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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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.
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Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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Cardiopulmonary Resuscitation I: Adult01:21

Cardiopulmonary Resuscitation I: Adult

Cardiopulmonary resuscitation, or CPR, is a life-saving emergency procedure performed when a person's heart has stopped beating or they are no longer breathing. The foundation of CPR is Basic Life Support (BLS), which focuses on the early recognition of cardiac arrest, the immediate start of high-quality chest compressions, and the timely use of an automated external defibrillator (AED).Assessing Responsiveness and Checking the Carotid PulseWhen approaching an unresponsive person, first ensure...
Cardiopulmonary Resuscitation III: AED Use01:23

Cardiopulmonary Resuscitation III: AED Use

Introduction to AEDAn Automated External Defibrillator (AED) is a portable medical device that analyzes the heart's rhythm and, if necessary, delivers an electrical shock to help the heart re-establish an effective rhythm during sudden cardiac arrest (SCA). SCA occurs when the heart suddenly and unexpectedly stops beating, leading to a loss of blood flow to the brain and other vital organs. In such emergencies, time is of the essence, and using an AED, combined with Cardiopulmonary...
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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: Jul 6, 2026

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

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Published on: September 26, 2016

Novel CPR with periodic Gz acceleration.

J A Adams1, M J Mangino, J Bassuk

  • 1Department of Research, Division of Neonatology, Mount Sinai Medical Center, and Miami Heart Research Institute, 4300 Alton Road, 3 Blum, Miami Beach, FL 33140, USA. tony@msmc.com

Resuscitation
|November 24, 2001
PubMed
Summary

Periodic Gz acceleration cardiopulmonary resuscitation (pGz-CPR) in pigs improved cardiac output and capillary blood flow during fibrillation. This method facilitated successful resuscitation and sustained blood pressure post-procedure without external support.

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Standardized Model of Ventricular Fibrillation and Advanced Cardiac Life Support in Swine
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Standardized Model of Ventricular Fibrillation and Advanced Cardiac Life Support in Swine

Published on: January 30, 2020

Area of Science:

  • Cardiovascular Physiology
  • Emergency Medicine
  • Biomedical Engineering

Background:

  • Acute cardiopulmonary resuscitation (CPR) efficacy remains a critical challenge in emergency medicine.
  • Optimizing hemodynamic support during cardiac arrest is essential for patient survival and recovery.
  • Periodic Gz acceleration (pGz) is a novel mechanical force with potential applications in resuscitation.

Purpose of the Study:

  • To evaluate the effects of pGz on cardiovascular function and hemodynamics in a pig model of acute CPR.
  • To determine the impact of pGz-CPR on cardiac output, blood flow distribution, and resuscitation success.
  • To assess the feasibility of pGz-CPR in achieving return of spontaneous circulation (ROSC) and sustained hemodynamic stability.

Main Methods:

  • pGz (horizontal head-to-foot oscillations at 2 Hz) was applied to pigs experiencing induced cardiac fibrillation.
  • Cardiac output was measured during pGz-CPR, with varying acceleration amplitudes.
  • Capillary blood flow was assessed using colored microspheres, and resuscitation outcomes were monitored.
  • Control animals received standard care without pGz-CPR.

Main Results:

  • pGz-CPR increased cardiac output in fibrillating animals, reaching 20% of pre-fibrillation values at 0.7 G.
  • Capillary perfusion was restored in all tissue beds, with significant increases in endocardial and brain stem flow.
  • Animals undergoing pGz-CPR for 15 minutes achieved successful resuscitation with sustained blood pressure for 2 hours post-ROSC.
  • Control animals without pGz-CPR showed significantly lower survival rates.

Conclusions:

  • Experimental pGz-CPR effectively enhances cardiac output and capillary blood flow during cardiac fibrillation.
  • pGz-CPR provides sufficient hemodynamic support to maintain vital organ perfusion and facilitate successful resuscitation.
  • This technique shows promise for improving outcomes in CPR by supporting circulation and enabling sustained recovery without pharmacological intervention.