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Distal coronary flow velocity immediately after direct angioplasty for acute myocardial infarction
M Nakamura1, T Tsunoda, T Wakatsuki
1Third Department of Internal Medicine, Ohashi Hospital, Toho University School of Medicine, Tokyo, Japan.
Insights
Coronary flow dynamics in infarct arteries remain abnormal post-angioplasty. Phasic flow assessment, using the diastolic to systolic flow ratio (DSVR), effectively evaluates microcirculation disturbances after acute myocardial infarction treatment.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Physiology
Background:
- Coronary artery disease management often involves angioplasty to restore blood flow.
- Assessing microcirculatory function post-intervention is crucial for predicting outcomes.
- Direct angioplasty aims to improve coronary flow dynamics in infarct arteries.
Purpose of the Study:
- To evaluate coronary flow dynamics after direct angioplasty.
- To identify determinants of flow-velocity variables in infarct-related arteries.
- To assess the utility of phasic coronary flow in evaluating microcirculation post-angioplasty.
Main Methods:
- Coronary flow velocity was measured using a Doppler guidewire in 36 infarct arteries and 64 normal coronary arteries.
- Phasic coronary flow was analyzed, defining normal flow by the diastolic to systolic flow ratio (DSVR).
- Infarct arteries were categorized into normal DSVR and low DSVR groups based on post-angioplasty measurements.
Main Results:
- Coronary flow velocity variables in infarct arteries did not normalize even after successful direct angioplasty.
- Phasic coronary flow in infarct arteries exhibited significant variability.
- Low DSVR was associated with reduced diastolic peak velocity, preserved systolic velocity, angiographic slow flow, and late recanalization.
Conclusions:
- Direct angioplasty does not fully restore normal coronary flow dynamics in infarct arteries.
- The diastolic to systolic flow ratio (DSVR) is a valuable indicator of disturbed microcirculation post-angioplasty.
- Phasic flow assessment provides insights into microcirculatory function following direct angioplasty for acute infarction.
Abstract:
To evaluate coronary flow dynamics after direct angioplasty and to define the determinants of flow-velocity variables in the infarct artery, we measured coronary flow velocity in 36 infarct arteries and 64 normal coronary arteries by using a Doppler guide wire. Flow-velocity variables in the infarct arteries did not return to normal even after successful direct angioplasty, and phasic coronary flow in infarct arteries varied considerably. Normal phasic flow was calculated as the ratio of diastolic to systolic flow ratio (DSVR) of greater than or equal to mean DSVR - 1 SD in normal coronary arteries. Infarct-related arteries were divided into two groups: normal DSVR (n = 28) and low DSVR (n = 8). Reduced diastolic peak velocity with a relative preservation of systolic velocity contributed to a low DSVR flow. Angiographic slow flow and late recanalization were significantly related to low DSVR flow. Thus the extent of disturbed microcirculation can be evaluated by assessing phasic flow after direct angioplasty for acute infarction.