产前基础：预产期、产检与危险信号

🧠 为什么重要

NAEGELE'S RULE：末次月经的第一天，减去3个月，加上7天，并在需要时加一年。五月10日变为次年的二月17日。妊娠由阳性体征确认：约10 to 12周时通过Doppler听到胎儿心音、超声可视化，或检查者感受到胎动。推测体征（停经、恶心、乳房变化、16 to 20周时出现胎动感）和可能体征（hCG阳性、Hegar's、Goodell's和Chadwick's体征）都不是证据。产检每4周一次，直到28周；每2周一次，直到36周；然后每周一次。在受孕前服用400 mcg的FOLIC ACID，在妊娠期间每天服用600 mcg，以预防神经管缺陷。避免饮酒、生肉或未煮熟的肉和鱼、未经巴氏杀菌的乳制品和熟食肉类（listeria）、高汞鱼类以及猫砂（toxoplasmosis）。需要立即报告的危险信号包括：阴道出血、液体涌出、严重头痛、视力模糊或上腹痛（preeclampsia）、发热、排尿疼痛、持续呕吐以及胎动减少。

NAEGELE'S RULE: first day of the last menstrual period, subtract 3 months, add 7 days, and add a year when needed. May 10 becomes February 17 of the next year. Pregnancy is confirmed by POSITIVE signs: fetal heart tones by Doppler at about 10 to 12 weeks, ultrasound visualization, or fetal movement felt by the examiner. Presumptive signs (missed period, nausea, breast changes, quickening at 16 to 20 weeks) and probable signs (positive hCG, Hegar's, Goodell's and Chadwick's signs) are not proof. Visits are every 4 weeks until 28 weeks, every 2 weeks until 36, then weekly. Take 400 mcg of FOLIC ACID before conception and 600 mcg daily during pregnancy to prevent neural tube defects. Avoid alcohol, raw or undercooked meat and fish, unpasteurized dairy and deli meats (listeria), high-mercury fish, and cat litter (toxoplasmosis). DANGER SIGNS to report immediately: vaginal bleeding, a gush of fluid, severe headache, blurred vision or epigastric pain (preeclampsia), fever, painful urination, persistent vomiting, and decreased fetal movement.

🏥 真实场景

🌸 在32周时，一位患者提到“头痛严重且一直不好”，眼前有斑点，然后补充说她的戒指很紧。护士测量了她的血压（156/98），检测了她的尿蛋白，并联系了医疗提供者。妊娠20周后血压升高并伴有持续头痛和视力变化时，在证明并非如此之前，应视为伴有严重特征的preeclampsia，即使156/98低于严重范围（收缩压160或更高，或舒张压110或更高）。她戒指变紧值得注意，但肿胀在正常妊娠中很常见，并且不再是诊断标准。考试希望你能在惊厥出现之前将头痛、视力变化和血压联系起来。

🌸 At 32 weeks a client mentions a 'bad headache that won't quit' and spots in her vision, then adds that her rings are tight. The nurse checks her blood pressure (156/98), tests her urine for protein, and calls the provider. A raised blood pressure after 20 weeks with a persistent headache and visual changes is treated as preeclampsia with severe features until proven otherwise, even though 156/98 is below the severe range (systolic 160 or higher, or diastolic 110 or higher). Her tight rings are worth noting, but swelling is common in normal pregnancy and is no longer a diagnostic criterion. The exam expects you to connect the headache, the visual changes and the blood pressure before a seizure does.

📌 要点总结

• Naegele's rule：LMP − 3个月 + 7天（+ 1年）Naegele's rule: LMP − 3 months + 7 days (+ 1 year)
• Folic acid在受孕前400 mcg，在妊娠期间600 mcgFolic acid 400 mcg before conception, 600 mcg during pregnancy
• 妊娠晚期的头痛、视力变化和上腹痛意味着preeclampsia，直到证明并非如此Headache, visual changes and epigastric pain in late pregnancy mean preeclampsia until proven otherwise

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