Related Experiment Video
Updated: May 2, 2026
Author Spotlight: Assessing the Cardiovascular Profile of Patients with Metabolic Syndrome
Published on: September 27, 2024
Aortic pressure-velocity loop: a potential tool for assessing risk associated with midsystolic forward compression
Shizuo Hanya1, Hajime Yamakage2, Yukiyoshi Kondoh1
1Department of Cardiovascular Science, The Heart Institute of Japan, Tokyo Women's Medical University, 8-1 Kawada-cho, Shinjuku-ku, Tokyo, 162-8666, Japan.
Insights
Chronic atherosclerotic coronary artery disease (CAD) impairs heart-artery interaction, relying on a specific wave pattern for blood flow. Aortic pressure-velocity loop analysis may help diagnose CAD in chronic ischemic heart disease.
Area of Science:
- Cardiovascular Physiology
- Hemodynamics
- Diagnostic Cardiology
Background:
- Chronic ischemic heart disease (CIHD) can stem from stable chronic obstructive coronary artery disease (CAD).
- Understanding ventriculo-aortic interaction is crucial for diagnosing CIHD subtypes.
- Wave intensity and pressure-velocity (PU) loop analyses offer insights into cardiovascular dynamics.
Purpose of the Study:
- To determine if impaired ventriculo-aortic interaction characterizes CIHD due to stable CAD.
- To investigate the role of wave intensity and PU-loop parameters in differentiating CAD from non-CAD CIHD.
Main Methods:
- Retrospective observational study involving invasive hemodynamic assessment.
- Analysis of wave intensity-derived indices: initial PU-loop slope (S1), second ascending slope (S2), backward compression wave (BCW), and midsystolic forward compression wave (m-FCW).
- Receiver operating characteristic (ROC) curve analysis to assess discriminatory ability for CAD.
Main Results:
- CAD patients exhibited higher S2 values and relied on m-FCW for midsystolic flow, unlike non-CAD CIHD patients who depended on blood inertia.
- S2 strongly correlated with the relative magnitude of m-FCW (r = -0.936, P < 0.001).
- The relative magnitude of m-FCW and the S2:S1 ratio showed high discriminatory ability for CAD (AUC 0.976 and 0.986, respectively).
Conclusions:
- Chronic atherosclerotic CAD is associated with impaired ventriculo-aortic interaction, characterized by compensatory m-FCW.
- Aortic PU-loop parameters, especially the S2:S1 ratio, show potential as diagnostic markers for distinguishing CAD in CIHD.
Study Objective:
To evaluate whether impaired ventriculo-aretrial interaction characterizes chronic ischemic heart disease (CIHD) caused by stable chronic obstructive coronary artery disease (CAD), using wave intensity and aortic pressure-velocity (PU) loop analyses.
Design:
Retrospective observational study.
Setting:
Single-center invasive hemodynamic assessment using high-fidelity multisensor catheters.
Participants:
Thirty-one patients with CIHD, including 21 with chronic atherosclerotic CAD and 10 with non-CAD CIHD.
Interventions:
None.
Main Outcome Measures:
Wave intensity-derived indices of ventriculo-arterial interaction, including the initial PU-loop slope (S1), second ascending slope (S2), backward compression wave (BCW), midsystolic forward compression wave (m-FCW), and their relative magnitudes. Discriminatory ability for CAD was assessed using receiver operating characteristic (ROC) curve analysis.
Results:
In CAD patients, midsystolic flow was supported by a previously unreported m-FCW that emerged in response to an early-onset BCW during ventricular acceleration, reflected by higher S2 values. In contrast, midsystolic flow in non-CAD CIHD patients was primarily maintained by blood inertia and lower S1 values. S2 strongly correlated with the relative magnitude of m-FCW (r = -0.936, P < 0.001). The relative magnitude of m-FCW showed greater discriminatory ability for CAD than BCW (AUC 0.976 vs. 0.771). The S2:S1 ratio correlated closely with the relative magnitude of m-FCW and demonstrated the highest AUC (0.986).
Conclusions:
Chronic atherosclerotic CAD is characterized by impaired ventriculo-aortic interaction, with midsystolic flow dependent on compensatory m-FCW rather than blood inertia. Aortic PU-loop parameters, particularly the S2:S1 ratio, may provide a potential diagnostic marker for distinguishing chronic atherosclerotic CAD from other forms of CIHD.
Related Concept Videos
01:22Aortic Regurgitation II: Clinical Features and Diagnostic Tests
01:15Aortic Regurgitation I: Introduction
01:17Measurement of Blood Pressure
01:21Aneurysm II: Clinical Manifestations and Diagnostic Studies
01:19Assessing Blood pressure using a doppler ultrasound
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment: