%0 Journal Article %1 Nagel.2005 %A Nagel, E. %A Vilser, W. %A Lanzl, I. M. %D 2005 %J Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft %K Adult;Aged;Anatomy, Aged;Photic Artery/anatomy Computer-Assisted/methods;Light;Male;Middle Cross-Sectional/*methods;Female;Humans;Image Interpretation, Stimulation/*methods;Retinal Vein/anatomy WViCo effects effects;Retinal effects;Vasodilation/*physiology/radiation histology/*physiology/radiation {\&} %N 8 %P 787--793 %R 10.1007/s00347-005-1191-9 %T Vergleich der Durchmesserreaktion retinaler Arterien und Venen auf Flickerlicht: Comparison of diameter response of retinal arteries and veins to flickering light. A clinical study with healthy people %V 102 %X PURPOSE: The aim of this study was to compare the diameter response of retinal arteries and veins after provocation with flickering light regarding the amplitude and temporal course. METHODS: The study included 26 healthy volunteers. The vessel diameter was automatically and continuously measured by the retinal vessel analyzer. The examination consisted of a baseline measurement (100 s) followed by five periods of 20-s flicker light provocation and 80-s follow-up observation. RESULTS: A diameter dilation was observed immediately after the end of the flicker period in arteries (6.9+/-2.8\%) and veins (6.5+/-2.8\%, difference n.s.). The quotient of arterial and venous dilation (AVDQ) was 1.25+/-0.69 (range: 0.2-2.8). A significant correlation of age and arterial or venous dilation or the AVDQ was not observed. The arterial diameter reduced faster than the venous and reached a minimum of -2.7+/-1.4\% at 25.9+/-10.8 s after the end of the flicker phase. The veins were dilated by 0.5+/-1.3\% at the time of the maximal individual arterial constriction (p<0.0001). CONCLUSIONS: Flicker-evoked response of retinal arteries and veins did not differ in the dilative amplitude but in the temporal course of the abatement of the dilation.

@article{Nagel.2005, abstract = {PURPOSE: The aim of this study was to compare the diameter response of retinal arteries and veins after provocation with flickering light regarding the amplitude and temporal course. METHODS: The study included 26 healthy volunteers. The vessel diameter was automatically and continuously measured by the retinal vessel analyzer. The examination consisted of a baseline measurement (100 s) followed by five periods of 20-s flicker light provocation and 80-s follow-up observation. RESULTS: A diameter dilation was observed immediately after the end of the flicker period in arteries (6.9+/-2.8{\%}) and veins (6.5+/-2.8{\%}, difference n.s.). The quotient of arterial and venous dilation (AVDQ) was 1.25+/-0.69 (range: 0.2-2.8). A significant correlation of age and arterial or venous dilation or the AVDQ was not observed. The arterial diameter reduced faster than the venous and reached a minimum of -2.7+/-1.4{\%} at 25.9+/-10.8 s after the end of the flicker phase. The veins were dilated by 0.5+/-1.3{\%} at the time of the maximal individual arterial constriction (p<0.0001). CONCLUSIONS: Flicker-evoked response of retinal arteries and veins did not differ in the dilative amplitude but in the temporal course of the abatement of the dilation.}, added-at = {2013-10-10T21:29:09.000+0200}, author = {Nagel, E. and Vilser, W. and Lanzl, I. M.}, biburl = {https://www.bibsonomy.org/bibtex/2f770e270ddc84f24e6b2734487a0233d/imedos}, doi = {10.1007/s00347-005-1191-9}, interhash = {1ae374b470d614033fd728f1bcc55dd4}, intrahash = {f770e270ddc84f24e6b2734487a0233d}, issn = {0941-293X}, journal = {Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft}, keywords = {Adult;Aged;Anatomy, Aged;Photic Artery/anatomy Computer-Assisted/methods;Light;Male;Middle Cross-Sectional/*methods;Female;Humans;Image Interpretation, Stimulation/*methods;Retinal Vein/anatomy WViCo effects effects;Retinal effects;Vasodilation/*physiology/radiation histology/*physiology/radiation {\&}}, number = 8, pages = {787--793}, timestamp = {2013-10-11T01:11:02.000+0200}, title = {Vergleich der Durchmesserreaktion retinaler Arterien und Venen auf Flickerlicht: [Comparison of diameter response of retinal arteries and veins to flickering light. A clinical study with healthy people]}, volume = 102, year = 2005 }