USMLE Step 3
Practice Test 4 for USMLE Step 3: real questions and explanations from the Varsity Tutors practice-test pool.
0%
0 / 25 answered
Question 1 of 25
A 62-year-old man on maintenance hemodialysis three times weekly has a hemoglobin of 9.8 g/dL despite a stable dose of epoetin alfa for the past 3 months. His blood pressure is well-controlled. Further laboratory studies are ordered to evaluate for iron deficiency. Which of the following sets of results would be most consistent with absolute iron deficiency requiring intravenous iron supplementation in this patient?
Question Navigator
A 62-year-old man on maintenance hemodialysis three times weekly has a hemoglobin of 9.8 g/dL despite a stable dose of epoetin alfa for the past 3 months. His blood pressure is well-controlled. Further laboratory studies are ordered to evaluate for iron deficiency. Which of the following sets of results would be most consistent with absolute iron deficiency requiring intravenous iron supplementation in this patient?
Explanation: In patients with end-stage renal disease on hemodialysis, the targets for iron status are different from the general population due to chronic inflammation and ESA therapy. Absolute iron deficiency, which indicates depleted iron stores, is typically defined by a transferrin saturation (TSAT) of ≤20% and a ferritin level of <100 ng/mL (or <200 ng/mL in some guidelines). Functional iron deficiency (ferritin >200 ng/mL, TSAT <20%) indicates adequate stores but insufficient mobilization. The values in choice B (Ferritin 80, TSAT 15%) clearly indicate absolute iron deficiency, which is the strongest indication for IV iron therapy to improve ESA response.
A 34-year-old woman presents with newly diagnosed hypertension. Her blood pressure is 170/105 mmHg. She has no family history of hypertension, a BMI of 22 kg/m², and does not use tobacco. On examination, a faint bruit is audible just to the right of the umbilicus. Initial laboratory studies, including serum electrolytes and creatinine, are within normal limits. Which of the following is the most appropriate next diagnostic test?
Explanation: The patient's presentation of severe, new-onset hypertension at a young age, particularly in a female, along with an abdominal bruit, is highly suspicious for secondary hypertension due to renal artery stenosis caused by fibromuscular dysplasia (FMD). FMD is a non-atherosclerotic, non-inflammatory vascular disease that most commonly affects the renal and internal carotid arteries. CT angiography or MR angiography of the renal arteries is the preferred non-invasive imaging modality to visualize the characteristic 'string of beads' appearance of FMD.
A 29-year-old G2P1 presents for interpregnancy counseling. Her first pregnancy resulted in a spontaneous preterm birth at 32 weeks' gestation. She has no history of uterine surgery or cervical procedures. She has no other significant medical history and wishes to conceive again in the next year. She asks what can be done to reduce her risk of another preterm birth.
Explanation: For women with a singleton pregnancy and a history of a prior spontaneous preterm birth, progesterone supplementation has been shown to reduce the risk of recurrence. Weekly intramuscular injections of 17-alpha-hydroxyprogesterone caproate (17-OHPC), typically started between 16 and 20 weeks and continued until 36 weeks, is a standard evidence-based intervention. (A) Prophylactic antibiotics have not been shown to prevent recurrent preterm birth in the absence of a specific infection. (C) Cerclage is indicated for patients with a history of cervical insufficiency (e.g., painless second-trimester loss) or a short cervix found on ultrasound during the current pregnancy. It is not indicated based solely on a history of spontaneous preterm birth. (D) Bed rest has been studied and has not been shown to be effective in preventing preterm birth; it may also increase the risk of venous thromboembolism.
A 55-year-old woman with autosomal dominant polycystic kidney disease has a progressively declining eGFR, which is now 19 mL/min/1.73m². She is currently asymptomatic and is being managed in a nephrology clinic. She is interested in in-center hemodialysis as her future renal replacement therapy.
