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Rivista di Angiologia

Official Journal of the International Union of Angiology, the International Union of Phlebology and the Central European Vascular Forum
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International Angiology 2000 December;19(4):319-25


lingua: Inglese

Colour Doppler ultrasonography of the ophthalmic artery: flow parameters in normal subjects. The significance of the resistance index

Kouvidis G. K., Benos A. *, Kyriakopoulou G., Anastopoulos G., Triantafyllou D.

From the Radiology Department, 7th IKA Hospital, Athens, Greece
* Lab of Hygiene, Medical Department, Aristotle University, Thessaloniki, Greece


Background. The aim of this study was to ­assess the flow char­ac­ter­is­tics in oph­thal­mic arter­ies and to ­detect their pos­sible rela­tion­ships to those in the com­mon and inter­nal carot­id arter­ies.
Methods. Sixty ­healthy sub­jects (age range 20-74 years) with nor­mal vas­cu­lar find­ings, strat­i­fied by age and sex were recruit­ed to the study. A ­colour Doppler ultra­sound exam­ina­tion of the neck arter­ies was per­formed, fol­lowed by a ­colour Doppler ultra­sound exam­ina­tion of the 120 oph­thal­mic arter­ies includ­ed. Peak sys­tol­ic veloc­ity, end dia­stol­ic veloc­ity and resis­tance index (RI) of the com­mon carot­id, inter­nal carot­id and oph­thal­mic arter­ies, as well as the inso­na­tion depth of the oph­thal­mic arter­ies were meas­ured.
Results. The mean val­ues (stan­dard devi­a­tion) of the meas­ured param­e­ters for the oph­thal­mic arter­ies were: inso­na­tion depth: 38.38 mm (2.60 mm), peak sys­tol­ic veloc­ity: 34.71 cm/sec (6.38 cm/sec), end dia­stol­ic veloc­ity: 7.95 cm/sec (1.70 cm/sec), resis­tive index: 0.77 (0.04). The resis­tance index of the oph­thal­mic arter­ies was, in all cases, great­er than that of the ipsi­lat­er­al com­mon carot­id ­artery which in turn, was great­er than that of the inter­nal carot­id. The value of the index in the oph­thal­mic arter­ies, when the cir­cu­la­tion is nor­mal in the extra- and intra­cra­ni­al arter­ies is rare­ly lower than 0.70.
Conclusions. When an inver­sion of the ratio ­between the resis­tance index of the oph­thal­mic ­artery and that of the com­mon carot­id or an index value lower than 0.70 in the oph­thal­mic ­artery is ­observed, fur­ther inves­ti­ga­tion is need­ed as this sit­u­a­tion can­not be con­sid­ered nor­mal. The resis­tance index seems to be the most reli­able param­e­ter for the esti­ma­tion of nor­mal cir­cu­la­tion in oph­thal­mic arter­ies.

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