Journal of Cardiac Failure
Volume 16, Issue 3 , Pages 211-217, March 2010

Exercise-Induced Delayed Onset of Left Ventricular Early Relaxation in Association With Coronary Microcirculatory Dysfunction in Patients With Diabetes Mellitus

  • Reiko Mizuno, MD, PhD

      Affiliations

    • Department of General Medicine, Nara Medical University, Nara, Japan
    • ,
  • Shinichi Fujimoto, MD, PhD, FACC

      Affiliations

    • Department of General Medicine, Nara Medical University, Nara, Japan
    • Corresponding Author InformationReprint requests: Shinichi Fujimoto, MD, PhD, FACC, Department of General Medicine, Nara Medical University, 634-8522, 840 Shijo, Kashihara, Nara, Japan. Tel: +81-744-22-3051; Fax: +81-744-24-5739.
    • ,
  • Yoshihiko Saito, MD, PhD, FAHA

      Affiliations

    • First Department of Internal Medicine, Nara Medical University, Nara, Japan
    • ,
  • Shinobu Nakamura, MD, PhD

      Affiliations

    • Department of General Medicine, Nara Medical University, Nara, Japan

Received 27 July 2009; received in revised form 24 September 2009; accepted 28 October 2009. published online 11 December 2009.

Abstract 

Background

The initiation of ventricular diastole is an energy-dependent phase of cardiac cycle. Delayed onset of left ventricular (LV) relaxation has been proposed to identify myocardial ischemia. Diabetes mellitus (DM) is known to be associated with coronary microangiopathy, but its influence on LV early relaxation is not established.

Methods and Results

Ninety-two subjects consisting of 70 DM patients without overt cardiac disease and 22 normal controls were evaluated. Using strain rate imaging, time from R-wave on the electrocardiogram to onset of LV relaxation (Tr) was measured at rest and peak exercise. Using myocardial contrast echocardiography, myocardial blood flow (MBF) was measured at rest and peak exercise, enabling MBF reserve. Tr at rest was similar between DM patients and controls, but Tr at peak exercise was significantly longer in DM patients than controls. MBF reserve was significantly reduced in DM patients compared with controls. There was a significant negative correlation between Tr at peak exercise and MBF reserve. In a multivariate analysis, MBF reserve was an independent determinant of Tr at peak exercise.

Conclusions

This study demonstrates that DM patients have exercise-induced delayed onset of LV relaxation in association with impaired coronary microcirculatory function in the absence of coexistent heart disease.

Key Words: Diabetic, diastole, echocardiography, microangiopathy

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 The authors have no conflicts to disclose.

PII: S1071-9164(09)01145-2

doi:10.1016/j.cardfail.2009.10.024

Journal of Cardiac Failure
Volume 16, Issue 3 , Pages 211-217, March 2010

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