Ultrasound guided erector spinae plane block as a cause of unintended motor block.

Erector spinae plane block (ESPB) as postoperative analgesia method has been successfully carried out in several surgical interventions. Postoperative pain treatment for cesarean section is considered one of the important challenges for anesthesiologists due to the risk of chronic pain development and even pospartum depression. Regional anesthesia techniques were effectively used to prevent the pain together with multimodal analgesia regimes in cesarean section. Formerly, successful erector spinae plane block was documented as postoperative analgesia treatment for cesarean section; however, no motor weakness was recorded as a side effect. In this case report, we present an unexpected motor weakness as a side effect of the erector spinae plane block after cesarean delivery operation in a 29 year old patient. To our knowledge, this is the first report of motor weakness related to the ESPB.