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Biomedical subjects

P Henkind

Publications and source records attributed to P Henkind.

At least 19 recordsLinked to original sources
PubMed1992

Role of diabetes mellitus on the natural history of central retinal vein occlusion.

In order to elucidate the role of diabetes mellitus on the natural history of central retinal vein occlusion, we compared two groups of central retinal vein occlusion, one with diabetes mellitus (32 patients) and one without diabetes mellitus (113 patients). The two groups were quite similar with respect to age, sex, systemic hypertension and glaucoma. No fellow eye had proliferative diabetic retinopathy. The diabetic group had angiographically a more ischemic type of central retinal vein occlusion (72%) than the nondiabetic group (39%; p less than 0.002). Diabetics with central retinal vein occlusion should be closely monitored.

Adolescent↗
PubMed1992

Mortality and morbidity in patients with central retinal vein occlusion.

We investigated the risk of mortality and morbidity in 78 patients with central retinal vein occlusion (CRVO) followed for more than 2 years (mean follow-up 7.2 years). Thirteen subjects died at an average of 7.0 years after CRVO. Five subjects developed myocardial infarction at an average of 2.8 years after CRVO, and 1 developed a cerebrovascular accident 3 years after CRVO. Patients with CRVO do not carry a higher risk of mortality and morbidity than matched controls derived from national surveys.

Adult↗
PubMed1992

Idiopathic preretinal macular gliosis: a retrospective study of 200 patients.

The charts of the last 200 patients with idiopathic preretinal macular gliosis (IPRMG) seen in the Retina Service of Montefiore Medical Center, Albert Einstein College of Medicine, were reviewed. We found that IPRMG is a disease of older people, tends to have a nonprogressive course, and rarely causes severe visual loss. In our series, 91.5% of the patients were older than 50 years of age, 80% of eyes lost less than two lines of vision, and only 4% of eyes had a visual acuity 20/200.

Adult↗
PubMed1990

Optic disc size in central retinal vein occlusion.

Predisposing factors in central retinal vein occlusion (CRVO) have included various systemic disorders and glaucoma. Recent reports have suggested a possible relation between specific anatomic configurations of the optic nerve head and the development of anterior ischemic optic neuropathy. The authors analyzed several optic disc parameters in 57 ocular normotensive patients with unilateral CRVO and in 27 control subjects. There was no significant difference in the horizontal disc diameter and cup-to-disc ratio between eyes with unilateral CRVO, fellow eyes with CRVO, and control eyes. The current data suggest that there is no relation between optic disc size and CRVO.

Fundus Oculi↗
PubMed1986

Ultrastructure of Bruch's membrane after krypton laser photocoagulation. I. Breakdown of Bruch's membrane.

Previous observations on rats suggested that subretinal neovascularization does not require a prior break in Bruch's membrane (BM). We verified this observation by using scanning electron microscopy to examine large expanses of BM that became exposed following ophthalmoscopically white krypton laser burns. Bruch's membrane appeared intact in the acute phase after injury. Subsequently, slitlike defects in BM were associated with penetrating choroidal capillaries. These observations were consistent with transmission electron microscopic findings of cellular protrusions arising from the choriocapillary endothelial cells and from regenerating retinal pigment epithelial (RPE) cells invading BM. These cell-formed defects in BM differed from thermal defects in appearance, size, and onset of occurrence. Endothelial cells penetrated all layers of BM, including the RPE basement membrane. We conclude that endothelial cells can erode their own basement membrane and the RPE basement membrane, and krypton laser burns with or without immediate rupture of BM induce cellular activity that may result in defects in BM.

Animals↗
PubMed1986

Ultrastructure of Bruch's membrane after krypton laser photocoagulation. II. Repair of Bruch's membrane and the role of macrophages.

The accompanying ultrastructural study showed that ophthalmoscopically white krypton laser photocoagulation in rats is followed by cellular invasion causing breakdown of Bruch's membrane (BM). We have expanded these observations, using scanning electron microscopy, transmission electron microscopy, and high-voltage transmission electron microscopy to describe the healing process. The repair of BM involves regenerating retinal pigment epithelial cells and choriocapillaris (CC) that form new basement membranes and fibroblasts that secrete collagen and elastin. The reformation of the CC is also associated with subretinal neovascularization. The involvement of macrophages was evident throughout the process of BM repair and formation of new vessels. We propose that the macrophages act as a common factor linking the diverse diseases associated with choroidal subretinal neovascularization, deduced from our evaluation of the healing process and the reformation of choriocapillaris.

Animals↗
PubMed1979

Schwann cell proliferations mimicking medullated retinal nerve fibers.

Ophthalmoscopically visible white patches in the optic nerve head and adjacent retina in a rhesus monkey histologically represented peripheral rather than central nervous myelin. This case of Schwann cell proliferations appearing as medullated retinal nerve fibers raises questions concerning the relationship of this phenomenon to developmental and acquired lesions of the optic nerve head in man.

Animals↗
PubMed1979

Chalazia.

Explore the source record for details and available documents.

Eyelid Neoplasms↗
PubMed1979

Microcysts of the human iris pigment epithelium.

Microcysts of the iris pigment epithelium have been described in association with diabetes mellitus, systemic mucopolysaccharidoses. Menkes's syndrome, and in neonates. Our study covers 68 cases obtained at necropsy. We specifically examined the iris pigment epithelium for vacuolation. We found that microcysts are more widespread than previously thought. In our series 57.3% of the cases reviewed by the light microscope showed microcysts. Of interest was the relationship of malignant neoplasm to iris pigment epithelium microcyst: 69.4% of cases with malignancy showed microcyst, whereas only 30% of the cases without neoplasms showed microcysts. Patients treated with exogenous steroid also had a raised incidence of microcysts.

Adrenal Cortex Hormones↗
PubMed1978

Some observations about retinal vascular-neuronal interrelationships.

The relationship between the intraretinal vessels of the human fundus and the surrounding neuronal tissue is discussed with regard to various disease states. Present evidence suggests that primary retinal neuronal death does not lead to secondary retinal capillary death. Primary retinal capillary non-perfusion generally leads to concomitant retinal neuronal degeneration, but if the occlusion takes place over a long period of time the surrounding neural retina may survive. It is suggested that many retinal degenerative changes, including retinal detachment, are due to primary retinal vascular alterations.

Humans↗
PubMed1978

Ocular neovascularization. The Krill memorial lecture.

The various vascular systems of the eye can undergo new vessel formation. In this presentation, I discuss new vessel growth in the cornea, lens, iris, ciliary body, choroid, retina, and optic nerve head. No single factor can explain all cases of ocular neovascularization; instead there are multiple factors which can affect the various susceptible vessels. Among the known vasculognic factors are: inflammation and its products, a hypoxic retina diffusable factor, the "tumor angiogenic factor," and possibly an aging factor. The different ocular beds possess differing sensitivity to the various vasculogenic stimuli; the iris and choroid being most sensitive and the retina and ciliary body least sensitive to such stimuli. Retinal neovascularization requires both a biochemical factor and a diseased retinal vascular bed for its induction. Ocular neovascularization is a dynamic process which requires a persisting stimulus or else the new vessels tend to regress. The normal eye seems to possess at least two antivasculogenic agents.

Anemia, Sickle Cell↗