A laboring patient asks the nurse, "Why does the physician want to use an intrauterine pressure catheter (IUPC) during my labor?" The nurse would accurately explain that the best rationale for using an IUPC is:
1. The IUPC can be used throughout the birth process.
2. A tocodynamometer is subject to artifacts.
3. The IUPC provides more accurate data than does the tocodynamometer.
4. The tocodynamometer can be used only after the cervix is dilated 2 cm.
3
Rationale 1: The IUPC is inserted only after membranes have ruptured.
Rationale 2: The tocodynamometer, if used correctly, is not subject to artifact.
Rationale 3: The IUPC, inserted only after membranes have ruptured, provides accurate measurement of uterine contraction intensity. The tocodynamometer does not accurately record the intensity of the uterine contraction.
Rationale 4: The tocodynamometer can be used at any time; it is not related to cervix dilatation.
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