The physiologic responses producing clinical findings specific to a tension pneumothorax are
rising intrathoracic pressure and increased cardiac output.
decreasing intrathoracic pressure and decreased cardiac output.
rising intrathoracic pressure and decreased stroke volume.
decreasing intrathoracic pressure and increased stroke volume.
The Correct Answer is C
A. rising intrathoracic pressure and increased cardiac output: Increased intrathoracic pressure in tension pneumothorax actually compresses the heart and great vessels, reducing cardiac output rather than increasing it.
B. decreasing intrathoracic pressure and decreased cardiac output: Tension pneumothorax is characterized by rising, not decreasing, intrathoracic pressure, so this does not accurately describe the physiology.
C. rising intrathoracic pressure and decreased stroke volume: Air trapped in the pleural space increases intrathoracic pressure, compressing the vena cava and heart. This reduces venous return, decreases stroke volume, and can lead to hypotension and shock, explaining the hallmark clinical findings.
D. decreasing intrathoracic pressure and increased stroke volume: Lower intrathoracic pressure would facilitate venous return, which is opposite of the pathophysiology in tension pneumothorax. This does not reflect the clinical scenario.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Turn off ventilator alarms when suctioning client: Ventilator alarms are safety features that alert the nurse to changes in airway pressure or ventilation status. Turning them off can prevent timely detection of serious complications such as disconnection or obstruction, so this action is unsafe and not recommended.
B. Suction the client every hour: Routine suctioning on a fixed schedule can cause mucosal trauma, hypoxia, and infection. Suctioning should be performed only as needed, based on clinical assessment such as increased secretions, rhonchi, or decreased oxygen saturation.
C. Check for presence of bilateral breath sounds at least every two to four hours: Regular assessment of breath sounds ensures that both lungs are adequately ventilated and helps detect complications such as atelectasis, pneumothorax, or tube displacement. This is a critical ongoing intervention to maintain patient safety on a mechanical ventilator.
D. Keep the client's hands restrained: Restraints may sometimes be necessary to prevent accidental extubation, but they are not an essential intervention for all ventilated clients. Use of restraints should be minimized and based on individual risk assessment rather than applied routinely.
Correct Answer is D
Explanation
A. Can you describe the quality of your chest pain?: While important for initial assessment and differentiating types of chest pain, the quality of pain does not determine eligibility for fibrinolytic therapy.
B. Do you take aspirin on a daily basis?: Daily aspirin use is relevant for antiplatelet therapy but does not determine candidacy for fibrinolytic treatment. It may influence bleeding risk, but timing of symptom onset is more critical.
C. Is there any family history of heart disease?: Family history provides information on risk factors but does not impact the immediate decision regarding fibrinolytic therapy.
D. What time did your chest pain begin?: Fibrinolytic therapy is most effective when administered within a specific time window, typically within 12 hours of symptom onset. Determining the onset of chest pain is essential to establish whether the client is a candidate for thrombolytic treatment and to maximize benefit while minimizing risk.
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