Week 2 Learning outcomes-study aid Flashcards
- Discuss signs and symptoms of impending labor.
A few weeks before labor, changes occur that indicate the woman’s body is preparing for the onset of labor. These changes are also referred to as premonitory signs of labor.
● Lightening: This refers to the descent of the fetus into the true pelvis approximately 2 weeks before term in first-time pregnancies. The woman may feel she can breathe more easily but often experiences urinary frequency at this stage from increased bladder pressure. In subsequent pregnancies, this may not occur until labor begins.
● Braxton-Hicks: These contractions are irregular UCs that do not result in cervical change and are associated with “false labor.” Braxton-Hicks contractions are usually not painful, don’t happen at regular intervals, don’t get closer together, may stop with a change in activity or position, and do not feel stronger over time. These contractions begin to coordinate the many muscle layers of the uterus to perform when true labor begins. True labor is characterized by regular uterine contractions that result in progressive dilation and effacement of the cervix and fetal descent into the pelvis
● Cervical changes. The cervix ripens, becomes soft, and may become partially effaced and begin to dilate. The woman may lose her mucous plug or have a change in discharge.
● Nesting. Some women experience a burst of energy or feel the need to put everything in order, which is sometimes referred to as nesting.
● Less commonly, some women experience a 1- to 3-pound weight loss and others experience diarrhea, nausea, or indigestion preceding labor.
● The woman may experience low backache and sacroiliac discomfort due in part to the relaxation of the pelvic joints.
● The woman may experience a brownish or blood-tinged cervical mucus discharge referred to as bloody show.
- Distinguish between true and false labor.
True labor contractions occur at regular intervals and increase in frequency, duration, and intensity
● True labor contractions bring about changes in cervical effacement and dilation.
● False labor is characterized by irregular contractions with little or no cervical change
- Differentiate among the four stages of labor and typical maternal behaviors during each stage.
Labor and birth is divided into four stages:
● The first stage begins with onset of labor and ends with complete cervical dilation.
● The second stage begins with complete dilation of cervix and ends with delivery of the baby.
● The third stage begins after delivery of the baby and ends with delivery of the placenta.
● The fourth stage begins after delivery of the placenta and is completed 4 hours later; it is the immediate postpartum period
First stage more detailed
The first stage of labor is defined as the progression of cervical changes. This stage is divided into three phases: latent phase, active phase, and transition. Characteristics of the first stage of labor are as follows:
● It begins with onset of true labor and ends with complete cervical dilation (10 cm) and complete effacement (100%).
● Stage 1 is the longest stage, typically lasting 12 hours for primigravidas and 8 hours for multigravidas.
● There are normally tremendous variations in lengths of labor
● The bag of waters or fetal membranes usually ruptures during this stage.
● The woman’s cardiac output increases.
● The woman’s pulse may increase.
● Gastrointestinal motility decreases, which leads to increase in gastric emptying time (Mattson & Smith, 2011).
● The woman experiences pain associated with UCs that result in the dilation and effacement of the cervix.
● The first stage has three phases: the latent, active, and transition phases
-Latent phase- Characteristics of this phase are:
● Cervical dilation from 0 to 4 cm with effacement from 0% to 40%.
● Mild intensity contractions occur every 5 to 10 minutes, lasting 30 to 45 seconds. Women often describe them as feeling like strong menstrual cramps.
Women in this phase are usually both excited and apprehensive about the start of labor. They are talkative and able to relax with the contractions.
-Active phase behaviors- Women in this phase may have decreased energy and experience fatigue. They become more serious and turn attention to internal sensations. As labor progresses, most women turn inward
-Transition phase- In transition, women are easily discouraged and irritable, and may be overwhelmed and panicky. They often feel and act out of control
Second stage - more detail
The woman enters the second stage of labor when cervical dilation is complete (10 cm) This stage ends with the birth of the baby. Women in the second stage may have a burst of energy, be more focused, and feel like they can actively participate in facilitating birth with active pushing efforts. Phases of the second stage of labor are as follows:
● Latent or resting phase is characterized by a period of rest and relative calm. The urge to bear down is usually not well-established, particularly for women with regional analgesia/anesthesia. The fetus can passively descend in the pelvis during this time without maternal expulsive efforts.
● Descent or active phase is characterized by increasing intensity of uterine contractions and strong urges to bear down with the activation of Ferguson’s reflex. During this phase, bearing-down efforts are most effective for promoting birth.
