Control prenatal - ENARM

Control Prenatal: Importancia y Recomendaciones

Definición y Objetivos del Control Prenatal

• El control prenatal es fundamental para vigilar la evolución del embarazo, detectar riesgos y complicaciones, así como preparar a la futura madre para el parto y la crianza.

• Se recomienda que una embarazada tenga al menos cinco consultas durante el embarazo, enfocándose en prevención, tamizaje, diagnóstico y evaluación de factores de riesgo.

Cronograma de Consultas Prenatales

• La primera consulta debe realizarse antes de las 13 semanas; las siguientes son entre las 14-24 semanas, 25-28 semanas, 29-34 semanas y finalmente entre las 35-40 semanas.

Suplementos Vitamínicos Recomendados

• Es crucial que las embarazadas consuman ácido fólico (400 microgramos/día), comenzando tres meses antes del embarazo para reducir defectos del tubo neural hasta un 93%.

• Pacientes con antecedentes familiares o condiciones específicas deben aumentar su ingesta a 5 miligramos/día debido a mayor riesgo de defectos.

Dieta y Consumo Alimenticio

• Se aconseja consumir omega 3 mediante pescado o mariscos (2 porciones/semana) para disminuir el riesgo de parto pretérmino entre un 21% a un 33%.

• Las mujeres embarazadas deben consumir calcio (1 gramo/día), ya que esto puede reducir el riesgo de hipertensión gestacional en un 35% y preeclampsia en un 55%.

Líquidos e Ingesta General

• Se recomienda una ingesta total diaria de líquidos de aproximadamente 3.1 litros; solo agua debería ser alrededor de 2.3 litros.

• Limitar bebidas carbonatadas con alto contenido azucarado es esencial para evitar fenómenos diabéticos durante el embarazo.

Signos y Síntomas de Alarma

Key Health Considerations During Pregnancy

Symptoms and Warning Signs

• Sudden symptoms such as tinnitus, blurred vision, nausea, and decreased fetal movements can indicate serious issues; a decrease in fetal movement is linked to malformations in up to 30% of cases.

• Persistent dyspnea and frequent urination are common; urinary tract infections are prevalent during pregnancy, necessitating routine urine tests.

• Abnormal contractions and abdominal pain require immediate medical attention; exercise like walking or swimming is beneficial for pregnant women.

Safety Measures

• Proper seatbelt use is crucial for protecting both mother and baby during car accidents; the shoulder strap should cross over the collarbone and between the breasts while the lap belt sits on the pelvic bones.

Vaccination Guidelines

• Pregnant women should not avoid vaccinations; certain vaccines like Tdap (for tetanus, diphtheria, pertussis) are recommended after 20 weeks of gestation.

• The trivalent inactivated influenza vaccine can be administered intramuscularly or intradermally. Hepatitis B vaccination is advised for those with risk factors such as multiple sexual partners or a history of STIs.

Contraindicated Vaccines

• Vaccines contraindicated during pregnancy include measles-mumps-rubella (MMR), varicella, polio, yellow fever, rotavirus, and BCG.

Preventive Measures Against Sensitization

• Early prenatal visits (before 13 weeks gestation) should include blood type determination to detect Rh sensitization risks.

• Anti-D immunoglobulin prophylaxis is offered to Rh-negative mothers who have not been sensitized to prevent alloimmunization.

Postpartum Care Considerations

• Women at risk for postpartum depression include those with previous mental health issues or low social support. Edinburgh Scale screening helps identify those needing further evaluation.

Oral Health During Pregnancy

• Approximately 30% of pregnant women experience periodontal disease which correlates with preterm birth and low birth weight. A diet low in sugars and regular dental care are recommended.

Oral Health Education for Pregnant Women

Importance of Oral Hygiene

• Pregnant women should receive oral health education, emphasizing the need to brush teeth three times a day or at least between meals.

• Common oral issues during pregnancy include gingivitis and pregnancy granuloma, also known as "pool" or "gravitaron."

Use of Chlorhexidine

• A 0.12% chlorhexidine solution is recommended to prevent the progression of oral diseases.

Screening for Specific Diseases in Pregnancy

Initial Laboratory Tests

• During the first prenatal visit, essential laboratory tests should be requested, including fasting glucose levels and complete blood count.

• Increased glomerular filtration rate during pregnancy may lead to glucosuria with normal blood glucose levels; creatinine levels typically decrease.

HIV and Other Infections Testing

• It’s crucial to assess risk factors for HIV infection and conduct rapid testing for patients at risk.

• Additional tests include screening for Treponema pallidum (syphilis), hepatitis A, B, and C serology.

Diabetes Screening Protocol

Early Detection of Gestational Diabetes

• Fasting glucose tests are critical before 13 weeks gestation; values above 126 mg/dL indicate pregestational diabetes.

• If fasting glucose is between 92 and 126 mg/dL, further testing such as an oral glucose tolerance test (OGTT) is necessary.

Follow-Up Based on Risk Factors

• For women with low-risk factors showing fasting glucose below 92 mg/dL, regular prenatal consultations can continue without additional testing.

