What is the process of pregnancy from fertilization until birth?
What are the signs of pregnancy?
What are the areas of concerns before and during pregnancy? Examples: Rubella, Hypertension
What is the labor and birth process (stages)?
What constitutes an APGAR score? Example: A score of 8.
What are the basic nutritional needs during pregnancy? (Calories, calcium, iron…)
What are harmful biological agents for the mother?
What are harmful chemical agents for the mother?
What other concerns are there during pregnancy? Example: diabetes
MORE SPECIFIC QUESTIONS
What is the correct order for pregnancy-related events?
What are the chemical risks for the mother and what do they cause?
Topics to discuss with women planning to become pregnant.
Components of the APGAR score and levels constituting the score.
Ways a newborn could have a score of 7.
What constitutes TORCH? (Refer to Table 16-6)
INTRODUCTION TO THE PRENATAL PERIOD
The process of conception, pregnancy, and birth is complex, involving multiple interacting factors.
The fetus develops into a viable entity during the prenatal period.
Nursing interventions take place in three periods: prenatal, intranatal, and postnatal.
The primary goal is promoting a healthy pregnancy and a healthy family system afterward.
BIOLOGY AND GENETICS
Biological events during pregnancy include:
Fertilization of the egg by sperm.
Implantation of the fertilized egg into the uterus.
Embryonic or fetal growth and development.
Development and function of the placenta.
Maternal changes associated with pregnancy.
Each gamete (egg or sperm) contains half of an individual's genetic material, leading to the formation of a new individual.
DURATION OF PREGNANCY
Full-term pregnancy duration is approximately:
9 solar months or 10 lunar months.
40 weeks of gestation.
Divided into three trimesters.
Estimating the date of delivery:
Calculate using Nägele's rule: last menstrual period + 7 days - 3 months.
ANATOMY OF PREGNANCY
Structures Involved in Conception
Fallopian tube: Pathways for eggs to travel from the ovaries to the uterus.
Uterus: Site where the fertilized egg will implant.
Endometrium: The inner lining of the uterus, thickening in preparation for implantation.
Cervix: The lower part of the uterus that opens into the vagina.
Ovary: Produces the egg.
Fimbriae: Finger-like projections that help guide the egg into the fallopian tube.
FERTILIZATION
Definition: The union of the egg (ovum) and sperm, creating a zygote.
Process:
The ovum and sperm meet in the fallopian tube about 5 hours after ovulation.
The zygote forms as the sperm penetrates the egg, preventing other sperm from fertilizing it.
IMPLANTATION
Definition: The attachment of the fertilized egg to the uterine wall.
The placenta develops, serving as an endocrine gland that secretes essential hormones.
The zygote travels down the fallopian tube for about 6 days before reaching the uterus, where it implants into the endometrium which nourishes it for the first 5 days.
Role of Progesterone: Stimulates decidua to supply nutrients for the embryo for up to 8 weeks.
FETAL GROWTH AND DEVELOPMENT
Stages:
Zygote → embryo → fetus
Physical development occurs alongside metabolic functions, requiring precise timing and sequence of events.
Congenital defects refer to abnormalities in structure or function, while genetic defects are abnormalities that occur at conception.
PLACENTAL DEVELOPMENT AND FUNCTION
The placenta originates from the integration of embryonic and decidual cells and includes chorionic and amniotic membranes that contain amniotic fluid, protecting the fetus.
It allows for maternal-fetal blood exchange but prevents direct blood mixing. Some medications and substances can cross the placenta.
Hormonal and immunologic functions: The placenta secretes hormones such as estrogen, progesterone, hCG, and hPL, maintains a non-reactive environment, and facilitates nutrient and waste elimination.
Decreased placental function can indicate labor initiation, with major concerns arising from pregnancies lasting over 42 weeks.
PRESUMPTIVE SIGNS OF PREGNANCY
Nausea / vomiting (hyperemesis), breast changes, increased urinary frequency, and a missed menstrual period (notably, nausea/vomiting occurs in up to 80% of pregnancies).
Medications: The FDA has approved Diclegis, which consists of doxylamine (an antihistamine) and pyridoxine (Vitamin B12).
