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Related Concept Videos

Open and closed-loop control systems01:17

Open and closed-loop control systems

Control systems are foundational elements in automation and engineering. They are broadly categorized into open-loop and closed-loop systems. These classifications hinge on the presence or absence of feedback mechanisms, significantly influencing the system's performance, complexity, and application.
An open-loop control system operates without feedback from the output. It consists of two primary elements: the controller and the controlled process. The controller receives an input signal and...
Heart Failure V: Medical Management01:30

Heart Failure V: Medical Management

Medical Management of Acute Decompensated Heart Failure (ADHF)The primary goals of therapy for patients hospitalized with acute decompensated heart failure (ADHF) include:Relieving symptomsOptimizing volume statusSupporting oxygenation and ventilationMaintaining cardiac output (CO) and end-organ perfusionIdentifying and addressing the cause of ADHFPreventing complicationsProviding patient education on factors precipitating HF exacerbationPlanning for dischargeOngoing monitoring and assessment...
Feedback control systems01:26

Feedback control systems

Feedback control systems are categorized in various ways based on their design, analysis, and signal types.
Linear feedback systems are theoretical models that simplify analysis and design. These systems operate under the principle that their output is directly proportional to their input within certain ranges. For instance, an amplifier in a control system behaves linearly as long as the input signal remains within a specific range. However, most physical systems exhibit inherent nonlinearity...
Autoregulation of Blood Flow01:17

Autoregulation of Blood Flow

Autoregulation mechanisms are characterized by their inherent capacity for self-regulation without necessitating specific nervous stimulation or endocrine control. These mechanisms facilitate the adjustment of blood flow and, therefore, perfusion specific to each tissue region. This self-regulation encompasses chemical signals and myogenic controls.
Chemical Signaling in Autoregulation
Chemical signaling operates at the precapillary sphincter level, inciting either contraction or relaxation.
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...
Heart Failure VI: Adjunct Therapies01:22

Heart Failure VI: Adjunct Therapies

Additional therapies for treating patients with heart failure (HF) may include procedural interventions, supplemental oxygen, the management of sleep disorders, and nutritional therapy.Procedural InterventionsImplantable Cardioverter-Defibrillator: For patients at risk of life-threatening arrhythmias due to severe left ventricular dysfunction, an Implantable Cardioverter-Defibrillator (ICD) can detect and terminate these arrhythmias, preventing sudden cardiac death and improving survival rates.

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Updated: May 13, 2026

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

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Published on: January 20, 2023

Decision support for hemodynamic management: from graphical displays to closed loop systems.

Frederic Michard1

  • 1From the Department of Critical Care, Edwards Lifesciences, Irvine, California.

Anesthesia and Analgesia
|March 2, 2013
PubMed
Summary

Current hemodynamic therapy delivery in anesthesia and critical care is suboptimal. Enhanced graphical displays and closed-loop systems may improve hemodynamic management and patient outcomes, but require further study.

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Published on: May 21, 2019

Area of Science:

  • Anesthesiology
  • Critical Care Medicine
  • Biomedical Engineering

Background:

  • Current hemodynamic therapy delivery in anesthesia and critical care is suboptimal.
  • Hemodynamic variables are often misunderstood and misused, leading to poor adoption of goal-directed strategies.
  • Existing decision support tools and closed-loop systems aim to improve therapy effectiveness.

Purpose of the Study:

  • To evaluate the potential of graphical displays and closed-loop systems in improving hemodynamic management.
  • To assess if enhanced visualization can lead to faster and more accurate clinical decisions.
  • To explore the feasibility of automating simple, repetitive tasks like intraoperative goal-directed fluid therapy.

Main Methods:

  • Review of current practices in hemodynamic therapy delivery.
  • Discussion of the potential benefits of graphical displays (metaphor and target screens).
  • Analysis of the role and limitations of closed-loop systems in critical care.

Main Results:

  • Graphical displays may enhance clinician understanding and integration of hemodynamic data.
  • Target screens show potential for improving adherence to goal-directed strategies.
  • Closed-loop systems offer promise for ensuring therapy delivery but face limitations with complex decisions.

Conclusions:

  • Hemodynamic therapy delivery requires improvement through better understanding and application of data.
  • Graphical displays and closed-loop systems present promising avenues for enhancing hemodynamic management.
  • Further prospective studies are needed to confirm the clinical utility and patient benefits of these technologies, particularly for automating tasks like fluid therapy.