Calibration Conductance Catheter
Calibration Conductance Catheter - Related Videos
08:15
Cardiac Pressure-Volume Loop Analysis Using Conductance Catheters in Mice
0 Views •
Cited by 33 •
2015
Cardiac pressure-volume loop analysis is the most comprehensive way to measure cardiac function in the intact heart. We describe a technique to perform and analyze cardiac pressure volume loops, using conductance catheters.
07:43
Calibration Curves
0 Views •
2023
Source: Laboratory of Dr. B. Jill Venton - University of Virginia Calibration curves are used to understand the instrumental response to an analyte and predict the concentration in an unknown sample. Generally, a set of standard samples are made at various concentrations with a range than includes the unknown of interest and the instrumental response at each concentration is recorded. For more accuracy and to understand the error, the response at each concentration can be repeated so an error...
08:12
Pressure Transducer: Calibration Using a Pitot-static Tube
0 Views •
2023
Source: Shreyas Narsipur, Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC Fluid pressure is an important flow characteristic that is required to determine the aerodynamics of a system. One of the oldest and still existing pressure measurement systems is the manometer due to its accuracy and simplicity of operation. The manometer is generally a U-shaped glass tube that is partially filled with liquid, as shown in Figure 1. The U-tube manometer requires no...
01:11
Glassware Calibration
0 Views •
2024
Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes. Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
11:39
Peripheral Intravenous Catheter Insertion
0 Views •
2023
Source: Madeline Lassche, MSNEd, RN and Katie Baraki, MSN, RN, College of Nursing, University of Utah, UT The purpose of peripheral intravenous catheter (PIV) insertion is to infuse medications, perform intravenous (IV) fluid therapy, or inject radioactive tracers for special examination procedures. Placing a PIV is an invasive procedure and requires the use of an aseptic, no-touch technique. Common IV venipuncture sites are the arms and hands in adults and the feet in children. According to...
FAQs
Calibration corrects for parallel conductance from surrounding tissue and for differences in blood conductivity. Without these corrections, the electrical signal may not represent blood volume accurately within the cardiac chamber. Applying calibration therefore improves the relevance of the conductance-derived volume estimate and supports more reliable assessment of ventricular pressure-volume relationships in vivo.
The catheter electrodes apply a small electrical current through the blood and measure the resulting voltage. The measured conductance changes according to the amount of conductive blood within the chamber, allowing the signal to reflect volume changes over time. Tissue-related conductance and blood-conductivity differences must still be corrected during calibration.
Pressure-volume loops combine chamber pressure and calibrated volume information to show how the ventricle fills and contracts during cardiac activity. Their analysis helps researchers evaluate ventricular filling, contraction, stroke volume, and overall cardiac performance. Because the measurements are dynamic, the loops can also show how these functional features change during an experiment.
A typical workflow uses the catheter electrodes to introduce a small current and record voltage within the cardiac chamber. The conductance signal is then calibrated to account for surrounding-tissue conductance and blood-conductivity differences. Researchers use the corrected signal with pressure measurements to generate pressure-volume loops and analyze ventricular function during the experiment.
This approach is useful when investigators need dynamic, in vivo information about cardiac function rather than a single measurement. It can support studies examining normal hemodynamics, cardiovascular disease, drug effects, or other experimental interventions. The resulting pressure-volume analysis helps identify changes in filling, contraction, stroke volume, and overall cardiac performance.
By tracking pressure and calibrated volume during cardiac activity, the method provides functional measurements before, during, or after an experimental intervention. Researchers can examine whether disease, a drug, or another manipulation alters ventricular filling, contraction, stroke volume, or cardiac performance. This connects electrical measurements inside the chamber with broader changes in cardiovascular physiology.