Side effects: drowsiness; dietary changes and non-medical treatments are also considered.
PROBABLE SIGNS OF PREGNANCY
Physical Findings:
Enlargement of the uterus, softening of cervical tissue, bluish color of cervix/upper vagina (Chadwick sign), softening of the cervix (Goodell sign), and asymmetric, softened uterine enlargement (Piskacek sign).
Positive Test Results: Positive hCG test in maternal urine or blood and changes in skin pigmentation (chloasma and linea nigra).
POSITIVE SIGNS OF PREGNANCY
Detection of fetal heart tones via auscultation, ultrasonography, or Doppler techniques.
Visualization and palpation of fetal body parts using Leopold maneuvers and observable fetal movements.
Radiological or ultrasonographic confirmation of fetal anatomy.
ADAPTIVE CHANGES OF PREGNANCY
Urinary System Changes: Dramatic increases in glomerular filtration rate and bladder capacity.
Cardiovascular Changes: Increase in cardiac output and blood volume, with a rise in maternal heart rate.
Respiratory System: Increased tidal volume due to upward displacement of the diaphragm.
Musculoskeletal Changes: Relaxation of joints and changes in spinal curvature.
Integumentary Changes: Development of striae gravidarum, linea nigra, and chloasma.
Gastrointestinal Changes: Slower peristalsis leads to issues like constipation and heartburn.
PRECONCEPTION CARE OF WOMEN
Emphasizes the importance of preconception care as essential for better maternal and birth outcomes than traditional prenatal care, which begins later in pregnancy.
CDC Recommendations (2014): 10 recommendations geared toward improving health perceptions, ensuring that all women receive care, reducing pregnancy complication risks, and lessening disparities in pregnancy outcomes.
SAMPLE RECOMMENDATIONS FOR PRECONCEPTION CARE
Vaccinations and Supplementation: Rubella, hepatitis B, and folic acid.
Chronic Disease Management: Diabetes and hypothyroidism.
Screening: For STIs, depression, and violence.
Lifestyle Modifications: Consumption of healthy diets, cessation of smoking and drug use, maintaining a healthy weight.
RECOMMENDED WEIGHT GAIN DURING PREGNANCY
Healthy women: 25-35 lbs
Underweight (BMI < 18.5): 28-40 lbs
Overweight (BMI > 25): 15-25 lbs
Obese (BMI > 30): 11-20 lbs
Risks associated with obesity include prematurity, stillbirth, congenital anomalies, and pregnancy complications like diabetes, embolism, and preeclampsia.
LABOR AND BIRTH STAGES
Dilation Stage: From the onset of labor to full cervical dilation, subdivided into latent, active, and transition phases.
Pushing Stage: From complete dilation to birth.
Placental Stage: Birth until the delivery of the placenta.
Recovery Stage: Duration of 4 hours following childbirth involving physiological and psychological adjustments.
KEY CONCEPTS IN LABOR AND BIRTH
Dilation: Graded from 0 to 10 indicating the progress of labor.
Cervical Effacement: Mechanism of the cervix thinning during labor.
Fetal Heart Rate Monitoring: Indicates fetal health, with bradycardia classifications (HR < 110 bpm) being a concern.
Station Positioning: The position of the fetus within the birth canal marked from -5 (floating) to +5 (crowning).
TRANSITION FROM FETUS TO NEWBORN
Nursing assessments focus on protection of the infant and prevention of complications, including avoiding cold stress and observing the newborn.
APGAR Scoring System: Assesses the infant's condition at 1 and 5 minutes after birth, using a scale from 1 to 10 based on criteria such as heart rate, respiration, muscle tone, reflex response, and skin color.
Factors affecting APGAR scores: Include gender, race, culture, and genetics.
KEY FACTORS IN INFANT HEALTH
Gender Differences: Males tend to be born larger, impacting rates of spontaneous abortions.
Racial Considerations: Influences on congenital diseases and infant mortality rates.
Socioeconomic Status: Significantly impacts overall infant health outcomes.
Genetic Considerations: Conditions such as Down syndrome and triggers for spontaneous abortions.
