Bilateral Erector Spinal Plan Block in Postoperative Analgesia After Total Abdominal Hysterectomy: An Observational Study

Postoperative pain, which starts with tissue damage as a result of surgical procedures, gradually decreases with wound healing and ends. Pain due to tissue damage is an acute pain that varies in severity according to its size and region. It creates physiopathological changes in many organs and tissues and has negative effects on systems. This situation causes serious postoperative morbidity and mortality in patients. For these reasons, postoperative pain control is very important. Inadequate pain control can cause acute pain to turn into chronic pain. The occurrence of pain in the diseased area before the operation, the severity of surgical tissue damage, environmental, psychological and genetic factors increase the rate of development of chronic pain.

Multimodal analgesia in postoperative pain management is a strategy that combines different analgesic methods to provide more effective analgesia and to reduce side effects. Compared to monotherapy, less dose requirement and better pain management are targeted thanks to the additive and synergistic effect of different analgesic drugs. Thanks to this reduced dose, the incidence of drug-related side effects in patients is also reduced.

Erector spina plan block (ESPB) is a new regional anesthesia method used especially in abdominal and thoracic surgeries. It was first described by Forero et al. for the treatment of thoracic neuropathic pain. ESP block in 2017 and 2018; Many case reports for analgesic purposes in cervical, thoracic, abdominal and pelvic pain have been published, but detailed clinical studies have not been found. Since then, it has been considered that this interfascial plane block can be applied as an alternative to the neuraxial block for certain surgeries.

Under the guidance of ultrasonography, regional anesthesia applications can be performed more safely, easily and effectively than methods such as electrical stimulation and loss of resistance based on the determination of superficial landmarks. Uncertainty about the relationship of the needle with the surrounding tissue in peripheral nerve blocks performed with the traditional blind method causes a higher risk of failure and complication of the application. For this reason, Erector spina plan blocks made in our clinic are performed under ultrasound guidance. Complication due to erector spina plane block (pneumothorax) was reported in only two articles. There is also a report in the literature reporting that lower thoracic erector spina plane block causes involuntary motor block. However, it is stated that the possible complications associated with the block may be due to the failure of the technique.

The erector spina plane block technique consists of an injection of 20 mL of 0.25% bupivacaine, guided by USG, between the erector spinae muscle and the transverse process below it. The procedure is performed after the patient is seated, in the prone position, or in the lateral decubitus position and the target vertebral level has been defined. A high frequency linear USG probe is placed 3 cm lateral to the spinous process. On the hyperechoic transverse process, hypoechoic M.latissimus dorsi and M.rector spina are defined. The needle is then advanced from cephal to caudal or from caudal to cephalad until it remains in the interfascial plane. The correct position of the needle is confirmed by observing intramuscular diffusion of the drug following bupivacaine injection.