asthmatic attack造句怎么写

Viral infections are associated with up to 50% of asthmatic attacks in children.

Objective To evaluate the clinical value of bi-phasic positive airway pressure (Bi-PAP) in severe asthmatic attack patients after thoracic operation.

Intrinsic asthma: asthmatic attacks are precipitated by respiratory infections, exposure to cold, exercise, stress, inhaled irritants, and drugs such as aspirin.