| OHS | obesity hypoventilation syndrome; occipital Horn syndrome; occupational health service; ocular histo... |
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| OLIDS | open loop insulin delivery system |
| OMVC | open mitral valve commissurotomy |
| OPA | open procurement agency |
| OR | a logical binary relation that is true if any argument is true, and false otherwise; [o]estrogen rec... |
| Ramstedt operation | Longitudinal incision through the anterior wall of the pyloric canal to the level of the submucosa, to treat hypertrophic pyloric stenosis. Synonym: Fredet-Ramstedt operation, Ramstedt operation. Origin: pyloro-+ G. Mys, muscle, + tome, incision (05 Mar 2000) |
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| Manchester operation | A vaginal operation for prolapse of the uterus, consisting of cervical amputation and parametrial fixation (cardinal ligaments) anterior to the uterus. Synonym: Fothergill's operation. Origin: Manchester, England (05 Mar 2000) |
| Rastelli's operation | An operation for transposition of the great arteries plus ventricular septal defect and LV outflow obstruction; employs an intraventricular tunnel repair and a rerouting valved extracardiac conduit. For "anatomic" repair of transposition of the great arteries (ventriculoarterial discordance) with ventricular septal defect and left ventricular outflow tract obstruction; conduits are used to create left ventricular to aortic continuity and right ventricular to pulmonary artery continuity. All septal defects are obliterated as are any previously constructed palliative shunts. (05 Mar 2000) |
| Mann-Williamson operation | <surgery> An operation performed on experimental animals (dogs) in research on peptic ulcer, the duodenum with its alkaline secretions being transplanted into the ileum and the cut end of the jejunum anastomosed to the pylorus. The animals develop ulcers in the jejunum which directly receives the gastric juice. (05 Mar 2000) |
| Recamier's operation | Curettage of the uterus. (05 Mar 2000) |
| Marshall-Marchetti-Krantz operation | An operation for urinary stress incontinence, performed retropubically. (05 Mar 2000) |
| Mason operation | Surgical procedure in which the stomach is transected high on the body. The resulting proximal remnant is joined to a loop of the jejunum in an end-to-side anastomosis. This procedure is used frequently in the treatment of morbid obesity. (12 Dec 1998) |
| Caslick's operation | An operation for the correction of faulty conformation of the vulva of the mare, a frequent cause of low-grade vaginitis and infertility; consists of surgical closure of the dorsal portion of the vulva. (05 Mar 2000) |
| Matas' operation | An obsolete term for aneurysmoplasty. (05 Mar 2000) |
| Gigli's operation | Severance of the pubic bone a few centimeters lateral to the symphysis, in order to increase the capacity of a contracted pelvis sufficiently to permit the passage of a living child. Synonym: Gigli's operation, pelviotomy, pelvitomy. Origin: L. Pubis, pubic bone, + G. Tome, incision (05 Mar 2000) |
| Gilliam's operation | An operation for retroversion of the uterus by suturing round ligaments to abdominal wall fascia. (05 Mar 2000) |
| Gillies' operation | A technique for reducing fractures of the zygoma and the zygomatic arch through an incision in the temporal region above the hairline. (05 Mar 2000) |
| Gil-Vernet operation | Extension of a standard pyelotomy into the lower pole infundibulum through the avascular plane between the posterior and basilar segmental renal arteries. Synonym: Gil-Vernet operation. (05 Mar 2000) |
| Mayo's operation | An operation for the radical cure of umbilical hernia; the neck of the sac is exposed by two elliptical incisions, the gut is returned to the abdomen, the sac and adherent omentum are cut away, and the fascial edges of the opening are overlapped with mattress sutures. (05 Mar 2000) |
| McIndoe operation | Operation for the development of a neovagina using a split thickness skin graft over a vaginal mold. (05 Mar 2000) |