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decg application requirements - determination of dilation, station, and presenting part
iupc records contraction - frequency, duration, intensity of contractions, and resting tone
one limitation of a decg is - it can record maternal heart rate when there is a fetal demise
an iupc measures - resting tone and intensity of contractions
which of the following is the most accurate mean of obtaining information regarding the strength,
frequency, and duration of contractions?
iupc, palpation, toco - iupc
according to acog, a high risk patient in second stage of labor should have fhr reviewed how often? -
q5 min
a external fetal monitor measures the - mechanical movement of the heart reflected off sounds
waves
decg measures - r to r intervals
when auscultating a fhr baseline, the fetal heart rate should be confirmed after the contractions for?
- 30-60 seconds
what fetal heart rate characteristics can be determined with auscultation? - baseline
uteroplacental circulation - maternal blood enters the intervillous space via the spiral arteries
intervillous space - the space between mom blood vessels (spiral arteries) and the fetal portion of
placenta (chorion)
, maternal circulation and fetal circulation interact by - passive diffusion
factors affecting fetal oxygenation - uterine activity (tachysystole, hypertonus, medications,
abruption, cocaine), maternal conditions (hypertension, cardiac disease, diabetes/smoking),
maternal hypotension (supine position, anesthesia (sympathetic blockade), hemorrhage/
hypovolemic shock), placental changes (infection, degenerative, surface area, edema),
vasoconstriction (enodgenous, exogenous)
how long do you want between contractions - 60 seconds
fetal circulation - - umbilical vein carries O2
- foramen ovale = right atria --> left atria (bypass pulmonary circulation)
- ductus arteriosus = pulmonary artery --> aorta (bypass lungs)
fetal circulation pathway - umbilical vein, ductus venosus, to IVC, right atrium, oxygen rich blood goes
through patent foramen ovale to left atria to left ventricle to body, body to right atria to ventricle,
bypassess lung via ductus arteriosus (oxygen poor blood), to lower half of the body
fetal hgb - higher affinity for oxygen
foramen ovale - allows blood to enter the left atrium from the right atrium, right to left shunt. allows
baby to get the most oxygen rich blood to the brain
fetal heart rate regulation-parasympathetic nervous system (branch of ANS) physiology - originates in
the medulla oblongata, vagus nerve (10th cranial nerve overrides the SA and AV nodes), stimulation
releases acetylcholine, pathway for transmission of FHR variability, variability represents intact CNS
pathway.
fetal heart rate regulation- parasympathetic nervous system (effect on FHR) - decreases FHR, pokey
parasympathetic, moderate variability indicates absence of metabolic acidemia, modulates baseline
FHR with sympathetic branch
fetal heart rate regulation. sympathetic nervous system (branch of the ANS) physiology - nerve fibers
widely distributed throughout myocardium at term, stimulation releases catecholemines
(norepi/epi), reserve mechanism, betablockers, fetal vasoconstriction and hypertension