Norepinephrine versus phenylephrine affects prethrombotic response in patients undergoing cesarean section under...

Area of Science:

• Anesthesiology
• Obstetrics
• Pharmacology

Background:

• Venous thromboembolism is a significant complication of cesarean sections.
• Norepinephrine (NE) is known to activate coagulation pathways.
• Understanding the impact of prophylactic vasopressors on coagulation is crucial for patient safety.

Purpose of the Study:

• To compare the effects of prophylactic norepinephrine (NE) versus phenylephrine (PHE) infusions on the prethrombotic response during cesarean sections under spinal anesthesia.
• To evaluate the impact of these agents on coagulation factors and markers.

Main Methods:

• A randomized study involving 66 women undergoing cesarean section under spinal anesthesia.
• Participants received either a fixed-rate NE or PHE infusion from the start to the end of the operation.
• Plasma levels of coagulation factor VIII activity (FVIII:C), fibrinogen, and D-dimer were measured pre- and post-procedure.

Main Results:

• Postoperative fibrinogen and D-dimer levels did not significantly differ from preoperative levels in the NE group, though FVIII:C decreased.
• Compared to the PHE group, the NE group showed increased postoperative levels of FVIII:C, fibrinogen, and D-dimer.
• These findings suggest a procoagulant effect of NE compared to PHE.

Conclusions:

• Norepinephrine (NE) does not appear to negatively impact the maternal prethrombotic response during cesarean sections.
• NE infusion led to increased levels of coagulation molecules compared to PHE, indicating potential benefits for hemostasis in cases of significant intraoperative bleeding.
• NE can be considered a safe option for managing hypotension during cesarean sections.