Linked Life Data

9831765

Source:http://linkedlifedata.com/resource/pubmed/id/9831765

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2-3
pubmed:dateCreated
1999-1-22
pubmed:abstractText
Hereditary retinal dystrophies are most often disorders of photoreceptors and/or the retinal pigment epithelium. Structures secondary to the photoreceptor layer such as bipolar, horizontal, amacrine and ganglion cells are secondarily involved. In later stages of the disease a mild to moderate loss of inner retina occurs, but the second and third neurons remain surprisingly viable even in late and severe stages of retinal dystrophies. The function of the inner retina in patients suffering from hereditary retinal dystrophies is not easy to determine because it depends on the input of photoreceptors. The electroretinogram (ERG) offers several possibilities in this respect: b-wave, off-response (off-ERG), oscillatory potentials, scotopic threshold response of the flash ERG and the pattern ERG (PERG). We looked at two ERG tests: the PERG and the off-ERG. The PERG is an indicator of ganglion cell function. Its amplitude is related to the photoreceptor input determined by the flash ERG and visual field testing. But in cases of an undetectable flash ERG response the PERG can be recorded in some patients, but not in others. This may be an indication of a different effect on inner retinal function in different groups of patients. On- and off-responses are related to the function of depolarizing and hyperpolarizing bipolar cells. Evaluation of 301 patients with various retinal dystrophies revealed that most hereditary disorders primarily affect the photoreceptors or the pigment epithelium. In some patients, alterations of the on- and off-response amplitudes or implicit times were indicative of inner retinal disorders and different pathophysiologic mechanisms. However, interpretation has to be made carefully, as on- and off-responses may be influenced by dysfunction of photoreceptor synapses to bipolar cells, bipolar cells, Müller cells and intercellular matrix.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:issn
0001-5180
pubmed:author
pubmed:issnType
Print
pubmed:volume
162
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
169-77
pubmed:dateRevised
2007-7-2
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Inner retinal function in hereditary retinal dystrophies.
pubmed:affiliation
Charité-Virchow Eye Hospital, Berlin, Germany. ruether@ukrv.de
pubmed:publicationType
Journal Article, Comparative Study, Research Support, Non-U.S. Gov't