Pulmonary Vascular Impedance
Pulmonary Vascular Impedance - Related Videos
09:23
Shunt Surgery, Right Heart Catheterization, and Vascular Morphometry in a Rat Model for Flow-induced Pulmonary Arterial Hypertension
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Cited by 15 •
2017
This protocol describes a surgical procedure to create a model for flow-induced pulmonary arterial hypertension (PAH) in rats and the procedures to analyze the principle hemodynamic and histological end-points in this model.
08:59
Electrochemical Impedance Spectroscopy
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2023
Source: Kara Ingraham, Jared McCutchen, and Taylor D. Sparks, Department of Materials Science and Engineering, The University of Utah, Salt Lake City, UT Electrical resistance is the ability of an electrical circuit element to resist the flow of electricity. Resistance is defined by Ohm's Law: (Equation 1) Where is the voltage and is the current. Ohm's law is useful for determining the resistance of ideal resistors. However, many circuit elements are more complex and can't be described by...
06:59
Catheter-based Endovascular Angioplasty for Fibrosing Mediastinitis-associated Pulmonary Vein Stenosis
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2025
Pulmonary vein stenosis (PVS) is a life-threatening complication of fibrosing mediastinitis (FM), with a poor prognosis if not properly treated. Currently, catheter-based endovascular angioplasty is a promising therapeutic strategy for FM-associated PVS. This protocol primarily outlines a stepwise approach to the transcatheter procedure for FM-associated PVS.
09:22
Chronic Thromboembolic Pulmonary Hypertension and Assessment of Right Ventricular Function in the Piglet
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Cited by 22 •
2015
Chronic Thromboembolic Pulmonary Hypertension (CTEPH) and Right Ventricular (RV) dysfunction were induced in piglets by progressive obstruction of the pulmonary arteries. Consequences were remarkably similar to those observed in CTEPH patients. This animal model would be a very useful tool for pathophysiology and therapeutic experiments on CTEPH and RV failure.
08:55
In vivo Measurement of the Mouse Pulmonary Endothelial Surface Layer
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Cited by 17 •
2013
The endothelial glycocalyx/endothelial surface layer is ideally studied using intravital microscopy. Intravital microscopy is technically challenging in a moving organ such as the lung. We demonstrate how simultaneous brightfield and fluorescent microscopy may be used to estimate endothelial surface layer thickness in a freely-moving in vivo mouse lung.
FAQs
Pulmonary vascular resistance summarizes opposition to blood flow, whereas impedance also captures how the circulation responds to pulsatile flow. This broader analysis incorporates arterial compliance, characteristic vessel properties, and pressure-wave reflection. As a result, it can reveal changes in vascular stiffness or wave transmission that a resistance measurement alone may not identify.
Arterial compliance and characteristic vessel properties shape how pulmonary arteries accommodate and transmit pressure generated by the right ventricle. Reduced compliance or altered vessel characteristics can change the pressure-flow relationship across frequencies. Including these factors helps researchers distinguish whether an altered afterload reflects resistance, vessel stiffness, pulsatile transmission, or a combination of these effects.
Pressure-wave reflection contributes to the frequency-dependent pressure response observed in the pulmonary circulation. As blood moves from the right ventricle through the pulmonary arteries, reflected waves can modify pressure relative to flow. Assessing this behavior helps characterize wave transmission and identify vascular changes that may affect right ventricular workload beyond what steady-flow resistance indicates.
Researchers assess pulmonary vascular impedance by examining relationships between pulmonary artery pressure and blood flow across different frequencies. Comparing pressure and flow in this way describes how the pulmonary circulation responds to pulsatile activity rather than relying on a single resistance value. The resulting analysis can indicate changes in compliance, vessel properties, or wave reflection.
In pulmonary hypertension research, impedance analysis helps characterize changes in the pulmonary vascular system that may include altered resistance, reduced compliance, abnormal vessel properties, or modified wave transmission. Because it evaluates several contributors to right ventricular afterload, the approach can provide a more detailed basis for studying disease-related vascular changes and interpreting cardiovascular consequences.
Right ventricular–pulmonary artery coupling depends on how effectively the right ventricle generates flow against the load presented by the pulmonary circulation. Pulmonary vascular impedance adds information about pulsatile afterload, stiffness, and pressure-wave behavior, allowing researchers to examine this interaction more completely. It can therefore support cardiovascular research and assessment of treatment-related changes in vascular loading.