A 25-year-old female comes to her obstetrician’s office for a prenatal visit. She has a transvaginal ultrasound that correlates with her last menstrual period and dates her pregnancy at 4 weeks. She has no complaints except some nausea during the morning that is improving. She comments that she has had some strange food cravings, but has no issues with eating a balanced diet. Her BMI is 23 kg/m^2 and she has gained 1 pound since the start of her pregnancy. She is curious about her pregnancy and asks the physician what her child is now able to do. Which of the following developments is expected of the fetus during this embryological phase?
Q42
A 25-year-old G1P0000 presents to her obstetrician’s office for her first prenatal visit. She had a positive pregnancy test 6 weeks ago, and her last period was about two months ago, though at baseline her periods are irregular. Aside from some slight nausea in the mornings, she feels well. Which of the following measurements would provide the most accurate dating of this patient’s pregnancy?
Q43
A 21-year-old gravida 1, para 0 woman presents to the family medicine clinic for her first prenatal appointment. She states that she has been taking folic acid supplements daily as directed by her mother. She smokes a few cigarettes a day and has done so for the last 5 years. Pediatric records indicate the patient is measles, mumps, and rubella non-immune. Her heart rate is 78/min, respiratory rate is 14/min, temperature is 36.5°C (97.7°F), and blood pressure is 112/70 mm Hg. Her calculated BMI is approximately 26 kg/m2. Her heart is without murmurs and lung sounds are clear bilaterally. Standard prenatal testing is ordered. Which of the following is the next best step for this patient’s prenatal care?
Q44
A 23-year-old woman presents to her primary care physician for a wellness checkup. She has been treated for gonorrhea and chlamydia 3 times in the past 6 months but is otherwise healthy. She smokes cigarettes, drinks alcohol regularly, and wears a helmet while riding her bicycle. The patient is generally healthy and has no acute complaints. Her vitals and physical exam are unremarkable. She is requesting advice regarding contraception. The patient is currently taking oral contraceptive pills. Which of the following would be the most appropriate recommendation for this patient?
Q45
A 23-year-old woman, gravida 1 para 0, at 16 weeks’ gestation presents to the physician because of swelling of her right breast for 1 month. She has no personal or family history of any serious illnesses. She has taken contraceptive pills over the past few years. Vital signs are within normal limits. Physical examination shows asymmetric breasts with the right breast being enlarged. The palpation of the breast shows a 4 x 5 cm (1.5 x 1.9 in) mass under the skin in the upper outer quadrant. It is nontender and mobile with a rubbery consistency and regular borders. A breast ultrasound shows a round and solid homogeneous mass with well-defined borders and low echogenicity, measuring 5 cm (1.9 in) in diameter. Which of the following is the most likely diagnosis?
Q46
A 19-year-old woman comes to the physician because of recent weight gain. She started a combined oral contraceptive for dysmenorrhea and acne six months ago. She has been taking the medication consistently and experiences withdrawal bleeding on the 4th week of each pill pack. Her acne and dysmenorrhea have improved significantly. The patient increased her daily exercise regimen to 60 minutes of running and weight training three months ago. She started college six months ago. She has not had any changes in her sleep or energy levels. Her height is 162 cm and she weighs 62 kg; six months ago she weighed 55 kg. Examination shows clear skin and no other abnormalities. A urine pregnancy test is negative. Which of the following is the most appropriate next step in management?
Q47
A 29-year-old G1P0 presents to her obstetrician for her first prenatal care visit at 12 weeks gestation by last menstrual period. She states that her breasts are very tender and swollen, and her exercise endurance has declined. She otherwise feels well. She is concerned about preterm birth, as she heard that certain cervical procedures increase the risk. The patient has a gynecologic history of loop electrosurgical excision procedure (LEEP) for cervical dysplasia several years ago and has had negative Pap smears since then. She also has mild intermittent asthma that is well controlled with occasional use of her albuterol inhaler. At this visit, this patient’s temperature is 98.6°F (37.0°C), pulse is 69/min, blood pressure is 119/61 mmHg, and respirations are 13/min. Cardiopulmonary exam is unremarkable, and the uterine fundus is just palpable at the pelvic brim. Pelvic exam reveals normal female external genitalia, a closed and slightly soft cervix, a 12-week-size uterus, and no adnexal masses. Which of the following is the best method for evaluating for possible cervical incompetence in this patient?
