Home
http://www.virbac.fr/ http://www.boehringer-ingelheim.com/ http://www.novartis.com/ http://www.animalhealth.bayerhealthcare.com/
vetcontact
Vetrinr
Tiermedizin
  WELCOME  
vetcontact
Vetrinr
Tiermedizin
  Privacy Policy  
  Home  
  Login / Newsletter  
vetcontact
Vetrinr
Tiermedizin
  CONTACTS  
vetcontact
Vetrinr
Tiermedizin
  Classifieds  
  New Products  
  VetCompanies  
  VetSchools  
vetcontact
Vetrinr
Tiermedizin
  PROFESSION  
vetcontact
Vetrinr
Tiermedizin
  Edutainment  
  VetAgenda  
  Presentations  
  Posters  
  ESAVS  
  Specialisation  
vetcontact
Vetrinr
Tiermedizin
  INSIGHT  
vetcontact
Vetrinr
Tiermedizin
  Congress News  
  Picture Galleries  
vetcontact
Vetrinr
Tiermedizin
  PRODUCTS  
vetcontact
Vetrinr
Tiermedizin
  Bayer  
  Boehringer Ing.  
  Novartis  
  Virbac

 
  Simply book for less...  
    

Bovine    Equine    Small Animal Practice    Swine Practice    Articles    Vetjournal    
deutsch english espaol polski francais
Home / WELCOME / Archiv / Equine /     
 
Electroretinograms in horses - new method without general anesthesia
Electroretinograms (ERGs) in horses are often indicated but sometimes not performed because of the risks of general anesthesia in this species. Komáromy and group developed a practical method for the recording of flash electroretinograms (ERGs) in sedated, standing horses with the DTL microfiber electrode.

The horses were sedated intravenously with detomidine hydrochloride (0.015 mg/kg). The pupil was dilated and the auriculopalpebral nerve was blocked. The ERGs were recorded with the active electrode on the cornea (DTL), the reference electrode near the lateral canthus, and the ground electrode over the occipital bone. The light intensities of the white strobe light were 0.03 cd·s/m2 (scotopic) and 3 cd·s/m2 (scotopic and photopic). Photopic and scotopic single flash and flicker responses to Ganzfeld stimulation were recorded. During the 20-min dark adaptation period the retina was stimulated every 5 min with the 0.03 cd·s/m2 single flash.

The median b-wave amplitudes and implicit times were 38 µV and 33 ms (photopic cone-dominated response), 43 µV and 63 ms (5-min dark adaptation), 72 µV and 89 ms (10 min), 147 µV and 103 ms (15 min), 188 µV and 109 ms (20 min, 0.03 cd·s/m2, rod response), and 186 µV and 77 ms (20 min, 3 cd·s/m2, maximal combined rod-cone response). A steady increase in amplitude and implicit time was noted during dark adaptation. No oscillatory potentials could be isolated.

The use of detomidine hydrochloride sedation and the DTL microfiber electrode allowed the recording of good quality ERGs. This protocol should permit the detection of functional problems in the retina without the risk involved with general anesthesia.


Source: Komáromy, A.M., Andrew, S.E., Sapp, H. L., Brooks, D.E., Dawson, W.W. (2003): Flash electroretinography in standing horses using the DTL microfiber electrode.
In: Veterinary Ophthalmology 6 (1), 27-33.

www.blackwell-synergy.com/links/doi: 10.1046/
j.1463-5224.2003.00261.x









Tell a friend   |   Print version   |   Send this article

EQUINE

Theiler´s disease in a Trakehner caused by contaminated tetanus vaccinemembers
An 11‐year‐old Trakehner gelding was presented for evaluation of lethargy, decreased appetite, mild icterus, and elevated hepatic enzyme activities. Physical examination, serum chemistry results, and liver biopsy histopathologic findings were supportive of Theiler`s disease. Polymerase chain reaction (PCR) testing results of serum and liver tissue were positive for nonprimate (equine) hepacivirus (NPHV) and a novel equine parvovirus‐hepatitis virus (EqPV‐H). A serious and finally fatal problem, caused by contaminated vaccine.

  • Limbal squamous cell carcinoma in a Rocky Mountain Horse and geneticsmembers
  • Subconjunctival bupivacaine, lidocaine, and mepivacaine and the corneal sensitivity in horsesmembers
  • Clodronate in horses with lamenessmembers
  • Valacyclovir in horses with equine multinodular pulmonary fibrosismembers
  • Radiculopathy associated with forelimb lameness in horsesmembers
  • Biological variations of routine blood parameters in horsesmembers
  • Prognosis for horses with deep digital flexor tendon injury after penetrating woundmembers
  • Possible maternal effect for the pace trait of horsesmembers
  • Flecainide on induced atrial fibrillation in horsesmembers
  • Sonographic technique to identify manica flexoria tears in horsesmembers
  • Novel prototype dynamic laryngoplasty system on arytenoid abductionmembers
  • Lipid peroxidation biomarkers in equine neuroaxonal dystrophymembers


  • [ Home ] [ About ] [ Contact / Request ] [ Privacy Policy ]

    Copyright © 2001-2018 VetContact GmbH
    All rights reserved