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Biomedical subjects

D L McCartney

Publications and source records attributed to D L McCartney.

11 recordsLinked to original sources
PubMed1990

Dual camera sequencer for microsurgical documentation.

All currently available documentary formats have inherent compromises. The use of both video and 35-mm still photography seems to be a practical solution but introduces image quality loss (when using a beam splitter type of dual camera adapter) or increased complexity of operation and resultant surgeon distraction (when using a movable mirror type of dual camera adapter). An electronic sequencer was designed to simplify the operation of a movable mirror type of dual camera adapter, permitting the efficient production of high image quality video recordings and 35-mm slides.

Equipment Design↗
PubMed1989

Managing posterior pressure during pseudophakic keratoplasty.

Positive vitreous pressure during penetrating keratoplasty can be difficult to manage. Despite preventive measures, positive vitreous pressure may occur and appropriate intervention is necessary to prevent serious complications. We describe a technique that may be used intraoperatively to restore a formed anterior segment and to prevent vitreous loss when persistent positive vitreous pressure occurs, while attempting to implant a pseudophakos. A 27-gauge needle, passed across the anterior chamber from limbus to limbus, just anterior to the iris, will stabilize the pseudophakos, restore the anterior chamber depth, and allow donor-tissue suturing.

Cataract Extraction↗
PubMed1988

The efficacy and safety of combined trabeculectomy, cataract extraction, and intraocular lens implantation.

The safety and efficacy of combined trabeculectomy, extracapsular cataract extraction (ECCE), and posterior chamber intraocular lens (PC IOL) implantation were evaluated by retrospectively analyzing 108 consecutive operations. Postoperatively, 89% of eyes achieved 20/40 or better visual acuity when preoperative macular and optic nerve diseases were excluded. Mean follow-up was 16.8 months. Intraocular pressure (IOP) control (less than or equal to 21 mmHg) was achieved in 92% of eyes; 57% required no medications. Capsulotomy (20%) and transient hyphema (15%) occurred significantly more often (P less than 0.001) than in a comparison group. These results suggest that the combined procedure gives excellent visual rehabilitation and IOP control in the majority of patients included in this analysis.

Aged↗
PubMed1987

Refractive keratoplasty for disabling astigmatism after penetrating keratoplasty.

Postoperative astigmatism is one of the major limitations of penetrating keratoplasty. In an attempt to reduce postkeratoplasty astigmatism, we combined corneal-relaxing incisions with orthogonal compression sutures, guided by the intraoperative use of a ring keratometer. Eleven consecutive patients from a mixed referral population with functionally disabling astigmatism were studied. The average preoperative keratometric cylinder of 11.68 diopters was reduced by 7.95 (+/- 3.03 SD) diopters. Each patient's net keratometric cylinder was reduced. We believe that this technique is safer and more predictable than previously published techniques.

Astigmatism↗