Explanation: For patients planning to start hemodialysis, placement of an arteriovenous (AV) fistula is the preferred access method due to lower rates of infection and thrombosis and better long-term patency compared to grafts or catheters. An AV fistula requires 3-6 months to mature. Therefore, referral to a vascular surgeon for evaluation and placement should occur well in advance of the need for dialysis, typically when the eGFR falls below 20-25 mL/min/1.73m².
A 9-year-old girl was diagnosed with celiac disease one year ago via small bowel biopsy after having positive serology (markedly elevated tTG-IgA). She and her family have worked with a dietitian and report strict adherence to a gluten-free diet. Her gastrointestinal symptoms have resolved, and her growth has improved. However, a follow-up tTG-IgA level remains moderately elevated.
What is the most likely reason for the persistently elevated serology?
Explanation: In a patient with celiac disease who is clinically improving but has persistently elevated serology after a year on a gluten-free diet, the most common cause is ongoing, unintentional gluten ingestion. This can occur through cross-contamination in the kitchen, misreading food labels, or eating foods with hidden gluten. A detailed dietary review is necessary. While antibody levels can take 1-2 years to normalize in some, persistent elevation warrants investigation for non-adherence. Refractory disease is very rare in children.
History & Lifestyle: 25-year-old woman at wellness visit. • Sexually active; condoms inconsistent. • Not pregnant. • No prior hepatitis C screening; no injection drug use. Family History: Noncontributory. Preventive Care Review: Up to date on Pap; wants recommended infectious disease screening based on age cohort.
Based on the vignette, which screening test is recommended for this patient?
Explanation: This question tests understanding of preventive care and screening in primary care (USMLE Step 3). Preventive care involves applying evidence-based guidelines to recommend appropriate screenings and lifestyle modifications. In this vignette, the 25-year-old woman wants age-based infectious disease screening, the recommended test is one-time hepatitis C antibody screening, aligning with USPSTF guidelines. Choice A is correct because it matches USPSTF recommendations for one-time screening in adults aged 18-79. Choice D is incorrect because it suggests no screening until age 50, ignoring the broad age range. For teaching, emphasize the importance of staying updated with guidelines, identifying patient-specific risk factors, and prioritizing screenings that provide the greatest benefit. Encourage students to practice applying guidelines in varied scenarios to build confidence in clinical decision-making.
A 38-year-old man is admitted to the ICU after a severe motor vehicle collision resulting in a pelvic fracture, splenic laceration requiring splenectomy, and bilateral pulmonary contusions. On ICU day 4, he is mechanically ventilated with a P/F ratio of 120. He has required 12 units of packed red blood cells. His creatinine is 2.5 mg/dL (baseline 0.9), and he requires norepinephrine. A medical student asks which single factor is most likely to determine his long-term outcome if he survives this acute phase.
Which of the following best predicts the patient's long-term morbidity and mortality after surviving this critical illness?
Explanation: While all factors contribute to morbidity, acute kidney injury (AKI) during critical illness is a powerful independent predictor of long-term mortality, development of chronic kidney disease (CKD), and cardiovascular events, even if renal function appears to recover at hospital discharge. The severity of AKI correlates with the magnitude of these long-term risks. The duration of mechanical ventilation (B) and volume of transfusions (C) are associated with short-term complications and length of stay but are less predictive of long-term mortality than AKI. Post-ICU cognitive impairment (D) is a significant morbidity but does not carry the same strong, independent association with long-term mortality as the development of severe AKI.
Two days after knee surgery, a 45-year-old woman on prophylactic LMWH develops sudden dyspnea and syncope; BP 82/50, HR 128; bedside echo shows RV dilation. Which intervention is most critical at this stage of care?
Explanation: This question tests USMLE Step 3 competencies in postoperative and post-trauma care, focusing on management strategies and complication prevention. Understanding the principles of postoperative care involves recognizing common complications and appropriate interventions based on clinical guidelines. In this scenario, the patient presents with sudden dyspnea, syncope, hypotension, tachycardia, and RV dilation on echo two days after knee surgery, necessitating consideration of massive pulmonary embolism management. Choice A is correct because it directly addresses the patient's current clinical needs, aligning with best practices for thrombolysis in hemodynamically unstable PE. Choice B is incorrect because it reflects a common misconception, such as delaying for outpatient imaging, leading to inadequate management and mortality risk. To enhance learning, students should focus on mastering complication recognition and prioritization of care, utilizing scenario-based practice to reinforce decision-making skills and prevent common clinical pitfalls.
