[Intraocular penetration of cefotiam hydrochloride, a kind of cephalosporin after filtration surgery in rabbit eyes].
OBJECTIVE
In this study, we measured the cefotiam dihydrochloride (CTM) concentration in ocular tissue after filtration surgery in rabbit eyes.


METHODS
CTM (20 mg/kg body weight) was administered intravenously 30 min before filtration surgery which was performed by double flap procedure on the right eyes of white rabbits. The aqueous humor and serum were extracted at 10 min after surgery and at 30 min, 60 min, and 120 min. Drug concentration in all of the specimens was measured by high performance liquid chromatography (HP-LC).


RESULTS
The CTM concentrations of aqueous humor in the nonoperated eyes were 0.44 +/- 0.16(mean +/- standard deviation) microg/ml (n = 4) (40 min after intravenous dosage), 0.36 +/- 0.17microg/ml (n = 4) (60 min after intravenous dosage), 0.38 +/- 0.34, microg/ml(n = 3) (90min after intravenous dosage) and 0.27 +/- 0.10 microg/ml (n = 5) (150 min after intravenous dosage). In contrast, CTM concentration in the aqueous humor of the operated eyes was 2.4 +/- 0.95 microg/ml (n = 4) at 10 min after surgery (40 min after intravenous dosage), 2.11 +/- 1.10 microg/ml (n = 4) at 30 min after surgery (60 min after intravenous dosage), 1.18 +/- 0.78 microg/ml (n = 4) at 60 min after surgery (90 min after intravenous dosage) and 0.47 +/- 0.1 microg/ml (n = 5) at 120 min after surgery (150 min after intravenous dosage). The intraocular penetration of CTM at 10 min and at 120 min after filtration surgery was significantly higher in comparison with the drug concentration in the nonoperated eyes (p < 0.05).


CONCLUSIONS
The intraocular penetration of CTM after filtration surgery was much higher in comparison with the drug concentration in the nonoperated eyes. These results may be useful to predict the intraocular penetration of CTM in human eyes after filtration surgery.
Fukuda
Masamichi
M
Department of Ophthalmology, Kanazawa Medical University. 1-1 Daigaku, Uchinada-machi, Kahoku-gun, Ishikawa 920-0293, Japan.
Takahashi
Nobuo
N
Nakaizumi
Hiroko
H
Yamashiro
Yoko
Y
Yamaguchi
Ai
A
D000818:Animals; D000900:Anti-Bacterial Agents / Q000493:pharmacokinetics*; D001082:Aqueous Humor / Q000378:metabolism*; D015310:Cefotiam / Q000493:pharmacokinetics*; D002851:Chromatography, High Pressure Liquid; D005123:Eye / Q000378:metabolism*; D018463:Filtering Surgery; D007275:Injections, Intravenous; D011817:Rabbits
D000900:Anti-Bacterial Agents; D015310:Cefotiam