Fetal Heart Rate Monitor Review Questions #1

Variability is a function of the autonomic nervous system and therefore, may be affected by:

• Certain medications such as sedatives and analgesics

• Increased oxygen flow

• Maternal movement

According to NICHD definition, the baseline fetal heart rate is the approximate mean FHR rounded to increments of 5 bpm which is:

• Determined between contractions

• Determined after excluding periodic or episodic changes during a 10-minute segment.

• Determined during a minimum of a 30-minute segment.

The preterm fetus will have minimal variability as a result of:

• An immature autonomic nervous system.

• An immature voluntary system.

• An immature respiratory system.

Decreased blood flow to the fetus resulting in decreased oxygen delivery to the fetus may be the result of:

• IV analgesics.

• Maternal anxiety.

• Maternal hypotension.

Tags

NGSS.HS-LS1-3

Tachysystole is defined as:

• Greater than 5 contractions in 10-minutes, averaged over 10-minute segment of tracing.

• Greater then 5 contractions in 10-minutes, averaged over a 30-minute time interval.

• Occurring every 1-2 minutes during a 10-minute window.

Sinusoidal pattern can be documented when

• cycles are 4-6 beats per minute in frequency.

• the pattern lasts 20 minutes or longer.

• there is moderate or minimal variability.

When looking at the fetal heart rate, the most important characteristic to determine the absence of metabolic acidemia is

• absence of late decelerations.

• baseline rate within normal range.

• presence of moderate variability.

A baseline tachycardia occurs when the fetal heart rate

• accelerates greater than 15 beats above the baseline

• is 160 beats or higher for greater than 10 minutes

• is 160 beats or higher for greater than 2 minutes but less than 10 minutes

A baseline bradycardia occurs when the fetal heart rate is

• below 120 for more than 10 minutes

• below 110 for more than 2 minutes but less than 10 minutes

• below 110 for more than 10 minutes

Amplitude range of the baseline defines baseline

• change

• rate

• variability

Tags

NGSS.HS-PS4-1