| ISI | infarct size index; initial slope index; injury severity index; Institute for Scientific Information... |
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| ISMED | International Society on Metabolic Eye Disorders ISMH International Society of Medical Hydrology |
| ISN | integrated service network; International Society of Nephrology; International Society of Neurochemi... |
| mIU | milli-international unit; one-thousandth of an international unit |
| SI | International System of Units [Fr. le Systeme International d'Unites]; sacroiliac; saline infusion; ... |
| filtering surgery | A surgical procedure used in treatment of glaucoma in which an opening is created through which aqueous fluid may pass from the anterior chamber into a sac created beneath the conjunctiva, thus lowering the pressure within the eye. (hoffman, pocket glossary of ophthalmologic terminology, 1989) (12 Dec 1998) |
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| laparoscopically assisted surgery | Operative procedure performed using combined laparoscopic and open techniques; most commonly applied to colon or small intestinal resections with anastomosis. (05 Mar 2000) |
| laparoscopic surgery | Operative procedure performed using minimally invasive surgical technique for exposure that avoids traditional incision. Visualization is achieved using a fibre optic instrument, usually attached to a video camera. (05 Mar 2000) |
| laser surgery | A type of operation using the cutting powers of laser beams from various sources. The use of a laser either to vaporise surface lesions or to make bloodless cuts in tissue. It does not include the coagulation of tissue by laser (laser coagulation). (12 Dec 1998) |