Labor and Birth DSG 2023

LABOR AND BIRTH

Lecturer: Assoc. Prof. Dr. Dilek Sarpkaya GüderInstitution: NEU, Nursing Faculty

Content Overview:

  • Onset of Labor: Exploring the triggers and implications of labor onset.

  • Maternal Signs of Approaching Labor: Recognizing early indicators of labor.

  • The Three Ps of Labor and Delivery: In-depth analysis of essential factors in childbirth.

  • Stages of Labor: Detailed breakdown of labor phases and maternal-fetal dynamics.

  • Birth: Understanding the birth process and immediate postpartum care.

Labor:

Labor typically begins between 38 and 42 weeks of gestation, marking the culmination of pregnancy. It is characterized by regular uterine contractions and progressive cervical dilation. Throughout this period, various physiological and hormonal changes occur to prepare both the mother and the fetus for childbirth.

Possible Causes of the Onset of Labor:

Maternal Factor Theories:

  • Uterine Muscle Stretching: As the pregnancy progresses, the stretching of uterine muscles leads to the release of prostaglandins, which play a crucial role in initiating contractions.

  • Ferguson Reflex: Increased pressure on the cervix stimulates the Ferguson reflex, resulting in the release of oxytocin from the posterior pituitary gland, which further enhances uterine contractions.

Oxytocin Dynamics:

Oxytocin levels rise gradually during pregnancy, peaking during the second stage of labor. This hormone facilitates uterine contractions through its complex interactions with calcium and other neurotransmitters, enhancing muscle contractions.

Hormonal Changes:

The shift in the estrogen/progesterone ratio plays a significant role; decreased levels of progesterone allow increased levels of estrogen, which promotes uterine contractions.

Fetal Factor Theories:

  • Placental Aging: As the placenta ages, it triggers the initiation of contractions to facilitate labor.

Role of Fetal Cortisol:

Fetal cortisol production increases towards the end of gestation, contributing to labor initiation. It reduces maternal progesterone levels while simultaneously boosting prostaglandin production, stimulating uterine contractions. Notably, anencephalic fetuses, which lack significant brain structures, often experience prolonged gestation due to disruptions in normal hormonal feedback loops.

Prostaglandin Production:

Prostaglandins, produced by fetal membranes and the decidua, are essential for stimulating contractions and ripening the cervix in preparation for labor.

Maternal Signs of Approaching Labor:

  • Lightening: This occurs typically around the 38th week of pregnancy, marking the descent of the fetus into the pelvic cavity, which can lead to changes in the abdomen’s shape and increased pressure on the bladder.

  • Rupture of Membranes: Known as "water breaking," this may occur spontaneously or may be induced; this sign indicates that labor may begin shortly.

  • Uterine Contractions: These contractions become more frequent and intense as labor approaches, aiding in the process of cervical thinning and dilation.

  • Bloody Show: The presence of blood-tinged cervical mucus indicates cervical dilation and effacement is occurring visibly and can signal the imminent onset of labor.

Uterine Contractions Cycle:

The cycle includes a rhythm of contraction and relaxation. Assessing the patterns of contractions is critical for determining labor progression and fetal well-being.

True vs. False Labor:

  • True Labor: Results in cervical changes and contractions that progressively intensify, leading toward delivery.

  • False Labor: Characterized by irregular contractions that do not result in cervical change and may diminish with rest or change in activity.

Braxton Hicks Contractions:

These are irregular contractions experienced by many expectant mothers as they approach their due date. They are often referred to as "practice contractions" and do not signify the onset of true labor.

The Three Ps of Labor and Delivery:

  • Power: Refers to the forces expelling the fetus, including primary power from involuntary contractions and secondary power from the mother’s voluntary pushing efforts.

  • Passage: The maternal structure through which the fetus must navigate during birth, including the shape and size of the pelvis.

  • Passenger: The fetus itself, whose presentation and position can significantly affect labor and delivery outcomes.

Stages of Labor Overview:

  1. First Stage: Begins with the onset of contractions and lasts until the cervix is fully dilated (6-10 cm).

  2. Second Stage: Involves the actual delivery of the baby after full dilation, focusing on effective pushing techniques.

  3. Third Stage: Pertains to the delivery of the placenta about 5-10 minutes after baby birth.

  4. Fourth Stage: Represents the recovery period for the mother following childbirth, focusing on maternal-fetal bonding and monitoring for complications.

Effective Pushing Techniques:

  • Closed Glottis Method: Involves taking a deep breath and pushing multiple times during contractions, though it may have risks relating to fetal stress and reduced blood flow.

  • Open Glottis Method: Encourages natural, instinctual pushing rhythms, allowing better control and reduced stress on the fetus.

Risks and Benefits Related to Pushing Techniques:

Understanding the implications of each method is critical for ensuring maternal and fetal safety. Registered nurses and midwives should be equipped to provide education on the most effective and safest methods based on individual circumstances.