● Physiologic processes of the second stage of labor are the normal bodily function by which the fetus traverses the pelvic outlet and is expelled from the uterus through the force of strong uterine contractions, voluntary and involuntary bearing down, and stretching of the soft tissues of the female reproductive tract. The process involves numerous hemodynamic changes that may affect the reproductive, cardiac, respiratory, gastrointestinal, and renal systems. Changes in maternal physiology during the second stage of labor may also be influenced by maternal position and energy level, pain, and hydration.
Characteristics of this stage include the following:
● Typically lasts 50 minutes for primigravidas and 20 minutes for multigravidas, although a second stage of several hours is normal.
● Woman may feel an intense urge to push or bear down when the baby reaches the pelvic floor.
● Studies have shown that bearing down in the second stage is less tiring and more effective when started after the woman has the urge to do so rather than before. Nulliparous women with epidurals who delayed their efforts until feeling the urge to push (Ferguson’s reflex) had 27% shorter pushing time. This decreased maternal fatigue, provided increased maternal satisfaction in the birth experience, and allowed women to fully participate in postpartum activities
Third stage more detail
The third stage of labor begins immediately after the delivery of the fetus and involves separation and expulsion of the placenta and membranes. As the infant is born, the uterus spontaneously contracts around its diminishing contents. This sudden decrease in uterine size is accompanied by a decrease around placental implantation. This results in the decidual layer separating from the uterine wall. Placental separation typically occurs within a few minutes to less than a half hour after delivery. Once the placenta separates from the wall of the uterus, the uterus continues to contract until the placenta is expelled . This process typically takes 5 to 30 minutes post-delivery of the baby and occurs spontaneously. Signs that signify the impending delivery of the placenta include:
● Upward rising of the uterus into a ball shape
● Lengthening of the umbilical cord at the introitus
● Sudden gush of blood from the vagina
Active management of the third stage of labor (AMTSL) includes uterotonic drugs (oxytocin is the gold standard), controlled cord traction, and late cord clamping performed 1-3 minutes after delivery. These interventions decrease postpartum hemorrhage (PPH) and cause uterine contractions and placenta expulsion. The placenta, membranes, and cord are examined by the care provider for completeness and anomalies.
Fourth stage more detail
The fourth stage begins after delivery of the placenta and typically ends within 4 hours or with the stabilization of the mother. After the placenta delivers, the primary mechanism by which hemostasis is achieved at the placental site is vasoconstriction produced by a well-contracted myometrium. During this stage, the nurse is caring for both the woman and her newborn child (see Table 8–1). This stage also begins the postpartum period.
An important goal during the fourth stage is the newborn-family attachment. This is promoted by allowing early contact with the newborn and encouragement of eye contact and touch. The baby is placed skin-to-skin on the mother and covered with a warm blanket. Positive maternal bonding behaviors include making eye contact, touching and talking to the baby, smiling and cuddling the newborn, and similar actions. This is often the best time to institute breastfeeding. The newborn may remain in the labor and delivery room with the family for the immediate recovery period.
- Identify the three phases of the first stage of labor and typical maternal behaviors during each phase.
Latent phase
-Latent phase- Characteristics of this phase are:
● Cervical dilation from 0 to 4 cm with effacement from 0% to 40%.
● Mild intensity contractions occur every 5 to 10 minutes, lasting 30 to 45 seconds. Women often describe them as feeling like strong menstrual cramps.
The latent phase is the early and slower part of labor with an average length of 9 hours for primiparous and 5 hours for multiparous women. Women in this phase are usually both excited and apprehensive about the start of labor. They are talkative and able to relax with the contractions. Many women choose to stay home during this phase, although some are admitted to the birth center.
Active phase
The active phase (dilation to 7 cm) of labor averages three to six hours. It is typically shorter for multigravidas (see Table 8–1). Women in this phase may have decreased energy and experience fatigue. They become more serious and turn attention to internal sensations. As labor progresses, most women turn inward. Characteristics of this phase include the following:
● The consortium on safe labor reviewed more than 19,000 births and determined that nulliparous and parous woman dilate at a similar rate between 4-6 cm, much slower than Friedman (1955) determined in the 1950s: “6 is the new 4” (Zhang et al., 2010). The older standard was cervical dilation progression from 4 cm to 7 cm with effacement of 40% to 80%.
● Fetal descent continues.
● Contractions become more intense, occurring every 2 to 5 minutes with duration of 45 to 60 seconds.
