Development and validation of the Ex-Care BR model: a multicentre initiative for identifying Brazilian surgical patients at risk of 30-day in-hospital mortality.

Background: Surgical risk stratification is crucial for enhancing perioperative assistance and allocating resources efficiently. However, existing models may not capture the complexity of surgical care in Brazil. Using data from various healthcare settings nationwide, we developed a new risk model for 30-day in-hospital mortality (the Ex-Care BR model).

Postoperative management of severe acute anemia in a Jehovah's Witness.

Background: Low levels of hemoglobin (Hb) are not rare in patients who refuse blood components but this case is unique due to the severity of anemia and the possibility that her previous episode of acute normovolemic hemodilution has influenced her outcome.

Case Report: We report an incident involving acute blood loss after surgery with an extremely low hematocrit. Despite her Hb levels (2.