Intravenous magnesium sulfate for bronchial hyperreactivity: a randomized, controlled, double-blind study.

These studies showed that perennial exposure to allergens was an important cause of inflammation in the lungs and associated nonspecific bronchial hyperreactivity (Figure 1).

The obstruction can be due to mucus or other secretions in the airway, bronchial hyperreactivity, or tumors.

Methacholine is primarily used to diagnose bronchial hyperreactivity, which is the hallmark of asthma and also occurs in chronic obstructive pulmonary disease.

Thus there is a real possibility that some forms of childhood behavior-TV, videos, computer games, etc.-might be associated with sigh rates low enough to increase non-specific bronchial hyperreactivity.

A non-specific bronchial hyperreactivity test involves testing with methacoline, after which the Forced Expiratory Volume in 1 second (FEV) of the patient is measured.