● Discomfort increases; this is typically when the woman comes to the birth center or hospital if she has not done so already.
Transition phase
The transition phase (dilation to 10 cm), is usually the most difficult but shortest of the first stages of labor (see Table 8–1). In transition, women are easily discouraged and irritable, and may be overwhelmed and panicky. They often feel and act out of control. Characteristics of this phase are:
● Cervical dilation from 8 to 10 cm with complete (100%) effacement
● Intense contractions every 1 to 2 minutes lasting 60 to 90 seconds
● Exhaustion and increased difficulty concentrating
● Increase of bloody show
● Nausea and vomiting
● Backache: Woman complains of back pressure, hand goes over hip, rubbing and pressing on area.
● Trembling
● Diaphoresis, especially upper lip and facial area
● May have a strong urge to bear down or push, more vocal with primal noises and facial expressions.
- Identify pharmacological and non-pharmacological methods to promote comfort during labor
and birth. Include the following pharmacological methods: systemic medications (narcotics),
epidural, spinal, general, and local anesthesia. For non-pharmacological methods include:
effleurage, massage, lighting, soothing sounds, breathing patterns, birth ball, etc. Identify
which methods are the safest.
Nonpharmacological-
Non pharmacological
● Effleurage is cutaneous stimulation by lightly stroking the abdomen in rhythm with breathing during contractions. Another form of cutaneous stimulation is back massage and/or counter pressure to the sacral area by another. Counter pressure is exerted to the sacral area with the heel of the hand or fist to relieve the sensation of intense pain in the back caused by internal pressure of the fetal head. This increased internal pressure by the fetal head is often associated with the posterior position of the fetus during labor.
● Massage: Multiple studies have shown massage to decrease pain and promote relaxation, which in turn promotes labor progress. A quiet, soothing voice encouraging the woman to imagine a safe place can assist in relaxation. This used in conjunction with aromatherapy has proven to enhance relaxation in laboring women, allowing women to have better control of labor.
Lighting-
Soothing sounds-● Music therapy: Music calms the spirit and decreases stress and distress by diverting attention from the pain receptors and promoting relaxation.
● Relaxation and breathing techniques: Varied breathing patterns that promote relaxation and avoidance of pushing before complete cervical dilation.Most women are taught to take a deep breath at the beginning of the contraction to signal the onset of the contraction and then to breathe slowly during the contraction. As labor pain increases, the woman may need to breathe in a more rapid and shallow manner. On occasion, a woman will experience hyperventilation from this type of breathing. Symptoms are related to respiratory alkalosis and include tingling of the fingers or circumoral numbness, lightheadedness, or dizziness. This undesirable side effect can be eliminated by having the woman breathe into a bag or cupped hands. This causes her to rebreathe carbon dioxide and reverses the respiratory alkalosis. Discuss with the woman and her support team how they plan on managing labor. This will stimulate conversation, facilitate a plan of care to assist them in pain management, and give an opportunity to teach and or support them as needed.
● Birthing ball: This ball (65-cm) originated in physical therapy programs but has been used successfully in the labor suite. It facilitates an upright position, opens the pelvis, and allows the woman to roll or bounce as she deems necessary to manage her contractions and pain.
Hydrotherapy
Self hypnosis
Accupuncture
Aromatherapy
Thermal stimulation-application of warmth or cold
Mental stimulation - imagry, focal points
Support person
Pharmacological
pharmacological-
The use of opioids in labor is common. Advantages include availability, ease of administration, and cost. Depending on the dose, route of administration, and stage of labor parenteral analgesia does not illuminate pain but causes a blunting effect, leading to a decrease in sensation of pain and inducing somnolence (Burke, 2014). Opioids cross the placenta and can cause neonatal respiratory depression.
self-administered nitrous oxide for labor analgesia -A recent published review concludes nitrous oxide analgesia is safe for mothers, neonates, and those who care for women during childbirth (Rooks, 2011). In the context of obstetric analgesia, “nitrous oxide” usually refers to a half-and-half combination of oxygen and nitrous oxide gas, called by the trade name “Nitronox.” It is self-administered by the laboring woman using a mouth tube or face mask when she determines that she needs it, about a minute before she anticipates the onset of a strong contraction until the pain eases. Its use can be started and stopped at any point during labor according to the woman’s needs and preferences. It takes effect in about 50 seconds after the first breath and the effect is transient—essentially gone when no longer needed. It is simple to administer and does not interfere with the release and function of endogenous oxytocin, and has no adverse effects on the normal physiology and progress of labor. This analgesia may be of help for women who want to have an unmedicated birth but may need help at some point during labor and want to use a method that is under their control
Epidural anesthesia -Epidural labor analgesia involves the placement of a catheter and injection of a local anesthetic or analgesic agent or both into the epidural space, typically in the lumbar region. Partial loss of sensation may occur.