A 30-year-old G1P1 who is 4 weeks postpartum and exclusively breastfeeding presents with a 2-day history of right breast pain, swelling, and redness. She also reports fever and chills. Her temperature is 38.8°C (101.8°F). Examination reveals a 5-cm, indurated, erythematous, and tender area in the upper outer quadrant of the right breast. There is no palpable fluctuance.
Explanation: The patient's presentation is classic for lactational mastitis. Management involves antibiotics targeting the most common pathogen, Staphylococcus aureus, and effective milk removal. Dicloxacillin is a first-line agent. It is crucial to advise the patient to continue breastfeeding or pumping from the affected breast to prevent milk stasis, which can lead to abscess formation. (A) Cessation of breastfeeding will worsen milk stasis and increase the risk of complications like a breast abscess. (C) A breast ultrasound is not needed for an initial diagnosis of mastitis. It is indicated if a breast abscess is suspected (e.g., presence of fluctuance or failure to improve after 48-72 hours of antibiotics). (D) Trimethoprim-sulfamethoxazole is not a first-line agent and should be used with caution in breastfeeding, especially with newborn infants, due to concerns about kernicterus.
A 59-year-old man has CKD stage 3b for 5 years from diabetes; he limits sodium and takes losartan 100 mg daily, empagliflozin 10 mg daily, metformin 500 mg twice daily, and atorvastatin 40 mg nightly. He reports no symptoms. BP is 118/66 mm Hg. Exam is normal. Labs: creatinine 2.1 mg/dL, eGFR 33 mL/min/1.73 m², K 4.8 mEq/L, HCO3 24 mEq/L. Urine albumin-to-creatinine ratio is 120 mg/g. What complication is this patient at highest risk for?
Explanation: This question tests chronic kidney disease management skills, specifically focusing on identifying cardiovascular risks in diabetic CKD patients. Chronic kidney disease management involves regular monitoring of renal function, adjusting medications based on kidney status, and managing complications like anemia and electrolyte imbalances. In the presented vignette, the patient's diabetes, CKD, and albuminuria place him at high risk for cardiovascular events. The correct choice, cardiovascular disease events related to CKD, accurately reflects current guidelines for risk assessment in CKD stage 3b, demonstrating the student's understanding of appropriate clinical interventions. A common distractor may suggest nephrolithiasis, which is not supported by labs, highlighting a frequent misconception. To improve understanding, students should focus on guidelines for CVD in CKD, regularly review risk factors, and practice stratifying patients for preventive care.
A 9-month-old infant is brought for a well-child check. He was born full-term and has been exclusively breastfed. The mother began introducing pureed fruits and vegetables one month ago. She reports he seems more pale and less active over the past few weeks. His growth has tracked along the 25th percentile for weight and 40th for length. Physical examination is unremarkable except for pale conjunctivae.
In addition to routine care and counseling, which of the following is the most appropriate next step in management?
Explanation: This infant has multiple risk factors for iron deficiency anemia (exclusive breastfeeding beyond 6 months without iron supplementation) and clinical signs (pallor, decreased activity). Universal screening for anemia is recommended between 9 and 12 months, but this infant's symptoms warrant diagnostic testing with a complete blood count and ferritin level. Simply starting iron-fortified cereal without confirming the diagnosis is insufficient given the clinical signs. Vitamin D supplementation is important but does not address the concern for anemia. Reassurance is inappropriate as it dismisses clear signs of a potential medical problem.
An 82-year-old woman with dementia undergoes a hip hemiarthroplasty for a femoral neck fracture. On postoperative day 2, she becomes acutely agitated, disoriented to time and place, and is attempting to pull out her IV lines. Her vital signs are stable, oxygen saturation is 98% on room air, and a recent metabolic panel is unremarkable. Non-pharmacologic interventions like reorientation have failed.
