A thorough preoperative evaluation is essential for pregnant patients undergoing non-obstetric surgery to assess both maternal and fetal risks and optimize outcomes. This evaluation should begin with a comprehensive history that includes details about the current pregnancy, such as gestational age, any complications (e.g., gestational diabetes, preeclampsia), and obstetric history, including prior pregnancies, deliveries, and any known uterine abnormalities. Additionally, a detailed medical history focusing on pre-existing medical conditions (such as cardiovascular, respiratory, renal, or endocrine disorders) is crucial, as these conditions may impact anesthetic management or surgical outcomes. A review of medication history, including supplements and over-the-counter drugs, is necessary to identify potential teratogenic effects or interactions with anesthetic agents.
A meticulous physical examination should be conducted, with particular attention to airway assessment due to the increased risk of difficult intubation in pregnant patients. Cardiovascular evaluation should look for signs of heart failure or hypertension, while respiratory assessment should check for any evidence of upper airway obstruction or decreased lung capacity. The abdominal examination should assess for uterine size, contractions, or tenderness, which could indicate preterm labor or placental abruption. Given the increased risk of venous thromboembolism in pregnancy, a focused assessment for deep vein thrombosis is also important.
Laboratory tests should be tailored to the patient's comorbidities and the planned surgery. Routine tests often include a complete blood count (CBC) to check for anemia, infection, or thrombocytopenia; coagulation studies if there is a history of coagulopathy or preeclampsia; blood type and screen in case a transfusion is required; and renal and liver function tests. Additional tests, such as electrolytes, blood glucose, or a baseline arterial blood gas, may be necessary depending on the patient's condition. Cross-matching blood should be considered for patients at high risk for hemorrhage, such as those undergoing major abdominal surgery or with placental abnormalities.