Q48
A 25-year-old G2P1 woman at 12 weeks gestational age presents to the office to discuss the results of her routine prenatal screening labs, which were ordered during her 1st prenatal visit. She reports taking a daily prenatal vitamin but no other medications. She complains of mild fatigue and appears pale on exam. Her complete blood count (CBC) shows the following:
Hemoglobin (Hb) 9.5 g/dL
Hematocrit 29%
Mean corpuscular volume (MCV) 75 µm3
Which of the following are the most likely hematologic states of the patient and her fetus?
Q49
A 23-year-old woman presents to the emergency department with burning and increased urinary frequency. The patient states that her symptoms started yesterday and have been worsening despite hydrating well. The patient is generally healthy, does not smoke or drink alcohol, and is 10 weeks pregnant. She is currently taking folate, iron, and a multivitamin. Her temperature is 98.1°F (36.7°C), blood pressure is 122/83 mmHg, pulse is 83/min, respirations are 13/min, and oxygen saturation is 98% on room air. Physical exam is notable for an absence of costovertebral angle tenderness and mild discomfort to palpation of the lower abdomen. An initial urine dipstick is notable for the presence of leukocytes, bacteria, and nitrates. Which of the following is the best treatment for this patient?
Q50
A 29-year-old, gravida 1 para 0, at 10 weeks' gestation comes to the physician for progressively worsening emesis, nausea, and a 2-kg (4.7-lb) weight loss over the past 2 weeks. The most recent bouts of vomiting occur around 3–4 times a day, and she is stressed that she had to take a sick leave from work the last 2 days. She is currently taking ginger and vitamin B6 with limited relief. Her pulse is 80/min, blood pressure is 100/60 mmHg, and respiratory rate is 13/min. Orthostatic vital signs are within normal limits. The patient is alert and oriented. Her abdomen is soft and nontender. Urinalysis shows no abnormalities. Her hematocrit is 40%. Venous blood gas shows:
pH 7.43
pO2 42 mmHg
pCO2 54 mmHg
HCO3- 31 mEq/L
SO2 80%
In addition to oral fluid resuscitation, which of the following is the most appropriate next step in management?
Prenatal Care US Medical PG Practice Questions and MCQs
Question 41: A 25-year-old female comes to her obstetrician’s office for a prenatal visit. She has a transvaginal ultrasound that correlates with her last menstrual period and dates her pregnancy at 4 weeks. She has no complaints except some nausea during the morning that is improving. She comments that she has had some strange food cravings, but has no issues with eating a balanced diet. Her BMI is 23 kg/m^2 and she has gained 1 pound since the start of her pregnancy. She is curious about her pregnancy and asks the physician what her child is now able to do. Which of the following developments is expected of the fetus during this embryological phase?
A. Formation of male genitalia
B. Closure of the neural tube (Correct Answer)
C. Movement of limbs
D. Creation of the notochord
E. Cardiac activity visible on ultrasound
Explanation: ***Closure of the neural tube***
- At **4 weeks gestation**, the **neural tube** is in the process of closing, forming the precursor for the brain and spinal cord, making this a critical developmental milestone.
- This period is vital for the prevention of neural tube defects like **spina bifida** and **anencephaly**.
*Formation of male genitalia*
- The differentiation of **external genitalia** (male or female) occurs much later, typically around weeks **9-12 of gestation**, much later than the 4-week mark discussed here.
- Prior to this, the genital ridges are bipotential and do not yet show sex-specific characteristics.
