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Biomedical subjects

M H Duong

Publications and source records attributed to M H Duong.

9 recordsLinked to original sources
PubMed2002

[Corneal asphericity in myopes].

PURPOSE: To study the variations of corneal asphericity in a population of myopic patients. METHODS: One hundred consecutive myopic patients were included in this study. The EyeSys videokeratoscope was used to assess the corneal topography of these patients seeking refractive surgery. We compared the results of cycloplegic refractions with the values of the corneal asphericity and mean central keratometry. RESULTS: Mean corneal asphericity was -0.09. Eighty per cent of the myopic patients had a prolate corneal contour, whereas 20% had an oblate corneal contour. No significant relationship was found between the corneal asphericity value and the mean keratometry value or the mean refractive error. CONCLUSION: The mean corneal asphericity in our myopic population was -0.09. This is slightly more than previously reported data in similar studies. No statistically significant relationship was found between corneal asphericity, mean refractive error, and mean keratometry.

Adult↗
PubMed2002

[Laser epithelial keratomileusis for the treatment of low to moderate myopia: preliminary results].

PURPOSE: To analyze the refractive outcome and the postoperative pain and corneal haze following laser epithelial keratomileusis (LASEK) for the treatment of low to moderate myopia. METHODS: A monocentric prospective noncomparative study was started in June 2000, after informed consent was obtained from patients with a spherical equivalent of less than -5 diopters (D). This study actually was part of another prospective comparative study where the contralateral eye underwent photorefractive keratectomy. An epithelial debridement was performed using diluted ethanol, the epithelial flap was lifted, photoablation was performed, the flap was put back in place, and secured by a bandage contact lens. The refractive outcome was assessed, and postoperative pain and haze were graded using an analogical visual scale from 0 to 10 and a scale of 0 to 4, respectively. RESULTS: We included 17 eyes of 16 patients. LASEK was performed successfully in 15 eyes (88.2%). One of these eyes could not be assessed for the refractive outcome and postoperative haze because the epithelial flap was torn during contact lens removal. The mean postoperative pain level during the night following the procedure was 5.7+/-2.0. The mean preoperative spherical equivalent (SE) was -2.5+/-1.0 D, and after a 2-month follow-up, the mean postoperative SE was +0.26+/-0.6 D. Twelve eyes (85.7%) and 10 eyes (71.4%) were within +/-1.0 D and +/-0.5 D from the attempted correction, respectively. The corneal haze grade was less than 1 in 12 eyes (85.7%) and equal to 1 in two eyes (14.3%). No complications and no loss of postoperative best-corrected visual acuity were noted. CONCLUSIONS: LASEK appears to be a reliable and reproducible technique for the treatment of myopia-associated SE of less than -5 D. Postoperative pain is moderate and flap-related complications of LASIK are avoided.

Adult↗
PubMed2002

[Bilateral retinitis: early manifestation of subacute sclerosing panencephalitis. A case report].

Subacute sclerosing panencephalitis (SSPE) is a progressive encephalitis caused by persistent measles infection. The disease is almost always fatal and mainly affects children and young adults. Ophthalmological signs are frequently observed and can be the presenting manifestations. We report the case of a 22-year-old young man who presented with bilateral posterior retinal necrosis confirmed by fluorescein angiography and normal laboratory tests. The appearance of peripheral retinal tears and stereotyped myoclonic movements were signs of the evolving condition. Diagnosis of SSPE was confirmed by brain MRI, EEG, and cerebrospinal fluid examination. The patient's neurological condition deteriorated rapidly and he died 2 months following the onset of ophthalmological manifestations.

Adult↗
PubMed2001

An unusual complication during central venous catheter placement.

A 31-year-old man with disseminated Coccidioides imitis infection required central catheter placement for access. The patient had an inferior vena cava (IVC) filter placed as a result of previous deep venous thrombosis of the left lower extremity. The guidewire could not be removed following placement of the right internal jugular catheter by the Seldinger technique. Fluoroscopic examination revealed entanglement of the J-tip guidewire in the apex of the IVC filter. The catheter was successfully removed by interventional radiologists using a snare tip catheter through the left femoral vein.