Explanation: This patient is experiencing postoperative delirium, a common complication in elderly surgical patients. After ruling out and correcting underlying medical causes (hypoxia, electrolyte imbalance, infection, etc.), management focuses on non-pharmacologic strategies. When these fail and the patient's agitation poses a safety risk, a low-dose antipsychotic agent like haloperidol is the preferred pharmacologic treatment. Benzodiazepines (e.g., lorazepam) should be avoided as they can worsen delirium in the elderly (unless treating alcohol withdrawal). Restraints are a last resort and can exacerbate agitation.
A 76-year-old man with a 5-year history of Alzheimer's disease is brought to the office by his wife. Over the past 6 months, he has developed increasing agitation and verbal aggression, particularly in the evenings. He has no delusions or hallucinations. He is currently taking donepezil 10 mg daily and memantine 10 mg twice daily. His wife is asking for medication to help manage his behavior as it is becoming difficult for her to care for him at home. Physical examination is unchanged from his previous visit.
In addition to non-pharmacologic interventions, which of the following is the most appropriate next step in the pharmacologic management of this patient's agitation?
Explanation: The patient is experiencing behavioral and psychological symptoms of dementia (BPSD), specifically agitation. First-line management is always non-pharmacologic interventions. When pharmacotherapy is required for agitation in the absence of psychosis, selective serotonin reuptake inhibitors (SSRIs) such as citalopram or sertraline have the best evidence for efficacy and safety. Atypical antipsychotics have a black box warning for increased mortality in elderly patients with dementia and are typically reserved for severe symptoms, particularly psychosis. Benzodiazepines should be avoided due to risks of paradoxical agitation, falls, and worsening confusion. Increasing the donepezil dose is unlikely to improve agitation.
A 74-year-old man with idiopathic pulmonary fibrosis (IPF) diagnosed one year ago presents to the emergency department with a 2-week history of progressively worsening dyspnea on exertion and a dry cough. He is currently on nintedanib. His oxygen saturation on room air is 86%, down from his baseline of 93%. A high-resolution CT scan of the chest shows new, diffuse bilateral ground-glass opacities superimposed on his known pattern of usual interstitial pneumonia. Sputum cultures, viral panels, and blood cultures are negative. Echocardiogram is unchanged.
What is the most appropriate next step in this patient's management?
Explanation: This patient's presentation is highly suggestive of an acute exacerbation of IPF, defined as an acute, clinically significant respiratory deterioration of unidentifiable cause. After excluding other causes like infection (negative cultures) and heart failure (unchanged echo), the standard of care for a suspected acute exacerbation of IPF is treatment with high-dose systemic corticosteroids (e.g., pulse-dose methylprednisolone). While supportive care and ruling out infection are crucial, corticosteroids are the primary treatment for the underlying inflammatory process of the exacerbation. Antifibrotic therapy (nintedanib) is not adjusted during an acute exacerbation, and there is no evidence for diuretics.
A 29-year-old G1P1 woman presents for her 6-week postpartum visit. Her pregnancy was complicated by gestational diabetes mellitus (GDM), which was well-controlled with diet. Her fingerstick blood glucose levels normalized after delivery. She is currently asymptomatic.
What is the most appropriate screening test for this patient to assess her long-term risk of developing type 2 diabetes?