*Movement of limbs*
- While limb buds begin to appear around 4-5 weeks, coordinated **limb movements** are typically observed much later, around **10-12 weeks** of gestation, as muscular and neurological systems further develop.
- Early movements are typically subtle and reflex-like, rather than purposeful.
*Creation of the notochord*
- The **notochord** is formed during **gastrulation**, which occurs predominantly in the **third week of gestation**, prior to the 4-week mark.
- It serves as the primary axial support for the embryo and induces the formation of the neural tube.
*Cardiac activity visible on ultrasound*
- **Cardiac activity** typically becomes detectable on transvaginal ultrasound between **5 and 6 weeks gestation**, shortly after the 4-week mark.
- At 4 weeks, the heart tube may have started to form, but discernible beating is usually not yet evident.
Question 42: A 25-year-old G1P0000 presents to her obstetrician’s office for her first prenatal visit. She had a positive pregnancy test 6 weeks ago, and her last period was about two months ago, though at baseline her periods are irregular. Aside from some slight nausea in the mornings, she feels well. Which of the following measurements would provide the most accurate dating of this patient’s pregnancy?
A. Crown-rump length (Correct Answer)
B. Femur length
C. Abdominal circumference
D. Biparietal diameter
E. Serum beta-hCG
Explanation: ***Crown-rump length***
- This measurement, typically obtained via **transvaginal ultrasound** in the first trimester (up to 13 weeks 6 days), provides the **most accurate gestational age dating**.
- It's highly precise because fetal growth is very consistent during this early period, minimizing variability.
*Femur length*
- This is a biometric measurement typically used for dating in the **second and third trimesters**.
- Its accuracy for dating is lower than CRL in the first trimester and becomes more variable in later pregnancy due to individual fetal growth differences.
*Abdominal circumference*
- This measurement is primarily used in the **late second and third trimetes**r to assess fetal growth and weight, rather than for accurate dating.
- It is highly susceptible to variations based on fetal nutrition and health, making it a poor choice for initial dating.
*Biparietal diameter*
- This is a reliable measurement for dating from the **late first trimester through the second trimester**, but it is less accurate than CRL in the very early first trimester.
- After the first trimester, its accuracy declines compared to earlier measurements as individual variations in head size become more prominent.
*Serum beta-hCG*
- While a **positive beta-hCG test** confirms pregnancy and quantitative levels can suggest gestational age ranges, it's not a precise dating tool.
- Levels vary widely among individuals and with different types of pregnancies (e.g., multiples), making it unsuitable for accurate dating.
Question 43: A 21-year-old gravida 1, para 0 woman presents to the family medicine clinic for her first prenatal appointment. She states that she has been taking folic acid supplements daily as directed by her mother. She smokes a few cigarettes a day and has done so for the last 5 years. Pediatric records indicate the patient is measles, mumps, and rubella non-immune. Her heart rate is 78/min, respiratory rate is 14/min, temperature is 36.5°C (97.7°F), and blood pressure is 112/70 mm Hg. Her calculated BMI is approximately 26 kg/m2. Her heart is without murmurs and lung sounds are clear bilaterally. Standard prenatal testing is ordered. Which of the following is the next best step for this patient’s prenatal care?
A. MMR vaccine during pregnancy
B. Serology, then vaccine postpartum
C. MMR vaccine postpartum (Correct Answer)
D. Serology, then vaccine during pregnancy
E. MMR vaccine and immune globulin postpartum
Explanation: ***MMR vaccine postpartum***
- The **MMR vaccine is a live attenuated vaccine** and therefore **contraindicated during pregnancy** due to the theoretical risk of fetal infection and congenital rubella syndrome.
- Vaccinating postpartum ensures the mother develops immunity without any risk to the current pregnancy, and it's also safe for breastfeeding.
*MMR vaccine during pregnancy*
- Administering a **live attenuated vaccine** like MMR during pregnancy is generally avoided due to the **theoretical risk of teratogenicity**.
