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[Effect of controlled hypotension using sodium nitroprusside on platelet aggregation]
M Heesen1, G V Dietrich, R Wirth
1Departamento de Anestesiología y Cuidados Intensivos, Universidad Justus-Liebig, Giessen, Alemania.
Revista Espanola De Anestesiologia Y Reanimacion
|October 1, 1995
Summary
Sodium nitroprusside (SNP) attenuates the increase in platelet aggregation during surgery and the postoperative period. Impedance measurement is recommended for studying platelet aggregation due to turbidimetry
Area of Science:
- Anesthesiology
- Hematology
- Surgical Research
Background:
- Platelet aggregation is a critical hemostatic process.
- Surgical procedures and induced hypotension can impact platelet function.
- Understanding these effects is vital for patient safety and outcomes.
Purpose of the Study:
- To investigate the effect of sodium nitroprusside (SNP) on platelet aggregation during induced hypotension in surgical patients.
- To compare platelet aggregation in patients receiving SNP versus a control group.
Main Methods:
- Thirty patients undergoing elective ear, nose, or throat surgery were studied.
- Fifteen patients received SNP to maintain target hypotension (SNP group).
- Platelet aggregation was assessed using spontaneous platelet aggregation (SPA) via impedance and induced platelet aggregation (IPA) via turbidimetry.
Main Results:
- Both SPA and IPA showed significant changes during and after surgery in both groups.
- SPA increased progressively in both control and SNP groups, with a higher increase in controls.
- IPA decreased after anesthetic induction and remained low, but was higher in controls post-surgery.
Conclusions:
- Platelet aggregation increases during and immediately after surgery.
- SNP-induced hypotension attenuates the increase in platelet aggregation.
- Impedance measurement is superior to turbidimetry for detecting early increases in platelet aggregation during surgery.