NURSING > EXAM > USMLE Step 2 CK-OB/GYN Exam Study Questions 2022/23 COMPLETE SOLUTION (All)

USMLE Step 2 CK-OB/GYN Exam Study Questions 2022/23 COMPLETE SOLUTION

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What is Nagele's rule? - ✔✔due date = LMP + 9 months + seven days What is developmental age? - ✔✔number of weeks and days since fertilization. typically used only in research, as the exact date of fertilization is not commonly known What is gestational age? - ✔✔number of wks and days measured from the first day of the LMP. How else can gestational age be determined? - ✔✔Fundal height: at 20wks, uterus is at the umbilicus and grows approx 1 cm/wk Quickening, or appreciation of fetal movt: typically occurs at 17-18 wks Fetal heart tones: can be heard at 10-12 wks by Doppler Ultrasound: measures fetal crown-rump length (CRL) at 5-12wks and measured biparietal diameter (BPD), femur length (FL), and abd circumference (AC) from 13 wks. U/S measurement of GA is most reliable during the first trimester How does renal flow change in pregnancy? - ✔✔increases 25-50% How does glomerular filtration rate change in pregnancy? - ✔✔increases early, then plateaus How does uterine weight change in pregnancy? - ✔✔increases from about 60-70g to about 900-1200g How does body weight change in pregnancy? - ✔✔average 11kg (25lb) increase What is the standard for diagnosing pregnancy? - ✔✔B-hCG- produced by placenta; peaks at 100,000 mIU/mL by 10wks of gestation - decreases throughout the second trimester; levels off in the third trimester - hCG levels double approx every 48hrs during early pregnancy. This is often used to diagnose ectopic pregnancy when doubling is abnormal What is a quantitative B-hCG used for? - ✔✔- to diagnose and follow ectopic pregnancy - to monitor trophoblastic disease - to screen for fetal aneuploidy What is a quad screen? - ✔✔1) Maternal serum alpha-fetoprotein - produced by the fetus, crosses the placenta in small amounts and enters the maternal circulation - Elevated: assoc w/ open neural tube defects (anencephaly, spina bifida), abd wall defects (gastroschisis, omphalocele), multiple gestation, incorrect gestational dating, fetal death, and placental abnormalities (e.g. placental abruption) - Decreased: assoc w/ trisomy 21 and 18, fetal demise, and inaccurate gestational dating. 2) inhibin A 3) estriol 4) B-hCG What quad screen results suggest Trisomy 18? - ✔✔ALL four decreased What quad screen results suggest Trisomy 21 - ✔✔decreased AFP and estriol Increased B-hCG and inhibin A How does heart rate change in pregnancy? - ✔✔gradually increases 20% How does blood pressure change in pregnancy? - ✔✔gradually decreases 10% by 34 wks, then increases to prepregnancy values How does stroke volume change in pregnancy? - ✔✔increases to maximum at 19wks, then plateausHow does cardiac output change in pregnancy? - ✔✔rises rapidly by 20%, then gradually increases an additional 10% by 28wks How does peripheral venous distention change in pregnancy? - ✔✔progressive increase to term How does peripheral vascular resistance change in pregnancy? - ✔✔progressive decrease to term How does respiratory rate change in pregnancy? - ✔✔unchanged How does tidal volume change in pregnancy? - ✔✔increases by 30-40% How does expiratory reserve change in pregnancy? - ✔✔gradual decrease How does vital capacity change in pregnancy? - ✔✔unchanged How does respiratory minute volume change in pregnancy? - ✔✔increases by 40% How does blood volume change in pregnancy? - ✔✔increases by 50% in second trimester How does hematocrit change in pregnancy? - ✔✔decreases slightly How does fibrinogen change in pregnancy? - ✔✔increases How do electrolytes change in pregnancy? - ✔✔unchanged How does sphincter tone change in pregnancy? - ✔✔decreases

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