Section 6.1: Antenatal Care, Complications of Pregnancy, and Family Planning

Comprehensive Antenatal Care

Antenatal care (ANC) is foundational to maternal and fetal well-being, aiming to identify risks, prevent complications, and promote healthy behaviors throughout pregnancy. The initial prenatal assessment establishes the baseline health status. The nurse must systematically gather the obstetrical history using the GP (Gravida/Para) or GTPAL (Gravida, Term, Preterm, Abortions, Living) systems. Physiological changes during pregnancy are profound, affecting every organ system. Cardiovascular adaptations include a 30-50% increase in blood volume, peaking around 28-32 weeks, which can lead to physiologic anemia of pregnancy due to hemodilution. Respiratory changes involve increased tidal volume and mild respiratory alkalosis to facilitate gas exchange across the placenta. Renal blood flow increases, often lowering blood urea nitrogen (BUN) and creatinine levels. Gastrointestinal alterations, largely mediated by elevated progesterone, cause decreased motility, predisposing the mother to constipation and heartburn.

Fetal well-being is monitored through fundal height measurement (McDonald's rule), fetal heart tones (detectable by Doppler at 10-12 weeks), and ultrasound. Health teachings during the antenatal period must address common discomforts (e.g., morning sickness, leg cramps, backache) and emphasize danger signs that warrant immediate medical attention, such as vaginal bleeding, sudden gush of fluid, severe headache, epigastric pain, or decreased fetal movement.

Complications of Pregnancy

High-risk pregnancies require vigilant monitoring and specialized interventions. Two critical conditions frequently encountered in the clinical and exam settings are Gestational Diabetes Mellitus (GDM) and Preeclampsia/Eclampsia.

Gestational Diabetes Mellitus (GDM)

GDM is defined as carbohydrate intolerance with onset or first recognition during pregnancy. It is primarily caused by the diabetogenic effect of pregnancy hormones, notably human placental lactogen (hPL), which induces insulin resistance to ensure adequate glucose supply for the growing fetus. Risk factors include advanced maternal age, obesity, family history of diabetes, and a previous macrosomic infant. Screening typically occurs between 24-28 weeks using an oral glucose tolerance test (OGTT).

Maternal and Fetal Risks:

• Maternal: Preeclampsia, operative delivery, polyhydramnios (due to fetal polyuria), and future risk of type 2 diabetes.
• Fetal: Macrosomia (birth weight > 4000g), hypoglycemia at birth (due to hyperinsulinemia responding to maternal hyperglycemia), respiratory distress syndrome (insulin delays surfactant production), and congenital anomalies if hyperglycemia was present during early organogenesis.

Management: Initial management focuses on diet and exercise. If euglycemia is not achieved, insulin therapy or oral hypoglycemic agents (e.g., metformin) may be initiated. Close fetal surveillance via biophysical profile (BPP) and non-stress tests (NST) is essential in the third trimester.

Preeclampsia and Eclampsia

Preeclampsia is a multisystem hypertensive disorder unique to pregnancy, occurring after 20 weeks of gestation. The classic triad historically included hypertension, proteinuria, and edema, though edema is no longer a diagnostic prerequisite. Pathophysiologically, it involves defective spiral artery remodeling leading to placental ischemia, systemic endothelial dysfunction, and vasospasm.

Diagnostic Criteria:

• Mild Preeclampsia: BP ≥ 140/90 mmHg on two occasions at least 4 hours apart, and proteinuria (≥ 300 mg/24 hours or ≥ 1+ on dipstick).
• Severe Preeclampsia: BP ≥ 160/110 mmHg, severe proteinuria, and signs of end-organ damage (e.g., elevated liver enzymes, thrombocytopenia, pulmonary edema, severe persistent headache, visual disturbances, epigastric or right upper quadrant pain).

Management: The definitive cure for preeclampsia is delivery of the fetus and placenta. In severe preeclampsia, the primary goal is preventing progression to eclampsia (the occurrence of generalized seizures) while controlling hypertension. Magnesium sulfate is the drug of choice for seizure prophylaxis, acting as a central nervous system depressant. Nurses must monitor for signs of magnesium toxicity, including loss of deep tendon reflexes, respiratory depression, and oliguria. Calcium gluconate must be readily available as the antidote.

Family Planning Methods

Family planning is a vital component of maternal health, allowing couples to space pregnancies and avoid unintended pregnancies. Nurses play a crucial role in educating clients about various methods, their mechanisms, efficacy, and potential side effects, ensuring the chosen method aligns with the client's medical history and lifestyle.

Natural Family Planning

Natural methods rely on identifying the fertile window. These include the Calendar (Rhythm) Method, Basal Body Temperature (BBT) method (detecting the slight temperature drop just before ovulation and rise afterward), Cervical Mucus (Billings) Method (spinnbarkeit sign), and the Symptothermal method. These methods require high motivation and regular menstrual cycles.

Hormonal Contraceptives

• Combined Oral Contraceptives (COCs): Contain estrogen and progestin. They suppress ovulation, thicken cervical mucus, and thin the endometrium. Contraindications include history of thromboembolic disorders, severe hypertension, liver disease, and smoking in women over 35. Side effects include nausea, breast tenderness, and breakthrough bleeding. Clients must be taught the "ACHES" warning signs (Abdominal pain, Chest pain, Headaches, Eye problems, Severe leg pain) indicating potential cardiovascular complications.
• Progestin-Only Pills (POPs): Ideal for breastfeeding mothers as they do not suppress lactation. Must be taken at the exact same time every day.
• Injectables (e.g., DMPA): Given every 12 weeks. May cause weight gain and delayed return to fertility.
• Subdermal Implants: Provide long-acting reversible contraception (LARC) for up to 3-5 years. Side effects commonly include irregular bleeding.

Intrauterine Devices (IUDs)

IUDs can be copper-bearing (non-hormonal, causing a spermicidal local inflammatory response) or levonorgestrel-releasing (hormonal). They are highly effective LARCs. Contraindications include active pelvic inflammatory disease (PID), undiagnosed vaginal bleeding, and anatomical abnormalities of the uterus. Clients should be taught to check for the IUD string regularly. Warning signs of IUD complications are remembered by "PAINS" (Period late/pregnancy, Abdominal pain, Infection/fever, Not feeling well, String missing).

Barrier Methods

Male and female condoms provide the dual benefit of preventing pregnancy and protecting against sexually transmitted infections (STIs). Diaphragms and cervical caps must be used with spermicide and require proper fitting.

Permanent Methods

Tubal ligation (female sterilization) and vasectomy (male sterilization) are considered permanent and involve surgical interruption of the fallopian tubes or vas deferens, respectively. Detailed informed consent is paramount.