Atrioventricular conduction time in rheumatoid arthritis.

Area of Science:

• Cardiology
• Rheumatology
• Pharmacology

Background:

• Rheumatoid arthritis (RA) is a systemic autoimmune disease that can affect the cardiovascular system.
• Atrioventricular (AV) conduction, measured by the P-R interval, is a key indicator of cardiac electrical activity.
• Previous studies have suggested potential cardiac involvement in RA, but AV conduction specifically requires further investigation.

Purpose of the Study:

• To investigate atrioventricular conduction time (P-R interval) in patients with rheumatoid arthritis (RA).
• To compare P-R intervals in RA patients with healthy controls.
• To explore associations between prolonged P-R intervals and RA characteristics, cardiac findings, and prognostic implications, as well as the impact of specific RA therapies.

Main Methods:

• Determined the atrioventricular conduction time (P-R interval) in a cohort of 189 women and 90 men diagnosed with rheumatoid arthritis.
• Compared P-R intervals in RA patients against a control group of healthy individuals.
• Analyzed correlations between P-R interval duration and radiographic evidence of enlarged heart, other RA signs, and long-term prognostic outcomes (mean follow-up 5.4 years).
• Assessed the effects of chloroquine and corticosteroid therapies on atrioventricular conduction.

Main Results:

• Pathological prolongation of the P-R interval was rare (3 women, 1 man).
• A statistically significant, yet non-pathological, prolongation of the P-R interval was observed in women with RA compared to healthy controls.
• Prolonged P-R intervals were associated with a radiographically enlarged heart but showed no correlation with other RA indicators or prognostic significance over the follow-up period.
• Chloroquine therapy was associated with delayed AV conduction, while corticosteroids appeared to accelerate it.

Conclusions:

• Women with rheumatoid arthritis exhibit a subtle prolongation in atrioventricular conduction time (P-R interval) compared to healthy individuals.
• This P-R interval prolongation in RA is generally within normal limits and lacks significant prognostic value, although it may relate to cardiac enlargement.
• Specific rheumatoid arthritis medications, chloroquine and corticosteroids, exert opposing effects on atrioventricular conduction, highlighting the need to consider pharmacological influences on cardiac electrophysiology in RA management.