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anticoagulation

Practice targeted AMC-style multiple-choice questions on anticoagulation.

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 72-year-old female presents with right leg pain and skin changes after starting warfarin for atrial fibrillation. Her INR is 3.5. Examination reveals the findings in the image. What is the MOST appropriate next step in management?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 78-year-old female on warfarin for chronic atrial fibrillation presents to the emergency department with a 24-hour history of increasing pain and discolouration in her right lower leg. She reports the pain is severe and worsening rapidly. She denies trauma or recent falls. Her INR this morning was 2.5 (target 2.0-3.0). Vital signs are stable: BP 130/80, HR 75, RR 16, Temp 36.8°C. Examination reveals the findings shown in the image. Considering the patient's history, current medication, and the clinical appearance depicted, what is the most appropriate immediate therapeutic intervention?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 78-year-old male on warfarin for atrial fibrillation presents with acute dyspnea and pleuritic chest pain. His INR is 7.0. A chest CT is performed (image attached). After initial resuscitation, what is the MOST appropriate intervention?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 78-year-old male on warfarin presents with dyspnea and pleuritic chest pain after a fall. INR is 7.0. A chest CT is performed (image attached). After initial resuscitation, what is the MOST appropriate next step?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 78-year-old male on warfarin for atrial fibrillation presents with sudden onset of severe dyspnoea and right-sided pleuritic chest pain. He denies trauma. On examination, he is tachypnoeic, oxygen saturation is 92% on room air. Blood pressure 110/70 mmHg, heart rate 95 bpm. Chest examination reveals decreased breath sounds on the right. A CT scan of the chest is performed. Considering the patient's clinical presentation, medical history, and the findings demonstrated in the provided image, which of the following pharmacological agents is the most appropriate immediate intervention?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 68-year-old female presents with right leg pain and skin changes after starting warfarin for atrial fibrillation 5 days ago. Her INR is currently 3.5. Examination reveals the findings in the image. What is the MOST appropriate next step in management?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 78-year-old male on warfarin presents to the ED after a fall. He complains of dyspnea and right-sided chest pain. His INR is 5.0. Vitals: HR 110, BP 100/60, RR 28, SpO2 90% on room air. The provided image was obtained. What is the MOST appropriate next step?

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A 78-year-old man with a history of chronic atrial fibrillation and hypertension presents to the emergency department with sudden onset of severe pain, numbness, and coldness in his left leg, starting approximately 3 hours ago. He is currently taking aspirin 100mg daily. On examination, his left foot and lower calf are pale and cool to touch. Pedal pulses are absent, popliteal pulse is weak. Sensation is decreased below the ankle, and motor function is preserved but weak. Capillary refill in the toes is delayed. His heart rate is irregularly irregular at 95 bpm, blood pressure 140/85 mmHg. What is the most appropriate initial management step?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 72-year-old male presents to the ED with sudden onset shortness of breath and right-sided chest pain. He has a history of atrial fibrillation and has been taking warfarin for the past 5 years. His INR is currently 6.0. A CT scan of the chest is performed (image attached). What is the MOST appropriate initial management step?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 68-year-old male on warfarin presents post-fall with dyspnea and pleuritic chest pain. INR is 4.8. Vitals: HR 115, BP 95/60, RR 26, SpO2 89% on air. The provided image was obtained. What is the MOST appropriate next step?

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A 68-year-old man with atrial fibrillation is scheduled for elective hip replacement surgery. He is currently on warfarin with a target INR of 2.0-3.0. His INR is 2.5 at the preoperative assessment. What is the most appropriate management of his anticoagulation therapy in preparation for surgery?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 65-year-old patient recently started on warfarin for deep vein thrombosis presents with a painful, expanding skin lesion on their leg. They report the lesion appeared suddenly and has worsened over the past 24 hours. INR is 2.8. Considering the clinical presentation and the appearance of the lesion, what is the most appropriate immediate management step?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 68-year-old male on warfarin presents with pleuritic chest pain and mild dyspnea. INR is 4.5. The image was obtained. What is the MOST appropriate initial intervention?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 72-year-old male presents to the ED with sudden onset shortness of breath and right-sided chest pain. He reports a recent fall but denies any significant trauma. He has a history of atrial fibrillation and is currently taking warfarin. His INR is 6.5. A CT scan of the chest is performed (image attached). What is the MOST appropriate immediate next step in management?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A patient on warfarin presents with leg pain. INR is 3.5. Given the image, what is the MOST appropriate next step?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

