Related Experiment Videos
Noninvasive analysis of coronary artery poststenotic flow characteristics by using transthoracic echocardiography
1Regional Cardiac Unit, Papworth Hospital, Cambridge, United Kingdom.
Insights
Transthoracic echocardiography can detect coronary flow velocity in the left anterior descending artery. Severe stenosis reduces diastolic blood flow, aiding noninvasive assessment of coronary artery disease.
Area of Science:
- Cardiovascular Medicine
- Diagnostic Imaging
- Hemodynamics
Background:
- Coronary artery disease (CAD) diagnosis often relies on invasive procedures.
- Noninvasive methods for assessing coronary stenosis significance are valuable.
- Left anterior descending (LAD) artery hemodynamics provide insight into myocardial perfusion.
Purpose of the Study:
- To evaluate transthoracic echocardiography for detecting LAD coronary flow velocity distal to stenoses.
- To noninvasively assess coronary artery hemodynamics in the LAD distal to stenoses.
- To determine the utility of echocardiography in assessing the significance of LAD stenosis.
Main Methods:
- High-frequency transthoracic echocardiography was employed.
- Blood velocity patterns in the distal LAD were assessed in 128 patients undergoing cardiac catheterization.
- Patients were categorized by LAD stenosis severity: unobstructed (<30%), moderate (30%-70%), and severe (>70%).
Main Results:
- Doppler velocity patterns were obtained in 52% of patients.
- No significant differences in systolic blood velocity were observed across stenosis severity groups.
- Severe LAD stenosis was associated with reduced diastolic blood flow velocity compared to less severe stenoses.
Conclusions:
- Transthoracic echocardiography can detect coronary flow velocity in the LAD.
- Reduced diastolic flow velocity in the LAD is indicative of significant stenosis.
- This echocardiographic technique shows promise for noninvasive assessment of LAD stenosis significance and intervention outcomes.
Abstract:
This study was performed (1) to test whether transthoracic echocardiography may detect coronary flow velocity in the left anterior descending coronary artery distal to stenoses; and (2) to noninvasively assess coronary artery hemodynamics distal to coronary artery stenoses. High-frequency transthoracic echocardiography was used to assess blood velocity patterns in the distal segment of the left anterior descending coronary artery of 128 consecutive patients (mean age, 58 +/- 9 years; 97 men and 31 women) who underwent cardiac catheterization for investigation of angina. Biphasic, diastolic predominant Doppler velocity patterns were obtained in 67 patients (52%). There was no significant difference in any measurements of systolic blood velocity between patients with unobstructed (less than 30% stenosis) left anterior descending coronary artery, moderate stenosis (30% to 70% obstruction), or severe stenosis (more than 70% obstruction). Patients with severe stenosis demonstrated a reduction in the diastolic component of blood flow velocity in the distal left anterior descending coronary artery compared with patients in the other two groups. This technique may be useful for the noninvasive assessment of the significance of stenotic left anterior descending coronary artery disease or the outcome of interventional procedures.