Vascular resistance of carotid and vertebral arteries is associated with retinal microcirculation measured by laser speckle flowgraphy in patients with type 2 diabetes mellitus

Shojiro Sawada, Satoko Tsuchiya, Shinjiro Kodama, Satoko Kurosawa, Akira Endo, Hiroto Sugawara, Shinichiro Hosaka, Yohei Kawana, Yoichiro Asai, Junpei Yamamoto, Yuichiro Munakata, Tomohito Izumi, Kei Takahashi, Keizo Kaneko, Junta Imai, Azusa Ito, Masayuki Yasuda, Hiroshi Kunikata, Toru Nakazawa, Hideki Katagiri

Research output: Contribution to journalArticlepeer-review

Abstract

Aims: Evaluation of the retinal microcirculation is key to understanding retinal vasculopathies, such as diabetic retinopathy. Laser speckle flowgraphy (LSFG) has recently enabled us to directly evaluate the vascular resistance in both retinal vessels and capillaries, non-invasively. We therefore assessed whether retinal vessel blood flow and/or the capillary microcirculation are associated with blood flow in the cervical arteries in diabetic patients without severe retinopathy. Methods: We enrolled 110 type 2 diabetes patients, with no or mild non-proliferative diabetic retinopathy, in this prospective cross-sectional study. We measured the resistivity indices (RIs) of the retinal vessel and capillaries by LSFG and those of cervical arteries by Doppler ultrasonography, followed by analyzing associations. Results: The RIs of not only the carotid but also vertebral arteries were associated with those of retinal vessel blood flow and the retinal capillary microcirculation. Multiple regression analyses revealed these associations to be independent of other explanatory variables including age and diabetes duration. Conclusions: We obtained novel and direct evidence demonstrating a close association between the retinal microcirculation and cervical artery hemodynamics in diabetic patients. These findings suggest shared mechanisms to underlie micro- and macro-angiopathies. Thus, high vascular resistance of cervical arteries may be a risk of developing retinopathy.

Original languageEnglish
Article number108240
JournalDiabetes Research and Clinical Practice
Volume165
DOIs
Publication statusPublished - 2020 Jul

Keywords

  • Laser speckle flowgraphy
  • Macroangiopathy
  • Microangiopathy
  • Resistivity index
  • Retinal microcirculation
  • Type 2 diabetes

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Endocrinology

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