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Wiki.assessment of uterine contractions 2011
1. Assessment of Uterine
Contractions
August 2011
Inpatient Review Course
Sandy Warner RNC-OB, MSN
2. Electronic Assessment of Uterine
Contractions
Electronic assessment monitoring of
Contractions is done with:
Tocodynamometer when placed on upper portion
of uterus frequency and duration of contractions
can be determined
Intrauterine pressure catheter (IUPC) catheter
placed in uterus measures pressures in the uterus
before during and after contraction is over in
mmHg. Palpation between contractions still
necessary.
3. Timing Contractions: Frequency, Duration
& Intensity
To assess (time) frequency of UC
beginning of one contraction until beginning of
next contraction
To assess duration
from beginning of contraction until end of
contraction
To assess intensity
palpate fundus of uterus to determine firmness of
contraction
4. Tracing of Uterine Activity
frequency
Intensity
duration
Relaxation
TOCO placed on upper part of uterus to assess frequency
and duration of contractions. Palpation done to determine intensity
And relaxation.
5. Timing Contractions:
Uterine Resting Tone
To assess relaxation
Palpate fundus of uterus (between UC). Uterus should be
very relaxed (soft). If not soft, then not relaxed. Between
UC is when fetus gets blood through spiral arteries of
uterus. Resting tone palpation needs to be done with
either external or internal UC monitoring
6. Assessment – Uterine Contractions by
Palpation
Contraction Corresponds to Palpation of
Intensity Body Part
Mild Tip of nose
Moderate Chin
Strong Forehead
Place hand on fundus of uterus to assess uterine contractions. Keep hand on fundus throughout
several contractions to determine difference between relaxation and contraction increasing
in intensity to peak and then decreasing in intensity to relaxation. Use key above.
Malinowski, 1989 6
7. Intrauterine Pressure Catheter
Requires ROM More accurate due to
Pressure of direct measurement of
contractions measured intrauterine pressure
in mm Hg
Provides measurement
of strength of UC
Notation must be made
of resting tone (should
be below 20 mm Hg)
Can be re-zeroed if
baseline increases
8. Terminology for Describing Uterine
Activity
Normal
Hypotonus and Hypertonus
Multiphasic – dysfunctional
Tachysystole
10. Uterine Hypertonus
Hypertonus - insufficient relaxation between contractions.
Uterus not soft between contractions
If IUPC in place pressure between UC is ≤ 20-25 mmHg.
11. Multiphasic Contractions – (coupling or tripling)
- may be caused by over saturation of uterine oxytocin
receptor sites
12. Tachysystole
> 5 in 10 minutes contractions averaged over a 30
minute window
Always in relation to the presence or absence of
decelerations.
Applies to both spontaneous or stimulated labor
Interventions MUST be performed AND documented
Appropriate management of pitocin is essential
14. Administer Oxytocin drip as ordered by Primary Care Provider to achieve cervical
dilation and adequate contraction pattern while maintaining a normal Fetal Heart
Rate pattern.
If Tachysystole develops:
Contractions lasting > 2 minutes over a 10 minute period
or
>5 (6 or more) Contractions in 10 minutes averaged over a 30 minute period
or
Contractions occurring within 1 minute of each other over a 10 minute period
Is the FHR reassuring?
(Moderate variability and absence of recurrent late/variable decelerations)
YES NO
Category I Category II / III
(Reassuring FHR Tracing) (Indeterminate/Abnormal FHR Tracing)
Continue to observe for approximately 30 Discontinue the Oxytocin administration
minutes as long as FHR is reassuring Notify the provider and document report
Consider the following interventions: and interventions used to resolve the
Maternal position change clinical situation
IV Fluid hydration Interventions:
Increased frequency of observation Maternal position change
Document and report interventions IVF bolus
Oxygen at 10-12 Lpm
Increased frequency of observation
Did Uterine Tachysystole resolve? Document and report interventions
YES NO
Continue Decrease the Pitocin by Observe for 10-30 minutes, Pitocin
increasing ½. Continue to observe may be restarted at ½ the previous
Pitocin as for an additional 30 dose if FHR is reassuring and
ordered minutes providing the uterine activity is inadequate
FHR remains reassuring Consider IUPC placement
If uterine Tachysystole If uterine Tachysystole reoccurs,
does not resolve after 60 notify provider
minutes, notify the
provider
Hinweis der Redaktion
Decreasing or stopping pitocin and IV fluid bolus will correct