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Related Concept Videos

Pulse rhythm01:30

Pulse rhythm

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 muscle...
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.
Cardiopulmonary Resuscitation IV: Pharmacological Management01:25

Cardiopulmonary Resuscitation IV: Pharmacological Management

Pharmacologic intervention is crucial in treating cardiac arrest patients during ACLS or Advanced Cardiovascular Life Support. The ACLS algorithms guide the administration of specific drugs based on the patient's cardiac arrest rhythm, which includes pulseless ventricular tachycardia (VT), ventricular fibrillation (VF), asystole, and pulseless electrical activity (PEA).EpinephrineIndication: Epinephrine is the first-line drug for all cardiac arrest rhythms.Mechanism of Action: Epinephrine...

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Related Experiment Video

Updated: May 22, 2026

Use of a Percutaneous Ventricular Assist Device/Left Atrium to Femoral Artery Bypass System for Cardiogenic Shock
07:39

Use of a Percutaneous Ventricular Assist Device/Left Atrium to Femoral Artery Bypass System for Cardiogenic Shock

Published on: August 16, 2021

A pulsatile control algorithm of continuous-flow pump for heart recovery.

Bin Gao1, Yu Chang, Kaiyun Gu

  • 1School of Life Science and BioEngineering, Beijing University of Technology, PR China.

ASAIO Journal (American Society for Artificial Internal Organs : 1992)
|May 12, 2012
PubMed
Summary

A new pulsatile control strategy (PCS) for intra-aorta pumps enhances circulatory support by restoring pulsatile blood flow and pressure. This advanced method improves left ventricular (LV) unloading and adapts to patient needs, demonstrating feasibility in simulations and experiments.

Related Experiment Videos

Last Updated: May 22, 2026

Use of a Percutaneous Ventricular Assist Device/Left Atrium to Femoral Artery Bypass System for Cardiogenic Shock
07:39

Use of a Percutaneous Ventricular Assist Device/Left Atrium to Femoral Artery Bypass System for Cardiogenic Shock

Published on: August 16, 2021

Area of Science:

  • Biomedical Engineering
  • Cardiovascular Devices
  • Control Systems

Background:

  • Continuous flow (CF) left ventricular (LV) assist devices have limitations in providing optimal LV unloading and circulatory support.
  • Pulsatile flow LV devices have demonstrated superior hemodynamic benefits compared to CF devices.
  • The intra-aorta pump presents a novel platform for circulatory support.

Purpose of the Study:

  • To design and verify a pulsatile control algorithm for an intra-aorta pump.
  • To evaluate the algorithm's ability to restore pulsatile arterial pressure (AP) and blood flow.
  • To assess the controller's responsiveness to changing patient circulatory conditions and its capacity for LV unloading.

Main Methods:

  • Development of a pulsatile control strategy (PCS) for the intra-aorta pump.
  • Mathematical modeling of the cardiovascular-pump system to simulate LV failure and assess control feasibility.
  • In vitro experimental validation of the intra-aorta pump's dynamic performance under PCS control.

Main Results:

  • The PCS significantly increased surplus hemodynamic energy (SHE) and maintained pulsatility (PR, PAI) compared to a failing heart without support.
  • Simulations demonstrated effective LV unloading and automatic regulation of pump output in response to simulated changes in peripheral resistance and ventricular contractility.
  • In vitro experiments confirmed the intra-aorta pump's ability to achieve pulsatile pump speeds dictated by the PCS.

Conclusions:

  • The proposed pulsatile control strategy is feasible for the intra-aorta pump, effectively restoring pulsatility of AP and blood flow.
  • The PCS provides substantial LV unloading and ensures adequate patient perfusion by dynamically responding to changing circulatory demands.
  • This control strategy represents a significant advancement in LV assist device technology, offering improved hemodynamic support.