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A 45-year-old man presents to the emergency department with sudden-onset, excruciating, diffuse abdominal pain that began 2 hours ago. He has a history of untreated peptic ulcer disease and frequently uses over-the-counter nonsteroidal anti-inflammatory drugs. On physical examination, he appears acutely ill, is diaphoretic, and has a heart rate of 115/min. His abdomen is diffusely rigid with involuntary guarding and severe rebound tenderness. Arrange the following management steps in the most appropriate chronological sequence for this patient.

A 31-year-old man comes to the outpatient psychiatry clinic reporting a 2-month history of sudden, terrifying episodes of "feeling like I am going to die." During these episodes, which peak within 10 minutes, he experiences intense palpitations, diaphoresis, shortness of breath, and chest tightness. He has had six of these episodes in the past month. Recently, he has stopped taking the subway to work because he fears being unable to escape if an episode occurs. The patient has no significant past medical history and his physical examination, including an electrocardiogram, is normal. Upon further psychiatric history, the patient describes a 3-week period in his mid-twenties when he felt "invincible," slept only 2 hours a night, spoke incessantly, and aggressively invested his life savings into a fraudulent scheme. He was hospitalized during that time but currently takes no medications. Which of the following is the most appropriate next step in management for this patient?

A $45$-year-old man is brought to the emergency department after a high-speed motorcycle collision. On arrival, he is confused and diaphoretic.

Temperature is $35.8^\circ\text{C}$ ($96.4^\circ\text{F}$), blood pressure is $78/40\text{ mmHg}$, heart rate is $135/\text{min}$, and respiratory rate is $28/\text{min}$. Primary survey reveals a patent airway and equal breath sounds bilaterally. The abdomen is distended with diffuse tenderness to palpation. Pelvic compression produces gross mechanical instability. Bilateral lower extremities are cool with weak dorsalis pedis pulses.

A pelvic binder is immediately applied, and massive transfusion protocol is initiated. Following the rapid administration of $2\text{ units}$ of uncrossmatched packed red blood cells and $2\text{ units}$ of fresh frozen plasma, his blood pressure is $82/45\text{ mmHg}$.

A focused assessment with sonography for trauma (FAST) exam demonstrates a moderate amount of anechoic fluid in the hepatorenal recess (Morison pouch). An anteroposterior pelvic radiograph shows a $4\text{ cm}$ diastasis of the pubic symphysis and widening of the right sacroiliac joint.

Arterial blood gas analysis reveals a $\text{pH}$ of $7.22$, $\text{pCO}_2$ of $29\text{ mmHg}$, and $\text{HCO}_3^-$ of $12\text{ mEq/L}$.

The patient's estranged brother arrives and demands that all life-saving procedures be halted, stating the patient 'would never want to be kept alive like this.' There is no formal advance directive on file, and the patient's wife is currently unreachable.

Which of the following is the most appropriate next step in management?

A $54$-year-old woman presents to the emergency department complaining of excruciating abdominal pain and bilious emesis for the past $24$ hours. The pain was initially intermittent and crampy but has become constant and diffuse over the last $4$ hours. She underwent an open myomectomy $8$ years ago. Vital signs show a temperature of $39.1^\circ\text{C}$ ($102.4^\circ\text{F}$), a pulse of $128/\text{min}$, and a blood pressure of $86/50 \text{ mm Hg}$. Physical examination reveals a markedly distended abdomen with board-like rigidity, diffuse involuntary guarding, and pronounced rebound tenderness. Laboratory evaluation shows a leukocyte count of $22,000/\text{mm}^3$ and a serum lactate concentration of $4.8 \text{ mmol/L}$. Which of the following is the most appropriate next step in management?

A 24-year-old woman comes to an urgent care clinic reporting a painful skin rash, sore throat, and a low-grade fever that began 48 hours ago. Her medical history is notable for bipolar I disorder. She has been stable on valproate for three years. Five weeks ago, her psychiatrist initiated a cross-taper to a new mood stabilizer due to the patient's concerns regarding ongoing weight gain and hair thinning. She has been taking both medications exactly as prescribed. Her temperature is 38.8°C (101.8°F), pulse is 108/min, and blood pressure is 110/70 mm Hg. Physical examination reveals a diffuse, tender, erythematous, macular rash that easily coalesces into large blisters. Gentle pressure on the skin causes the top layer of the epidermis to detach. There are multiple painful erosions on her buccal mucosa and lips. Which of the following pharmacokinetic interactions most likely contributed to this patient's current condition?

