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Pulse pressure and systolic pressure variation in horses under general anesthesia
Changes in arterial pressure due to respiratory phases have been used to predict fluid responsiveness in a number of species and pulse pressure variation (PPV) and systolic pressure variation (SPV) are commonly used. The relationship between PPV and SPV has not been described in horses. This study describes and compares PPV and SPV values of horses under general anesthesia.


Twenty-six horses undergoing general anesthesia and receiving mechanical ventilation were enrolled in the study.

Recordings of maximal and minimal values of pulse pressure and systolic pressure were calculated every 15 minutes throughout surgery.

Results: Initial PPV was 15.6% (7.9, 33.8) and decreased over the first 30 minutes to 10.7 ± 7.2% (P = 0.03).

Initial SPV was 10.3 ± 2.6% and decreased over the first 30 minutes to 7.3 ± 3.3% (P = 0.004). PPV and SPV had a correlation coefficient of 0.52 (P < 0.0001) and a 95% limits of agreement from −7.1% to 14.4%.

Conclusion: PPV and SPV measurements in horses do not have strong agreement.


Source: Langdon Fielding, C. and Stolba, D. N. (2012), Pulse pressure variation and systolic pressure variation in horses undergoing general anesthesia. Journal of Veterinary Emergency and Critical Care, 22: 372–375. doi: 10.1111/j.1476-4431.2012.00746.x




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EQUINE

Novel surgical treatment of recurrent laryngeal neuropathy in horses members
In horses, the only established method for reinnervation of the larynx is the nerve‐muscle pedicle implantation, whereas in human medicine, direct nerve implantation is a standard surgical technique for selective laryngeal reinnervation in human patients suffering from bilateral vocal fold paralysis. Thus, the objectives of this case series were
(1) To describe a modified first or second cervical nerve transplantation technique for the treatment of recurrent laryngeal neuropathy (RLN) in horses and (2) evaluate the outcomes of reinnervation using direct nerve needle‐stimulation of the first cervical nerve and exercising endoscopy before and after surgery.

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