• High-risk women will undergo either a one-step or two-step screening process based on initial results.

Understanding One-Step vs. Two-Step Glucose Testing

Testing Procedures Explained

• The one-step test involves administering a 75g glucose load after an overnight fast; abnormal results confirm gestational diabetes diagnosis.

• The two-step method starts with a 50g load followed by a second test if initial results exceed certain thresholds (140 mg/dL).

Clinical Guidelines Reference

• Diagnosis requires two abnormal values in the two-step approach versus just one in the one-step method; both tests are conducted between weeks 24 to 28 due to hormonal influences.

Monitoring Hypertensive Disorders in Pregnancy

Blood Pressure Management

• Maintaining systolic blood pressure between 115–120 mmHg and diastolic between 65–80 mmHg is vital during pregnancy.

Early Detection of Preeclampsia

Hypertensive Disorders in Pregnancy: Key Insights

Importance of Urine Testing

• In prenatal visits, a 24-hour urine test is crucial if reactive strips indicate protein presence, correlating with 0.3 grams of protein.

Factors Associated with Hypertensive Disorders

• Up to 90% of pregnant women experience dilation of the collecting system and reduced peristalsis in the ureters and bladder, increasing bacterial colonization risk.

Screening for Asymptomatic Bacteriuria

• Asymptomatic bacteriuria screening is recommended between 12 to 16 weeks gestation; reactive strip tests are not advised due to low sensitivity.

Follow-Up Testing Recommendations

• General urine tests should be conducted at 18-20 weeks and again at 32-34 weeks. Treatment for asymptomatic bacteriuria should last 4 to 7 days to prevent preterm labor and pyelonephritis.

Individualized Antibiotic Therapy

• The specific antibiotic treatment for asymptomatic bacteriuria is individualized based on patient tolerance and sensitivity, particularly regarding beta-lactams.

Risk Factors for Preterm Labor

Identifying Risk Factors During Initial Consultation

• The first consultation must include procedures to identify risk factors for preterm labor using Gonik's modified risk quantification system.

Cervical Length Assessment

• Women undergoing transvaginal ultrasound between 20-24 weeks showing cervical lengths over 25mm have only a 1% chance of preterm labor; shorter cervix increases this risk significantly.

Gestational Age Determination Techniques

Methods for Calculating Gestational Age

• The Nagel rule is commonly used: add seven days to the last menstrual period (LMP), plus one year minus three months.

Considerations Affecting Measurement Accuracy

• Conditions like uterine fibroids or obesity can distort fundal height measurements, making early ultrasounds more reliable than LMP calculations.

Prevention and Management of Preeclampsia

Blood Pressure Monitoring in Prenatal Visits

• Measuring blood pressure during the first prenatal visit is essential as part of screening for hypertensive disorders.

Use of Aspirin in High-Risk Patients

• Low-dose aspirin (80–120 mg before bedtime) may be given from week 12 to week 16 gestation in patients with comorbidities or diagnosed preeclampsia; timing is critical to avoid complications.

Monitoring Fetal Health

Evaluation Objectives

Fetal Heart Rate Monitoring and Perinatal Care

Importance of Fetal Heart Rate Monitoring

• The primary goal is to prevent fetal death and minimize perinatal morbidity by optimizing the timing of birth. Regular monitoring of fetal heart rate is essential as deviations can indicate potential risks.

• Normal fetal heart rate ranges from 120 to 160 beats per minute, with higher rates observed in less developed fetuses. This monitoring should occur at every prenatal visit.

Fetal Movement Patterns

• Fetuses exhibit up to 28% fewer movements, making it crucial to monitor their activity. A minimum threshold of 10 movements every two hours is recommended, especially for high-risk pregnancies starting from week 26 to term.

• In normal circumstances, fetal sleep cycles last between 20 to 40 minutes but should not exceed 90 minutes.

Stress Testing and Risk Assessment

• The non-stress test (NST) is vital for high-risk patients after week 32 of gestation or earlier if significant risk factors are present. Key recommendations include an empty bladder and a semi-Fowler's position during the test.

• The NST lasts about 20 minutes; however, it has a high false-positive rate and low predictive value, necessitating additional tests like Doppler flowmetry or biophysical profiles when placental pathology is suspected.

Anomaly Detection and Management

• Initial ultrasound assessments focus on uterine artery pulsatility indices for preeclampsia screening. Subsequent ultrasounds assess structural anomalies, particularly congenital heart defects which are prevalent in chromosomal abnormalities.

• Notably, congenital heart defects account for a significant percentage (50%-80%) of chromosomal disorders, with Tetralogy of Fallot being one of the most common conditions requiring attention.

Hemoglobin Levels and Pregnancy Complications

• Monitoring hemoglobin levels is critical; values below 11 grams necessitate treatment. Levels between 8.5 and 10.5 grams increase the risk of low birth weight and preterm labor.

• For patients with preeclampsia, beta-blockers are contraindicated; alternatives such as alpha-methyl dopa should be considered instead.

Reference Criteria in Early Pregnancy