Pressure profile in the caudal extradural space of standing horses before and after extradural drug administration

The objectives of this study were to measure the pressure in the caudal extradural space of standing horses and to evaluate the usefulness of pressure waves to identify correct needle placement. Caudal extradural pressure was measured in 12 healthy horses. The pressure and any extradural pressure wa...

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Bibliographic Details
Published in:The veterinary journal (1997) 2009-04, Vol.180 (1), p.112-115
Main Authors: Iff, Isabelle, Mosing, Martina, Moens, Yves
Format: Article
Language:English
Subjects:
adverse effects
Anesthesia, Epidural - methods
Anesthesia, Epidural - veterinary
Anesthetics, Local - administration & dosage
Animals
central nervous system
Cerebrospinal Fluid Pressure - physiology
drug delivery systems
drug injection
Epidural Space - physiology
Extradural anaesthesia
Extradural analgesia
Extradural pressures
extradural space
Female
Horse
horses
Horses - physiology
Horses - surgery
Injections, Epidural - veterinary
Lack of resistance
lidocaine
Lidocaine - administration & dosage
Loss of resistance
Male
methodology
Pressure
skull
veterinary medicine
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Summary:The objectives of this study were to measure the pressure in the caudal extradural space of standing horses and to evaluate the usefulness of pressure waves to identify correct needle placement. Caudal extradural pressure was measured in 12 healthy horses. The pressure and any extradural pressure waves were recorded for 3 min after puncture, for 1 min after testing for lack of resistance (LOR), and for 10 min after lidocaine injection. Successful extradural drug administration was confirmed in all horses. The median extradural pressure findings after puncture, after LOR, immediately after injection and 10 min after needle placement were −1.60 kPa (range −2.27 to 1.33 kPa), −0.67 kPa (−2.27 to 5.73 kPa), 5.00 kPa (0.93 to 9.87 kPa) and 0.13 kPa (−0.67 to 4.53 kPa), respectively. Extradural pressure waves were not always present. Extradural space pressure was sub-atmospheric in most horses and extradural injection significantly increased this pressure for up to 10 min. Extradural pressure waves had limited usefulness in the confirmation of the correct placement of the needle.
ISSN:1090-0233
1532-2971
DOI:10.1016/j.tvjl.2007.10.024