effect of insertion and removal of laryngeal mask on intra-ocular pressure in patients with cataract or glaucoma in comparison with tracheal tube

ABSTRACT

The effect of placement and removal of laryngeal mask airway [LMA] and tracheal tube [TT] on the intraocular pressure [IOP] in 30 patients with cataract [groups I and II] and 24 patients with glaucoma [groups III and IV] was compared. The induction of anesthesia decreased the IOP and ABP and increased the heart rate [HR] significantly. The insertion and removal of TT significantly increased the IOP, ABP [arterial blood pressure] and HR, while insertion and removal of LMA increased the IOP significantly only in patients with glaucoma. The changes of IOP, ABP and HR with insertion and removal of TT in groups II and IV were significant when compared to that of LMA in groups I and III. The changes of IOP with insertion or removal of TT in patients with glaucoma were significant when compared to that in cataract patients. The percentage of patients' cough within one minute after removal of TT in groups II and IV was significantly higher than LMA in groups I and III. The glaucomatous eyes showed higher changes in IOP than normal eyes after placement or removal of TT