LATE DECELERATIONS ARE MEDIATED PRIMARILY BY
CHEMORECEPTORS
BASELINE
FHR IN A 10 MIN SEGMENT
TACHYCARDIA
FHR >160
BRADYCARDIA
FHR <110
VARIABILITY
VARIATIONS IN BASELINE ABSENT-0
MIN <=5
MOD 6-25
MARKED >25
NO DISTINCTION IS MADE BETWEEN SHORT TERM & LONG TERM VARIABILITY
BECAUSE
THEY ARE VISUALIZED AS A UNIT
ACCELERATION
ABRUPT INCREASE <30 SEC FROM BASELINE
ACCELERATION IN 32+ WEEKS GESTATION
PEAK OF AT LEAST 15 BPM AND DURATION OF 15 SEC BUT < THAN 2 MINUTES
ACCELERATION IN < 32 WEEKS GESTATION
PEAK OF AT LEAST 10 BPM AND DURATION 10 SEC BUT < THAN 2 MINUTES
PROLONGED ACCELERATION
LASTS >= 2 MIN BUT < THAN 10 MIN
BASE LINE CHANGE
ACCELERATION LASTING >= 10 MIN
EARLY
GRADUAL ONSET >= 30 SECONDS W CONTRACTION >= TO NADAR.
HEAD COMPRESSION...VAGAL RESPONSE
LATE
, GRADUAL ONSET >= 30 SECONDS TO NADAR
OCCUR AFTER CONTRACTION
VARIABLE
ABRUPT ONSET <30 SECONDS TO NADAR
CATEGORY 1
FHT INCLUDES ALL OF THE FOLLOWING:
RATE: 110-160
MODERATE VARIABILITY
ACCELERATIONS PRESENT OR ABSENT
0 LATE OR VARIABILE DECELERATIONS
EARLY DECELERATIONS PRESENT OR ABSENT
CATEGORY 2
ALL FHT NOT CATEGORY 1 OR CATEGORY 3
CATEGORY 3
FHT INCLUDES AT LEAST ONE OF THE FOLLOWING:
ABSENT VARIABILITY WITH RECURRENT LATES
ABSENT VARIABILITY WITH RECURRENT VARIABLES
ABSENT VARIABILITY WITH BRADY FOR 10 MIN
SINUSOIDAL PATTERN FOR AT LEAST 20 MIN
SINUSOIDAL PATTERN
SAW TOOTH >= 20 MIN
FEVER/INFECTION
TACHYCARDIA
DECREASED VARIABILITY
MEDICATIONS
DEPENDS ON MED BUT INCLUDES CHANGES:
BASELINE
FREQUENCY AND AMPLITUDE OF ACCELS
VARIABILITY
SINUSOIDAL PATTERN
HYPERTHYROIDISM