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Medicine Ultimate Exam
Question 1. Which of the following best describes the primary hemodynamic change in distributive (septic) shock? A) Decreased systemic vascular resistance with normal or increased cardiac output B) Increased systemic vascular resistance with low cardiac output C) Decreased preload with preserved afterload D) Elevated pulmonary capillary wedge pressure Answer: A Explanation: Septic shock is characterized by profound vasodilation, leading to a fall in systemic vascular resistance while the heart often maintains or increases output. Question 2. In the Berlin definition of ARDS, which PaO₂/FiO₂ ratio on PEEP ≥ 5 cm H₂O defines severe ARDS? A) ≤ 200 mmHg B) ≤ 150 mmHg C) ≤ 100 mmHg D) ≤ 300 mmHg Answer: C Explanation: Severe ARDS is defined by a PaO₂/FiO₂ ≤ 100 mmHg with a minimum PEEP of 5 cm H₂O. Question 3. Which vasopressor is recommended as first-line therapy for septic shock after adequate fluid resuscitation? A) Dopamine B) Norepinephrine C) Phenylephrine
Medicine Ultimate Exam
D) Epinephrine Answer: B Explanation: Current guidelines favor norepinephrine as the initial vasopressor for septic shock due to its potent α-adrenergic effects and better safety profile. Question 4. The most reliable bedside method to assess fluid responsiveness in a mechanically ventilated patient is: A) Central venous pressure measurement B) Passive leg raise test with stroke volume monitoring C) Urine output monitoring D) Pulmonary artery occlusion pressure Answer: B Explanation: A passive leg raise transiently increases preload; observing a ≥10 % rise in stroke volume (via echocardiography or pulse contour analysis) predicts fluid responsiveness. Question 5. Which of the following ventilator modes delivers a set inspiratory pressure and allows the patient to trigger breaths? A) Volume-controlled ventilation (VCV) B) Pressure-controlled ventilation (PCV) C) Pressure-support ventilation (PSV) D) Synchronized intermittent mandatory ventilation (SIMV) Answer: C Explanation: PSV is a spontaneous mode where each breath is patient-triggered and delivered with a preset pressure level. Question 6. In a patient with acute severe asthma requiring mechanical ventilation, the most appropriate initial ventilator setting is:
Medicine Ultimate Exam
Question 9. In the context of acute kidney injury, the KDIGO stage 2 is defined by which of the following serum creatinine changes? A) Increase ≥ 0.3 mg/dL within 48 h B) Increase 2- to 2.9-fold from baseline C) Increase ≥ 4.0 mg/dL or initiation of renal replacement therapy D) Decrease urine output < 0.5 ml/kg/h for > 12 h Answer: B Explanation: KDIGO stage 2 AKI corresponds to a 2- to 2.9-fold rise in serum creatinine from baseline. Question 10. Which of the following is the preferred anticoagulant for continuous renal replacement therapy (CRRT) in a patient with heparin-induced thrombocytopenia (HIT)? A) Unfractionated heparin B) Low-molecular-weight heparin C) Argatroban D) Warfarin Answer: C Explanation: Argatroban, a direct thrombin inhibitor, is safe in HIT and can be used for circuit anticoagulation. Question 11. A patient with traumatic brain injury has an intracranial pressure (ICP) of 28 mmHg and a mean arterial pressure (MAP) of 80 mmHg. What is the cerebral perfusion pressure (CPP) and the immediate therapeutic target? A) CPP = 52 mmHg; target > 70 mmHg B) CPP = 52 mmHg; target > 60 mmHg C) CPP = 108 mmHg; target > 70 mmHg
Medicine Ultimate Exam
D) CPP = 108 mmHg; target > 60 mmHg Answer: B Explanation: CPP = MAP − ICP = 80 − 28 = 52 mmHg. Guidelines recommend maintaining CPP > 60 mmHg in TBI. Question 12. Which sedative agent is most associated with propofol infusion syndrome when used at high doses for prolonged periods? A) Midazolam B) Dexmedetomidine C) Ketamine D) Propofol Answer: D Explanation: Propofol infusion syndrome manifests with metabolic acidosis, rhabdomyolysis, and cardiac failure, especially with > 4 mg/kg/h infusions > 48 h. Question 13. In a patient with septic shock, which of the following adjunctive therapies has the strongest evidence for mortality benefit? A) High-dose vitamin C B) Low-dose hydrocortisone C) Activated protein C D) Thiamine supplementation Answer: B Explanation: Low-dose hydrocortisone (200 mg/day) can reduce vasopressor requirement and may improve outcomes in refractory septic shock. Question 14. Which of the following statements about the use of levosimendan in cardiogenic shock is correct?
