Abstract
The intraocular pressure (IOP) and its correlations with arterial carbon dioxide partial pressure (PaCO2) and arterial pH were studied in five crested caracaras (Caracara plancus) anesthetized with isoflurane (ISO) and sevoflurane (SEV). Baseline IOP values were measured in both eyes (M0). Brachial artery was previously catheterized to obtain blood gas and cardiorespiratory analysis. Anesthesia was induced with 5% ISO and maintained with 2.5% for 40 minutes. IOP measurements and blood samples were evaluated in different moments until the end of the procedure. After recovering, a second anesthesia was induced with 6% SEV and maintained with 3.5%. Parameters were evaluated at the same time points of the previous procedure. IOP reduced significantly (P= 0.012) from M0 at all time points and no significative changes were observed between ISO and SEV anesthesias. Correlation between IOP and PaCO2 and between PIO and blood pH were found only for SEV. IOP and blood pH decreased in parallel with IOP, whereas values of PaCO2 increased in caracaras anesthetized with isoflurane and sevoflurane.
Highlights
Intraocular pressure (IOP) is defined as the pressure exerted by the components of the eye against the fibrous tunics, and such parameter must remain stable in ophthalmic surgeries (Artru and Yoshiriro, 1999; Gelatt and Gelatt, 2001)
This study evaluated the IOP in crested caracaras (Caracara plancus) before and after isoflurane and sevoflurane anesthesia, and correlated its results with partial arterial pressure of carbon dioxide and blood pH
This study showed that both isoflurane and sevoflurane anesthesias decreased IOP values in crested caracaras, in accordance with previous publications on dogs and human beings (Sator et al, 1998)
Summary
Intraocular pressure (IOP) is defined as the pressure exerted by the components of the eye against the fibrous tunics, and such parameter must remain stable in ophthalmic surgeries (Artru and Yoshiriro, 1999; Gelatt and Gelatt, 2001). This study evaluated the IOP in crested caracaras (Caracara plancus) before and after isoflurane and sevoflurane anesthesia, and correlated its results with partial arterial pressure of carbon dioxide and blood pH. Significative increase in values of PaCO2 were seen during both ISO and SEV anesthesias (P=0.0022).
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