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Biomedical subjects

Marc Muraine

Publications and source records attributed to Marc Muraine.

7 recordsLinked to original sources
PubMed2006

Impact of new lamellar techniques of keratoplasty on eye bank activity.

BACKGROUND: Deep anterior lamellar keratoplasty (DALK) has become an increasingly popular alternative to penetrating keratoplasty in patients with stromal corneal pathologies. The main advantages of DALK are: prevention of long-term endothelial loss, elimination of allograft reaction and short topical steroid treatment with lower risks of glaucoma, cataract and infection. Because this technique enables surgeons to use corneal grafts with low endothelial density, the aim of this paper was to determine whether this type of innovation has had a significant impact on eye bank activity. METHODS: We reviewed our corneal graft activity over a 40-month period and assessed the proportion of deep lamellar and penetrating keratoplasties. During the same period, we also evaluated our eye bank activity and recorded the utilisation of grafts with endothelium abnormalities, which were only suitable for lamellar techniques. RESULTS: Deep lamellar keratoplasty represented 29.8% (85 out of 285) of corneal transplantations. Forty-eight percent of all corneas stored at the local eye bank were unsuitable for penetrating keratoplasty; 36.6% of those were not suitable for endothelial deficiencies. Among these, 72.7% were used for DALK and 27.3% were rejected. This permitted a 24.5% increase in corneal grafting activity. In contrast, Descemet's membrane was removed at the time of surgery in 12% of corneas with healthy endothelium, which was used for deep lamellar keratoplasty. CONCLUSIONS: Deep anterior lamellar keratoplasty development and close collaboration between eye banks and surgeons can induce a significant increase in corneal grafting. This could be a partial solution in countries confronted with corneal graft shortages.

Cornea↗
PubMed2006

Evaluation of macular changes before and after successful retinal detachment surgery using stratus-optical coherence tomography.

PURPOSE: To assess preoperative and postoperative infra-clinical macular changes in macula-off retinal detachment (RD) using third-generation optical coherence tomography (OCT3). DESIGN: Prospective observational cohort study. METHODS: Twenty-two nonconsecutive eyes of 22 patients with macula-off RD underwent best-corrected visual acuity measurement and OCT3 scans through the fovea before and after successful surgery. The relationship between preoperative and postoperative OCT macular characteristics, postoperative infra-clinical foveal detachment, and final visual acuity (FVA) were assessed using Kruskal-Wallis multiple comparison test and Mann-Whitney U test, respectively. RESULTS: Preoperative cystic cavities in the inner nuclear layer of the detached retina, postoperative abnormal macular profile, and postoperative lack of the junction line between photoreceptor cell inner and outer segments on OCT3 were associated with a poorer FVA (P = .001, P = 10(-4) and P = .015, respectively). In contrast, postoperative infra-clinical foveal detachment did not influence FVA (P = .88). CONCLUSIONS: Morphologic macular analysis using OCT3 provide some new insights to understand incomplete visual recovery after successful macula-off RD surgery.

Adult↗
PubMed2006

A keratitis rat model for evaluation of anti-Acanthamoeba polyphaga agents.

PURPOSE: To develop a rat model of chronic Acanthamoeba polyphaga keratitis suitable for pharmacologic assessment of therapeutic agents. METHODS: An A. polyphaga isolate (ATCC #50495) was grown in peptone-yeast extract-glucose medium. Five-weeks-old, Sprague-Dawley male rats were injected with 10(3) or 10(4) trophozoites in the left cornea stromal layer. A subconjunctival injection of 0.14, 0.28, or 0.57 mg long-acting betamethasone was performed weekly. At the end of experiments, rats were killed; the superficial corneal epithelium gently scraped and cultured; and globes histologically examined. Topical polyhexamethylene biguanide (PHMB), hexamidine diisethionate, and miltefosine (hexadecylphosphocholine) were administered topically as eye drops 3 times a day at concentrations of 0.02%, 0.1%, and 0.01% respectively. In vitro minimal inhibitory concentration (MIC) and fractional inhibitory concentration values were measured in A. polyphaga cultures. RESULTS: In infected eyes, lesions consisted of the sequential appearance within 2 weeks of edema, infiltrates, and/or abscesses. On day 35 postinfection, a combination of 10(4) parasites with a regimen of 0.28 mg/week betamethasone resulted in the highest ratio of rats with abscesses. Presence of A. polyphaga was confirmed histologically and inconsistently in cultures. In rats optimally prepared as said earlier, agents were administered on day 6 postinfection. A combination of PHMB and hexamidine diisethionate exerted a synergistic effect and was more effective than PHMB, hexamidine diisethionate, or miltefosine alone. In vitro, PHMB (MIC = 14.6 microM) and hexamidine diisethionate (MIC = 555 microM) exerted a synergistic effect (fractional inhibitory concentration = 0.06), and miltefosine exhibited antiamoebal activity (MIC = 27.4 microM). CONCLUSIONS: In this study, a rat model of chronic A. polyphaga keratitis was obtained and found suitable for assessment of pharmacologic agents. It provides an in vivo approach of drug resistance, pathogenicity, and physiopathologic mechanisms of chronic amoebic keratitis.

