A 70-year-old female presents with acute onset of severe shortness of breath, anxiety, and a feeling of impending doom. She is afebrile, and her SpO2 is 92% on room air. Auscultation reveals diffuse wheezing bilaterally, without crackles. She has no history of asthma or COPD. What is the MOST likely cause of her respiratory distress?
- AAcute asthma exacerbation.
- BAcute myocardial infarction with pulmonary edema.
- CAnaphylactic reaction.
- DPulmonary embolism.
Show answer & explanationAnswer & explanation
Correct answer: D. Pulmonary embolism.
The sudden onset of severe dyspnea, anxiety, and feeling of impending doom, coupled with normal lung sounds (or diffuse wheezing without crackles) and relatively preserved oxygenation initially, in an afebrile patient without a history of reactive airway disease, is highly suggestive of pulmonary embolism (PE). While MI with pulmonary edema would have crackles, anaphylaxis would have hives/angioedema, and asthma would have a history and prominent wheezing.
Why the other options are wrong
- A. Acute asthma exacerbation would be unlikely in a patient with no history of asthma or COPD and would typically have more pronounced wheezing and often a lower SpO2 for severe distress.
- B. Acute MI with pulmonary edema would typically present with crackles (rales) due to fluid in the lungs, not diffuse wheezing without crackles.
- C. Anaphylactic reaction would involve systemic signs like urticaria, angioedema, and possibly hypotension, which are not described.
Pulmonary Embolism Presentation
Pulmonary embolism (PE) is a life-threatening condition caused by a blood clot (embolus) lodging in the pulmonary arteries. Its presentation can be varied but often includes sudden onset dyspnea, pleuritic chest pain, anxiety, and a feeling of impending doom, sometimes with relatively clear lung sounds.
- Classic triad: dyspnea, chest pain, hemoptysis (infrequent).
- Often presents with sudden onset symptoms out of proportion to physical exam.
- Risk factors: immobility, surgery, cancer, oral contraceptives, previous DVT/PE.
- Physical exam: tachycardia, tachypnea, sometimes clear lung sounds, or non-specific wheezing/crackles.
Memory trick: Sudden doom, clear lungs, no asthma? PE's the silent drama.