We read with great interest the recent publication by Utrilla-Alvarez and colleagues 1 comparing the venous excess ultrasound (VExUS) score against the mean systemic filling pressure (P msf ) in post elective cardiac surgery patients. Exclusion criteria were right heart failure, tricuspid regurgitation, and atrial fibrillation amongst other reasons.VExUS and P msf were determined on admission to the post-anesthesia unit, and repeated 24 and 48 h later. The P msf was estimated simultaneously by two methods: the arm-occlusion technique of Anderson, and the mathematical approach of Parkin and Leaning (i.e., the mean systemic pressure analogue, P msa ). The Anderson method isolates the arm circulation by rapidly (within fractions of a second) inflating a special pressure cuff. The equilibrated arterio-venous pressure from the radial artery (P arm ) is taken to estimate P msf . Conversely, the P msa is calculated from right atrial pressure (P ra ), mean arterial pressure, and cardiac output, without any intervention. 2,3 The authors found that essentially all patients (59/60) had a VExUS zero on postoperative admission; at 24 h 54/60 patients had either VExUS zero or one, and at 48 h 17 patients had VExUS two and six patients had VExUS 3, representing severe congestion. Both P arm and P msa increased from baseline to 24 and 48 h, however, P arm values were greater in absolute and relative terms. The authors reported a significant relationship only between the P arm (i.e., not the P msa ) and VExUS score.