This study aimed to assess the correlation, agreement, and trending ability between external jugular venous oxygen saturation (SejvO2) and central venous oxygen saturation (ScvO2) across varying hemodynamic states in anesthetized dogs. Six healthy dog...
This study aimed to assess the correlation, agreement, and trending ability between external jugular venous oxygen saturation (SejvO2) and central venous oxygen saturation (ScvO2) across varying hemodynamic states in anesthetized dogs. Six healthy dogs were included in this prospective, non-randomized, repeated-measures study. Each dog was anesthetized, paralyzed, and mechanically ventilated. Six sequential hemodynamic states were experimentally induced: baseline, controlled hemorrhage, isotonic crystalloid resuscitation, autotransfusion, continuous rate infusion of dobutamine, and administration of high-concentration isoflurane. Simultaneous blood samples were collected from the central and external jugular venous catheters. Paired ScvO2 and SejvO2 values were analyzed for correlation, agreement, and trending ability. Thirty-six paired samples were obtained. SejvO2 and ScvO2were strongly correlated (r = 0.71). Bland–Altman analysis demonstrated a mean bias of –4.47% with limits of agreement from –14.25% to 5.31%, exceeding the predefined ±8% threshold. The concordance rate was 66.7% and improved to 87.5% when an exclusion zone of ±5% was applied, indicating moderate trending ability. In conclusion, although SejvO2 was strongly correlated with ScvO2, it did not demonstrate sufficient agreement for direct substitution. Nevertheless, it showed a moderate capacity to track directional changes under different hemodynamic conditions. Clinically, SejvO2 may serve as a less invasive alternative for serial monitoring of oxygen balance when direct ScvO2 measurement is not feasible, supporting its potential role in critical care monitoring.