BIOLOGICAL AGENTS IMPACTING PREGNANCY
Infections: Can adversely affect fetal growth and development, contingent upon maternal infection timing.
Safeguarding through Vaccines: Tetanus, diphtheria, and influenza vaccines are recommended during pregnancy, whereas vaccines containing live viruses (e.g., MMR) are contraindicated.
TORCH Screen: Includes testing for toxoplasmosis, hepatitis B, rubella, cytomegalovirus, and herpes simplex.
SPECIFIC INFECTIONS IN PREGNANCY
Toxoplasmosis: Risk factors include undercooked meat and cat feces. Fetal consequences could involve CNS damage.
Syphilis: Transmitted sexually; fetal effects range from stillbirth to skin lesions. Prevention includes screening.
Rubella: Vaccination ideally before pregnancy; fetal risks include deafness and heart defects.
Cytomegalovirus: Common yet can lead to hearing loss and developmental delay in the fetus.
Herpes Simplex Virus: Severe implications if contracted late in pregnancy; vaginal birth contraindicated if lesions are present.
Zika Virus: Important for regions where this disease is endemic; correlates with microcephaly in infants.
BACTERIAL AND YEAST INFECTIONS
Chlamydia: Can lead to premature labor or low birth weight.
Gonococcus: May induce neonatal ophthalmia if left untreated.
Group B Streptococcus: Requires screening in late pregnancy to prevent complications.
Candida Albicans: Known to cause thrush in neonates; may need treatment for mothers.
HIV AND HEPATITIS IN PREGNANCY
HIV: High-risk maternal groups should be screened for HIV, considering implications for the mother and fetus.
Hepatitis B: High-risk screening and immunizations crucial for maternal health.
FEVER AND PREGNANCY
Prolonged Fever Risks: Correlated with miscarriage and preterm birth; avoid high-temperature environments like saunas.
Vaccinations: Recommended to prevent influenza among pregnant women.
COVID-19 IN PREGNANCY
Higher likelihood of complications in pregnant individuals diagnosed with COVID-19, including risks of preterm delivery and morbidity.
DIABETES IN PREGNANCY
Increased maternal insulin needs monitored through pregnancy.
Implications for the fetus include increased congenital anomalies and risks for neonatal complications.
HEART DISEASE, HYPERTENSION, AND RH INCOMPATIBILITY
Maternal complications associated with heart disease and hypertension can lead to fetal risks.
Rh Incompatibility Mechanism: Rh-negative mothers can form antibodies against Rh-positive fetal blood cells, potentially leading to fetal anemia or demise.
CHEMICAL AGENTS AND MEDICATIONS
Risks associated with antibiotics and anticonvulsants are notable. Specific substances such as phenobarbital can induce addiction in newborns.
Substance Abuse Risks: Including alcohol and narcotics present significant concerns.
Over-the-Counter Medications: Caution advised against excessive use of acetaminophen or ibuprofen.
CHEMICAL AGENTS: ALCOHOL, NICOTINE, AND CAFFEINE
Alcohol: Leads to fetal alcohol syndrome; impact on child’s future alcohol dependency.
Nicotine: Linked to adverse pregnancy outcomes such as low birth weight and respiratory problems in the infant.
Caffeine: High intake discouraged; impacts during pregnancy remain unclear, though moderation is recommended.
ENVIRONMENTAL PROCESSES AND MECHANICAL FORCES
Teratogens can result in birth defects or spontaneous abortions; various risk factors necessitate the use of diagnostic tools such as ultrasonography.
Social Factors: Affect prenatal care availability, economic conditions, culture, and governmental policies.
CULTURAL IMPACT ON HEALTH
Cultural diversity influences childbearing practices. Understanding different cultural values can enhance care delivery.
NURSING APPLICATION
Assessment of mother, fetus, and family dynamics is critical.
Education and advocacy for mothers, ensuring they have resources and support.
SCENARIOS IN NURSING PRACTICE
Case Study of Mae Thao: A nurse educating a multicultural clientele about healthy pregnancies and interventions.
SAMPLE QUIZ QUESTIONS AND ANSWERS
1: Presumptive signs of pregnancy include nausea, missed period, and urinary frequency (Correct answers: A, B, C).