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Related Concept Videos

Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

To obtain accurate blood pressure measurements in clinical settings, especially when traditional methods are insufficient, healthcare professionals utilize the Doppler ultrasound technique. This method uses high-frequency sound waves to detect blood flow within the arteries, which is crucial for patients with conditions that complicate circulatory system assessment.
Pre-Procedural Guidelines for Doppler Ultrasound Blood Pressure Assessment:
Preparation of Equipment:
Measurement of Blood Pressure01:17

Measurement of Blood Pressure

Assessing blood pressure is a standard procedure executed in virtually all medical environments. The method utilized today was established over a hundred years ago by an innovative Russian doctor, Dr. Nikolai Korotkoff. The soft ticking noise, known as Korotkoff sounds, heard while taking blood pressure readings results from turbulent blood flow within the vessels. The apparatus required for this procedure includes a sphygmomanometer, a blood pressure cuff attached to a gauge, and a stethoscope.
Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
Special considerations while measuring blood pressure01:28

Special considerations while measuring blood pressure

When assessing blood pressure (BP), healthcare professionals must consider various factors and potential unexpected outcomes to ensure accurate readings and provide proper patient care. Adhering to these guidelines is essential to achieving the most reliable results.
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.
Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

Direct Method
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...
Assessment of blood pressure in brachial artery(two-step method)01:23

Assessment of blood pressure in brachial artery(two-step method)

Measuring blood pressure is a fundamental skill in healthcare that aids in diagnosing and monitoring hypertension and other cardiovascular conditions. An aneroid sphygmomanometer, commonly used in clinical settings, offers a manual and precise method for blood pressure measurement. The technique for using this instrument involves specific steps that must be carefully executed to ensure accuracy. The following detailed description outlines a two-step technique for assessing blood pressure using...

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Updated: May 9, 2026

Continuous Venous-Arterial Doppler Ultrasound During a Preload Challenge
09:32

Continuous Venous-Arterial Doppler Ultrasound During a Preload Challenge

Published on: January 20, 2023

Hemodynamic pressure waveform analysis in predicting fluid responsiveness.

Sébastien Roy1, Pierre Couture, Baqir Qizilbash

  • 1Department of Anesthesiology, Montreal Heart Institute and Université de Montréal, Montreal, Quebec, Canada.

Journal of Cardiothoracic and Vascular Anesthesia
|July 16, 2013
PubMed
Summary
This summary is machine-generated.

The a/v wave ratio of pulmonary capillary wedge pressure (PCWP) effectively predicts fluid responsiveness in patients undergoing coronary artery bypass grafting. This waveform analysis offers a valuable tool for guiding fluid administration in this patient population.

Keywords:
a/c wavescardiac surgeryhemodynamic monitoringpreload responsivenesspulmonary artery pressures

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Published on: October 24, 2019

Area of Science:

  • Cardiovascular Physiology
  • Critical Care Medicine
  • Anesthesiology

Background:

  • Fluid responsiveness is crucial for optimizing hemodynamics in critically ill patients.
  • Traditional static measures like central venous pressure (CVP) and pulmonary capillary wedge pressure (PCWP) have limitations in predicting fluid responsiveness.
  • Dynamic indices are increasingly recognized for their predictive value.

Purpose of the Study:

  • To evaluate the utility of central venous pressure (CVP), diastolic right ventricular pressure, and pulmonary capillary wedge pressure (PCWP) waveform analysis in predicting fluid responsiveness.
  • To determine if specific waveform characteristics can reliably indicate an increase in stroke volume after fluid administration.

Main Methods:

  • A prospective observational study was conducted at a tertiary care university hospital.
  • Forty-four patients undergoing coronary artery bypass grafting were analyzed.
  • The a/v wave ratio of PCWP, CVP, and right ventricular dP/dt were assessed to predict a >15% increase in stroke volume after 500 mL of colloid infusion.

Main Results:

  • No significant differences in mean CVP or PCWP were observed between fluid responders and non-responders.
  • The a/v wave ratio of the PCWP tracing was the sole parameter significantly associated with fluid responsiveness (p = 0.0001).
  • Receiver operating characteristic curve analysis showed an area under the curve of 0.89 (95% CI, 0.79-0.99), indicating good predictive performance.

Conclusions:

  • The a/v ratio derived from the PCWP waveform is a reliable predictor of fluid responsiveness.
  • This finding is particularly relevant for patients with preserved left ventricular function undergoing coronary artery bypass grafting.
  • PCWP a/v ratio analysis offers a valuable, non-invasive method for guiding fluid management in this surgical cohort.