A $74$-year-old man is assessed in the surgical intensive care unit for a new-onset fever. He is currently on postoperative day $10$ following an emergency open repair of a ruptured abdominal aortic aneurysm. His postoperative course has been complicated by hemorrhagic shock requiring massive transfusion and acute kidney injury that is slowly resolving. He was successfully extubated two days ago. Today, his temperature is $39.1^\circ\text{C}$ ($102.4^\circ\text{F}$), blood pressure is $105/65\text{ mmHg}$, and heart rate is $112/\text{min}$. He is delirious and cannot accurately localize pain. Physical examination reveals mild scleral icterus. The abdomen is distended with absent bowel sounds; there is voluntary guarding in the right upper quadrant when deep palpation is performed. The midline surgical incision is clean and intact. Laboratory studies show:

Leukocyte count: $21,500/\text{mm}^3$
Total bilirubin: $2.8\text{ mg/dL}$
Direct bilirubin: $2.1\text{ mg/dL}$
Alkaline phosphatase: $320\text{ U/L}$
Aspartate aminotransferase (AST): $55\text{ U/L}$
Alanine aminotransferase (ALT): $62\text{ U/L}$
Blood urea nitrogen: $45\text{ mg/dL}$
Serum creatinine: $2.4\text{ mg/dL}$

Which of the following is the most appropriate initial diagnostic test?

A 34-year-old woman is evaluated in the outpatient clinic at the insistence of her brother. According to him, she has been exhibiting highly unusual behavior for the past 8 weeks. She frequently pauses mid-conversation as if listening to an unseen individual and claims that a foreign intelligence agency is monitoring her thoughts via microchips in her dental fillings. Her brother notes that her speech has become disjointed, frequently jumping between completely unrelated topics. These changes started exactly two months ago; prior to this, she was employed as a graphic designer and functioning independently, but she has since been fired due to erratic behavior. She does not report any periods of depressed mood, elevated energy, or changes in sleep patterns. Vital signs and laboratory studies are within normal limits. Which of the following features most accurately differentiates this patient's current psychiatric syndrome from schizophrenia?

A family brings their 3-year-old daughter to the pediatric clinic due to concerns regarding her speech. The parents report that over the last 6 weeks, the child has begun repeating syllables at the beginning of sentences, frequently saying phrases like "Ca-ca-can we go outside?" or "I-I-I see the dog." These repetitions primarily occur when the child is highly excited or fatigued. The patient does not appear frustrated by these speech patterns, maintains steady eye contact, and exhibits no facial grimacing or physical tension while speaking. Her vocabulary is expanding appropriately, and she regularly engages in imaginative, cooperative play with her older sibling. A recent audiological screening was unremarkable. Which of the following is the most appropriate next step in management?

A 72-year-old man with a 20-year history of poorly controlled type 2 diabetes mellitus and a 50-pack-year smoking history presents with a non-healing ulcer on his left great toe. He also reports severe, burning pain in his left foot that awakens him from sleep; the pain improves when he hangs his foot over the edge of the bed. Physical examination reveals a $1.5 \text{ cm}$ shallow, dry ulcer with an eschar on the left hallux. The left foot is cool to the touch with diminished capillary refill. Femoral pulses are palpable bilaterally, but the left popliteal, dorsalis pedis, and posterior tibial pulses are absent.

Arrange the following diagnostic and therapeutic steps in the most appropriate sequential order for the management of this patient's condition.

