Pregnancy-Associated Diseases

Pregnancy profoundly alters maternal physiology across multiple organ systems, creating distinct anesthetic challenges when surgical or medical interventions become necessary during gestation. The cardiovascular system undergoes dramatic remodeling through hormonal influences, with systemic vascular resistance declining substantially while cardiac output increases to compensate. A particularly dangerous phenomenon is aortocaval compression, where the enlarging uterus occludes the inferior vena cava when the mother lies supine, potentially triggering severe hypotension. Respiratory changes driven by progesterone elevate minute ventilation and reduce baseline carbon dioxide levels, but simultaneously decrease functional residual capacity, rendering pregnant patients vulnerable to rapid oxygen desaturation during periods without spontaneous breathing. The airway itself becomes increasingly edematous and friable due to capillary engorgement, elevating the likelihood of difficult intubation and failed airway management. Coagulation becomes hyperactive during pregnancy, substantially increasing venous thromboembolism risk. Regarding nonobstetric surgery, the second trimester offers the theoretically safest window for elective procedures, though urgent surgical needs should not be postponed; regional anesthesia is preferred when feasible to minimize fetal drug exposure. Preeclampsia, a multisystem disorder featuring new-onset hypertension and proteinuria after twenty weeks gestation, necessitates delivery as the definitive treatment while magnesium sulfate prevents seizure complications. Cardiovascular disease now represents the leading cause of pregnancy-related mortality, with particularly high-risk lesions including pulmonary hypertension and severe left-sided obstructive cardiac pathology; neuraxial techniques and vaginal delivery with early analgesia are generally favored. Maternal obesity, the most common significant medical comorbidity in obstetric anesthesia, markedly increases aspiration risk, difficult intubation incidence, and neuraxial catheter failure rates, necessitating early epidural placement and readily available emergency airway equipment. Throughout pregnancy-related anesthesia, a multidisciplinary team approach optimizes maternal and fetal outcomes across diverse clinical presentations.