Related Experiment Videos
Atrioventricular conduction time in rheumatoid arthritis
Insights
Women with rheumatoid arthritis (RA) show a prolonged P-R interval, indicating slower atrioventricular conduction. This finding, while not pathological, may be influenced by RA treatments like chloroquine or corticosteroids.
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.
Abstract:
The atrioventricular conduction time (P-R interval) was determined in 189 women and 90 men with rheumatoid arthritis (RA). Only three women and one man were found to have pathological prolongation of the P-R interval. However, a significant prolongation of the P-R interval, within normal range, was seen in women with RA compared with healthy controls. Apart from the relation to radiographically enlarged heart, prolonged P-R interval showed no association with other signs of RA and had no prognostic implications in the follow-up period (mean 5.4 years). Current chloroquine therapy delayed the atrioventricular conduction while corticosteroids accelerated it.