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Biomedical subjects

H Camacho

Publications and source records attributed to H Camacho.

5 recordsLinked to original sources
PubMed1992

Retinal detachment after refractive surgery for myopia.

Refractive surgery has been used widely in some countries for the last 20 years for the correction of myopia. Radial keratotomy and keratomileusis, the most common procedures, may concur with retinal detachment. A total of 14 eyes in 12 patients, 7 after keratomileusis and 7 after radial keratotomy, which had either asymptomatic or symptomatic retinal breaks, subclinical and clinical rhegmatogenous retinal detachments, or both, are discussed here. Five eyes were treated with either laser photocoagulation or cryopexy alone, seven eyes with a scleral buckling procedure, one eye with vitrectomy, and one eye was not operated on. At the final follow-up examination, anatomic reattachment had been achieved in 12 of 14 eyes (85.7%). Visual acuity improved in 3 eyes (21.4%), remained stable in 9 eyes (64.3%), and was worse in 2 eyes (14.3%). The scleral buckling procedures used in the repair of retinal detachment induced refractive changes by modifying axial length and corneal curvature, with recurrence of myopia and astigmatism. Myopia increased a mean of -3.00 diopters in 6 of 7 eyes (86%). Myopic astigmatism power changed a mean of -1.00 diopter in 5 eyes (71%), and the astigmatic axes shifted in 3 eyes (43%). This situation could be prevented with an early peripheral search for and treatment of peripheral retinal degenerative pathologic changes, by avoiding encircling bucklings, or by using alternative methods of treatment.

Adult↗
PubMed1992

Silicone oil in the management of giant retinal tears.

To evaluate the results of using and removing silicone oil in the management of giant retinal tears, 24 cases of vitrectomy with fluid-silicone oil exchange were reviewed. We did not use cryotherapy in any case. For chorioretinal adherence, we used either endolaser or postoperative external laser and a narrow buckle. The retina was reattached successfully in 22 (91.6%) of the 24 eyes. Of these, visual acuity was 20/200 or better in 18 (75%) eyes. This was significantly better than the preoperative visual acuity (P = .02). After removing the silicone oil in 15 cases, 13 (92.8%) had visual acuities of 20/200 or better, which was considerably better than that of the group in which the silicone oil was not removed (P = .006). We recommend removing the silicone oil and additional peeling of membranes an average of six months postoperatively when the eye is stable.

Adolescent↗
PubMed1991

Extraction of intraocular foreign bodies by pars plana vitrectomy. A retrospective study.

We reviewed the medical records of 44 patients who underwent a pars plana vitrectomy to remove posttraumatic intraocular foreign bodies. The group most affected was that of males with a mean age of 28 years, who sustained a job injury, presenting with a single corneal laceration less than 2 mm in extension. There were 31 (70.45%) metallic foreign bodies. At surgery, 27 (61.36%) of the 44 foreign bodies were removed with forceps and 17 (38.63%) with the rare-earth magnet. From these patients, 84.61% obtained a final visual acuity equal or better than that on admission. We did not find a statistically significant difference between the groups with different timing on their vitrectomy, nor between groups presenting with and without vitreous hemorrhage.

Adolescent↗
PubMed1983

Changes in simple and complex behaviors following kindled seizures in rats: opioid and nonopioid medication.

To learn more about postictal behaviors and their underlying mechanisms, five behaviors and EEG recordings were studied following fully generalized, kindled seizures in rats. The behaviors included bar pressing for food; tail withdrawal, squeak, and multiple squeak responses to painful tail shocks; consumption of freely available food; clinging to a vertical grid; and locomotion. Latencies from the end of a seizure afterdischarge until each behavior recovered were compared and were found to cluster in three distinct pairs. Locomotion and grid clinging recovered most quickly; consumption of freely available food and EEG postictal depression recovered next; and bar pressing for food and the multiple squeak response recovered most slowly. Naloxone pretreatment (10 mg/kg but not 1 mg/kg) shortened recovery to multiple squeak responses, grid clinging, and locomotion, without affecting recovery of bar pressing, food consumption, or EEG postictal depression. These results suggest that complex behaviors recover more slowly following a seizure than simple behaviors. It also appears that opioids are released by a kindled seizure and mediate certain postictal changes in motor- and pain-related behaviors.

Animals↗