Comparison of Efficacy of Ultrasound Guided Erector Spinae Block vs Paravertebral Block for Postoperative Analgesia in Breast Surgeries.

Background: Effective management of postoperative pain (PSP) following breast surgeries is essential to improving recovery and preventing chronic pain syndromes. While the thoracic paravertebral block (TPVB) is the established standard for analgesia in breast surgeries, the erector spinae plane block (ESPB) has recently emerged as a simpler and safer alternative.

Aim: To compare the efficacy of ultrasound-guided erector spinae block (ESPB) versus paravertebral block (TPVB) for postoperative analgesia in breast surgeries.

Subpicomolar sensing of hydrogen peroxide with ovalbumin-embedded chitosan/polystyrene sulfonate multilayer membrane.

The use of ovalbumin (OVA)-immobilized layer-by-layer-assembled chitosan/polystyrene sulfonate membranes for the detection of hydrogen peroxide (H2O2) at subpicomolar levels is reported. The detection of mercuric chloride (HgCl2) and potassium iodide (KI) was also investigated. While the detection limits of HgCl2 and KI remained in the micromolar concentration range, H2O2 could be sensed to a remarkably lower range (subpicomolar).