Doppler mitral inflow variables time course after treadmill stress echo with and without ischemic response

Area of Science:

• Cardiology
• Echocardiography
• Diastolic Function Assessment

Background:

• Assessing diastolic dysfunction post-exercise is crucial for cardiovascular health.
• Treadmill stress echocardiography (TSE) is a common diagnostic tool.
• Doppler mitral inflow variables provide insights into diastolic function.

Purpose of the Study:

• To evaluate changes in Doppler mitral inflow variables from rest to post-exercise.
• To compare these changes between subjects with and without ischemic response (IR).
• To determine the utility of these variables in detecting ischemia-induced diastolic dysfunction.

Main Methods:

• 104 subjects underwent treadmill stress echo (TSE) testing.
• Doppler mitral inflow variables (peak E-wave velocity [∆E], deceleration rate [∆DR], peak A-wave velocity [∆A]) were measured at rest and post-exercise.
• Time from exercise cessation to imaging (TIME) was recorded; correlations with IR and TIME were analyzed.

Main Results:

• ∆E and ∆DR changes were significantly larger in ischemic subjects compared to nonischemic subjects.
• A significant interaction between TIME and IR was observed for ∆E and ∆DR.
• Differences in ∆E and ∆DR between groups became significant at TIME ≥ 3 minutes post-exercise.

Conclusions:

• Time courses of ∆E and ∆DR post-exercise differ significantly between subjects with and without IR.
• ∆E and ∆DR do not differ at exercise cessation but diverge over time, aiding ischemia detection.
• Divergent recovery patterns of ∆E and ∆DR show promise for detecting diastolic dysfunction caused by ischemia.