Comparison of Descemet stripping under continuous air flow, manual air injection and balanced salt solution for DMEK: a pilot study.

BACKGROUND: Descemet's membrane endothelial keratoplasty (DMEK) involves removal of the recipient's Descemet membrane (DM) prior to transplanting the donor's DM. When using balanced salt solution (BSS) or ophthalmic viscosurgical devices (OVDs), visualization of the host's DM during its stripping may be inadequate and may result in Descemet remnants and could lead to sub-optimal surgical results. Previous articles described excellent visualization when utilizing air injection but this requires repeated air injection into the anterior chamber (AC). We present a pilot study that compares different techniques under which DM stripping can be performed: with continuous automated air infusion, with manual air infusion, and with BSS. METHODS: We retrospectively compared video footage of DM stripping with BSS, with continuous air and with manual injection of air into the AC to determine DM stripping duration and the number of times the surgeon had to insert and retrieve a surgical instrument from the AC. RESULTS: Thirty videos of 10 consecutive cases of the three DM stripping techniques were evaluated. DM stripping duration was 3.26 (±1.32), 3.92 (±1.2) and 12.9 (±3.98) minutes for BSS, continuous air flow, and manual air injection, respectively. Frequency of instrument retrieval (FIR) was 3.6 (±1.71), 1.5 (±0.71) and 15.1 (±3.28) for BSS, continuous air flow, and manual air injection, respectively. Continuous air flow and BSS were both statistically different than manual air injection into the AC (p < 0.05), but did not differ from one another statistically. CONCLUSION: DM stripping during posterior lamellar surgery is imperative for favorable post-operative results and prevention of complications. Performing this step under air in the AC contributes to better visualization and an efficient surgery.

The Human Genome Project: ethical and social implications.

This article explores some of the potential moral and social ramifications of the Human Genome Project. Research on the human genome is generating important ethical and social questions of at least three distinct kinds. First, what genetic information should be generated, and who should control its dissemination and use? Improved diagnostic techniques such as presymptomatic testing, carrier screening, and prenatal screening can provide information that poses significant ethical problems for individuals, employers and insurance companies, and the medical and counseling professions. Second, what genetic procedures should be employed? The burgeoning ability to manipulate human genotypes and phenotypes through procedures such as gene therapy and enzyme therapy are leading to difficult questions about which manipulations should be permitted and which should be prohibited. Third, how will this new information change lives? Increasing claims about the relationship of genetics to ethically and politically significant traits and behaviors are challenging human self-understanding and the capacity of social institutions to respond adequately.