Medicine Ultimate Exam
Explanation: Capnography provides real-time verification of tracheal placement and is superior to auscultation, especially in low-flow states. Question 17. In a patient with severe hypercapnic respiratory failure, which ventilatory strategy is most effective in reducing PaCO₂ while minimizing barotrauma? A) High tidal volume (10 ml/kg) with low respiratory rate B) Low tidal volume (6 ml/kg) with high respiratory rate C) Pressure-controlled ventilation with high inspiratory pressure D) Airway pressure release ventilation (APRV) with prolonged release time Answer: B Explanation: Increasing respiratory rate while keeping tidal volume low enhances minute ventilation without excessive airway pressures. Question 18. Which of the following is the hallmark laboratory finding of tumor lysis syndrome? A) Hyperuricemia, hyperphosphatemia, hyperkalemia, hypocalcemia B) Hypouricemia, hypophosphatemia, hyperkalemia, hypercalcemia C) Hyperuricemia, hypophosphatemia, hyponatremia, metabolic alkalosis D) Hyperuricemia, hyperphosphatemia, hyponatremia, metabolic acidosis Answer: A Explanation: Rapid cell lysis releases intracellular potassium, phosphate, and nucleic acids (converted to uric acid), leading to the described electrolyte pattern. Question 19. The most appropriate initial fluid for resuscitation of a patient with severe sepsis and lactate > 4 mmol/L is: A) 0.9 % NaCl B) Lactated Ringer’s solution
Medicine Ultimate Exam
C) 5 % dextrose in water (D5W) D) Albumin 5 % Answer: B Explanation: Balanced crystalloids (e.g., Lactated Ringer’s) are preferred over normal saline to reduce hyperchloremic metabolic acidosis. Question 20. Which of the following is a contraindication to the use of prone positioning in severe ARDS? A) PaO₂/FiO₂ < 80 mmHg B) BMI > 35 kg/m² C) Unstable spinal fracture D) Presence of a central venous catheter Answer: C Explanation: Unstable spinal injuries pose a risk of further neurologic injury during prone positioning. Question 21. In the management of massive hemoptysis (> 200 ml/24 h), the first-line bronchoscopic intervention is: A) Laser coagulation B) Endobronchial balloon tamponade C) Electrocautery D) Cryotherapy Answer: B Explanation: Endobronchial balloon tamponade provides rapid airway control and limits blood loss. Question 22. Which of the following best characterizes the “tight glucose control” target recommended by the latest Surviving Sepsis Campaign?
