一、早期妊娠的麻醉许多与麻醉有关的药物和低温麻醉有致畸可能,胎盘形成前进行手术易诱发流产。因尚无局麻药致畸的报道,故急诊手术最好选用局部浸润或阻滞麻醉。脊髓麻醉(脊麻)在妊娠呕吐的患者可导致血容量减少和营养障碍,如过快阻断下半身植物神经,血压可明显下降。由于内分泌影响,早孕妇的呼吸循环系统已有改变,全麻时要加强监护。少量氯胺酮有安定心血管作用,可用于重度血容量不足患者,但剂量>1 mg/kg,可造成子宫过度紧张。终止妊娠的麻醉不必考虑对胎儿的影响,但应选用不引起弛缓性出血的药物。二、中期妊娠的麻醉胎盘分泌的孕酮使孕妇呼吸中枢的CO_2阈值下 First, the early pregnancy anesthesia Many anesthetic-related drugs and teratogenicity may be cryogenic anesthesia, placenta previa surgery to induce abortion. Because there is no local anesthetic teratogenic reports, so the best choice for emergency surgery partial infiltration or block anesthesia. Spinal anesthesia (spinal anesthesia) in patients with vomiting during pregnancy can lead to hypovolemia and nutritional disorders, such as excessive blocking of lower body autonomic nerve, blood pressure can be significantly reduced. Due to endocrine effects, early respiratory cycle in pregnant women have been changed, to strengthen guardianship during general anesthesia. A small amount of ketamine has a stable cardiovascular effect, can be used for patients with severe hypovolemia, but the dose> 1 mg / kg, can cause excessive uterine tension. The termination of pregnancy anesthesia need not consider the impact on the fetus, but should not use drugs that cause flaccid bleeding. Second, the medium-term pregnancy anesthesia secretion of progesterone to the respiratory center of pregnant women under the CO_2 threshold