fetal monitoring

what am i

100

at least 2 min in any 10 minute window 

baseline 

200

fluctuation in baseline FHR that are irregular in amplitude and frequency 

Variability 

300

visually apparent abrupt increase in FHR above baseline 

Acceleration

400

visually apparent abrupt decrease in FHR below baseline 

variable decceleration

500

visually apparent sine wavelike undulating pattern in FHR baseline with cycle frequency 2-5/min

sinusoidal pattern

3 tier interpretation

100

term,baseline 145,moderate variability,no acceleration with early decelerations 

category 1 

200

160 baseline moderate variability acceleration present no decelerations

category 1 

300

baseline 165 moderate variability recurrent late decelerations 

category 2 

400

baseline 175 minimal baseline variability prolonged deceleration 

category 2 

500

baseline 145 absent variability recurrent variable decelerations 

category 3 

guess what?

100

gradual FHR decrease from onset to nadir 30 sec or more coincident with contraction 

early deceleration

200

gradual FHR decrease from onset to nadir 30 sec or more after beginning peak and end of contraction

late decelration

300

decelerations equal or more than 50%of contraction in 20 min period

recurrent decelerations 

400

decelerations occur with less than 50 % of contractions in 20 min period 

intermittent decelerations

500

decrease in FHR 15 bpm or greater lasting 15 sec or greater , less than 2 min 

variable deceleration

pathophysiology

100

early deceleration

head compression

200

variable deceleration

cord compression

300

late decelration

uteroplacental insufficiency 

400

sinusoidal pattern

fetal intracranial hemorrhage, severe fetal asphyxia, severe fetal anemia 

500

abrupt baseline spiking 

suspected fetal cardiac arrhythmia