- While documented cases of congenital rubella syndrome from the vaccine are rare, the risk is not zero, making it unsafe for routine administration during gestation.
*Serology, then vaccine postpartum*
- The patient's records already indicate she is **MMR non-immune**, rendering additional serology unnecessary to determine her immune status.
- The crucial step is the timing of vaccination, which should be postpartum, regardless of repeat serology findings.
*Serology, then vaccine during pregnancy*
- As explained, **MMR vaccination is contraindicated during pregnancy**, making immediate vaccination during gestation an inappropriate course of action.
- While serology can confirm non-immunity, it doesn't change the recommendation to delay vaccination until after delivery.
*MMR vaccine and immune globulin postpartum*
- **Immune globulin** is typically given for passive immunity following exposure to certain diseases if the patient is non-immune (e.g., RhoGAM for Rh-negative mothers).
- It is **not routinely administered with the MMR vaccine postpartum** for healthy, non-immune individuals, as the vaccine itself stimulates active immunity.
Question 44: A 23-year-old woman presents to her primary care physician for a wellness checkup. She has been treated for gonorrhea and chlamydia 3 times in the past 6 months but is otherwise healthy. She smokes cigarettes, drinks alcohol regularly, and wears a helmet while riding her bicycle. The patient is generally healthy and has no acute complaints. Her vitals and physical exam are unremarkable. She is requesting advice regarding contraception. The patient is currently taking oral contraceptive pills. Which of the following would be the most appropriate recommendation for this patient?
A. Intrauterine device
B. Tubal ligation
C. Etonogestrel implant
D. Condoms (Correct Answer)
E. Pull out method
Explanation: ***Condoms***
- The patient has a history of **recurrent STIs**, indicating a need for barrier protection in addition to contraception to prevent future infections.
- **Condoms** are the only contraceptive method listed that provides significant protection against STIs, making them the most appropriate recommendation for this patient's overall health and sexual practices.
*Intrauterine device*
- While a highly effective contraceptive, an **IUD** does not protect against sexually transmitted infections (STIs), and the patient's history suggests a high risk for contracting STIs.
- Additionally, some IUDs (like copper IUDs) can **increase menstrual bleeding**, and hormonal IUDs have their own systemic effects.
*Tubal ligation*
- This is a permanent sterilization method that, while highly effective for contraception, offers **no protection against STIs**.
- It is generally considered for women who have completed childbearing or are certain they do not desire future pregnancies, which may not be the case for a 23-year-old.
*Etonogestrel implant*
- The **etonogestrel implant** is an effective form of contraception but offers **no protection against STIs**.
- The patient's history of recurrent STIs indicates that a method also providing STI prevention is crucial.
*Pull out method*
- The **pull-out method** is an unreliable form of contraception with a high failure rate, offering minimal protection against pregnancy and **no protection against STIs**.
- Given the patient's history of STIs and desire for effective contraception, this method is entirely inappropriate.
Question 45: A 23-year-old woman, gravida 1 para 0, at 16 weeks’ gestation presents to the physician because of swelling of her right breast for 1 month. She has no personal or family history of any serious illnesses. She has taken contraceptive pills over the past few years. Vital signs are within normal limits. Physical examination shows asymmetric breasts with the right breast being enlarged. The palpation of the breast shows a 4 x 5 cm (1.5 x 1.9 in) mass under the skin in the upper outer quadrant. It is nontender and mobile with a rubbery consistency and regular borders. A breast ultrasound shows a round and solid homogeneous mass with well-defined borders and low echogenicity, measuring 5 cm (1.9 in) in diameter. Which of the following is the most likely diagnosis?
A. Fibroadenoma (Correct Answer)
B. Invasive ductal carcinoma
C. Lobular carcinoma
D. Medullary carcinoma
E. Fibrocystic changes
Explanation: ***Fibroadenoma***
- The patient's age (23 years old), pregnancy status, and the description of the mass—**rubbery, mobile, nontender, with regular borders**, and **low echogenicity on ultrasound**—are highly characteristic of a fibroadenoma.
