Fig. 1From: Postoperative pain treatment with erector spinae plane block and pectoralis nerve blocks in patients undergoing mitral/tricuspid valve repair — a randomized controlled trialErector spinae plane block. ESM – erector spinae muscle, LA – local anesthetic, NS- needle shaft, RM- rhomboid muscle, T4 – the transverse process of the fourth thoracic vertebra, TM – trapezius muscleBack to article page