Wetzel W
University Hospital, Clinic for Ophthalmology, Kiel, Germany.
Ophthalmic Surg. 1994 May;25(5):298-302.
Iridotomy and capsulotomy using the Q-switched Nd:YAG laser affect ocular aqueous humor dynamics, causing intraocular pressure (IOP) temporarily to rise following these procedures. We measured aqueous outflow facility and aqueous secretion flow by oculopression tonometry in 20 eyes before and after YAG laser iridotomy, and in 19 eyes before and after YAG laser posterior capsulotomy. IOP increased after both laser procedures. Our measurements showed that this elevation must have been caused by a reduction in outflow facility, since aqueous secretion flow actually decreased. In the iridotomy patients, the preoperative outflow facility (in most of the cases, already compromised preoperatively by glaucoma), was directly related to the maximum postoperative IOP elevation. In the capsulotomy patients, postoperative outflow facility was correlated with the total laser energy used. No such correlation was observed in the iridotomy patients. Additionally, in the capsulotomy patients, the type of secondary cataract (ie, proliferative or fibrotic) may have influenced the level of reduction of outflow facility.
使用调Q开关Nd:YAG激光进行虹膜切开术和晶状体后囊切开术会影响眼房水动力学，导致这些手术后眼压（IOP）暂时升高。我们通过压平眼压测量法在20只眼睛进行YAG激光虹膜切开术前后以及19只眼睛进行YAG激光晶状体后囊切开术前后测量了房水流出易度和房水分泌流量。两种激光手术后眼压均升高。我们的测量结果表明，这种升高一定是由流出易度降低引起的，因为房水分泌流量实际上减少了。在虹膜切开术患者中，术前流出易度（在大多数情况下，术前已因青光眼而受损）与术后最大眼压升高直接相关。在晶状体后囊切开术患者中，术后流出易度与所用的总激光能量相关。在虹膜切开术患者中未观察到这种相关性。此外，在晶状体后囊切开术患者中，继发性白内障的类型（即增殖性或纤维化性）可能影响了流出易度降低的程度。