- Fibroadenomas are **benign tumors** common in young women and can grow during pregnancy due to hormonal stimulation.
*Invasive ductal carcinoma*
- This typically presents as a **hard, fixed, irregular mass** that is often **nontender** but may cause skin dimpling or nipple retraction, none of which are described.
- While it is the most common form of breast cancer, its characteristics **do not match** the highly mobile and rubbery nature of the described mass.
*Lobular carcinoma*
- Often presents as a **diffuse thickening** rather than a well-defined mass and can be multifocal or bilateral.
- It's **less common** than invasive ductal carcinoma and its presentation is inconsistent with the clear, round mass described.
*Medullary carcinoma*
- This is a **rare subtype of invasive ductal carcinoma** that can appear well-circumscribed on imaging, mimicking a benign lesion.
- However, it typically presents as a **firm, fixed mass** and is less likely in a young woman with a classic fibroadenoma presentation.
*Fibrocystic changes*
- Characterized by **multiple cysts, tenderness, and fluctuating size** with menstrual cycles; often described as "lumpy" breasts rather than a single, well-defined mass.
- While common, the description of a **single, discrete, rubbery, mobile mass** is not typical for fibrocystic changes.
Question 46: A 19-year-old woman comes to the physician because of recent weight gain. She started a combined oral contraceptive for dysmenorrhea and acne six months ago. She has been taking the medication consistently and experiences withdrawal bleeding on the 4th week of each pill pack. Her acne and dysmenorrhea have improved significantly. The patient increased her daily exercise regimen to 60 minutes of running and weight training three months ago. She started college six months ago. She has not had any changes in her sleep or energy levels. Her height is 162 cm and she weighs 62 kg; six months ago she weighed 55 kg. Examination shows clear skin and no other abnormalities. A urine pregnancy test is negative. Which of the following is the most appropriate next step in management?
A. Measure serum testosterone concentration
B. Perform a low-dose dexamethasone suppression test
C. Measure serum TSH level
D. Switch contraceptive to a non-hormonal contraceptive method
E. Reassure the patient (Correct Answer)
Explanation: ***Reassure the patient***
- The patient's **weight gain of 7 kg (BMI 23.6 kg/m²) over six months is within the normal range** and is likely due to the combination of starting college (lifestyle changes) and increased muscle mass from her intensified exercise regimen.
- Her improved acne and dysmenorrhea, consistent withdrawal bleeding, and lack of other concerning symptoms (e.g., changes in sleep, energy, or examination abnormalities) suggest the oral contraceptive is well-tolerated and effective for its intended purposes.
*Measure serum testosterone concentration*
- Although **PCOS** can cause weight gain and acne, the patient's acne has significantly improved with combined oral contraceptives, and her menstrual cycles are regular (withdrawal bleeding).
- There are no other signs of hyperandrogenism (e.g., hirsutism, clitoromegaly) to warrant testosterone measurement.
*Perform a low-dose dexamethasone suppression test*
- This test is used to diagnose **Cushing syndrome**, which can cause weight gain and acne.
- However, the patient does not exhibit other classic features of Cushing syndrome such as central obesity, moon facies, striae, or proximal muscle weakness, and her skin is described as clear.
*Measure serum TSH level*
- **Hypothyroidism** can lead to weight gain, but the patient reports no changes in her sleep or energy levels, and increased exercise suggests she is not experiencing fatigue.
- Other common symptoms of hypothyroidism, such as cold intolerance or constipation, are not mentioned.
*Switch contraceptive to a non-hormonal contraceptive method*
- While some women experience weight gain with hormonal contraceptives, the **evidence for significant weight gain directly attributable to oral contraceptives is mixed and often minimal**.
- Given that her primary concerns (dysmenorrhea and acne) have significantly improved without other adverse effects, and her weight gain can be otherwise explained, switching contraception is not the most appropriate first step.
