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Biomedical subjects

H Cohn

Publications and source records attributed to H Cohn.

At least 19 recordsLinked to original sources
PubMed1997

Reproducibility of optic nerve head topographic measurements with the glaucoma-scope.

PURPOSE: Glaucoma is an optic neuropathy in which optic nerve changes are important in diagnosis and progression, because the visual field may remain normal even while the optic nerve is undergoing significant damage. Accurate methods to objectively document the appearance of the optic nerve are necessary. In order for an optic disc imaging system to be clinically useful for detecting change, its reproducibility must be established. METHODS: We measured the reproducibility of duplicate measurements in 59 eyes of 31 consecutive patients, grouped into glaucoma subjects (n = 29) and eyes with glaucoma (n = 30), with the 3.10 OIS Glaucoma-Scope. In order to simulate two visits on one day, sets of three optic disc images were obtained first, followed by a repeat set, and the best disc images of each (chosen by the computer) were compared. RESULTS: The coefficients of variation of duplicate measurements for glaucoma suspects and patients with glaucoma were respectively: vertical cup/disc (c/d) ratio, 6.3% and 3.47%; horizontal c/d ratio, 4.61% and 2.97%; c/d area, 3.29% and 1.37%; cup area, 1.82% and 1.72%; mean position (MP) disc, 13.3% and 10.42%; MP total, 10.1% and 13.2%. For three eyes the examination was not possible (opacification of posterior capsule, miosis). CONCLUSION: These results suggest that the 3.10 version of the OIS Glaucoma-Scope allows reproducible measurements in living eyes.

Adult↗
PubMed1997

Sensitivity and specificity of optic disc variables and analysis of a new variable (MP/D) for glaucoma diagnosis with the Glaucoma-Scope.

AIM: In an attempt to use the quantitative optic disc measurements of the Glaucoma-Scope (OIS Sacramento, CA, USA) to distinguish glaucomatous from normal optic discs, a new variable was investigated, the mean disc corrected for the disc size by dividing by the disc area: MP/D. METHODS: Glaucoma-Scope disc evaluation was performed on 81 eyes of 51 patients split into the following groups based on Humphrey 24-2 visual field and clinical criteria of glaucoma: chronic glaucoma n = 27 (including only early, n = 17, and low tension glaucoma, n = 10), ocular hypertension n = 24, pseudoglaucomatous large discs, n = 12, and normal eyes, n = 18. Classic optic disc variables (the vertical and horizontal c/d ratios, and the c/d area) were compared with the new MP/D index calculating receiver operating characteristic curves. RESULTS: The MP/D ratio was able to identify the glaucomatous eyes more easily than other ratios. Areas under the curves were: 0.91 (MP/D); 0.87 (c/d area); 0.85 (c/d vertical); and 0.80 (c/d horizontal). The MP/D index was also correlated with the mean deviation (r = 0.466; p = 0.001). CONCLUSION: MP/D may prove useful in detecting glaucomatous optic nerve damage and could be an interesting screening tool for primary open angle glaucoma.

Adult↗
PubMed1995

[Efficacy and tolerability of 2 presentations of eyedrops combining carteolol 2% and pilocarpine 2% in primary open-angle glaucoma and simple ocular hypertension].

PURPOSE: The aim of the study was to compare 2 combinations of eye drops containing 2% carteolol and 2% pilocarpine: LCM 1010: ready to use eye drops CBS 341A: eye drops to be reconstituted (freeze-dried powder + solvent). METHODS: Ninety-seven patients with primary open angle glaucoma or simple ocular hypertension were included in a randomized, double-blind multicentric study comparing 2 parallel groups of treatment. Intra-ocular pressure was greater than 21 mmHg with beta-blocker alone. One instillation of 2% carteolol-2% pilocarpine combination was given twice a day for one month. Before and after this treatment, intra-ocular pressure was measured at 9 am (12 hours after evening instillation) and at 11 am (2 hours after morning instillation). RESULTS: Both treatments reduced intra-ocular pressure by a comparable amount and there was no significant difference between groups at either measure: at 9 am: 2.11 +/- 2.39 mmHg (mean +/- SD) for LCM 1010 1.79 +/- 1.73 mmHg for CBS 341 A p = 0.25 at 11 am: 3.75 +/- 3.83 mmHg for LCM 1010 3.40 +/- 1.69 mmHg for CBS 341 A p = 0.42. Both eye drops were generally well tolerated. CONCLUSION: Efficacy and safety of ready to use eye drops 2% carteolol-2% pilocarpine combination proved to be comparable to that of eye drops to be reconstituted in the treatment of ocular hypertension poorly controlled by beta-blocker eye drops alone.

Adrenergic beta-Antagonists↗
PubMed1994

Sex differences in the left and right hemifields of normal subjects with computerised static perimetry.

