Which symptom can indicate bronchospasm during diagnosis?

Expiratory wheeze and difficulty in positive pressure ventilation are key indicators of bronchospasm during a diagnosis. Wheezing occurs due to the narrowing of the airways, which makes it challenging for air to flow out of the lungs, creating a characteristic high-pitched sound during expiration. This symptom primarily arises because of the constriction and inflammation of the bronchial tubes, leading to difficulty in breathing.

Furthermore, patients experiencing bronchospasm may have significant difficulty with positive pressure ventilation, as the increased resistance in the airways requires higher pressure to deliver adequate oxygen and ventilation. This would manifest in clinical settings, such as when using bag-mask ventilation or during the administration of anesthetics, where the airflow is restricted, making it hard for practitioners to provide effective respiratory support.

The other options present symptoms that could indicate different conditions or complications but are not specifically linked to bronchospasm. For example, stridor is typically associated with upper airway obstruction, while high fever and pallor relate more to systemic infections. A dry cough and fatigue may suggest respiratory or pulmonary conditions, but they do not specifically indicate bronchospasm as clearly as an expiratory wheeze would.