Medicine Ultimate Exam
Question 25. In a patient with acute decompensated heart failure requiring vasopressor support, which agent provides both inotropic and vasodilatory effects? A) Norepinephrine B) Dopamine C) Milrinone D) Phenylephrine Answer: C Explanation: Milrinone is a phosphodiesterase-3 inhibitor that increases contractility and reduces systemic vascular resistance. Question 26. The most appropriate initial test to confirm a diagnosis of Guillain-Barré syndrome in the ICU is: A) Serum anti-GM1 antibodies B) Nerve conduction studies C) Lumbar puncture showing albumin-cytologic dissociation D) MRI of the spine Answer: C Explanation: Cerebrospinal fluid analysis demonstrating elevated protein with normal cell count is classic and can be obtained rapidly. Question 27. Which of the following ventilation strategies is recommended to minimize ventilator-induced lung injury (VILI) in patients with moderate ARDS? A) Tidal volume 10 ml/kg, PEEP 5 cm H₂O B) Tidal volume 6 ml/kg, driving pressure < 15 cm H₂O C) High-frequency oscillatory ventilation (HFOV) as first line
Medicine Ultimate Exam
D) Mandatory rate > 30 breaths/min Answer: B Explanation: Low tidal volume with a driving pressure (plateau-PEEP) < 15 cm H₂O reduces overdistension and cyclic atelectasis. Question 28. A 65-year-old man with septic shock has a serum lactate that falls from 5.0 mmol/L to 2.2 mmol/L after 6 h of therapy. This trend most strongly predicts: A) Development of acute kidney injury B) Increased risk of nosocomial infection C) Better 28-day survival D. Need for mechanical ventilation Answer: C Explanation: Early lactate clearance is associated with reduced mortality in sepsis. Question 29. In a patient receiving continuous infusion of norepinephrine, the addition of which drug is most likely to reduce the required norepinephrine dose while improving cardiac output? A. Phenylephrine B. Vasopressin C. Dobutamine D. Epinephrine Answer: C Explanation: Dobutamine, a β1-agonist, augments cardiac output, allowing a reduction in norepinephrine dose to maintain MAP. Question 30. Which of the following is the most common cause of hyperchloremic metabolic acidosis in ICU patients?
Medicine Ultimate Exam
Question 33. Which laboratory finding is most specific for diagnosing disseminated intravascular coagulation (DIC)? A. Elevated D-dimer and prolonged PT/INR B. Thrombocytopenia with normal fibrinogen C. Isolated prolonged aPTT D. Mild leukocytosis Answer: A Explanation: DIC is characterized by consumption of clotting factors (prolonged PT/INR) and fibrinolysis (elevated D-dimer). Question 34. In a patient with acute severe hyponatremia (serum Na < 120 mmol/L) presenting with seizures, the initial therapy of choice is: A. Free water restriction alone B. Hypertonic 3 % saline bolus 100 ml over 10 min C. Isotonic 0.9 % saline infusion 1 L over 2 h D. Oral sodium tablets Answer: B Explanation: Rapid correction with hypertonic saline is required to control seizures while avoiding over-correction. Question 35. Which of the following statements about heparin-induced thrombocytopenia (HIT) type II is correct? A. It is mediated by anti-PF4/heparin IgG antibodies that activate platelets. B. Platelet count usually drops below 20 × 10⁹/L. C. HIT occurs only with low-molecular-weight heparin. D. Warfarin is the first-line treatment.
Medicine Ultimate Exam
Answer: A Explanation: HIT type II is an immune-mediated reaction where IgG antibodies form complexes with PF4/heparin, leading to platelet activation and thrombosis. Question 36. A patient with acute pancreatitis has a BISAP score of 3. What is the approximate risk of mortality associated with this score? A. < 1 % B. 3 % C. 10 % D. 20 % Answer: C Explanation: A BISAP score of 3 correlates with roughly a 10 % in-hospital mortality. Question 37. Which of the following is the most appropriate initial therapy for a patient with confirmed invasive candidemia? A. Fluconazole 400 mg IV daily B. Caspofungin loading dose 70 mg IV then 50 mg daily C. Amphotericin B deoxycholate 1 mg/kg daily D. Micafungin 100 mg IV daily Answer: B Explanation: Echinocandins (caspofungin) are first-line for candidemia due to high efficacy and favorable safety profile. Question 38. In a patient with severe traumatic brain injury, which hyperosmolar agent is preferred for rapid reduction of ICP? A. Mannitol 0.5 g/kg bolus
Medicine Ultimate Exam