An 82-year-old woman with a history of paroxysmal atrial fibrillation and a recent hospitalisation for pneumonia was discharged 5 days ago on warfarin 5mg daily. She presents to the emergency department complaining of increasing pain and a rapidly evolving lesion on her right lower leg over the past 48 hours. She denies trauma. Her vital signs are stable: BP 130/80 mmHg, HR 78 bpm, RR 16/min, Temp 36.8°C. Physical examination reveals the appearance shown in the image on her right anterior lower leg. Her INR today is 4.5. She has no known history of protein C or S deficiency. Considering the patient's history, current medication, laboratory result, and the clinical appearance depicted, which of the following represents the most appropriate immediate management strategy?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 78-year-old female on warfarin for chronic atrial fibrillation presents to the emergency department with a 24-hour history of increasing pain and discolouration in her right lower leg. She denies trauma or recent falls. Her INR this morning was 2.5 (target 2.0-3.0). Vital signs are stable: BP 130/80, HR 75, RR 16, Temp 36.8°C. Examination reveals the findings shown in the image. Considering the patient's history, current medication, and the clinical appearance depicted, what is the most appropriate immediate management?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 68-year-old woman recently started on warfarin for a pulmonary embolism presents with a painful, rapidly expanding purpuric lesion on her thigh, which developed two days ago. Her INR is 2.5. She has no history of trauma to the area. Considering the clinical presentation and the appearance of the lesion, what is the most likely underlying pathophysiological process?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A patient on warfarin presents with leg pain. INR is 3.5. Given the image, what is the MOST likely underlying cause?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 72-year-old woman presents with increasing pain in her right leg. She has been on warfarin for atrial fibrillation for the past 5 days. Her INR is currently 3.5. Examination reveals the findings shown. What is the MOST appropriate next step in management?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 78-year-old male on warfarin for atrial fibrillation presents to the emergency department with sudden onset of severe dyspnoea and right-sided pleuritic chest pain. He denies trauma. On examination, he is tachypnoeic, oxygen saturation is 92% on room air. Blood pressure 110/70 mmHg, heart rate 95 bpm. Chest examination reveals decreased breath sounds on the right. A CT scan of the chest is performed. Considering the patient's clinical presentation, medical history, and the findings demonstrated in the provided image, which of the following interventions is most critical to initiate *before* considering invasive drainage?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 72-year-old male on warfarin presents with sudden onset shortness of breath and right-sided chest pain after a fall. His INR is 4.5. The provided image was obtained. What is the MOST appropriate next step in management?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A patient on warfarin presents with leg pain. INR is 3.5. Given the image, what is the MOST appropriate initial pharmacological intervention?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 68-year-old male presents to the emergency department complaining of acute onset shortness of breath and right-sided chest pain. He reports that the pain started suddenly this morning and has been gradually worsening. He has a history of paroxysmal atrial fibrillation, for which he takes warfarin. He denies any recent trauma or injury. On examination, his vital signs are: heart rate 115 bpm, blood pressure 95/60 mmHg, respiratory rate 30 breaths per minute, oxygen saturation 87% on room air. Auscultation reveals decreased breath sounds on the right side. The patient appears pale and is diaphoretic. His INR is 6.5. A CT scan of the chest is performed, and the relevant image is shown. What is the MOST appropriate next step in the management of this patient?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 72-year-old male presents to the ED with sudden onset shortness of breath and right-sided chest pain. He has a history of atrial fibrillation and has been taking warfarin for the past 5 years. His INR is currently 6.5. A CT scan of the chest is performed (image attached). What is the MOST appropriate immediate next step in the management of this patient?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 68-year-old patient on warfarin for a recent DVT presents with a painful, rapidly expanding skin lesion on their leg that started 48 hours ago. Their INR is 2.9. Given the clinical context and the appearance of the lesion, what is the most appropriate immediate management step?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 68-year-old woman on warfarin for chronic atrial fibrillation presents with increasing pain in her right leg over the past 48 hours. Her INR is 4.0. Examination reveals the findings in the image. What is the MOST likely underlying cause?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 68-year-old female presents with right leg pain and skin changes after starting warfarin for atrial fibrillation 5 days ago. Her INR is currently 3.5. Examination reveals the findings in the image. What is the MOST appropriate next step in management?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

An 82-year-old woman with a history of paroxysmal atrial fibrillation and a recent hospitalisation for pneumonia was discharged 5 days ago on warfarin 5mg daily. She presents to the emergency department complaining of increasing pain and a rapidly evolving lesion on her right lower leg over the past 48 hours. She denies trauma. Her vital signs are stable: BP 130/80 mmHg, HR 78 bpm, RR 16/min, Temp 36.8°C. Physical examination reveals the appearance shown in the image on her right anterior lower leg. Her INR today is 4.5. She has no known history of protein C or S deficiency. Considering the patient's history, current medication, laboratory result, and the clinical appearance depicted, which of the following represents the most appropriate immediate management strategy?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 75-year-old male on warfarin for atrial fibrillation presents with acute dyspnoea and pleuritic chest pain. He is hypotensive with a BP of 90/60 mmHg and tachycardic at 110 bpm. His INR is 7.2. A chest CT is performed (image attached). Considering the clinical context and imaging findings, what is the MOST appropriate immediate management step?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 78-year-old male on warfarin presents with acute shortness of breath. INR is 5.0. The provided image was obtained. What is the MOST likely underlying cause?

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CT scan showing hemothorax caused by warfarin use
Image by Cevik Y CC BY 3.0 · Source

A 72-year-old male on warfarin presents with sudden onset dyspnea. His INR is 6.0. The provided image was obtained. What is the MOST appropriate next step?

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A 62-year-old woman presents to the emergency department with acute confusion and weakness on the right side of her body. She has a history of atrial fibrillation and is on warfarin for anticoagulation. Her INR is 3.5. On examination, she is disoriented to time and place, with a right-sided facial droop and hemiparesis. A CT scan of the head shows a left-sided intracerebral hemorrhage. What is the most appropriate next step in the management of this patient?

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Right leg affected by warfarin necrosis
Image by Bakoyiannis C, Karaolanis G, Patelis N, Maskanakis A, Tsaples G, Klonaris C, Georgopoulos S, Liakakos T CC BY 4.0 · Source

A 75-year-old woman on warfarin for chronic atrial fibrillation presents to the emergency department with a 24-hour history of rapidly worsening pain and discolouration in her right lower leg. She denies trauma. Her INR is 2.8. Physical examination reveals the findings shown in the image. Peripheral pulses are palpable. What is the most appropriate immediate management step?

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