A $68$-year-old man is evaluated in the surgical ward for a fever on postoperative day $5$ following an uncomplicated right total knee arthroplasty. His temperature is $38.4^\circ\text{C}$ ($101.1^\circ\text{F}$), pulse is $98/\text{min}$, respirations are $16/\text{min}$, and blood pressure is $135/85\text{ mmHg}$. The patient reports a new, deep aching pain in his right calf that is distinct from his surgical site pain. He has a medical history of hypertension and type $2$ diabetes mellitus. Current medications include prophylactic subcutaneous enoxaparin, lisinopril, and metformin. Physical examination reveals a clean and dry surgical incision with mild, expected postoperative swelling around the knee, but no erythema, fluctuance, or purulent drainage. There is moderate, asymmetric swelling and tenderness in the right posterior calf. Passive dorsiflexion of the right foot elicits pain in the calf. Lungs are clear to auscultation bilaterally. A Foley catheter was removed on postoperative day $1$, and he has been voiding without dysuria. Which of the following is the most appropriate next step in management?

A $72$-year-old woman is evaluated in the surgical intensive care unit for new-onset fever and hypotension. She is currently on postoperative day $6$ following an exploratory laparotomy and small bowel resection for mesenteric ischemia. Her past medical history includes ischemic cardiomyopathy with a left ventricular ejection fraction of $35\%$, and type $2$ diabetes mellitus. She has been receiving parenteral nutrition via a right internal jugular central venous catheter that was placed prior to her surgery.

Over the past $6$ hours, her temperature has risen to $39.4^\circ\text{C}$ ($102.9^\circ\text{F}$), heart rate to $122\text{/min}$, and blood pressure decreased to $85/50\text{ mm Hg}$. Her urine output has dropped to $10\text{ mL/h}$ over the last $4$ hours.

Physical examination reveals a lethargic patient. Jugular venous pressure is estimated at $3\text{ cm H}_2\text{O}$. The lungs are clear to auscultation bilaterally. The abdomen is mildly distended but non-tender, with a clean, intact midline surgical incision. Inspection of the right internal jugular catheter site reveals $2\text{ cm}$ of surrounding erythema and purulent exudate at the insertion site.

Laboratory studies:
Leukocyte count: $21,000\text{/mm}^3$ ($85\%$ neutrophils, $10\%$ bands)
Serum creatinine: $2.1\text{ mg/dL}$ (baseline $1.1\text{ mg/dL}$)
Blood lactic acid: $4.2\text{ mmol/L}$

Blood and urine cultures have been obtained. Which of the following are appropriate next steps in the management of this patient? (Select all that apply)

A $65$-year-old woman is evaluated in the surgical intensive care unit on postoperative day $7$ following a pancreaticoduodenectomy. She has been receiving total parenteral nutrition via a right internal jugular central venous catheter that was placed prior to surgery. Over the past $2$ hours, she has developed chills and altered mental status. Her temperature is $39.4^\circ\text{C}$ ($102.9^\circ\text{F}$), blood pressure is $90/55\text{ mm Hg}$, pulse is $122/\text{min}$, and respirations are $24/\text{min}$. Physical examination of the central line insertion site reveals erythema, induration, and a small amount of purulent exudate.

Arrange the following management steps in the correct chronological order according to standard sepsis and central line-associated bloodstream infection (CLABSI) protocols.

A 5-year-old boy is brought to the emergency department after falling from a trampoline onto his outstretched right hand. He is crying and refuses to move his right arm. Physical examination reveals a gross, "S-shaped" deformity of the right elbow with significant soft tissue swelling. The right hand is pale and cool, and the radial pulse is absent on palpation. Radiographs show a completely displaced, extension-type supracondylar fracture of the humerus. The patient is immediately taken to the operating room, where closed reduction and percutaneous pinning are performed. Following stabilization of the fracture, the right hand remains pale and cool, and the radial pulse cannot be detected by Doppler ultrasound. Which of the following is the most appropriate next step in the management of this patient?

A 34-year-old woman is evaluated in the trauma bay after being struck by a fast-moving electric bicycle while crossing the street. She was thrown several feet and struck her abdomen against the edge of a sidewalk. On arrival, she is lethargic but responds to voice. Her temperature is $36.8^\circ C$ ($98.2^\circ F$), blood pressure is $82/50$ mm Hg, pulse is $128$/min, and respirations are $22$/min. Primary survey reveals a patent airway and clear, equal breath sounds bilaterally. The abdomen is visibly distended, firm, and diffusely tender to palpation with guarding. A focused assessment with sonography for trauma (FAST) shows a large amount of anechoic fluid in the hepatorenal recess (Morison's pouch) and the splenorenal recess. Two large-bore intravenous lines are placed, and fluid resuscitation is initiated. Which of the following is the most appropriate next step in management?