Question 41. The most appropriate method to confirm placement of a central venous catheter (CVC) in the internal jugular vein at bedside is: A. Chest X-ray after insertion B. Ultrasound visualization of guidewire and catheter tip C. Measurement of central venous pressure waveform D. Auscultation of a “thrill” over the insertion site Answer: B Explanation: Real-time ultrasound ensures venous entry and can be used to track catheter tip location, reducing malposition risk. Question 42. In a patient with refractory hypoxemia despite optimal ventilator settings, which adjunctive therapy has the strongest evidence for mortality benefit? A. Inhaled nitric oxide B. Prone positioning for > 12 h/day C. High-dose corticosteroids D. Bronchodilator nebulization Answer: B Explanation: Prone positioning improves dorsal lung recruitment and has demonstrated mortality reduction in severe ARDS. Question 43. Which of the following is the most common cause of acute decompensation in a patient with known chronic heart failure on beta-blocker therapy? A. Abrupt discontinuation of the beta-blocker B. Initiation of a high-dose ACE inhibitor C. Development of atrial fibrillation with rapid ventricular response
Medicine Ultimate Exam
D. Administration of intravenous fluids > 2 L Answer: C Explanation: New-onset rapid atrial fibrillation can precipitate acute heart failure decompensation. Question 44. The primary mechanism by which vasopressin restores vascular tone in septic shock is: A. Direct β1-adrenergic stimulation B. Activation of V1 receptors causing vasoconstriction C. Inhibition of nitric oxide synthase D. Increase in intracellular cAMP Answer: B Explanation: Vasopressin acts on V1 receptors on vascular smooth muscle, leading to potent vasoconstriction independent of catecholamines. Question 45. Which of the following laboratory values best indicates a high-risk patient for developing acute kidney injury after major abdominal surgery? A. Pre-operative serum creatinine 1.0 mg/dL B. Pre-operative eGFR 90 ml/min/1.73 m² C. Pre-operative serum cystatin C 1.5 mg/L D. Pre-operative urine output 0.7 ml/kg/h Answer: C Explanation: Elevated cystatin C reflects reduced glomerular filtration and predicts postoperative AKI better than creatinine alone. Question 46. In a patient with severe sepsis and a known allergy to penicillins, the preferred empiric anti-pseudomonal β-lactam is:
Medicine Ultimate Exam
Question 49. Which of the following anticoagulation strategies is recommended during continuous venovenous hemofiltration (CVVH) to prevent circuit clotting while minimizing bleeding risk? A. Unfractionated heparin infusion targeting aPTT 1.5- 2 × control B. Regional citrate anticoagulation with calcium infusion C. Low-dose argatroban infusion D. No anticoagulation, rely on high-flow rates Answer: B Explanation: Citrate chelates calcium locally in the circuit, providing effective anticoagulation with a lower systemic bleeding risk. Question 50. In a patient with severe hypertriglyceridemia-induced pancreatitis, which therapeutic measure is most effective at rapidly lowering triglyceride levels? A. High-dose insulin infusion B. Therapeutic plasma exchange C. Low-fat diet D. Intravenous heparin Answer: B Explanation: Plasma exchange removes triglyceride-rich plasma and replaces it with fresh frozen plasma, achieving rapid decline. Question 51. Which of the following is the most appropriate target for mean arterial pressure (MAP) in a patient with chronic hypertension undergoing septic shock resuscitation? A. 55 mmHg B. 65 mmHg
Medicine Ultimate Exam
C. 80- 85 mmHg D. 90 mmHg Answer: C Explanation: Patients with chronic hypertension may require a higher MAP (≈ 80- 85 mmHg) to ensure adequate organ perfusion. Question 52. The primary advantage of using a low-tidal-volume ventilation strategy in patients without ARDS is: A. Prevention of atelectasis B. Reduction of ventilator-associated pneumonia C. Decrease in diaphragmatic fatigue D. Minimization of volutrauma and biotrauma Answer: D Explanation: Even in non-ARDS patients, low tidal volumes limit overdistension and inflammatory mediator release. Question 53. Which of the following is the most common pathogen causing ventilator-associated pneumonia (VAP) in the ICU? A. Streptococcus pneumoniae B. Pseudomonas aeruginosa C. Staphylococcus aureus (MSSA) D. Haemophilus influenzae Answer: B Explanation: Pseudomonas aeruginosa is a leading gram-negative organism associated with VAP, especially after prolonged ventilation. Question 54. In a patient with acute severe hyponatremia secondary to SIADH, the drug of choice to promote free water excretion is:
