-
Pulse wave velocity, or PWV, describes how fast the pressure and flow pulse from each heartbeat travels along the arteries. A common way to estimate PWV is to measure the pulse at two locations and compute distance divided by transit time. PWV is widely used because it correlates with arterial stiffness. When arteries are stiffer,…
-
Impedance matching is an engineering concept that describes how well an energy source is adapted to its load. In electrical systems, a source such as an amplifier has an internal opposition to current flow, its internal impedance, and the load, such as an antenna, a cable, or another circuit, has its own impedance. When these…
-
When the ventricle ejects, it generates a pressure and flow wave that propagates along the pulmonary or arterial tree. Pressure and flow do not transmit instantaneously through the circulation but travel at finite speed in the form of waves. Spatial variations in vessel diameter, wall stiffness, branching patterns, and distal terminations create a distributed, time-dependent…
-
In the analysis of cardiovascular waveforms, certain derived variables maintain their value under transformations of the signal. These invariants are of particular interest because they offer robustness to variations in signal acquisition, calibration, and sampling. Invariant features are especially valuable in clinical research and automated signal processing, where measurement conditions often differ across devices, sites,…
-
Invasive measurement of physiological pressure, particularly arterial or intracardiac pressure, is a central component of critical care and anesthetic monitoring. These measurements provide real-time information about cardiovascular function and are essential for guiding treatment in unstable patients. The accuracy of such measurements depends not only on the placement of the catheter but also on the…
-
We’re excited to announce the next major update to the Hemodynamix Online Analyzer, designed to support advanced hemodynamic waveform interpretation with enhanced precision, flexibility, and usability. Here’s an overview of the key new features and what they mean for users: 1. Flow and Volume Signal Generation from Ventricular Pressure The new release introduces automated generation…
-
The comparison of clinical measurement methods is a fundamental component of medical research and diagnostic validation. This process is particularly relevant when introducing novel modalities or devices intended to assess the same physiological parameters as established techniques. Common examples include the measurement of cardiac output, ejection fraction, or ventricular volumes using thermodilution catheters, magnetic resonance…
-
We are excited to announce the launch of our free to use online single-beat analyzer, now available at www.hemodynamix.com. In this blog post, we will provide an overview of its features and demonstrate how it can be effectively utilized. When you open the analyzer page, the first step is to upload a suitable CSV or…
-
A pressure-volume loop is a graphical representation that illustrates the relationship between pressure and volume in the heart throughout a single cardiac cycle, providing valuable insights into the heart’s mechanical function and assisting in the diagnosis of various cardiac conditions. In a pressure-volume loop, the y-axis represents pressure (in mmHg), while the x-axis represents volume…
-
Echocardiography is a vital diagnostic tool in cardiology, employing high-frequency sound waves to create detailed images of the heart’s structure and function. This non-invasive procedure allows for real-time assessment of the heart without the need for radiation, making it safe for a wide range of patients. The process begins with the application of a gel…
