Department of Ophthalmology, Korea University College of Medicine, Ansan, Republic of Korea.
Can J Ophthalmol. 2010 Dec;45(6):602-5. doi: 10.3129/i10-049.
To determine whether the alterations in intraocular pressure (IOP) after cutting off a lateral rectus muscle during exotropia surgery could reflect the degree of muscle contracture.
Prospective study.
Sixty eyes of 31 patients that had undergone lateral rectus recession surgery for correction of exotropia.
IOP was measured using a Tono-pen XL before and after detaching lateral rectus muscles during the surgery. The changes in IOP were measured and their correlations with age, duration of disease, intermittency of exotropia, amount of exodeviation, laterality of the deviated eye, and tendon width of the muscle operated on were analyzed.
The mean baseline IOP was 16.3 (SD 2.2) mm Hg when measured 5 minutes after tracheal intubation and showed a significant decline to 13.5 (SD 2.8) mm Hg when measured immediately before detachment of a muscle. However, the IOP decline over this period of preparation for muscle detachment was not correlated with any clinical variable tested. The mean IOP also showed a significant reduction, to 10.8 (SD 2.3) mm Hg, immediately after the muscles were cut off the globe. The peridetachment IOP reduction was positively correlated with constant exodeviation (p < 0.001), whereas there was no significant correlation with age, duration of exotropia, or tendon width.
The changes in IOP seen after detaching an extraocular muscle during strabismus surgery may serve as a surrogate parameter to reflect the muscle contracture.
确定在斜视手术中切断外直肌后眼内压（IOP）的变化是否能反映肌肉挛缩的程度。
前瞻性研究。
31 例接受外直肌后退术矫正外斜视的患者 60 只眼。
在手术中分离外直肌前后，使用 Tono-pen XL 测量 IOP。测量 IOP 的变化，并分析其与年龄、疾病持续时间、外斜视间歇性、外偏距、偏斜眼的偏侧性和手术肌肉的肌腱宽度的相关性。
气管插管后 5 分钟测量的基础眼压（IOP）平均值为 16.3（SD 2.2）mmHg，在分离肌肉前立即测量时显著下降至 13.5（SD 2.8）mmHg。然而，在此期间准备分离肌肉时，IOP 的下降与任何测试的临床变量均无相关性。在切断眼球上的肌肉后，平均 IOP 也显著降低，降至 10.8（SD 2.3）mmHg。分离前的 IOP 降低与恒定性外斜视呈正相关（p < 0.001），而与年龄、外斜视持续时间或肌腱宽度无显著相关性。
斜视手术中分离眼外肌后 IOP 的变化可以作为反映肌肉挛缩的替代参数。