Explanation: When you encounter a patient with a history of gestational diabetes mellitus (GDM), think about postpartum diabetes screening guidelines. Women with GDM have a significantly increased risk of developing type 2 diabetes later in life, making appropriate screening crucial. The correct approach is option D: a 75-gram, 2-hour oral glucose tolerance test (OGTT) between 4 and 12 weeks postpartum. This is the gold standard recommended by major organizations including the American Diabetes Association and ACOG. The OGTT is more sensitive than other tests for detecting glucose intolerance and can identify both diabetes and prediabetes in the postpartum period when insulin resistance patterns are stabilizing. Option A is incorrect because waiting until one year is too late for initial postpartum screening. Early detection allows for lifestyle interventions and closer monitoring during the critical postpartum period. Option B is wrong because hemoglobin A1c at 6 weeks postpartum can be misleading. Pregnancy-related physiological changes, including altered red blood cell turnover and the recent normalization of glucose levels, make A1c less reliable in the immediate postpartum period. Option C represents a dangerous misconception. While glucose levels normalize after delivery, the underlying insulin resistance that caused GDM indicates a substantially elevated lifetime risk for type 2 diabetes—not a return to baseline risk. Remember this pattern: GDM history = mandatory postpartum OGTT between 4-12 weeks. This early screening window allows for timely identification of persistent glucose intolerance and initiation of preventive measures.
A primary care clinic implemented a new workflow to improve the rate of depression screening. A run chart is created, plotting the percentage of eligible patients screened each month. The pre-intervention median screening rate was 30%. In the 10 months following the intervention, the monthly screening rates were: 45%, 48%, 42%, 55%, 51%, 49%, 53%, 58%, 56%, 60%. How should this data be interpreted?
Explanation: A run chart is a simple tool to visualize data over time and detect non-random patterns. One of the key rules for identifying a statistically significant change (a 'signal') is a 'shift,' defined as eight or more consecutive points all above or all below the median. In this case, all 10 post-intervention data points are above the pre-intervention median of 30%. This meets the criteria for a shift, indicating that the process has changed in a non-random way and the improvement is likely due to the new workflow.
A 60-year-old man with no prior medical care presents to the emergency department with confusion and lethargy. Laboratory studies reveal a BUN of 190 mg/dL and serum creatinine of 16.5 mg/dL. He is diagnosed with end-stage renal disease and scheduled for his first hemodialysis session. Near the end of the 2.5-hour session, he becomes agitated, complains of a severe headache, and then experiences a generalized tonic-clonic seizure. This patient's acute neurologic deterioration is best explained by which of the following mechanisms?
Explanation: This patient is experiencing dialysis disequilibrium syndrome (DDS), a rare but serious complication of initial hemodialysis in patients with severe azotemia. The pathophysiology involves the rapid removal of urea from the blood. Because the blood-brain barrier is relatively impermeable to urea, a significant osmotic gradient develops between the plasma and the brain tissue. This gradient drives water into the brain, causing cerebral edema, which leads to neurological symptoms including headache, confusion, and seizures. To prevent DDS, initial dialysis sessions in severely uremic patients are typically shorter and less efficient.
A 34-year-old G2P2 with a history of chronic hypertension presents for a routine visit 3 months postpartum. Her last pregnancy was complicated by preeclampsia with severe features. Her blood pressure is well-controlled at 135/85 mm Hg on lisinopril. She states she would like to become pregnant again in the next 1-2 years. She is currently using condoms for contraception.
Explanation: This patient requires interpregnancy care to optimize her health for a future pregnancy. Lisinopril, an ACE inhibitor, is teratogenic and contraindicated in pregnancy. Since she is planning a future pregnancy, it should be discontinued and replaced with an agent that is safe for use during pregnancy. Labetalol, a beta-blocker, is a first-line antihypertensive for use in pregnancy and is an appropriate choice for pre-conception management. (A) Continuing a known teratogen in a woman planning pregnancy is inappropriate. (C) Discontinuing antihypertensives would lead to uncontrolled hypertension, which carries significant maternal and fetal risks in a subsequent pregnancy. (D) While sometimes used, thiazide diuretics like hydrochlorothiazide are generally considered second-line agents during pregnancy due to concerns about plasma volume contraction.
A 62-year-old man with hyperlipidemia and pre-diabetes (A1c 6.1%) presents for a follow-up visit. He has no history of cardiovascular disease. His blood pressure is 135/85 mm Hg. His 10-year ASCVD risk is calculated to be 15%. He asks if he should start taking a daily low-dose aspirin to prevent a heart attack.
What is the most appropriate response?