Adult↗
PubMed2001

[Enucleation with on-the-table evisceration. Is it a good technique?].

PURPOSE: To evaluate the surgical technique of enucleation followed by an "on-the-table evisceration" and placement of a hydroxyapatite orbital implant wrapped by the patient's own sclera for the treatment of blind phthisis painful eyes. PATIENTS AND METHODS: In this single-center retrospective study, 50 consecutive patients undergoing an operation using the same surgical technique, between April 1993 and November 1999, were studied. Patients underwent enucleation, then the eyeball was eviscerated "on the table". The patient's own cleaned sclera was used to wrap a hydroxyapatite orbital implant, the posterior pole of the sclera was placed at the anterior pole of the implant. Conjunctival breakdown, sphere size, conjunctival discharge, the first signs of sympathetic ophthalmia motility, and cosmetic results were analysed. RESULTS: After an average follow-up of 13.3 months few complications were encountered: 4 cases (8%) of inclusion cyst and 3 cases (6%) of discharge. The implant placed had a diameter of 18 mm, 20 mm, 22 mm in, respectively, 48%, 48%, and 4% of the eyes. The prosthesis motility was good, medium, and poor in, respectively, 33 (78.6%) cases, 8 (19%) cases, and 1 (2.4%) case. The prosthesis tolerance was good, medium, and poor in respectively 86%, 10%, and 4% of the cases. CONCLUSION: The surgical technique of enucleation followed by an "on-the-table" evisceration and autologous sclera wrapping a hydroxyapatite implant is an easy procedure. It allows, on phthisis eyeballs, the placement of a large orbital implant for good cosmesis results, without major complications.

Adolescent↗
PubMed2001

[Lamellar keratoplasty with air or viscoelastic substance injection].

PURPOSE: To analyze the results of very deep lamellar keratoplasty using dissection with air and a viscoelastic substance. METHODS: This was a prospective monocentric noncomparative study. Candidates for lamellar keratoplasty were enrolled between November 1998 and July 2000. Deep lamellar dissection was performed following air injection into the cornea to create a white emphysema of the stroma. The dissection was performed to the Descemet membrane. Whenever a large bulla was present in the recipient bed, the dissection of the deepest stromal lamellae was performed by injecting a viscoelastic substance into the bulla. A full-thickness allogenic corneal button was sutured to the recipient bed. RESULTS: Fifteen eyes of 14 patients (mean age, 39.3 years) underwent deep lamellar keratoplasty: keratoconus (11 eyes), atopic keratoconjunctivitis (1 eye), herpes zoster keratitis (1 eye), corneal scar after pterygium surgery (1 eye), and rosacea keratitis (1 eye). Excluded from the analysis of the refractive outcome were patients who underwent intraoperative perforation (n = 3) and the patients with postoperative complications affecting the central visual axis: (n = 2 [hemorrhage in the interface and herpetic simplex keratitis]). The mean preoperative visual acuity was 0.10 (range, 0.05 to 0.3). After a 3.8-month-follow-up, the mean best corrected visual acuity was 0.21 (range, 0.1 to 0.6). The visual results were better in patients with keratoconus (mean best corrected visual acuity: 0.22; range, 0.1 to 0.6). The mean postoperative astigmatism was 4.15 diopters (range, 0 to 8). CONCLUSION: Intrastromal air and viscoelastic substance injection appeared to be very useful for performing a very deep lamellar keratoplasty. The results of the refractive outcome were encouraging. Deep lamellar keratoplasty is an interesting alternative to penetrating keratoplasty, because it cannot induce progressive primary graft failure and allogenic endothelial graft rejection and it obviates the need to perform a lamellar dissection of the donor button.

Adult↗
PubMed1983

Unilateral dermatomal superficial telangiectasia.

A new case of unilateral dermatomal superficial telangiectasia (UDST) is described, bringing the number of reported cases to 48. This case is unusual in that there was no underlying systemic disorder and no correlation between the onset of the disease and the physiologic hormonal states that have frequently been reported with the acquired type of UDST. The etiopathogenetic mechanisms of this disorder are discussed.

Humans↗