100+ Free Cert Critical Care(SA) Surg Practice Questions

Explanation: Current damage control resuscitation guidelines (e.g., PROPPR trial) recommend a balanced 1:1:1 transfusion ratio of PRBCs, FFPs, and Platelets for patients in severe traumatic hemorrhagic shock. This approach reconstitutes whole blood, mitigates early trauma-induced coagulopathy (TIC), and reduces overall mortality from exsanguination.

Explanation: Zone 1 extends from the left subclavian artery origin to the celiac artery. Balloon occlusion in Zone 1 is indicated for severe intra-abdominal or retroperitoneal hemorrhage originating below the diaphragm to maintain cerebral and coronary perfusion while controlling sub-diaphragmatic bleeding. Zone 3 is reserved for isolated pelvic hemorrhage.

Explanation: The R-time on TEG or Clotting Time (CT) on ROTEM represents the initial time required for thrombin generation and initiation of fibrin formation, driven by clotting factors. Prolongation indicates deficiency of coagulation factors, which requires correction with Fresh Frozen Plasma (FFP) or Prothrombin Complex Concentrate (PCC).

Explanation: FIBTEM evaluates clot firmness after platelet inhibition (using cytochalasin D). A low FIBTEM MCF (< 9-10 mm) specifically indicates hypofibrinogenemia. Fibrinogen is the first coagulation factor to reach critically low levels during massive hemorrhage. Cryoprecipitate or Fibrinogen concentrate is indicated.

Explanation: An elevated LY30 (> 3%) on TEG demonstrates hyperfibrinolysis, a hallmark of severe trauma-induced coagulopathy associated with high early mortality. Intravenous Tranexamic Acid (TXA) is the definitive antifibrinolytic indicated to inhibit plasminogen activation.

Explanation: The CRASH-2 trial established that TXA reduces mortality from post-traumatic bleeding when administered as early as possible and strictly within 3 hours of injury. TXA given after 3 hours is associated with an INCREASE in bleeding-related mortality and is contraindicated.

Explanation: Permissive hypotension (target MAP 50-65 mmHg, systolic BP 80-90 mmHg) balances organ perfusion while minimizing pressure-induced dislodgement of early unstable hemostatic blood clots ('pop-the-clot' phenomenon) before surgical control. Note: Permissive hypotension is strictly contraindicated in severe TBI.

Explanation: In an hemodynamically unstable patient with an unstable pelvic fracture and negative E-FAST, retroperitoneal pelvic venous and cancellous bone bleeding is the primary source. Immediate operative pre-peritoneal pelvic packing (PPP) combined with stabilization (external fixation) rapidly tamponades low-pressure pelvic bleeding. If arterial bleeding persists post-packing, angioembolization follows.

Explanation: BTF guidelines recommend maintaining CPP between 60 and 70 mmHg. CPP < 60 mmHg leads to cerebral ischemia and secondary brain injury, whereas aggressive elevation > 70 mmHg with vasopressors and fluids increases the risk of acute respiratory distress syndrome (ARDS) and cerebral edema without improving outcomes.

Explanation: Both Hypertonic Saline (HTS) and Mannitol are effective, but HTS is increasingly preferred as first-line osmotherapy because it expands intravascular volume (maintaining MAP/CPP) while creating an osmotic gradient across the intact blood-brain barrier. Mannitol can induce osmotic diuresis leading to hypovolemia and hypotension.