Explanation: The 2022 USPSTF guidelines recommend against initiating low-dose aspirin for the primary prevention of cardiovascular disease in adults 60 years or older (Grade D recommendation). While older guidelines may have supported aspirin use in this patient, current evidence suggests that the risk of bleeding outweighs the potential cardiovascular benefit when initiating aspirin in this age group.
A 48-year-old woman is found to have a pulmonary embolism on CT angiography in the emergency department. She is hemodynamically stable. She is started on a direct oral anticoagulant (DOAC) and is deemed safe for outpatient management. She has a primary care physician whom she sees regularly.
In coordinating this patient's transition from the emergency department to outpatient care, which of the following is the most critical element to communicate to the primary care physician?
Explanation: When coordinating care transitions for patients with acute conditions like pulmonary embolism, effective communication centers on actionable information that directly impacts ongoing patient safety and management decisions. Option D is correct because it provides the essential details the primary care physician needs to safely continue this patient's care. The specific DOAC matters because each has different dosing, monitoring requirements, and drug interactions. Duration of therapy depends on whether this is a provoked or unprovoked PE, affecting long-term management decisions. Follow-up urgency helps the PCP prioritize scheduling and understand any red flags to monitor. Option A is incorrect because while clot burden affects initial treatment decisions, the detailed radiological description doesn't change the PCP's ongoing management once stable outpatient therapy is initiated. Option B represents diagnostic information that was useful in the ED for risk stratification, but these scores don't guide the PCP's follow-up care plan. Option C, while reassuring, doesn't impact the anticoagulation regimen or follow-up schedule that the PCP needs to manage. The other options represent "nice to know" information, but they don't enable the receiving physician to provide safe, appropriate care. Poor communication about anticoagulation specifics can lead to medication errors, inappropriate duration of therapy, or delayed recognition of complications. Remember: In care transition questions, focus on what the receiving provider needs to act on, not just what happened during the acute episode. Actionable medication details and follow-up plans always take priority over diagnostic process information.
A 68-year-old man is transferred to the medical floor after a 2-week ICU stay for a severe gastrointestinal bleed requiring multiple transfusions. He is now hemodynamically stable. The ICU discharge summary mentions an incidental finding on a chest x-ray, performed for central line confirmation, of a 2-cm, well-circumscribed nodule in the left lower lobe. This finding was not previously known and was not addressed further in the ICU.
What is the most appropriate action by the ward physician regarding this finding?
Explanation: A key responsibility of the ward team during an ICU-to-ward transition is ensuring that important but non-acute issues and incidental findings are not lost to follow-up. A new 2-cm lung nodule is a potentially serious finding that requires further investigation. The most appropriate action is to communicate the finding to the patient and arrange for appropriate outpatient follow-up, typically with a repeat CT scan in a specified timeframe or a pulmonology consultation. Deferring the discussion, providing false reassurance, or ordering an advanced imaging test like a PET scan without first obtaining a diagnostic CT would be inappropriate.
A 26-year-old man with a known history of Crohn disease presents with persistent, non-painful drainage from a site near his anus. On examination, there is a single external opening 4 cm from the anal verge with a palpable cord-like tract. An MRI of the pelvis confirms a complex, high transsphincteric fistula. He is currently only taking mesalamine.
Which of the following is the most appropriate long-term medical therapy for this condition?
Explanation: Complex perianal fistulas are a serious complication of Crohn disease and require aggressive medical management to promote healing and prevent complications. Anti-TNF agents (e.g., infliximab, adalimumab) are the cornerstone of therapy for fistulizing Crohn disease and have been shown to induce and maintain fistula closure. Antibiotics can be used as an adjunct or for associated abscesses but are not effective as long-term monotherapy for fistula healing. Surgical fistulotomy carries a high risk of incontinence with a high (transsphincteric) fistula. Budesonide has minimal systemic effect and is not effective for fistulizing disease.
