Intra-articular triamcinolone acetonide improves lung function in horses with severe asthma

Area of Science:

• Equine medicine
• Respiratory medicine
• Pharmacology

Background:

• Corticosteroids are frequently administered intra-articularly for joint diseases in horses.
• These corticosteroids are also potent treatments for equine asthma.
• A hypothesis exists that intra-articular corticosteroids may improve lung function in asthmatic horses.

Purpose of the Study:

• To compare the effects of intra-articular (IA) versus intramuscular (IM) triamcinolone acetonide (TA) on lung function in horses with severe asthma.

Main Methods:

• A randomized, controlled experiment was conducted on asthma-prone horses.
• Horses received either IA TA (40 mg total) or IM TA (40 mg).
• Lung function and TA serum concentrations were monitored weekly for 35 days.

Main Results:

• Both IA and IM TA significantly decreased pulmonary resistance and elastance by days 7 and 14, respectively.
• Lung function improvements persisted for up to 28 days in both groups.
• TA serum concentrations were often below quantification limits by day 7, with no significant difference between IA and IM administration.

Conclusions:

• Intra-articular administration of TA effectively improves lung function in horses with severe asthma.
• This improvement occurs even when TA serum concentrations are below established thresholds.
• The study highlights a potential for masking equine asthma symptoms with joint corticosteroid treatments.