Effects of sub-Tenon's anaesthesia on ocular hemodynamics.
OBJECTIVE
To research the effects of sub-Tenon's anaesthesia (STA) on ocular hemodynamics in patients with cataract using colour Doppler imaging (CDI).


METHODS
Prospective clinical study.


METHODS
Thirty-four eyes of 34 patients with age-related cataract.


METHODS
Peak systolic velocity (PSV), end-diastolic velocity (EDV), and resistive index (RI) values of the ophthalmic artery (OA), central retinal artery, and central retinal vein were measured by CDI before and immediately after performing sub-Tenon block using 2 mL of 2% lidocaine with adrenaline (1:200 000).


RESULTS
Both PSV and EDV values were significantly decreased after sub-Tenon injection in all the studied vessels of the patients. However, no important changes were observed in the RI values of the vessels.


CONCLUSIONS
STA markedly reduced ocular blood flow. The reduction may be more acceptable compared with other retrobulbar block methods. Sub-Tenon block should be performed carefully to senile patients with cataract with vascular occlusive disorder.
Department of Ophthalmology, Medical Faculty, Mustafa Kemal University, Hatay. Electronic address: drmesutcoskun@hotmail.com.
Mesut
M
Coşkun
Department of Ophthalmology, Medical Faculty, Mustafa Kemal University, Hatay.
Mutlu Cihan
MC
Dağlioğlu
Department of Radiology, Medical Faculty, Mustafa Kemal University, Hatay.
Ramazan
R
Davran
Department of Ophthalmology, Medical Faculty, Mustafa Kemal University, Hatay.
Nilüfer
N
Ilhan
Department of Ophthalmology, Medical Faculty, Mustafa Kemal University, Hatay.
Ozgür
O
Ilhan
Department of Ophthalmology, Medical Faculty, Mustafa Kemal University, Hatay.
Esra
E
Ayhan Tuzcu
Department of Ophthalmology, Medical Faculty, Bezmialem Vakıf University, Istanbul, Turkey.
Emre
E
Ayintap
Department of Ophthalmology, Medical Faculty, Mustafa Kemal University, Hatay.
Uğurcan
U
Keskin
Department of Ophthalmology, Medical Faculty, Mustafa Kemal University, Hatay.
Huseyin
H
Oksüz
D000368:Aged; D000772:Anesthesia, Local / Q000379:methods*; D000779:Anesthetics, Local / Q000008:administration & dosage; D001783:Blood Flow Velocity / Q000502:physiology; D002386:Cataract / Q000503:physiopathology*; D004837:Epinephrine / Q000008:administration & dosage; D005260:Female; D006801:Humans; D008012:Lidocaine / Q000008:administration & dosage; D008297:Male; D009184:Mydriatics / Q000008:administration & dosage; D009880:Ophthalmic Artery / Q000502:physiology*; D011446:Prospective Studies; D012161:Retinal Artery / Q000502:physiology*; D012169:Retinal Vein / Q000502:physiology*; D058475:Tenon Capsule / Q000187:drug effects*; D018615:Ultrasonography, Doppler, Color
D000779:Anesthetics, Local; D009184:Mydriatics; D008012:Lidocaine; D004837:Epinephrine