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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

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Pulse rhythm refers to the pattern of pulsations within specific intervals, offering valuable insights into the regularity or irregularity of the heart's beats as observed through the pattern of pulsation within specific intervals. A regular pulse exhibits a consistent heart rate with uniform waveforms and pulsation force, variations of which can be classified as normal, weak, or bounding.
Conversely, an irregular pulse pattern is termed dysrhythmia, stemming from disruptions in cardiac...
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Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

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Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac...
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
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Assessing Blood pressure using a doppler ultrasound01:19

Assessing Blood pressure using a doppler ultrasound

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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:
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Equipments Used To Measure Blood Pressure01:30

Equipments Used To Measure Blood Pressure

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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...
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Related Experiment Video

Updated: Sep 18, 2025

Author Spotlight: Assessment of Cardiac Output Calculation by Thermodilution in Pigs for Effective Perfusion Flow During EVLP
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Author Spotlight: Assessment of Cardiac Output Calculation by Thermodilution in Pigs for Effective Perfusion Flow During EVLP

Published on: June 28, 2024

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Fourth Generation FloTrac Software Pulse Contour Analysis for Measuring and Trending Cardiac Output: A Method

Caroline Dinesen1,2, Simon Tilma Vistisen2, Rasmus Aagaard1,2,3

  • 1Department of Cardiothoracic and Vascular Surgery, Anesthesia Section, Aarhus University Hospital, Aarhus, Denmark.

Acta Anaesthesiologica Scandinavica
|June 25, 2025
PubMed
Summary
This summary is machine-generated.

The FloTrac method, a minimally invasive cardiac output monitor, is not interchangeable with the thermodilution method in post-cardiac surgery patients due to unacceptable percentage errors and limited trending ability.

Keywords:
FloTraccardiac outputfluid responsivenessminimal invasive

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Quantification of Global Diastolic Function by Kinematic Modeling-based Analysis of Transmitral Flow via the Parametrized Diastolic Filling Formalism
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Quantification of Global Diastolic Function by Kinematic Modeling-based Analysis of Transmitral Flow via the Parametrized Diastolic Filling Formalism
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Area of Science:

  • Cardiovascular physiology
  • Medical device evaluation
  • Hemodynamic monitoring

Background:

  • Accurate cardiac output (CO) assessment is vital for hemodynamic management.
  • The FloTrac system offers minimally invasive, continuous CO estimation.
  • This study compared the FloTrac method to pulmonary artery catheter thermodilution.

Purpose of the Study:

  • To evaluate the accuracy, precision, and trending performance of the FloTrac method.
  • To compare FloTrac CO measurements against thermodilution (TD) CO measurements.
  • To determine the interchangeability of FloTrac with TD in cardiac surgery patients.

Main Methods:

  • Prospective interventional study of 41 cardiac surgery patients.
  • Simultaneous CO measurements using FloTrac and TD before/after preload interventions.
  • Analysis of bias, limits of agreement, percentage error (PE), and concordance rates.

Main Results:

  • Bias ranged from -0.36 to 0.79 L/min; limits of agreement were wide.
  • Percentage errors (PE) exceeded the 30% threshold (35-42%).
  • Concordance rates were below the 90% criterion (72-85%).

Conclusions:

  • The FloTrac method did not meet interchangeability criteria with thermodilution.
  • Unacceptable percentage errors and poor trending limit FloTrac's clinical utility.
  • FloTrac's accuracy and precision are insufficient for this patient population.