Intra-operative Cell Salvage for Cesarean Delivery: A Retrospective Study Using Propensity Score Matched Analysis
Cesarean delivery, while a life-saving procedure, carries significant risks, particularly obstetric hemorrhage, which remains a leading cause of maternal mortality. Placenta previa, characterized by the placenta overlying the internal cervical os, further elevates this risk due to abnormal placental implantation and heightened bleeding potential. Traditional reliance on allogeneic blood transfusion (ABT) introduces risks such as transfusion-related infections, immune reactions, and supply limitations. Intra-operative cell salvage (IOCS), a technique involving the collection, processing, and re-infusion of a patient’s own blood during surgery, has emerged as a promising alternative. This study evaluated the efficacy and safety of IOCS compared to ABT in patients undergoing cesarean delivery for central placenta previa, utilizing propensity score matching to address potential confounding variables.
Study Design and Patient Selection
The retrospective analysis included 361 patients diagnosed with central placenta previa who underwent cesarean sections between May 2016 and December 2018 at a single tertiary care center. Of these, 196 received autologous transfusion via IOCS, while 165 received ABT. Propensity score matching was applied to minimize selection bias, balancing baseline characteristics such as age, weight, American Society of Anesthesiologists (ASA) physical status, anesthesia type, and surgical duration. Post-matching, 137 pairs were included in each group, ensuring comparable demographics and clinical profiles.
Intra-operative Cell Salvage Protocol
The IOCS procedure utilized the Cell Saver BW-8200B system (WanDong Health Sources Corporation, Beijing, China). Blood lost during surgery was aspirated through a heparinized double-lumen suction system, separated from amniotic fluid using a dedicated suction channel. The collected blood underwent centrifugation to isolate red blood cells (RBCs), followed by saline washing to remove contaminants such as plasma, platelets, and cellular debris. Processed blood was further filtered through a leukocyte depletion filter to eliminate residual fetal cells, amniotic fluid components, and potential bacterial contaminants before re-infusion.
Key Outcomes and Findings
Reduced Allogeneic Transfusion and Improved Hemoglobin Levels
The IOCS group demonstrated a dramatic reduction in ABT requirements. Only 27% of IOCS patients required supplemental ABT, compared to 100% in the ABT group. The median volume of autologous blood re-infused was 300 mL (range: 100–1,800 mL). Post-operative hemoglobin levels were significantly higher in the IOCS group (101.3 ± 15.4 g/L vs. 96.3 ± 16.6 g/L, P = 0.009), alongside higher hematocrit levels (30.7% ± 4.3% vs. 28.8% ± 4.4%, P = 0.001).
Shorter Hospital Stays
Patients receiving IOCS had shorter total hospital stays (8.9 ± 4.1 days vs. 10.3 ± 5.2 days, P = 0.013) and shorter post-operative stays (5.3 ± 1.4 days vs. 6.6 ± 3.6 days, P < 0.001). Kaplan-Meier analysis confirmed that the IOCS group achieved earlier discharge (P < 0.001), likely reflecting reduced transfusion-related complications and faster recovery.
Safety and Coagulation Profile
No cases of amniotic fluid embolism, disseminated intravascular coagulation, or respiratory distress syndrome occurred in either group. Post-operative coagulation parameters, including activated partial thromboplastin time (APTT), prothrombin time (PT), and fibrinogen (FIB), remained stable in both groups, with no clinically significant differences pre- and post-operatively. Hemodynamic stability was maintained during autologous re-infusion, with no significant changes in mean arterial pressure or heart rate.
Inflammatory Response
Post-operative C-reactive protein (CRP) levels, a marker of inflammation, were lower in the IOCS group (49.9 ± 36.9 mg/L vs. 59.2 ± 37.1 mg/L, P = 0.038), suggesting reduced systemic inflammatory activation compared to ABT.
Clinical Implications and Limitations
The study highlights IOCS as a safe and effective strategy for managing obstetric hemorrhage in high-risk cesarean deliveries. By minimizing ABT dependence, IOCS reduces risks of transfusion-related adverse events and conserves limited blood resources. The shorter hospital stays associated with IOCS may also translate into cost savings and reduced healthcare burdens.
However, the retrospective design limits causal inferences, and the single-center nature may affect generalizability. Long-term outcomes, such as maternal-fetal alloimmunization risks or neonatal effects, were not assessed. Additionally, while propensity score matching addressed observable confounders, unmeasured variables could persist.
Conclusion
This study provides robust evidence supporting the integration of IOCS into obstetric practice for patients with placenta previa undergoing cesarean delivery. The technique not only reduces reliance on ABT but also enhances post-operative recovery, as evidenced by improved hemoglobin levels and shorter hospitalization. Future prospective, multi-center studies are warranted to validate these findings and explore long-term outcomes.
doi.org/10.1097/CM9.0000000000000620
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