| Full text | |
| Author(s): |
Taylor, Polly M.
[1]
;
Crosignani, Nadia
[2]
;
Lopes, Carlize
[2]
;
Rosa, Ademir C.
[2]
;
Luna, Stelio P. L.
[2]
;
Puoli Filho, Jose N. P.
[2]
Total Authors: 6
|
| Affiliation: | [1] Topcat Metrol Ltd, Little Downham CB6 2TY, Ely - England
[2] Sao Paulo State Univ, Dept Vet Surg & Anesthesiol, Fac Vet Med & Anim Sci, UNESP, Botucatu, SP - Brazil
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | VETERINARY ANAESTHESIA AND ANALGESIA; v. 43, n. 1, p. 99-108, JAN 2016. |
| Web of Science Citations: | 9 |
| Abstract | |
Objective To examine the relationship between probe tip size and force readings of mechanical nociceptive thresholds (MTs) to identify appropriate probes for horses. Study design Randomized, crossover study. Animals Eight adult, mixed-breed horses aged 5-10 years, weighing 268-460 kg. Methods Four probe configurations (PCs) were used in random sequence: 1.0 mm diameter (SHARP); 3.2 mm (BLUNT); spring-mounted 1.0 mm (SPRING), and 3 x 2.5 mm (3PIN). A remote-controlled unit on the horse increased force (1.2 N second(-1)) in a pneumatic actuator on the metacarpus. Mean MT for each PC was calculated from 10 readings for each horse. Data were log-transformed for analysis using mixed-effects ANOVA/linear regression (p < 0.05). Variability of data for each PC was assessed using the coefficient of variation (CV). Results Mean +/- standard deviation MTs were: SHARP, 5.6 +/- 2.3 N; BLUNT, 11.4 +/- 3.4 N; 3PIN, 9.6 +/- 4.6 N, and SPRING 6.4 +/- 1.8 N. Mean MT for SHARP was significantly lower than for BLUNT (p < 0.001) and 3PIN (p < 0.001), but not different from SPRING (p > 0.05). Mean MT was significantly higher for BLUNT than for 3PIN (p < 0.05) and SPRING (p < 0.001). Mean MT for 3PIN was significantly higher than for SPRING (p < 0.001). Larger contact area PCs produced higher MTs than smaller PCs, but the relationship was not linear. BLUNT (area: 10-fold greater) gave a MT two-fold higher than SHARP. 3PIN (area: 20-fold greater) produced more variable MTs, less than two-fold higher than SHARP. SPRING was similar to SHARP. CVs were: SHARP, 22.9%; BLUNT, 72.3%; 3PIN, 44.2%, and SPRING, 28.7%. Conclusions and clinical relevance The PC has nonlinear effects on MT. Therefore, it is important to define PC when measuring MT. Smaller probe tips may be preferable as MT data are less variable. (AU) | |
| FAPESP's process: | 10/08967-0 - Evaluation of clinical and experimental pain in animals |
| Grantee: | Stelio Pacca Loureiro Luna |
| Support Opportunities: | Research Projects - Thematic Grants |