A client is diagnosed with a large pulmonary embolism. When explaining what has happened to cause respiratory distress to the client's family, which information will the nurse include?
Thick secretions in your small airways are blocking air from moving into the small air sacs in your lungs
Blood flow through some areas of your lungs is decreased even though you are taking adequate breaths
Large areas of your lungs are getting good blood flow but are not receiving enough air to fill the small air sacs
Oxygen transfer into the blood is slow because of thick membranes between the small air sacs and the lung circulation
The Correct Answer is B
Choice A reason: Thick secretions blocking airways are characteristic of conditions like chronic obstructive pulmonary disease or pneumonia, not pulmonary embolism. In pulmonary embolism, a clot obstructs pulmonary arteries, reducing blood flow to alveoli, not airflow. This leads to ventilation-perfusion mismatch, causing hypoxemia despite adequate breathing, making this explanation incorrect.
Choice B reason: A pulmonary embolism blocks pulmonary arteries, reducing blood flow to certain lung regions despite normal ventilation. This creates a ventilation-perfusion mismatch, where alveoli are ventilated but not perfused, leading to hypoxemia and respiratory distress. This is the primary mechanism of pulmonary embolism, making it the correct explanation for the family.
Choice C reason: This option suggests adequate blood flow but inadequate air to alveoli, which describes conditions like airway obstruction or atelectasis, not pulmonary embolism. In pulmonary embolism, the issue is reduced blood flow due to arterial obstruction, not insufficient air reaching alveoli, as breathing remains adequate, making this incorrect.
Choice D reason: Thickened alveolar-capillary membranes, impairing oxygen diffusion, occur in conditions like pulmonary fibrosis or edema, not pulmonary embolism. In pulmonary embolism, the primary issue is vascular obstruction, not membrane thickness, leading to reduced perfusion and hypoxemia despite normal alveolar structure, rendering this explanation scientifically inaccurate.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Pulmonary embolism causes chest pain and diaphoresis but typically presents with tachycardia, dyspnea, and normal or non-specific ECG changes, not ST-segment elevation. The latter is specific to myocardial ischemia, making pulmonary embolism less likely. Embolism affects pulmonary circulation, not coronary arteries, which are implicated in the described ECG findings.
Choice B reason: Acute myocardial infarction presents with chest pain, diaphoresis, and ST-segment elevation on ECG, indicating acute coronary artery occlusion leading to myocardial ischemia. This is a life-threatening emergency requiring immediate intervention like percutaneous coronary intervention. The symptoms and ECG findings align with myocardial infarction, making it the most likely diagnosis.
Choice C reason: Pericarditis causes chest pain, often pleuritic, and may cause diaphoresis, but ECG typically shows diffuse ST-segment elevation, not localized as in myocardial infarction. Pericarditis is less likely to cause acute, severe ischemic symptoms. The specific ST elevation and symptoms point to coronary occlusion, not pericardial inflammation.
Choice D reason: Aortic dissection causes severe, tearing chest pain and may cause diaphoresis, but ECG is usually normal or shows non-specific changes, not ST-segment elevation. Dissection affects the aorta, not coronary arteries, making it less likely. The ECG findings and symptoms strongly suggest myocardial infarction over aortic dissection.
Correct Answer is A
Explanation
Choice A reason: Evaluating chest expansion assesses breathing, the second priority in the ABCDE approach. Trauma from a motor vehicle crash may cause rib fractures, pneumothorax, or hemothorax, impairing ventilation. Unequal or absent expansion indicates a life-threatening issue, requiring immediate intervention like chest tube placement to restore adequate respiration.
Choice B reason: Assessing capillary refill evaluates peripheral perfusion, a circulation parameter in the ABCDE approach. While important, it is secondary to airway and breathing. Trauma patients may have shock, but chest injuries affecting ventilation (e.g., pneumothorax) are more immediate threats, making chest expansion the first assessment to ensure respiratory function.
Choice C reason: Checking pupillary response assesses neurological status (disability in ABCDE), relevant for head trauma. However, breathing takes precedence over neurological assessment in trauma patients. Chest injuries can cause rapid respiratory failure, making chest expansion evaluation critical to identify life-threatening conditions like flail chest or pneumothorax before neurological checks.
Choice D reason: Checking orientation to place and time assesses neurological function, part of the disability component in ABCDE. While important in trauma, it is secondary to airway and breathing. Chest injuries from a crash can compromise ventilation, making chest expansion the priority to detect and address immediate respiratory threats before neurological evaluation.
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