An algorithm for the resuscitation of the pt in shock. Svo₂, saturation of hemoglobin with O₂ in venous blood; SVRI, systemic vascular resistance index; RVEDVI, right-ventricular end-diastolic volume index. CI, cardiac index in (L/min) per m²; ECHO, echocardiogram; Hct, hematocrit; HR, heart rate; PAC, pulmonary artery catheter; PCWP, pulmonary capillary wedge pressure in mmHg; SBP, systolic blood pressure; VS, vital signs; W/U, work up.