Morphine sulfate Opioid Respiratory depression Cautious use in 2nd stage.
Butorphanol (Stadol) 2–4 mg IM 0.5–2 mg IV Nalbuphine (Nubain) 10 mg IM or IV-
Opioid agonist–antagonist
No respiratory depression in woman or neonate
Check maternal history for drug abuse. Do not give to drug dependent woman due to possible precipitation of sudden withdrawal response in woman and baby. Monitor effective response.
Sublimaze (Fentanyl) 50–100 mg IM 25–50 mg IM May be used in conjunction with regional anesthesia
Short acting opioid antagonist Crosses the placenta rapidly
Synthetic opioid
FHR changes Hypotension Maternal/fetal/neonatal CNS depression Respiratory depression
Monitor for side effects such as sedation, nausea, vomiting, itching. Monitor respiratory rate and effort.
Types of anesthesia-
LOCAL: Anesthetic injected into perineum at episiotomy site 2nd stage
REGIONAL: Pudendal Block: Anesthetic injected in the pudendal nerve (close to the ischial spines) via needle guide known as “trumpet”-2nd stage
Epidural Block: Anesthetic injected in the epidural space: Located outside the dura mater between the dura and spinal canal via an epidural catheter–first and or second stage of labor
Spinal Block: Anesthetic injected in the subarachnoid space-2nd stage
GENERAL ANESTHESIA: Use of IV injection and/or inhalation of anesthetic agents that render the woman unconscious.-usually used in emergency c-section
- Discuss the physiological and psychological changes that occur in the postpartum woman in the
immediate postpartum period.
Uterus
After delivery of the placenta, the uterus begins the process of involution by which it returns to its nearly prepregnant size, shape, and location and the placental site heals. This occurs through uterine contractions, atrophy of the uterine muscle, and a decrease in the size of uterine cells. Involution of the uterus takes between 6 and 8 weeks postdelivery.Multiparous women or women who are breastfeeding may experience “afterpains” caused by strong intermittent uterine contractions during the first few postpartum days. Afterpains are moderate to severe cramp-like pains related to the uterus working to remain contracted and/or the increase of oxytocin released in response to infant suckling. The intensity of afterpains will typically decrease after the third postpartum day .. The uterus must be contracted during the postpartum period to decrease the risk of postpartum hemorrhage. The contracted uterine muscle compresses the open vessels at the placental site and decreases the amount of blood loss.
Endometrium
The endometrium, the mucous membrane that lines the uterus, undergoes exfoliation and regeneration after the birth of the placenta through necrosis of the superficial layer of the decidua and regeneration of the decidua basalis into endometrial tissue. Lochia is a bloody discharge from the uterus that contains red blood cells, sloughed off decidual tissue, epithelial cells, and bacteria (Cunningham et al., 2014). The placental site heals by exfoliation, which involves the sloughing of necrotic endometrial tissue and the regeneration of the endometrium at the placental site . This process prevents scarring of the endometrial tissue (James, 2014). Lochia undergoes changes that reflect the healing stages of the uterine placental site (Table 12–2). Uterine contractions constrict the vessels around the placental site and help decrease blood loss.
Lochia
~Lochia rubra Days 1–3 Bloody with small clots
Normal-Moderate to scant amount Increased flow on standing or breastfeeding Fleshy odor
deviations from normal- Large clots Heavy amount; saturates pad within 1 hour (sign of possible hemorrhage), excessively heavy, saturates a pad in 15 minutes Foul odor (sign of infection) Placental fragments
~Lochia serosa Days 4–10
normal-Pink or brown color Scant amount Increased flow during physical activity Fleshy odor
Deviations from normal-Continuation of rubra stage after day 4 Heavy amount; saturates pad within 1 hour (sign of possible hemorrhage), excessively heavy; saturates pad within 15 minutes Foul odor (sign of infection)
~Lochia alba Day 10
normal-Yellow to white in color Scant amount Fleshy odor
Deviations from normal-Bright red bleeding, saturates pad within 1 hour (sign of possible late postpartum hemorrhage) Foul odor (sign of infection)