional left ventricular function after PCI for CTO has not been described. Color kinesis ( CK ) ( Philips Medical System ) is a development that facilitates the echocardiographic evaluation of regional diastolic wall motion.
    Purpose: The present study estimates regional left ventricular diastolic function using CK after successful recanalization for CTO.
    Methods: Ten patients with successful recanalization for CTO of the left coronary artery were examined by echocardiography one day before, as well as one day and 6 months after PCI.
    We evaluated regional diastolic wall motion using CK from the LV mid papillary short-axis view. The LV segmental filling fraction during the first 30% of the diastolic filling time, expressed as CK-diastolic index ( CK-DI ) ( % ), was used to objectively identify the regional diastolic function of the left ventricle.
    Results: The CK-DI of the interventricular septum was higher at 6 months after PCI than at either one day before (p < 0.001) or one day after (p < 0.05) PCI. However, the CK-DI of other segments was not significantly altered.
    Conclusion: We suggest that the regional diastolic function of the target region was improved by successful recanalization after PCI for chronic CTO, indicating that PCI under this condition could improve left ventricular function.