Question 47: A 29-year-old G1P0 presents to her obstetrician for her first prenatal care visit at 12 weeks gestation by last menstrual period. She states that her breasts are very tender and swollen, and her exercise endurance has declined. She otherwise feels well. She is concerned about preterm birth, as she heard that certain cervical procedures increase the risk. The patient has a gynecologic history of loop electrosurgical excision procedure (LEEP) for cervical dysplasia several years ago and has had negative Pap smears since then. She also has mild intermittent asthma that is well controlled with occasional use of her albuterol inhaler. At this visit, this patient’s temperature is 98.6°F (37.0°C), pulse is 69/min, blood pressure is 119/61 mmHg, and respirations are 13/min. Cardiopulmonary exam is unremarkable, and the uterine fundus is just palpable at the pelvic brim. Pelvic exam reveals normal female external genitalia, a closed and slightly soft cervix, a 12-week-size uterus, and no adnexal masses. Which of the following is the best method for evaluating for possible cervical incompetence in this patient?
A. Transabdominal ultrasound in the first trimester
B. Transvaginal ultrasound in the first trimester
C. Serial transvaginal ultrasounds starting at 16 weeks gestation
D. Transabdominal ultrasound at 18 weeks gestation
E. Transvaginal ultrasound at 18 weeks gestation (Correct Answer)
Explanation: ***Transvaginal ultrasound at 18 weeks gestation***
- A history of **LEEP** is a risk factor for **cervical incompetence** and warrants screening with transvaginal ultrasound.
- The optimal timing for **cervical length** screening in women with a history of cervical procedures is typically between **18 and 24 weeks gestation**, as the risk of cervical shortening usually manifests during this period.
*Transabdominal ultrasound in the first trimester*
- **Transabdominal ultrasound** is generally not ideal for precise **cervical length measurement** due to potential shadowing from the fetus or maternal obesity.
- **First-trimester cervical length measurement** is not typically recommended for routine screening of cervical incompetence, as changes are less pronounced early in pregnancy.
*Transvaginal ultrasound in the first trimester*
- While more accurate than transabdominal, **first-trimester transvaginal ultrasound** for cervical length is not standard for predicting cervical incompetence.
- Significant cervical shortening due to incompetence often occurs later in the second trimester, so early screening may miss the condition.
*Serial transvaginal ultrasounds starting at 16 weeks gestation*
- While **serial transvaginal ultrasounds** starting at 16 weeks can be part of a management plan for high-risk patients, the most critical single assessment typically occurs at **18-24 weeks**.
- Starting serial scans too early may not be necessary if the cervix is long and closed at the initial key screening, unless there are other strong indications.
*Transabdominal ultrasound at 18 weeks gestation*
- Similar to first-trimester transabdominal ultrasound, **transabdominal imaging** at 18 weeks is generally **less accurate** than transvaginal for measuring cervical length.
- **Transvaginal ultrasound** offers a clearer and more precise view of the cervix, which is crucial for assessing potential shortening or funneling.
Question 48: A 25-year-old G2P1 woman at 12 weeks gestational age presents to the office to discuss the results of her routine prenatal screening labs, which were ordered during her 1st prenatal visit. She reports taking a daily prenatal vitamin but no other medications. She complains of mild fatigue and appears pale on exam. Her complete blood count (CBC) shows the following:
Hemoglobin (Hb) 9.5 g/dL
Hematocrit 29%
Mean corpuscular volume (MCV) 75 µm3
Which of the following are the most likely hematologic states of the patient and her fetus?
A. Iron deficiency anemia in both the mother and the fetus
B. Iron deficiency anemia in the mother; normal Hb levels in the fetus (Correct Answer)
C. Pernicious anemia in the mother; normal Hb levels in the fetus
D. Physiologic anemia in the mother; normal Hb levels in the fetus
E. Folate deficiency anemia in both the mother and the fetus
Explanation: ***Iron deficiency anemia in the mother; normal Hb levels in the fetus***
- The mother's lab values (Hb 9.5 g/dL, MCV 75 µm3) indicate **microcytic, hypochromic anemia**, consistent with **iron deficiency anemia**.
