Fig. 4From: Postoperative pain treatment with erector spinae plane block and pectoralis nerve blocks in patients undergoing mitral/tricuspid valve repair — a randomized controlled trialPostoperative drain positions. The figure presents the positions of chest drains and the site of the incision. UD—upper drain, the proximal end in the apex of the lung, LD—lower drain, inserted horizontally (“lying on the diaphragm”), SI—surgical incisionBack to article page