ch. 9 notes

110-160 beats/min

• frequency, duration, tone, intensity
• -mild (1+), moderate (2+), strong (3+)

• -manually (doptone, fetoscope)
• -externally (ultrasound toco)
• -internally (fetal electrode)

external: flexible disc on mothers abdomen, recorded on graph paper

-when used with tocodynamometer, provides info from FHR in relation to the duration and frequency of contractions

• internal: need to be dilated and have water broken
• -cervix must be dilated at lease 2 cm
• -wires extend from vagina to leg plate and connected to monitor
• -stays on until delivery

• tells how often we need to chart, ever 1 hr.
• active phase: every 15-30 mins
• latent phase: 5-15 mins

• accelerations: 15x15 for 32 weeks and above, 10x10 under 32 weeks
• -may be due to fetal activity or mild cord compression
• -indicate adequate fetal oxygenation

may be due to head compression, mirror contractions, usually does not require intervention

-due to cord compression, variable in shape and timing,  (v,w,u), change maternal position, iv bolus, o2, amnioinfusion

• (worst kind)
• -caused by placental insufficiency
• -late in onset, rounded shape
• -change maternal position, iv bolus, o2, d/c pitocin

interventions for nonreassuring FHR patterns are referred to as intrauterine resuscitation. these interventions maximize intravascular volume, uterine perfusion, placental exchange, and oxygen delivery to the fetus