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Hemostasis defects associated with cardiac surgery, prosthetic devices, and other extracorporeal circuits
Insights
Preventing bleeding during cardiopulmonary bypass (CPB) surgery requires thorough preoperative evaluation. This includes detailed patient history, physical exams, and specific hemostasis tests to identify potential bleeding risks.
Area of Science:
- Cardiovascular Surgery
- Hematology
- Anesthesiology
Background:
- Cardiopulmonary bypass (CPB) surgery is associated with significant risks of hemorrhage.
- Alterations in hemostasis can occur due to CPB, prosthetic devices, and apheresis.
- Effective management of surgical bleeding necessitates a comprehensive understanding of hemostatic mechanisms.
Purpose of the Study:
- To review the literature on hemostatic alterations related to CPB surgery, prosthetic devices, and apheresis.
- To emphasize the importance of preoperative assessment for preventing CPB-related hemorrhage.
- To outline essential diagnostic and therapeutic strategies for managing surgical bleeding.
Main Methods:
- Review of available literature on hemostasis in surgical contexts.
- Emphasis on detailed patient history, including bleeding/thrombotic tendencies and drug use.
- Inclusion of physical examination findings and presurgical laboratory screening (PT, PTT, platelet count, bleeding time, thrombin time).
Main Results:
- Adequate preoperative workup is crucial for preventing CPB hemorrhage.
- Standardized hemostasis testing identifies defects in vascular and platelet function.
- Most nontechnical and cardiovascular surgical hemorrhage cases stem from identifiable hemostatic defects.
Conclusions:
- Thorough preoperative evaluation, including history, physical exam, and targeted laboratory tests, is key to preventing surgical bleeding.
- Identifying and addressing hemostatic defects proactively can mitigate hemorrhage risks.
- A collaborative team approach involving surgeons, pathologists, and hematologists ensures optimal patient care and bleeding management.
Abstract:
This discussion has provided a review of the available literature regarding alterations of hemostasis associated with CPB surgery, the use of prosthetic devices, and apheresis. The key to prevention of CPB hemorrhage is to obtain an adequate preoperative workup. Of extreme importance is an adequate history with respect to bleeding tendencies and thrombotic tendencies in both the patient and the family; of equal importance is a careful history regarding the use of drugs affecting hemostasis, especially drugs known to interfere with platelet function. A careful physical examination, searching for clues of a real or potential bleeding diathesis, may also prevent catastrophic cases of hemorrhage. An adequate presurgical screen must be performed in surgical patients. In addition to the usual prothrombin time, partial thromboplastin time, and platelet count, a standardized template bleeding time (and thrombin time in patients subjected to CPB) should be performed. The use of these simple testing modalities will guard against significant defects in vascular and platelet function. Most instances of nontechnical surgical and cardiovascular surgical hemorrhage are due to several well-defined defects in hemostasis that should be readily controlled if approached in a logical manner as a team effort among surgeons, pathologists, and hematologists.