In this clinical scenario, what key symptom did the patient report starting at rest?

The key symptom reported by the patient is shortness of breath, which can be particularly significant when it occurs at rest. This symptom is often indicative of underlying cardiovascular or respiratory conditions, such as heart failure, pulmonary embolism, or chronic obstructive pulmonary disease (COPD). When a patient experiences shortness of breath at rest, it usually suggests a more severe level of impairment, as opposed to dyspnea occurring only during exertion, which may indicate a milder degree of underlying disease. In clinical practice, the onset of resting shortness of breath raises concerns for acute conditions requiring prompt evaluation and management, worsening chronic illnesses, or significant functional limitations. Understanding this symptom helps clinicians prioritize preventative measures, diagnostics, and treatment options effectively.