Acanthamoeba↗
PubMed2005

Predictive visual outcome after macula-off retinal detachment surgery using optical coherence tomography.

PURPOSE: To determine whether preoperative optical coherence tomography (OCT) is useful in predicting postoperative visual outcome for patients with primary macula-off rhegmatogenous retinal detachment (RD). METHODS: This prospective study included 20 nonconsecutive eyes with macula-off RD and successful reattachment of the retina. Preoperative 5-mm OCT was performed through the center of the fovea. The relationship among preoperative OCT findings, main preoperative clinical variables, and final postoperative visual acuity was statistically analyzed. RESULTS: Final postoperative visual acuity was negatively correlated with three preoperative OCT variables: height of RD at the central fovea (r=0.79; P <0.001), distance from the central fovea to the nearest undetached retina (r=0.75; P <0.00051), and, to a lesser degree, extent of structural changes in the detached retina (r=0.48; P=0.03). Preoperative visual acuity was the only clinical variable statistically correlated with final postoperative visual acuity in this study (r=0.55; P=0.01). Using multivariate logistic regression analyses, the structure of the detached retina combined with the distance from the central fovea to the nearest undetached retina, as determined with OCT, was highly correlated with final postoperative visual acuity (r=0.82; P <0.000051). CONCLUSION: Preoperative macular analysis with OCT may help to predict visual outcome for patients with macula-off RD.

Adult↗
PubMed2004

Sub-Tenon infiltration or classical analgesic drugs to relieve postoperative pain.

BACKGROUND: In a prospective randomized double-blind study, the analgesic effect produced by sub-Tenon infiltration was compared with classic analgesic drugs in patients scheduled for posterior segment surgery under general anaesthesia. METHODS: One hundred patients were randomized into two groups of 50. One group received sub-Tenon infiltration (group 1) with 3 mL of bupivacaine 0.50% by the surgeon before the end of the surgery and the other (group 2) received only classical analgesic drugs postoperatively. A visual analogue scale (VAS) (graded from 1 to 10) was used to assess pain. For both groups, when VAS was between 1 and 3 paracetamol (3 g/24 h) associated with ketoprofen (200 mg/24 h) was given; between 3 and 6 nalbuphine (0.2 mg/kg slowly intravenously repeated every 4 h if necessary) was given; and over 6 morphine was given. Morphine 1 mg was injected every 2 min until VAS below 3 was obtained. RESULTS: All patients in group 2 (control) experienced pain in the recovery room period; however, no patient in group 1 required analgesic drugs in the first 6 h after the sub-Tenon infiltration. In the recovery room period, the VAS pain score in patients who received sub-Tenon infiltration (group 1) was 0.6 +/- 1.3 (mean +/- SD) compared to 3.4 +/- 2.2 in group 2. The difference was statistically significant (P = 0.000001). All patients in group 2 asked for analgesic drugs in the recovery room, some of whom required morphine. Despite the administration of drugs the pain score was statistically higher in group 2. Between the end of the recovery room period and the 6th hour, the VAS pain score in group 1 was statistically lower. From the 6th until the 24th hour, the pain score was not statistically significantly different between the groups. Regarding consumption of analgesic drugs from the recovery room until the 24th hour, the consumption of level 1 analgesic drugs (paracetamol, ketoprofen) and level 3 (morphine) was statistically lower in group 1 (P = 0.0009). The difference was not significant for level 2, probably because the number of patients was not sufficient. CONCLUSION: Sub-Tenon infiltration with 3 mL of bupivacaine 0.50% offers excellent postoperative analgesia for about 6 h and is an excellent alternative to classical drugs. Furthermore, it is highly reliable and safe.

Adult↗
PubMed2003

Long-term results of penetrating keratoplasty. A 10-year-plus retrospective study.

BACKGROUND: The aim of this study was to retrospectively analyse the outcome of a series of grafted patients over a period of more than 10 years and to determine their long-term survival probability. METHODS: The records of 89 patients who had 103 grafts performed in 97 eyes were analysed. Mean follow-up was 12.8 years (range 10-17 years). Life table analysis (Kaplan-Meier) was used to evaluate the graft survival of the total population and of different groups. RESULTS: Eighteen out of 89 patients (20.2%) had died. At the last visit before their death, 10 of the 21 grafts in those patients were still clear. Graft survival rates after 1, 2, 5 and 10 years were 79%, 73%, 59% and 50%; the rate at the end of follow-up was 47%. Survival rate at the end of the study was 94.7% for keratoconus, 57.1% herpes keratitis, 33.3% for pseudophakic keratopathies, 28.5% for post-traumatic keratopathies and 11.1% for re-grafts. In the group of patients grafted for aphakic or pseudophakic keratopathy, 40% died during the study. In 45% of cases their grafts were clear at the time of death. Endothelial decompensation and definitive graft rejection were the main causes of failure. CONCLUSIONS: The outcome of keratoplasty is progressively getting worse with time in pseudophakic or traumatic keratopathies whereas survival rates are still stable from 10 to 17 years in grafts performed after keratoconus or herpetic keratitis.

Adolescent↗