History & Lifestyle: 50-year-old man for preventive visit. • Smokes 1 pack/day; sedentary; BMI 32. • No history of diabetes; last glucose unknown. Family History: Mother with type 2 diabetes; father MI at 57. Preventive Care Review: BP 136/88. No labs in years. He asks about diabetes screening. No symptoms of hyperglycemia.
Based on the vignette, which screening test is recommended for this patient?
Explanation: This question tests understanding of preventive care and screening in primary care (USMLE Step 3). Preventive care involves applying evidence-based guidelines to recommend appropriate screenings and lifestyle modifications. In this vignette, the 50-year-old obese man with risk factors asks about diabetes screening, the recommended test is screening for type 2 diabetes with HbA1c, aligning with USPSTF guidelines. Choice A is correct because it matches USPSTF recommendations for screening adults aged 35-70 who are overweight or obese. Choice C is incorrect because it suggests no screening until symptoms, ignoring asymptomatic detection benefits. For teaching, emphasize the importance of staying updated with guidelines, identifying patient-specific risk factors, and prioritizing screenings that provide the greatest benefit. Encourage students to practice applying guidelines in varied scenarios to build confidence in clinical decision-making.
A 66-year-old man with a history of COPD, hypertension, and type 2 diabetes is discharged from the hospital following a 1-week admission for a COPD exacerbation. At his first post-discharge follow-up appointment with his primary care physician 4 days later, a review of his discharge summary and the patient's pill bottles reveals a discrepancy: the hospitalist discontinued his pre-admission lisinopril and started losartan, but the patient's pharmacy refilled the lisinopril and he has been taking both medications.
Which of the following is the most appropriate immediate action to address this medication discrepancy?
Explanation: The most critical immediate action is to resolve the discrepancy to prevent patient harm from dual renin-angiotensin system blockade (hyperkalemia, hypotension, acute kidney injury). The primary care physician should lead a thorough medication reconciliation, comparing pre-admission, hospital, and post-discharge lists. The physician must then create a single, definitive list, explain the changes to the patient, update the pharmacy record, and ensure the patient understands which medications to take and which to discard. While contacting the hospitalist or a pharmacist are potential steps, the immediate responsibility for patient safety in the ambulatory setting lies with the PCP who has identified the error.
A 35-year-old woman with a known history of left-sided ulcerative colitis, maintained on high-dose oral mesalamine, presents to her primary care physician with a 3-week history of increased stool frequency (from 2 to 6 per day), urgency, and intermittent bloody stools. She is hemodynamically stable and her C-reactive protein is 15 mg/L (normal <5 mg/L).
Which of the following is the most appropriate next step in her outpatient management?
Explanation: When you encounter a patient with known ulcerative colitis presenting with worsening symptoms, you need to assess disease severity and choose appropriate step-up therapy. This patient shows clear signs of a mild-to-moderate flare: increased stool frequency, urgency, bloody stools, and elevated inflammatory markers, but remains hemodynamically stable. The correct approach is adding oral prednisone (D). Since her current mesalamine therapy isn't controlling the flare, you need to escalate to corticosteroids. Oral prednisone is appropriate for mild-to-moderate flares in hemodynamically stable outpatients. A 4-week course allows sufficient time for induction of remission while minimizing long-term steroid exposure. Option A is incorrect because broad-spectrum antibiotics aren't indicated for UC flares unless there's clear evidence of superimposed infection, which isn't suggested here. Option B simply increasing mesalamine dose is insufficient since she's already on high-dose therapy and experiencing breakthrough symptoms - this represents treatment failure requiring escalation. Option C recommends inpatient IV corticosteroids, but this patient doesn't meet criteria for severe colitis (she's hemodynamically stable with moderate symptoms), making outpatient oral therapy appropriate. The key distinction is recognizing mild-moderate versus severe UC flares. Severe flares require hospitalization and IV steroids, while mild-moderate flares can be managed outpatient with oral corticosteroids. Watch for hemodynamic stability, frequency of bloody stools, and overall clinical picture to guide this decision. Remember the step-wise approach: mesalamine → oral steroids → IV steroids/immunosuppressants.