His head, eyes, ears, nose, and throat examinations are unremarkable. His cardiac examination is normal. On examination of his chest, the diameter seems enlarged. Breath sounds are decreased throughout all lobes. Rhonchi are heard over all lung fields. There is no area of dullness and no increased or decreased fremitus. What thorax or lung disorder is most likely causing his symptoms?

Correct Answer: B

Rationale: The patient's presentation with an enlarged chest diameter, decreased breath sounds throughout all lobes, and the presence of rhonchi over all lung fields is suggestive of a chronic condition that affects the entire respiratory system. These findings are classic for COPD, a progressive lung disease characterized by airflow limitation. The breath sounds are decreased due to airflow obstruction, and the presence of rhonchi indicates mucus production and airway inflammation commonly seen in COPD. In contrast, a spontaneous pneumothorax would typically present with sudden chest pain and shortness of breath, often in a younger patient with risk factors such as smoking. Asthma would present with wheezing, shortness of breath, and possibly a history of atopy or allergies. Pneumonia would typically present with fever, cough, and focal findings on chest examination, such as crackles or bronchial breath sounds over a consolidated area. In

Correct Answer: B

Rationale: Orthopnea is a symptom characterized by difficulty breathing while lying flat that improves when sitting or standing upright. This symptom is specifically related to cardiovascular conditions, such as heart failure, in which fluid accumulates in the lungs when lying down. Considering the patient's complaint of breathlessness with activity and the need to assess for cardiovascular issues, asking about orthopnea would be most appropriate to gain insights into potential heart-related causes of the symptoms. Abdominal pain (A), hematochezia (C), and tenesmus (D) are not typically associated with cardiovascular conditions and are less relevant to the patient's presentation.

Correct Answer: B

Rationale: At the start of diastole, the ventricles relax and begin to fill with blood from the atria. As this relaxation phase begins, the pulmonic valve opens to allow blood to flow from the right ventricle to the pulmonary artery and then to the lungs for oxygenation. This marks the beginning of diastole, the period of the cardiac cycle when the heart is filling with blood. The closure of the tricuspid valve, closure of the aortic valve, and production of the first heart sound (S1) occur during systole, the phase of the cardiac cycle when the heart is contracting to pump blood out to the body.

Correct Answer: D

Rationale: To hear a soft murmur or bruit clearly, it is important to minimize any background noise or distractions that may interfere with your ability to auscultate effectively. Therefore, asking the patient to hold her breath (choice A) can help reduce noise caused by the patient's respiration. Asking the patient in the next bed to turn down the TV (choice B) can also help eliminate external noise that may disrupt your ability to hear subtle sounds. Checking your stethoscope for air leaks (choice C) is crucial to ensure that you are hearing sounds accurately and not being affected by any equipment issues. By combining these strategies, you can create an optimal environment for listening to soft murmurs or bruits.

Correct Answer: D

Rationale: Given the description provided, the lesion appears to be a dermatofibroma. Dermatofibromas are common benign skin lesions that typically present as a firm, solitary nodule on the skin. They commonly occur on the lower extremities but can also be found on the trunk. The characteristics of a dermatofibroma include being firm to the touch, having regular borders, being evenly pigmented, and a diameter typically less than 1 cm to 2 cm. They are usually painless and do not change significantly over time.