Presentation on theme: "Determination of Estimated Birth Date"— Presentation transcript:
1Determination of Estimated Birth Date It is impossible to predict the day of birth.Estimated date of birth - EDB, EDD or EDC.280 days - 38 to 42 weeks in length.Nagele’s rule:1st day of last menstrual period.Count back 3 months and add 7 days.Normal variations - if ovulation and fertilization occurs early or late in the menstrual cycle the pregnancy may be 2 weeks before or 2 weeks after the EDD.
3Fetal Growth and Development Nurses responsibilitysigned consent form with information on the procedure and possible risksscheduling the procedureexplaining the procedure to the woman and support personpreparing the woman physically and psychologicallyproviding support during the procedureassessing both fetal and maternal responses to proceduresprovide follow up caremanage equipment and specimens
4Fetal Growth and Development Estimated Fetal Growth:McDonald’s rule - method of determining, during mid pregnancy, that the fetus is growing in utero by measuring fundal (uterine) height.Distance from fundus to symphysis in centimeters is equal to the week of gestation between week 20 to 31.Measure from the notch of the symphysis pubis to over the top of the fundus with woman lies supine.This becomes inaccurate in 3rd trimester because the fetus is growing in wt. than height.Milestones:12 weeks- over symphysis pubis20 weeks at umbilicus36 weeks xiphoid process
5Fetal Growth and Development Assessing Fetal Well-Being:Fetal movement - quickening week 18 to 20peaks at week 28 to 38healthy fetus moves 10 times a day.Ask mother to lie in left recumbent position after a meal and record number of fetal movements in next hour.2 times in 10 minutesfewer than 5 in 1 hour - notify the doctor.
6Assessing Fetal Well-Being Fetal Heart Rate:120 to 160 beats per minute throughout pregnancy.Week 10 to 11 heart sounds can be heard and counted with a doppler.Rhythm Strip Testing:baseline fetal heart rate per minute and long and short term variability.Place woman in semi-fowlers (prevents supine hypotension syndrome).
7Assessing Fetal Well-Being Monitors are attached abdominally and recorded for 20 minutes (mother in fixed position)Short term variability- beat to beat variability- denotes small changes in rate from second to second if parasympathetic nervous system is receiving adequate O2 and nutrients.Long term variability - denotes the differences in heart rate that occur over 20 minutes (fetus moves 2x/10 min) increases with movement.
8Assessing Fetal Well-Being This reflects fetal sympathetic nervous system.Nonstress Testing:measures response of fetal heart rate to movement.Monitors are attached to abdomenmother pushes a button attached to the monitor when she feels the fetus move.FHR should increase 15 beats/ min and remain elevated for 15 seconds.
9Assessing Fetal Well-Being Decreases when fetus quiets. If no increase is noticeable with movement poor O2 perfusion of fetus id suggested.Test lasts 10 to 20 minutes.If no fetal movements in 20 minutes fetus may be sleeping.Orange juice or carbohydrate may increase blood glucose level which stimulate the fetus. Also loud noise may stimulate fetus.
10Assessing Fetal Well-Being Vibroacustic Stimulation:Acustic stimulation (artificial larynx) applied to abdomen to produce a sharp sound, startling and waking the fetus.80 dB frequency of 80 Hz.Contraction Stress Testing:FHR is analyzed in conjunction with contractions.Mother stimulates the nipple which releases oxytocin which initiates uterine contractions
11Assessing Fetal Well-Being External uterine contraction and FHR monitors are applied3 contractions with duration of 40 seconds or more present in a 10 minute period.Normal (negative) when no FHR decelerations are present with contractions.Abnormal (positive) 50% or more contractions cause a late deceleration (dip in FHR) toward the end of a contraction and continues after the contraction.Woman waits 30 min after the test.
12Assessing Fetal Well-Being Ultrasound:response of sound waves against objects.Diagnose pregnancy at 6 weeks gestationconfirm presence, size, and location of placenta and amniotic fluid.Establishes fetal growth, gross defectsEstablish presentation and position (sex)Predict maturity by biparietal diameterMother has to have a full bladder ( drink a full glass of water q 15 min. in 1 1/2 hours
13Assessing Fetal Well-Being Place a towel under the right buttock to tip uterus away from the vena cava.Gel applied to abdomen (room temperature)Transducer is applied intravaginal or abdominalPicture of sonogramBiparietal Diameter:measures side to side measurement of fetal head (8.5cm or more infant weighs > 2500g 5.5 lb) 40 week gestation.
14Assessing Fetal Well-Being Also measures head circumference and femoral length.Doppler Umbilical Velocimetry:Measures velosity at which RBC and vessels are traveling.Placental Grading:amount of calcium deposits in base of placenta.Amniotic Fluid Volume Assessment:average index is 15 cm between wks.
15Assessing Fetal Well-Being ECG at week 11 of pregnancy (inaccurate before week 20 because fetal electrical conduction is week).MRI used to diagnos ectopic pregnancy or trophoblastic disease.Maternal Serum Alpha-Fetoprotein is a substance produced by the fetal liver that is present in amniotic fluid and maternal serum. Begins to rise at week 11.Detects Down Syndrome, open spinal or abdominal defects.
16Assessing Fetal Well-Being Triple Screening - analysis of 3 indicators:Maternal serum Alpha-fetoproteinunconjugated estriolhCGused for Downs syndromeChorionic Villi Sampling (CVS)biopsy and analysis for chromosomal analysis done at week 10 to 12.
17Assessing Fetal Well-Being Amniocentesis:aspiration of amniotic fluid from the uterus for examination.Week 12 to 131 mL of fluid is needed3 to 4 in 20 to 22 gauge spinal needlewoman rest for 30 minutes after the procedureconstant monitoring for FR and contractionsif Rh-neg. blood give RhoGAM
18Assessing Fetal Well-Being Amniocentesis:color of water or slight yellow tingestrong yellow- bilirubingreen- meconiumlecithin/ sphingomyelin ratioprotein components of lung enzyme surfactant that alveoli form week 22-24phosphatidyl glycerol and desaturated phosphtidylcolinefound in surfactant
19Assessing Fetal Well-Being Bilirubin Determinationmust be blood free to analyze bilirubinChromosome Analysisuses fetal skin cells for karyotypingFetal Fibronectinglycoprotein that helps placenta attach to the uterine decidua ( preterm labor).Inborn Errors of Metabolisminherited diseases from inborn errors
20Assessing Fetal Well-Being Alpha-FetoproteinPercutaneous Umbilical Blood Samplingaspiration of blood from the umbilical vein for analysisAmnioscopyvisual inspection of amniotic fluid through the cervix and membranes with a small fetoscope (detects meconium).Fetoscopyvisualizing the fetus with fetoscope
21Assessing Fetal Well-Being confirms intactness of spinal columnbiopsy of fetal tissue and blood samplesurgeryphotosdone week16 to17 at the earliestrisks-premature labor, infection.
22Assessing Fetal Well-Being Biophysical Profile (fetal Apgar)combines 4 to 6 parameters into one assessmentfetal movement and breathing, fetal tone, amniotic fluid volume, placental gradingfetal heart reactivity.more accurate in predicting well being than any single assessment.a score of 4 to 6 denotes a fetus in jeopardy.