During Eye surgery, surgeons sometimes use an infusion cannula to maintainthe in

Question

During Eye surgery, surgeons sometimes use an infusion cannula to maintainthe intraocular pressure at the desired level. The infusion canula must be able to provide adequate volume flow rate to maintain the pressure while fluid is removed from they due to aspiration or leakage. The supply bottle for the infusion fluid is held at some height above the eye to maintain the pressure in the eye at the desired level. You can assume the pressure of the fluid in the bottle is 1 atm. If you want to maintain the eye pressure at approximately 18 mmHg. Normally, you use 25 gauge infusion canula with the bottle held 0.25 meters above the level of the eye to maintain this pressure in the eye when there is no flow in the infusion canula. Verify that the pressure in the eye is at about 18 mmHg gauge pressure. The surgeon introduces a small hole in the eye and the fluid inside starts to come out at 0.24 mL/min. What will be the new pressure in the eye if the flow in the infusion canula increases from 0 mL/min to the 0.24 mL/min maintaining the fluid loss. What rate of fluid loss could be maintained with this bottle height without dropping the pressure below 15 mmHg (gauge)?

Explanation / Answer

since the fluid coming out of the eye at0.24 mL/min. and immediately the flow in the infusion canula increases up to the 0.24 mL/min, there should be no changes inside the eye.

Firstly the pressure will decrease but soon it will be recovered by the external fluid and will maintained up to the 18 mmHg pressure.

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