Results of routine perimetric testing of the left and right hemifields in normal subjects have been assumed to be symmetric although asymmetry due to hemispheric dominance has been established for other psychophysical tests. These asymmetries have sometimes been related to sex. With the advent of computerised static perimetry, subtle differences between the left and the right hemifields might be found that were not obvious before. This study investigated differences in retinal sensitivity between the hemifields and the role of sex and eye dominance. Forty three unequivocally right handed and right eye dominant normal adult volunteers, 24 females and 19 males, underwent Humphrey 24-2 testing, half beginning with the left eye, the other half with the right eye. The Peridata program was used to calculate decibel totals per hemifield. Four subjects were excluded because of poor cooperation or test artefacts. In females, the total of the left hemifield was significantly less than the right (p < 0.01) by a mean 18.2 (SD 24) dB equivalent to a difference of 0.34 dB per tested point. No significant difference in hemifields was found for males, between the sexes for both eyes combined, or between the two eyes for either sex. It was concluded that asymmetries in retinal sensitivity with respect to the vertical axis may be physiological and found in females, but not in males.

Adult↗
PubMed1992

Indications for trabeculectomy in open angle glaucoma.

Trabeculectomy is the most commonly performed filtering procedure in the surgical treatment of open angle glaucoma. One may oversimplify and state that a trabeculectomy is indicated in a case of uncontrolled IOP on maximum tolerated medical therapy in the presence of significant optic disk and/or visual field changes. However, before one actually proposes a trabeculectomy one must consider for a given patient: How does one define IOP control? What are the chances of success of the surgery? What are the operative risks? What are the risks of not operating for the case under consideration? And more generally: What are the arguments of earlier surgery? Where does Argon Laser Trabeculoplasty fit into the therapeutic regimen? The questions are examined with the specific goal of making a rational decision for the patient at hand.

Glaucoma, Open-Angle↗
PubMed1991

[Intranasal midazolam in pediatric ophthalmology].

Intranasal midazolam was tested in pediatric patients undergoing ophthalmological examination. 15 children aged 3.5 months to 10 years received 0.35-0.5 mg.kg-1 intranasal midazolam in association with a corneal anesthesia. The onset of sedation was rapid and permitted adequate ocular examination in all cases. In 8 of 15 cases where surgery followed immediately, the induction of inhalational anesthesia was easier. No local or general adverse reaction was noted. This non-invasive method of anesthesia may be compared to the intrarectal administration of midazolam, but the rapid onset of sedation and a cleaner route seem more suitable in surgical environment.

Administration, Intranasal↗
PubMed1979

Retinal complications of gas myelography.

Bilateral retinal and preretinal hemorrhages with an acute and permanent partial loss of visual acuity developed in a 60-year-old man after an oxygen myelogram. In order to increase the contrast of the myelogram, a greater volume of oxygen was injected in the subarachnoid space than the volume of CSF that was removed. It is believed that the hemorrhages and visual loss were secondary to the sudden increase in CSF pressure caused by the excess volume of oxygen injected.

Humans↗
PubMed1979

Marginal corneal ulcers with acute beta streptococcal conjunctivitis and chronic dacryocystitis.

A 73-year-old woman had right dacryocystitis, intense conjunctival hyperemia and chemosis, marginal corneal ulcers, and abscesses and conjunctival cultures that were positive for beta hemolytic streptococci. A distinct lucid interval separated the peripheral corneal ulcers and infiltrates from the corneoscleral limbus. Gram stain of corneal scrapings revealed polymorphonuclear leukocytes but no bacteria, and corneal cultures were negative for bacteria. The peripheral corneal ulcers and abscesses in our patient with the lacrimal conjunctivitis of Morax clinically resembled the catarrhal ulcers found with staphylococcal blepharitis. A hypersensitivity or toxic reaction to streptococci or their products may have played a role in the development of the marginal ulcers in this patient.

Aged↗
PubMed1979

Myocardial infarction in dermatomyositis.

A case of dermatomyositis manifesting electrocardiographic and vectorcardiographic changes compatible with an inferior and anterolateral wall myocardial infarction is presented herein. The nonocclusive nature of the heart muscle damage is evidenced by perfectly normal coronary artery angiography. We believe that this is the first reported case of a myocardial infarction pattern apparently due to dermatomyositis.

Adult↗
PubMed1978

Appraisal of the PAM cell effect as a diagnostic test for multiple sclerosis.

The selective reduction of PAM cell yield reported by Carp and associates in the presence of tissue from patients with multiple sclerosis (MS) has been attributed to replication in culture of a viral agent associated with MS (MSAA). We investigated the diagnostic potential of the PAM cell effect in MS and in optic neuritis (ON). Six serum and 7 CSF samples from 7 patients with MS, 3 serum and 3 CSF samples from 4 patients with idiopathic ON, and 4 sera from 4 patients with ON induced by ethambutal toxicity were tested. Blind counting showed no reduction in PAM cell yield in the MS group nor any significant difference between the two ON groups. Disturbing inconsistencies in PAM cell growth rates over time and between control flasks were demonstrated.

Cells, Cultured↗