To the Editor,The erector spinae plane block (ESPB) has emerged as a valuable regional anesthesia technique for a range of thoracic, abdominal, and other procedures. Early cadaveric injection and computerized tomographic scan imaging studies 1,2 have suggested that the local anesthetic spreads

Purpose Despite the popularity of the erector spinae plane (ESP) block, both the mechanism of the block and the extent of injectate spread is unclear. This study used magnetic resonance imaging (MRI) to evaluate the spread of local anesthetic injectate following ESP blocks in six patients with pain. Methods Six patients received a left-sided ultrasoundguided ESP block at the T10 level. The injectate contained 29.7 mL of 0.25% bupivacaine and 0.3 mL of gadolinium in the first patient, with an additional 5 mL (50 mg) of triamcinolone in the subsequent five patients. Sensory block to pinprick and cold as well as pain score (with 0 indicating no pain and 10 being maximum pain) were

No abstract