Related Experiment Video
Updated: Jul 28, 2026
Semi-Minimal Invasive Method to Induce Myocardial Infarction in Rats and the Assessment of Cardiac Function by an Isolated Working Heart System
Published on: June 11, 2020
Application of noninvasive techniques for measuring cardiac output in hypertensive patients
1Department of Medicine, University of Pennsylvania School of Medicine.
Insights
Noninvasive methods now allow accurate cardiac output measurement, crucial for understanding hypertension. This advances diagnosis, prognosis, and treatment of high blood pressure by revealing systemic vascular resistance.
Area of Science:
- Cardiovascular Medicine
- Hypertension Research
- Hemodynamics
Background:
- Hypertension is characterized by increased systemic vascular resistance.
- Measuring systemic vascular resistance typically requires invasive cardiac output assessment.
- This limits routine hemodynamic evaluation in hypertensive patients.
Purpose of the Study:
- To highlight the availability and utility of noninvasive cardiac output measurement techniques.
- To emphasize the potential of these methods for understanding hypertension.
- To improve diagnostic and prognostic accuracy in hypertensive individuals.
Main Methods:
- Echocardiography
- Doppler echocardiography
- CO2 rebreathing
- Impedance cardiography
Main Results:
- Reliable, totally noninvasive methods for cardiac output measurement are now available.
- These techniques provide accurate measurements across various conditions (rest, exercise, pharmacologic interventions).
Conclusions:
- Serial application of noninvasive methods can expand understanding of hemodynamic alterations in hypertension.
- Improved hemodynamic knowledge can enhance diagnostic/prognostic accuracy and elucidate hypertension pathophysiology.
- This facilitates a better understanding of antihypertensive intervention mechanisms.
Abstract:
The hemodynamic hallmark of hypertension is increased systemic vascular resistance, although this variable is usually not determined in hypertensive patients because it has generally required invasive procedures to measure cardiac output. Reliable, totally noninvasive methods are now available that measure cardiac output accurately enough under a variety of conditions, including rest, exercise, and pharmacologic interventions. These methods include echocardiography, Doppler echocardiography, CO2 rebreathing, and impedance cardiography. Their serial application to large numbers of patients offers the opportunity to significantly broaden our understanding of the spectrum and course of hemodynamic alterations associated with hypertension. A more complete knowledge of underlying hemodynamics could improve our diagnostic and prognostic accuracy in hypertensive patients and enhance our understanding of the pathophysiology of hypertension and the mechanism of action of antihypertensive interventions.
Related Concept Videos
01:21Sites for measuring blood pressure
The Brachial Artery: Primary Site for Blood Pressure Measurement
01:30Equipments Used To Measure Blood Pressure
This invasive approach involves cannulating a peripheral artery. During each cardiac contraction, pressure generates mechanical motion within the catheter, transmitted through rigid, fluid-filled tubing to a transducer. This transducer converts mechanical motion into electrical signals displayed as waveforms on a monitor. An automatic flushing system prevents blood backflow. Due to the potential risk of unexpected arterial blood loss, this method is primarily used in intensive...
01:23Assessment of blood pressure in brachial artery(two-step method)
01:19Assessing Blood pressure using a doppler ultrasound
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
01:28Special considerations while measuring blood pressure
Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.
01:17Measurement of Blood Pressure