- The fetus prioritizes iron uptake, even in cases of severe maternal iron deficiency, meaning the **fetal hemoglobin levels** are typically normal unless maternal iron deficiency is profound and prolonged.
*Iron deficiency anemia in both the mother and the fetus*
- While the mother clearly has **iron deficiency anemia**, the fetus generally maintains **normal hemoglobin levels** by actively drawing iron from the mother, even at her expense.
- Fetal iron deficiency leading to anemia is rare unless maternal deficiency is extremely severe and prolonged, which is not indicated here.
*Pernicious anemia in the mother; normal Hb levels in the fetus*
- **Pernicious anemia** (vitamin B12 deficiency) typically presents as **macrocytic anemia** (high MCV), which contradicts the patient's MCV of 75 µm3 (microcytic).
- Although the fetus would likely have normal Hb levels in maternal pernicious anemia, the mother's lab findings do not support this diagnosis.
*Physiologic anemia in the mother; normal Hb levels in the fetus*
- **Physiologic anemia of pregnancy** is caused by a disproportionate increase in plasma volume compared to red blood cell mass, resulting in **dilutional anemia**, but usually with a **normal MCV**.
- The patient's **low MCV (75 µm3)** indicates a microcytic anemia, which is not characteristic of physiologic anemia of pregnancy.
*Folate deficiency anemia in both the mother and the fetus*
- **Folate deficiency anemia** is a type of **macrocytic anemia** (high MCV), which is inconsistent with the patient's MCV of 75 µm3.
- While severe maternal folate deficiency can affect the fetus, the maternal blood picture does not support this diagnosis.
Question 49: A 23-year-old woman presents to the emergency department with burning and increased urinary frequency. The patient states that her symptoms started yesterday and have been worsening despite hydrating well. The patient is generally healthy, does not smoke or drink alcohol, and is 10 weeks pregnant. She is currently taking folate, iron, and a multivitamin. Her temperature is 98.1°F (36.7°C), blood pressure is 122/83 mmHg, pulse is 83/min, respirations are 13/min, and oxygen saturation is 98% on room air. Physical exam is notable for an absence of costovertebral angle tenderness and mild discomfort to palpation of the lower abdomen. An initial urine dipstick is notable for the presence of leukocytes, bacteria, and nitrates. Which of the following is the best treatment for this patient?
A. Doxycycline
B. Ceftriaxone
C. Trimethoprim-sulfamethoxazole
D. Amoxicillin-clavulanate (Correct Answer)
E. Ciprofloxacin
Explanation: ***Amoxicillin-clavulanate***
- This patient presents with symptoms and urine dipstick findings consistent with a **urinary tract infection (UTI)**. Given her **pregnancy**, treatment must be safe for the fetus. **Amoxicillin-clavulanate** is a penicillin-class antibiotic that is generally considered safe during pregnancy (Category B).
- The presence of **leukocytes, bacteria, and nitrites** on urine dipstick strongly supports the diagnosis of UTI, and amoxicillin-clavulanate effectively targets common uropathogens like *E. coli*.
*Doxycycline*
- **Doxycycline** is a **tetracycline antibiotic** that is **contraindicated in pregnancy** (Category D) due to the risk of fetal teeth discoloration and inhibition of bone growth.
- While effective against many bacteria, its teratogenic potential makes it an inappropriate choice for this pregnant patient.
*Ceftriaxone*
- **Ceftriaxone** is a broad-spectrum cephalosporin that is generally safe in pregnancy (Category B) but is typically reserved for more severe infections, such as pyelonephritis, or when oral antibiotics are not tolerated.
- For a simple cystitis in pregnancy, an oral antibiotic is preferred, and ceftriaxone is usually given parenterally.
