Related Experiment Videos
The effect of atrial pacing on the mitral echocardiogram of mitral stenosis recorded simultaneously with haemodynamic
Insights
Atrial pacing in mitral stenosis limits the measurement of diastolic closure rate (E-F) to heart rates of 80 bpm or less. Above this, only post-atrial systolic closure (A-B) is measurable, unlike in sinus rhythm.
Area of Science:
- Cardiology
- Echocardiography
- Cardiac Electrophysiology
Background:
- Mitral stenosis diagnosis relies on accurate echocardiographic measurements.
- Understanding hemodynamic changes during altered heart rhythms is crucial for patient management.
Purpose of the Study:
- To investigate the impact of atrial pacing on mitral valve echocardiographic measurements in mitral stenosis.
- To compare the measurability of diastolic closure rate (E-F) and post-atrial systolic closure (A-B) during atrial pacing versus sinus rhythm.
Main Methods:
- Simultaneous mitral echocardiograms and hemodynamic data were recorded in six mitral stenosis patients.
- Atrial pacing was employed to control heart rate.
- Measurements of diastolic closure rate (E-F) and post-atrial systolic closure (A-B) were analyzed at varying heart rates.
Main Results:
- Diastolic closure rate (E-F) was measurable only up to 80 bpm during atrial pacing due to P-R interval prolongation.
- At heart rates ≤ 80 bpm, E-F remained consistent in both sinus rhythm and atrial pacing.
- Above 80 bpm, E-F became unmeasurable, with post-atrial systolic closure (A-B) being the only available metric, and it was higher than the corresponding E-F values.
Conclusions:
- Atrial pacing significantly affects the echocardiographic assessment of mitral stenosis by limiting the measurable range of the diastolic closure rate (E-F).
- Post-atrial systolic closure (A-B) may serve as an alternative, albeit higher, measurement above 80 bpm during atrial pacing.
- These findings highlight the importance of considering heart rhythm and pacing in the echocardiographic evaluation of mitral stenosis severity.
Abstract:
Simultaneous mitral echocardiograms and haemodynamic data were recorded in six cases of mitral stenosis during atrial pacing. Due to the prolongation of the P-R interval during atrial pacing, the diastolic closure rate E-F was measurable up to a heart rate of 80 per min. only. At a heart rate of 80 or less, both in sinus rhythm and during atrial pacing the diastolic closure rate remained essentially the same in each case. However, above 80/min E-F became too short and post-atrial systolic closure A-B only was available for measurement which was higher in each case than its corresponding E-F value. This contrasts with cases with sinus rhythm where the diastolic closure rate E-F measurable up to a heart rate of 110 per minute.