- General features of the episode: Potential triggers, severity, duration, associated symptoms (especially cough, hemoptysis, fever, lightheadedness, palpitations, chest tightness, chest pain or pressure)
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- Subjective paresthesias or carpopedal spasm
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- Psychological symptoms such as agitation, anxiety, and/or fear
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- Usual exercise tolerance compared with current symptoms
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- Prior similar episodes of dyspnea as well as triggers and duration of those episodes
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- History of respiratory disease (eg, asthma, COPD, pneumothorax)
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- Recent surgery, immobilization, prior or familial thromboembolic disease
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- Recent travel that might be a risk factor for venous thromboembolism or infection
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- Ingestion of medications, including ASA, NSAID, antibiotics, ACEI
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- Oral or inhalational exposure to potential toxins (eg, methanol, ethylene glycol, carbon monoxide, organophosphates, cocaine)
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- Trauma that might have caused pneumothorax, lung contusion, airway injury
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- Any treatments or interventions provided for previous episodes of hyperventilation
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- Any prior testing for conditions causing hyperventilation (including for hyperventilation syndrome)
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