A 2024 systematic review and meta-analysis examined whether goal-directed strategies during on-pump cardiac surgery improve recovery compared with conventional care. Across seven randomized trials, the authors reported fewer postoperative complications and shorter intensive care and hospital stays, without a statistically significant mortality reduction. The review is relevant to perfusion practice, although varied protocols and inconsistencies in the publication limit how precisely its pooled results can be applied.
Moving Beyond a Fixed Pump-Flow Target
Goal-directed perfusion (GDP) connects flow management with the oxygen available to tissues. Cardiac index describes flow relative to body surface area, while indexed oxygen delivery (DO2I) also incorporates arterial oxygen content. Consequently, the same indexed flow can provide different oxygen delivery when hemoglobin concentration or arterial oxygenation changes.
Pratomo and colleagues reviewed randomized evidence involving adults undergoing cardiac surgery with cardiopulmonary bypass (CPB). Their central question was whether individualized, monitored management based on cardiac index, oxygen delivery, or related hemodynamic targets produces better postoperative outcomes than standard care. The intervention was not one uniform perfusion protocol.
What the Review Included
The investigators searched PubMed, CENTRAL, and Scopus through October 12, 2023. Seven trials published between 2013 and 2023 met their eligibility criteria. Procedures included coronary artery bypass grafting and valve surgery. The review reported a total of 1,128 participants.
Some trials specifically targeted oxygen delivery during bypass. Others used broader hemodynamic optimization approaches incorporating cardiac index, stroke volume variation, pressure, or additional variables. Depending on the trial and operative phase, interventions included changes in flow, fluid administration, vasoactive support, or transfusion. These differences matter: a pooled benefit cannot be attributed solely to a particular pump-flow adjustment or monitoring device.
Main Results
| Outcome | Reported pooled finding | Interpretation |
|---|---|---|
| ICU length of stay | Mean difference −0.33 days; 95% CI −0.59 to −0.07 in the Results section; p = 0.01 | A modest average reduction, with a conflicting upper confidence limit in the abstract. |
| Hospital length of stay | Mean difference −0.84 days; 95% CI −1.29 to −0.39; p = 0.0002 | Shorter average hospitalization in the pooled analysis. |
| Overall postoperative complications | Odds ratio 0.43; 95% CI 0.32–0.60; p < 0.00001 | Lower pooled odds across the included protocols; this is not an absolute risk reduction. |
| Mortality | Odds ratio 0.77; 95% CI 0.34–1.77; p = 0.54 | No statistically significant mortality benefit; the interval remains compatible with substantially different effects. |
The authors also reported favorable findings for acute kidney injury and selected cardiac complications. They did not find statistically significant pooled reductions in ventilation duration, additional volume, change in hemoglobin, or packed red-cell units transfused. A nonsignificant finding does not establish that two strategies have equivalent effects.
Why Oxygen Delivery Matters to Perfusion
The educational value of GDP is the link between flow and blood oxygen content. Hemodilution can reduce oxygen-carrying capacity even when an indexed flow target is maintained. Conversely, pressure alone does not describe how much oxygen is transported. The review therefore supports examining several physiologic measurements together rather than interpreting one number in isolation.
However, the paper does not identify one universally optimal DO2I threshold. It discusses different targets and monitoring approaches from the underlying literature. Those values should not be treated as interchangeable or converted into a universal transfusion trigger. The pooled analysis also cannot determine which component of a multicomponent protocol produced the observed benefit.
For related IPA educational coverage, see the goal-directed perfusion mini-compendium and the pilot study of higher cardiac index and pulsatile flow during CPB.
Important Limits and Reporting Inconsistencies
Pooling randomized trials strengthens the evidence base, but the included strategies differed in timing, monitoring, treatment targets, and co-interventions. The review reports substantial heterogeneity for several outcomes. This reduces confidence that the average effect describes every cardiac surgery program or every version of GDP.
Two internal inconsistencies deserve explicit attention. First, the abstract gives the ICU-stay confidence interval as −0.59 to +0.07 days, whereas the Results section gives −0.59 to −0.07 days. The latter is consistent with the reported p value of 0.01; this summary identifies the discrepancy rather than silently treating the abstract as correct.
Second, the review states that 1,128 patients were included, but its Results section lists 545 intervention patients and 556 controls, totaling 1,101. The sample sizes shown in Table 1 also sum to 1,101. Without clarification from the authors, the overall denominator remains uncertain. These issues do not prove that every pooled estimate is wrong, but they warrant caution when quoting numerical precision.
The evidence search ended in 2023. This is a review of that evidence window, not a complete assessment of studies available today. Its adult population also limits extrapolation to pediatric perfusion.
Practical Takeaway
The review supports continued interest in individualized perfusion management that considers both flow and oxygen delivery. Its strongest reported signals concern complications and recovery time, rather than survival. For education and quality improvement, the useful questions are what each protocol actually targeted, how consistently those targets were achieved, and whether local outcomes reflect the intended physiologic benefit.
This independent educational summary does not establish a patient-specific flow, transfusion, or vasoactive treatment protocol. Read the full publication for trial details, forest plots, and the authors’ discussion.
Original Article
Pratomo BY, Sudadi S, Setianto BY, Novenanto TT, Raksawardana YK, Rayhan A, Kurniawaty J. Intraoperative Goal-Directed Perfusion in Cardiac Surgery with Cardiopulmonary Bypass: The Roles of Delivery Oxygen Index and Cardiac Index. Annals of Thoracic and Cardiovascular Surgery. 2024;30(1). doi:10.5761/atcs.ra.23-00188. Released April 26, 2024.
The original publication carries a Creative Commons Attribution–NonCommercial–NoDerivatives license. The linked PDF is provided unchanged; the text above is an independently written IPA review. The cover is an AI-generated editorial illustration.
