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Vessel diameter changes during the cardiac cycle

H C Chen1, V Patel, J Wiek

  • 1Diabetic Retinopathy Unit, Royal Postgraduate Medical School, Hammersmith Hospital, London, UK.

Eye (London, England)
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

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Retinal vessel diameter changes with the cardiac cycle, impacting blood flow measurements. Synchronizing fundus photography with electrocardiograms is crucial for accurate retinal blood flow assessment.

Area of Science:

  • Ophthalmology
  • Physiology
  • Medical Imaging

Background:

  • Retinal vessel diameter is key for measuring blood flow.
  • Cardiac pulsation and vasomotion influence these diameters.
  • Accurate retinal blood flow assessment is vital for diagnosing various conditions.

Purpose of the Study:

  • To investigate the dynamic changes in retinal vessel diameter during the cardiac cycle.
  • To quantify the impact of pulsation and vasomotion on retinal blood flow.
  • To establish optimal timing for fundus photography for accurate measurements.

Main Methods:

  • Analysis of three monochromatic fundus photographs.
  • Images captured at eight points within the cardiac cycle.
  • Study conducted on 10 healthy subjects.

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Main Results:

  • Venous diameter decreased in early systole, peaked in early diastole (4.82% change, p=0.03), affecting volumetric flow by 9.83%.
  • Arterial diameter peaked in mid-late systole (3.46% change, p=0.01), increasing flow by 7.04%.
  • Vasomotion caused 3.71% arterial and 2.61% venous diameter changes.

Conclusions:

  • Retinal vessel diameter exhibits significant, measurable changes throughout the cardiac cycle.
  • These dynamic changes directly influence volumetric blood flow calculations.
  • Synchronizing fundus photography with electrocardiography is essential for precise retinal blood flow quantification.