Chapter 15 Fetal Assessment During Labor VOCAB Flashcards Preview

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Flashcards in Chapter 15 Fetal Assessment During Labor VOCAB Deck (20)
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1

Acceleration

A visually apparent, abrupt increase in FHR above the baseline rate. The peak is at least 15 beats/min above the baseline and the acceleration lasts 15 seconds or more.

2

Amnioinfusion

Infusion of room-temperature normal saline or lactated Ringer's solution through an intrauterine pressure catheter into the uterine cavity in an attempt to increase the fluid around the umbilical cord and prevent compression during uterine contractions.

3

Asphyxia

Fetal hypoxia that results in metabolic acidosis.

4

Baseline FHR

Average FHR during a 10-minute period that excludes periodic and episodic changes, periods of marked variability, and segments of the baseline that differ by more than 25 beats per minute; normal FHR baseline is 110 to 160 beats per minute.

5

Bradycardia

A baseline FHR less than 110 beats/min for 10 minutes or longer.

6

Duration

Time from the beginning of a contraction to the end of the same contraction, measured in seconds.
Early deceleration a visually apparent, gradual decrease in and return to baseline fetal heart rate Associated with contractions; caused by fetal head compression. Generally the onset, nadir, and recovery of the deceleration correspond to the beginning, peak, and end of the contraction.

7

Frequency

Time from the beginning of one contraction to the beginning of the next, measured in minutes.

8

Hypoxemia

A deficiency of oxygen in the arterial blood.

9

Hypoxia

An inadequate supply of oxygen at the cellular level that can cause metabolic acidosis.

10

Intensity

Strength of a contraction at its peak.

11

Intermittent auscultation

Listening to fetal heart sounds at periodic intervals to assess the FHR.

12

Late deceleration

A visually apparent, gradual decrease in and return to baseline fetal heart rate associated with contractions; caused by disruption of oxygen transfer. The deceleration begins after the contraction has started and the nadir of the deceleration occurs after the peak of the contraction. The deceleration usually does not return to baseline until after the contraction ends.

13

Montevideo units (MVUs)

A method to quantify intensity of labor contractions with internal uterine activity monitoring. The baseline intrauterine pressure for each contraction in a 9-minute period is subtracted from the peak pressure. The resulting net pressures (peak minus baseline) are added to calculate Montevideo units, or MVUs.

14

Nadir

The lowest point, such as the lowest pulse rate in a series.

15

Prolonged deceleration

A visually apparent decrease (may be either gradual or abrupt) in fetal heart rate of at least 15 beats/min below the baseline and lasting more than 2 minutes but less than 10 minutes.

16

Tachycardia

A baseline FHR greater than 160 beats/min for 10 minutes or longer.

17

Telemetry

Wireless transmission of electronic fetal monitoring data to a bedside or central monitor unit.

18

Uterine resting tone

Degree of uterine muscle tension when the woman is not in labor or during the interval between labor contractions.

19

Variability

Irregular waves or fluctuations in the baseline FHR of two cycles per minute or greater. There are four possible categories of variability: absent, minimal, moderate, and marked.

20

Variable deceleration

A visually apparent abrupt decrease in fetal heart rate below the baseline; caused by compression of the umbilical cord. The decrease is at least 15 beats/ min or more below the baseline, lasts at least 15 seconds, and returns to baseline in less than 2 minutes from the time of onset.