Dipyrone improves small airway function in asthmatic patients with moderate obstruction

Area of Science:

• Pharmacology
• Respiratory Medicine
• Clinical Trials

Background:

• Dipyrone, an analgesic and antipyretic, exhibits spasmolytic effects on smooth muscles.
• Previous in vitro studies demonstrated dipyrone's ability to relax guinea pig tracheal smooth muscle.

Purpose of the Study:

• To evaluate the in vivo effects of dipyrone on respiratory function in asthma patients.
• To determine if dipyrone's spasmolytic properties translate to improved lung function in asthmatics.

Main Methods:

• Twenty-two asthma patients underwent pulmonary function tests before and after oral dipyrone (1g).
• Tests were repeated during spontaneous recovery after a washout period to control for dipyrone's effects.
• Patients were categorized by baseline forced expiratory volume in 1 second (FEV1) indicating mild or moderate obstruction.

Main Results:

• Dipyrone significantly improved FEV1 and peak expiratory flow rates in patients with moderate asthma.
• Improvements were observed in small airway function parameters, including maximum midexpiratory flow rate.
• No significant changes were noted during spontaneous recovery, highlighting dipyrone's specific effect.

Conclusions:

• Dipyrone demonstrated a significant positive impact on small airway function in moderate asthma.
• These in vivo findings support previous in vitro observations of dipyrone's spasmolytic action.