Hypersensitivity pneumonitis — MCQs

A 7-year-old boy is rushed to the urgent care department from a friend’s birthday party with breathing trouble. He is immediately placed on supplemental oxygen therapy. The patient’s father explains that peanut butter treats were served at the event, but he reported not having witnessed his son actually eat one. During the party, the patient approached his father with facial flushing, difficulty breathing, and itching of his face and neck. The patient was born at 40 weeks gestation via spontaneous vaginal delivery. He has met all age-related developmental milestones and is fully vaccinated. His past medical history is significant for peanut allergy and asthma. He carries an emergency inhaler. Family history is noncontributory. The patient’s vitals signs include a blood pressure of 110/85 mm Hg, a heart rate of 110/min, a respiratory rate of 25/min, and a temperature of 37.2°C (99.0°F). Physical examination reveals severe facial edema and severe audible stridor in both lungs. Which of the following types of hypersensitivity reaction is the most likely in this patient?

A 23-year-old man presents to the emergency department with shortness of breath. The patient was at a lunch hosted by his employer. He started to feel his symptoms begin when he started playing football outside with a few of the other employees. The patient has a past medical history of atopic dermatitis and asthma. His temperature is 98.3°F (36.8°C), blood pressure is 87/58 mmHg, pulse is 150/min, respirations are 22/min, and oxygen saturation is 85% on room air. Which of the following is the best next step in management?

A 55-year-old man with a history of fatigue and exertional dyspnea presents to the urgent care clinic following an acute upper respiratory illness. On physical examination, his pulses are bounding, his complexion is very pale, and scleral icterus is apparent. The spleen is moderately enlarged. Oxygen saturation is 79% at rest, with a new oxygen requirement of 9 L by a non-rebreather mask. Laboratory analysis results show a hemoglobin level of 6.8 g/dL. Of the following options, which hypersensitivity reaction does this condition represent?

A 51-year-old man presents to the clinic with a history of hematuria and hemoptysis following pneumonia several weeks ago. He works as a hotel bellhop. His medical history is significant for gout, hypertension, hypercholesterolemia, diabetes mellitus type II, and mild intellectual disability. He currently smokes 2 packs of cigarettes per day and denies any alcohol use or any illicit drug use. His vital signs include: temperature 36.7°C (98.0°F), blood pressure 126/74 mm Hg, heart rate 87/min, and respiratory rate 23/min. Physical examination shows minimal bibasilar rales, but otherwise clear lungs on auscultation, grade 2/6 holosystolic murmur, and benign abdominal findings. Pulmonary function tests demonstrate a restrictive pattern and a current chest radiograph shows bibasilar alveolar infiltrates. Clinical pathology analysis reveals antiglomerular basement membrane antibody, and his renal biopsy shows a linear immunofluorescence pattern. Of the following options, which type of hypersensitivity reaction underlies this patient’s diagnosis?

A 34-year-old woman comes to the physician because of a 6-week history of fever and productive cough with blood-tinged sputum. She has also had a 4-kg (8.8-lb) weight loss during the same time period. Examination shows enlarged cervical lymph nodes. An x-ray of the chest shows a 2.5-cm pulmonary nodule in the right upper lobe. A biopsy specimen of the lung nodule shows caseating granulomas with surrounding multinucleated giant cells. Which of the following is the most likely underlying cause of this patient's pulmonary nodule?

A 48-year-old woman with alpha-1-antitrypsin deficiency undergoes a lung transplant. She tolerates the surgery well, but 3 years later develops inflammation and fibrosis in her terminal bronchioles. Which of the following best describes the pathophysiology of this patient's deterioration?

A 28-year-old man comes to his general practitioner for a regular checkup. He has had trouble breathing lately with coughing, shortness of breath, and wheezing. Problems first started when he went running (outside), but he is also observing the problems when taking a light walk or resting. As a child, he suffered from atopic dermatitis, just like his father and sister. He also has a history of hay fever. What is the most likely cause of his symptoms?

A 3-year-old boy is brought to the emergency department by his mother because of a cough and mild shortness of breath for the past 12 hours. He has not had fever. He has been to the emergency department 4 times during the past 6 months for treatment of asthma exacerbations. His 9-month-old sister was treated for bronchiolitis a week ago. His father has allergic rhinitis. Current medications include an albuterol inhaler and a formoterol-fluticasone inhaler. He appears in mild distress. His temperature is 37.5°C (99.5°F), pulse is 101/min, respirations are 28/min, and blood pressure is 86/60 mm Hg. Examination shows mild intercostal and subcostal retractions. Pulmonary examination shows decreased breath sounds and mild expiratory wheezing throughout the right lung field. Cardiac examination shows no abnormalities. An x-ray of the chest shows hyperlucency of the right lung field with decreased pulmonary markings. Which of the following is the next best step in management?

A 70-year-old man comes to the physician because of intermittent shortness of breath while going up stairs and walking his dog. It began about 1 month ago and seems to be getting worse. He has also developed a dry cough. He has not had any wheezing, fevers, chills, recent weight loss, or shortness of breath at rest. He has a history of Hodgkin lymphoma, for which he was treated with chemotherapy and radiation to the chest 7 years ago. He also has hypertension, for which he takes lisinopril. Ten years ago, he retired from work in the shipbuilding industry. He has smoked half a pack of cigarettes daily since the age of 21. Vital signs are within normal limits. On lung auscultation, there are mild bibasilar crackles. A plain x-ray of the chest shows bilateral ground-glass opacities at the lung bases and bilateral calcified pleural plaques. Which of the following is the greatest risk factor for this patient's current condition?

A 14-year-old boy presents to an urgent care clinic complaining of a runny nose that has lasted for a few weeks. He also reports sneezing attacks that last up to an hour, nasal obstruction, and generalized itching. He has similar episodes each year during the springtime that prevent him from going out with his friends or trying out for sports. His younger brother has a history of asthma. Which of the following diseases has a similar pathophysiology?