Representative ARI effects evoked by stellate ganglion stimulation prior to (intact) and following successive T1–T4 root transections. Unilateral T1–T4 dorsal root transections shortened baseline ARI; however, there was no change in the magnitude of ARI shortening with stellate stimulation and unilateral dorsal root (LDRTx), ventral root (LVRTx), or contralateral dorsal/ventral root transections (RDVRTx). Left stellate ganglion stimulation (LSS) preferentially shortened ARIs, particularly in the left lateral and posterior ventricular walls. In contrast, right stellate ganglia stimulation (RSS) preferentially shortened ARIs in the right and anterior left ventricular walls.