Fluid, Blood, and Transfusion Management
What you must understand
Know fluid compartments and the difference between crystalloids and colloids. Understand maintenance and replacement needs, and the risks of both under-resuscitation and over-resuscitation. Know blood products: packed red cells, fresh frozen plasma, platelets, and cryoprecipitate, and their indications. Understand transfusion reactions (hemolytic, febrile, allergic, TRALI, TACO) and their immediate management. Know the principles of massive transfusion and balanced resuscitation. Understand that transfusion decisions depend on clinical status, not a single hemoglobin value alone. Recognize the risks of transfusion-transmitted infection and the importance of identification checks.
Traps in questions
A frequent trap is treating a hemoglobin number without considering symptoms or ongoing bleeding. Another is confusing TACO (volume overload) with TRALI (immune-mediated lung injury); both cause dyspnea but management differs. Watch for questions that assume colloids are always superior to crystalloids, or that ignore the need for crossmatching.
Rule of thumb
For acute blood loss, replace with the product that is missing: red cells for oxygen-carrying capacity, plasma for coagulation factors, platelets for platelet function. Use clinical endpoints, not numbers alone.