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First published online November 12, 2009, 10.2967/jnumed.109.066068
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Journal of Nuclear Medicine Vol. 50 No. 12 1993-1998
© 2009 by Society of Nuclear Medicine
doi: 10.2967/jnumed.109.066068

Clinical Investigation

Changes in Cerebral Blood Flow Detected by SPECT in Type 1 and Type 2 Diabetic Patients

Miklós Káplár1, György Paragh1, Annamária Erdei1, Éva Csongrádi1, Éva Varga1, Ildikó Garai2, Lajos Szabados2, László Galuska2 and József Varga2

1 1st Department of Internal Medicine, University of Debrecen Medical and Health Science Center, Debrecen, Hungary; and 2 Department of Nuclear Medicine, University of Debrecen Medical and Health Science Center, Debrecen, Hungary

Correspondence: For correspondence or reprints contact: Miklós Káplár, University of Debrecen Medical and Health Science Center, 1st Department of Internal Medicine, H-4012 Debrecen, Nagyerdei krt. 98, Hungary. E-mail: mkaplar{at}internal.med.unideb.hu

Although macrovascular complications are typical for type 2 diabetes mellitus (T2DM), cerebral microvascular damage develops both in type 1 diabetes mellitus (T1DM) and T2DM. Color Doppler ultrasound is widely used for the examination of large- and medium-sized arteries, whereas SPECT and MRI are capable of identifying disturbances in the circulation of microvessels. Former studies using semiquantitative methods showed reduced reactivity and reserve capacity of cerebral vessels in both T1DM and T2DM patients. Our aim was to investigate whether there was any difference in the effects of the 2 types of diabetes mellitus on the global or regional cerebral blood flow, influenced by microvascular damage. Methods: In our study, the circulation and reserve capacity of cerebral arteries was examined using 99mTc-hexamethylpropylene amine oxime SPECT. A total of 17 individuals with T1DM and 43 individuals with T2DM were involved in the study. Results: Both basal and acetazolamide-challenged brain circulation were significantly lower in T2DM patients than in T1DM patients. We did not find a significant difference in the reserve capacity. However, the circulation of the frontal and occipital lobes changed differently in the 2 groups. The ratio of the circulation of the frontal and occipital lobes was significantly reduced both in basal and in acetazolamide-stimulated states in T2DM patients, independently of age (P < 0.0005 and P < 0.017), showing a greater relative decrease in the circulation of the frontal lobe in T2DM patients. Conclusion: There was a significant association between basal brain circulation and age, body mass index, and high-density lipoprotein (HDL), whereas acetazolamide-stimulated circulation showed a significant association with serum triglyceride and HDL.

Key Words: diabetes mellitus • cerebral perfusion • SPECT • reserve capacity • frontooccipital ratio

COPYRIGHT © 2009 by the Society of Nuclear Medicine, Inc.


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