A $28$-year-old woman, who is at $10$ weeks gestation in her first pregnancy, presents to the psychiatric clinic with a $4$-week history of overwhelming sadness, excessive sleeping up to $14\text{ hours}$ a day, and a sensation that her arms and legs are "weighed down by lead." She experiences daily crying spells and profound guilt over her lack of excitement regarding the pregnancy. She mentions that her primary care physician prescribed fluoxetine $3$ weeks ago, but she discontinued it yesterday because she felt it was completely ineffective. Vital signs are within normal limits. Laboratory studies show a thyroid-stimulating hormone (TSH) level of $0.2\text{ \mu U/mL}$ (normal non-pregnant: $0.5$-$5.0\text{ \mu U/mL}$) and a free thyroxine (T4) level of $1.1\text{ ng/dL}$ (normal: $0.9$-$1.7\text{ ng/dL}$). Which of the following is the most appropriate next step in the management of this patient?

During morning rounds on the surgical ward, the team evaluates a female patient who underwent an uncomplicated left hemicolectomy three days ago for early-stage colon cancer. She is 68 years old and reports feeling progressively more short of breath since the previous evening. She also notes a new cough that produces thick, yellowish sputum, along with feeling hot and sweaty. Her past medical history includes hypertension and severe chronic obstructive pulmonary disease (COPD) managed with daily inhaled corticosteroids and long-acting bronchodilators.

Vital signs are:
Temperature: 38.8°C (101.8°F)
Blood pressure: 130/85 mm Hg
Pulse: 110/min
Respirations: 24/min
Oxygen saturation: 91% on room air

On physical examination, the patient appears in mild respiratory distress. Lung auscultation demonstrates crackles at the right lung base, a prolonged expiratory phase, and diffuse bilateral wheezing. The surgical incision is healing well without erythema or induration. The abdomen is soft and non-distended, with normoactive bowel sounds. There is no lower extremity edema or calf tenderness.

Laboratory results show a leukocyte count of 14,500/mm³. A chest radiograph demonstrates a new, patchy alveolar consolidation in the right lower lobe.

Which of the following interventions should be included in the immediate management of this patient? (Select all that apply)

A psychiatric consultation is requested for a 31-year-old male inpatient admitted to the medical intensive care unit. The patient was transferred from an outpatient psychiatric facility after developing severe muscle stiffness, diaphoresis, and altered mental status. He has a history of schizoaffective disorder and was recently prescribed fluphenazine. Current vital signs include a pulse of 115/min, blood pressure of 165/95 mmHg, and a temperature of 39.1°C (102.4°F). Physical examination reveals mutism and profound 'lead-pipe' rigidity. Laboratory evaluation reveals a significantly elevated serum creatine kinase level. The diagnosis of neuroleptic malignant syndrome (NMS) is established.

Arrange the following clinical interventions in the correct chronological sequence for managing this patient's condition, from the most immediate initial step to the final long-term management step.

Match each patient's clinical presentation to the psychological therapy that represents the most appropriate, evidence-based first-line treatment for their specific condition.

A 24-year-old man is brought to the emergency department by police after being found wandering in traffic. He is combative, completely disoriented, and screaming that he can fly. Physical examination reveals multidirectional nystagmus, tachycardia, and prominent diaphoresis. As the triage nurse approaches, the patient abruptly attempts to strike her. Arrange the following interventions in the most appropriate sequential order for the acute management of this patient's substance-induced agitation.

Investigators at a multi-center orthopedic institute are evaluating the relationship between preoperative hemoglobin A1c (HbA1c) levels and the incidence of prosthetic joint infections. To conduct the analysis, they access a comprehensive surgical database containing records of all patients who underwent elective total knee arthroplasty between 2018 and 2023. The researchers categorize the identified patients into two groups: those who had a preoperative HbA1c $\geq$ 8.0% and those who had an HbA1c < 8.0%. They then examine the follow-up clinical notes and microbiology reports within the database to calculate and compare the frequency of prosthetic joint infections that occurred within one year of surgery for both groups. Which of the following best describes the study design used in this investigation?