Ultrasound-guided modified subcostal transversus abdominis plane block and influence of recumbency position on dye spread in equine cadavers.

Objective: To describe and evaluate an ultrasound-guided modified subcostal approach for the transversus abdominis plane (TAP) block in horse cadavers in lateral or dorsal recumbency.

Study Design: Prospective, experimental cadaveric study.

Animals: Study of one preserved foal and eight fresh adult horse cadavers.