*Trimethoprim-sulfamethoxazole*
- **Trimethoprim-sulfamethoxazole** (TMP-SMX) is contraindicated in the **first trimester** of pregnancy due to its **folate antagonist** effects, which can increase the risk of neural tube defects.
- Although it is generally safe in the second and early third trimesters, this patient is in her first trimester (10 weeks pregnant), making it an inappropriate choice.
*Ciprofloxacin*
- **Ciprofloxacin** is a **fluoroquinolone antibiotic** that is generally **contraindicated in pregnancy** (Category C) due to theoretical concerns of cartilage damage in the fetus, though human data are reassuring.
- It is usually avoided unless other safer antibiotics are ineffective or contraindicated.
Question 50: A 29-year-old, gravida 1 para 0, at 10 weeks' gestation comes to the physician for progressively worsening emesis, nausea, and a 2-kg (4.7-lb) weight loss over the past 2 weeks. The most recent bouts of vomiting occur around 3–4 times a day, and she is stressed that she had to take a sick leave from work the last 2 days. She is currently taking ginger and vitamin B6 with limited relief. Her pulse is 80/min, blood pressure is 100/60 mmHg, and respiratory rate is 13/min. Orthostatic vital signs are within normal limits. The patient is alert and oriented. Her abdomen is soft and nontender. Urinalysis shows no abnormalities. Her hematocrit is 40%. Venous blood gas shows:
pH 7.43
pO2 42 mmHg
pCO2 54 mmHg
HCO3- 31 mEq/L
SO2 80%
In addition to oral fluid resuscitation, which of the following is the most appropriate next step in management?
A. Addition of doxylamine (Correct Answer)
B. Monitoring and stress counseling
C. Administration of supplemental oxygen
D. Trial of metoclopramide
E. IV fluid resuscitation
Explanation: ***Addition of doxylamine***
- The patient exhibits features of **hyperemesis gravidarum**, including significant **weight loss**, frequent vomiting despite home remedies, and mild **alkalosis** (elevated pH, pCO2, HCO3- suggesting metabolic alkalosis from vomiting with respiratory compensation; typically, hyperemesis might lead to metabolic alkalosis, but here, the pCO2 is high indicating some respiratory compensation or mild respiratory acidosis might be overshadowed by metabolic alkalosis).
- Given that she has tried ginger and vitamin B6 with limited success for her severe symptoms, the next appropriate step is to add **doxylamine**, an antihistamine with antiemetic properties, typically combined with pyridoxine (vitamin B6) for hyperemesis gravidarum.
*Monitoring and stress counseling*
- This patient's symptoms are beyond typical "morning sickness," given the **2-kg weight loss** and frequent vomiting impacting her work, indicating significant physiological distress.
- While stress can exacerbate symptoms, the primary issue is a severe physical condition requiring medical intervention rather than just counseling.
*Administration of supplemental oxygen*
- The patient's **pO2 is 42 mmHg**, which is a normal venous pO2 and does not indicate hypoxemia requiring supplemental oxygen. **Arterial pO2** is typically much higher.
- Her **respiratory rate is 13/min**, and she is alert and oriented, suggesting adequate oxygenation and ventilation clinically.
*Trial of metoclopramide*
- Metoclopramide is an **antiemetic** that can be used in hyperemesis gravidarum, but it is typically reserved for cases where **doxylamine/pyridoxine** combinations are insufficient.
- It also carries a risk of **extrapyramidal side effects**, making it a second-line or third-line agent after safer options have been tried.
*IV fluid resuscitation*
- While the patient has significant vomiting and weight loss, her vital signs are relatively stable (no orthostatic changes, BP 100/60 mmHg), and her hematocrit is 40%, indicating **no severe dehydration** requiring immediate intravenous fluids.
- The question specifically asks for the *next step* in addition to *oral fluid resuscitation*, implying that oral rehydration is already being considered or attempted, and a pharmaceutical intervention is needed.
