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The passageway refers to the birth canal, which encompasses both the bony pelvis (pelvic inlet, midpelvis, and pelvic outlet) and the soft tissues of the cervix, vagina, and pelvic floor. The adequacy of the passageway is crucial for the fetus to descend and exit.
The passenger primarily refers to the fetus and the placenta. Key aspects of the passenger that influence labor and birth include:
The powers are the forces that expel the fetus and placenta from the uterus. These include:
Position, in this context, refers to the maternal position during labor and birth. Optimal maternal positioning can influence the progress of labor by:
The psyche relates to the mother's psychological state and emotional readiness for labor and birth. This includes:
The most common and ideal fetal presentation where the fetal head is positioned to enter the birth canal first. The fetal head is usually well-flexed, offering the smallest diameter to the pelvis.
A specific type of cephalic presentation where the fetal head is fully flexed, with the chin tucked to the chest, and the occiput (posterior part of the skull) is the presenting part. This is the most favorable presentation for vaginal delivery.
A fetal presentation where the buttocks, feet, or both are positioned to enter the mother's pelvis first. This presentation is associated with higher risks and often leads to a Cesarean section.
A type of breech presentation where the fetal buttocks present first, with both hips flexed and both knees extended (the legs are straight up towards the head).
A fetal presentation where the fetus lies horizontally across the mother's abdomen, with the shoulder as the presenting part. This is incompatible with vaginal birth and almost always requires a Cesarean section.
Engagement
When the widest part of the fetal head (biparietal diameter) enters the pelvic inlet.
Descent
The continuous downward movement of the fetus through the pelvis.
Flexion
The fetal head flexes, bringing the chin closer to the chest, presenting the smallest diameter of the head to the pelvis.
Internal Rotation
The fetal head rotates to align its longest diameter with the longest diameter of the mother's pelvis, usually from a transverse to an anteroposterior position.
Extension
The fetal head extends as it passes under the symphysis pubis, allowing the crown, brow, and face to emerge.
External Rotation (Restitution)
After the head is born, it rotates back to align with the shoulders, which are rotating internally to fit through the pelvis.
Fetal Dystocia
Fetal dystocia refers to difficult labor due to issues with the fetus, such as excessive fetal size (macrosomia), abnormal presentation (e.g., breech, transverse lie), or fetal anomalies, which can impede its passage through the birth canal.
Failure of Fetal Rotation or Incomplete Rotation
This occurs when the fetal head does not rotate adequately from a transverse to an anteroposterior position during internal rotation, or when it rotates to an unfavorable position (e.g., persistent occiput posterior, or OP). This can delay labor progression and necessitate interventions.
A type of cephalic malpresentation where the fetal head is hyperextended, causing the face to be the presenting part. The chin (mentum) is often the landmark. Vaginal delivery is possible if the chin is anterior (mentum anterior), but if posterior (mentum posterior), it often requires a Cesarean section.
A type of cephalic malpresentation where the fetal head is partially extended, with the brow (forehead) presenting to the maternal pelvis. This presents the largest fetal head diameter, making vaginal delivery very difficult or impossible. It often converts to a face or vertex presentation during labor, or requires a Cesarean section.
A fetal presentation where the buttocks, feet, or both are positioned to enter the mother's pelvis first. This presentation is associated with higher risks for both mother and fetus, including cord prolapse, head entrapment, and birth trauma. It often leads to a Cesarean section, though some types may be considered for vaginal delivery under strict criteria. Frank breech (hips flexed, knees extended) and complete breech (hips and knees flexed) are common types.
A fetal presentation where the fetus lies horizontally across the mother's abdomen, with the shoulder as the presenting part. The long axis of the fetus is perpendicular to the long axis of the mother. This is incompatible with vaginal birth and almost always requires a Cesarean section, with attempts at vaginal delivery posing high risks such as uterine rupture or cord prolapse.
External Cephalic Version (ECV)
A procedure to manually turn a fetus from an abnormal presentation (e.g., breech) to a cephalic (head-down) presentation by external abdominal pressure, typically after 36-37 weeks to facilitate vaginal birth.
Hypertonic Uterine Dysfunction
Hypertonic uterine dysfunction is characterized by frequent contractions with decreased intensity and increased uterine tone, leading to little cervical changes. This condition can cause prolonged labor, significant pain, and maternal fatigue. Treatment typically involves sedation, adequate hydration, and measures to promote relaxation.
Hypotonic Uterine Dysfunction
Hypotonic uterine dysfunction is characterized by infrequent contractions with decreased intensity, commonly occurring in the active phase of labor. Treatment involves augmentation of labor, often through the administration of oxytocics.
Precipitous Labor
Precipitous labor is characterized by rapid labor and birth, usually occurring within 3 hours from the onset of regular uterine contractions to the delivery of the baby.
According to the Bishop Score, what cervical position earns 0 points?
Posterior
According to the Bishop Score, what cervical position earns 1 point?
Intermediate
According to the Bishop Score, what cervical position earns 2 points?
Anterior
According to the Bishop Score, what cervical consistency earns 0 points?
Firm
According to the Bishop Score, what cervical consistency earns 1 point?
Intermediate
According to the Bishop Score, what cervical consistency earns 2 points?
Soft
According to the Bishop Score, what range of effacement earns 0 points?
0-30\%
According to the Bishop Score, what range of effacement earns 1 point?
31-50\%
According to the Bishop Score, what range of effacement earns 2 points?
51-80\%
According to the Bishop Score, what range of effacement earns 3 points?
>80\%
According to the Bishop Score, what cervical dilation earns 0 points?
0 cm
According to the Bishop Score, what cervical dilation earns 1 point?
1-2 cm
According to the Bishop Score, what cervical dilation earns 2 points?
3-4 cm
According to the Bishop Score, what cervical dilation earns 3 points?
>5 cm
According to the Bishop Score, what fetal station earns 0 points?
-3
According to the Bishop Score, what fetal station earns 1 point?
-2
According to the Bishop Score, what fetal station earns 2 points?
-1, 0
According to the Bishop Score, what fetal station earns 3 points?
+1, +2
Define induction
Initiating labor artificially
Define augmentation
Strengthening labor that began spontaneously but is ineffective