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Questions and Answers
What is the purpose of the exam described in the text?
What is the purpose of the exam described in the text?
Which sign is a preliminary labor sign caused by the settling of the fetal head into the inlet of the true pelvis?
Which sign is a preliminary labor sign caused by the settling of the fetal head into the inlet of the true pelvis?
What are the three signs of true labor?
What are the three signs of true labor?
When does the first stage of labor end?
When does the first stage of labor end?
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What occurs in the second stage of labor?
What occurs in the second stage of labor?
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Study Notes
Stages of Labor
- Effacement is the shortening and thinning of the cervical canal, which normally disappears (1-2 cm) due to longitudinal traction from the contracting uterine fundus.
- Palpation is used to determine the degree of thickness; a normal cervix is about 1 inch thick.
- Primigravida effacement occurs before dilatation, whereas multigravida may dilate before effacement.
Dilatation
- Dilatation is the enlargement of the cervical canal from a few millimeters wide to approximately 10 cm to permit passage.
- There are two reasons for dilatation:
- Uterine contractions gradually increase the diameter of the cervical canal lumen by pulling the cervix up.
- Fluid-filled membranes press against the cervix, serving as an opening wedge if intact, and the presenting part of the fetus serves as an opening wedge if ruptured.
- During dilatation, there is an increase in vaginal secretions (show).
- Cervical dilation is estimated by finger width, with 1 finger representing approximately 1.5 cm.
Vaginal Examination
- A fetal heart check and abdominal palpation for fetal position and presentation should always precede the initial vaginal examination.
- The vulva should be carefully inspected for lesions (e.g., abnormalities).
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Description
Test your knowledge of labor and delivery terminology with this quiz covering terms such as effacement and dilatation. Learn about the stages of labor and the changes that occur in the cervix during childbirth.
