What is the clinical evidence from this study?

Study design: Observational. Population: Out-of-hospital cardiac arrest (n=90). Intervention: Amplitude spectrum area (AMSA) vs. Unsuccessful defibrillation. Primary outcome: Successful defibrillation (restoration of a perfusing rhythm) (Sensitivity 0.91, Specificity 0.97, p=< 0.0001).

What question did this study set out to answer?

To evaluate the efficacy of the electrocardiographic amplitude spectrum area (AMSA) parameter in predicting whether an electrical shock will successfully restore a perfusing rhythm during cardiopulmonary resuscitation.

January 1, 2008Anaesthesia and Intensive CareOpen Access

Prediction of Successful Defibrillation in Human Victims of Out-of-Hospital cArdiac Arrest: A Retrospective Electrocardiographic Analysis

Q: What are the key findings of this study?

An amplitude spectrum area (AMSA) threshold of 12 mV-Hz predicted successful defibrillation in out-of-hospital cardiac arrest with a sensitivity of 0.91 and a specificity of 0.97 (P<0.0001).

Q: What question did this study set out to answer?

To evaluate the efficacy of the electrocardiographic amplitude spectrum area (AMSA) parameter in predicting whether an electrical shock will successfully restore a perfusing rhythm during cardiopulmonary resuscitation.

View Full Paper

Ask AI

Bookmark

Key result

An amplitude spectrum area (AMSA) threshold of 12 mV-Hz predicted successful defibrillation in out-of-hospital cardiac arrest with a sensitivity of 0.91 and a specificity of 0.97 (P<0.0001).

Why the study?

Does amplitude spectrum area (AMSA) analysis predict successful defibrillation in victims of out-of-hospital cardiac arrest?

Population

90 human victims of out-of-hospital cardiac arrest (representing 210 defibrillation attempts)

Design

Cohort

Authors

GRGiuseppe Ristagno AGA. Gullo GBGiorgio Berlot

Discussion

Member takes

Overview

May guide defibrillation timing in out-of-hospital cardiac arrest; hypothesis-generating and requires randomized validation.

Key Points

To evaluate the efficacy of the electrocardiographic amplitude spectrum area (AMSA) parameter in predicting whether an electrical shock will successfully restore a perfusing rhythm during cardiopulmonary resuscitation.
Retrospective electrocardiographic analysis of lead 2 equivalent automated external defibrillator recordings across 210 defibrillation attempts from 90 victims of out-of-hospital cardiac arrest.
Calculated AMSA—the magnitude of the weighted frequency spectrum between 2 and 48 Hz—from a 4.1-second interval of ventricular fibrillation or ventricular tachycardia immediately preceding shock delivery.
AMSA values were significantly higher immediately before successful defibrillations that restored a perfusing rhythm compared to unsuccessful attempts (P < 0.0001).
An AMSA cutoff threshold of 12 mV-Hz predicted the success of individual defibrillation attempts with a sensitivity of 0.91 and a specificity of 0.97.

Study Design

Type

Observational (n=90)

Structured PICO

Does amplitude spectrum area (AMSA) analysis predict successful defibrillation in victims of out-of-hospital cardiac arrest?

Population

90 victims of out-of-hospital cardiac arrest with 210 defibrillation attempts analyzed retrospectively.

Exposure

Amplitude spectrum area (AMSA) analysis of a 4.1 second interval of ventricular fibrillation or ventricular tachycardia recorded immediately preceding shock delivery

Outcome

Successful defibrillation (restoration of a perfusing rhythm)surrogate

Main Result

Effect estimate: Sensitivity 0.91, Specificity 0.97

p-value: p=< 0.0001

AMSA analysis provides a highly sensitive and specific real-time prediction of defibrillation success in out-of-hospital cardiac arrest, which could help minimize futile shocks and reduce post-resuscitation myocardial injury.

Cite This Study

Ristagno et al. (2008) conducted an observational in Out-of-hospital cardiac arrest (n=90). Amplitude spectrum area (AMSA) vs. Unsuccessful defibrillation was evaluated on Successful defibrillation (restoration of a perfusing rhythm) (Sensitivity 0.91, Specificity 0.97, p=< 0.0001). An amplitude spectrum area (AMSA) threshold of 12 mV-Hz predicted successful defibrillation in out-of-hospital cardiac arrest with a sensitivity of 0.91 and a specificity of 0.97 (P<0.0001).

synapsesocial.com/papers/6a9d975e91d47537a28b083b https://doi.org/10.1177/0310057x0803600108

View Full Paper

Ask AI

Bookmark

January 1, 2008Anaesthesia and Intensive CareOpen Access

Prediction of Successful Defibrillation in Human Victims of Out-of-Hospital cArdiac Arrest: A Retrospective Electrocardiographic Analysis

View Full Paper

Ask AI

Bookmark

Key result

An amplitude spectrum area (AMSA) threshold of 12 mV-Hz predicted successful defibrillation in out-of-hospital cardiac arrest with a sensitivity of 0.91 and a specificity of 0.97 (P<0.0001).

Why the study?

Does amplitude spectrum area (AMSA) analysis predict successful defibrillation in victims of out-of-hospital cardiac arrest?

Population

90 human victims of out-of-hospital cardiac arrest (representing 210 defibrillation attempts)

Design

Cohort

Authors

GRGiuseppe Ristagno AGA. Gullo GBGiorgio Berlot

Discussion

Member takes

Overview

May guide defibrillation timing in out-of-hospital cardiac arrest; hypothesis-generating and requires randomized validation.

Key Points

To evaluate the efficacy of the electrocardiographic amplitude spectrum area (AMSA) parameter in predicting whether an electrical shock will successfully restore a perfusing rhythm during cardiopulmonary resuscitation.
Retrospective electrocardiographic analysis of lead 2 equivalent automated external defibrillator recordings across 210 defibrillation attempts from 90 victims of out-of-hospital cardiac arrest.
Calculated AMSA—the magnitude of the weighted frequency spectrum between 2 and 48 Hz—from a 4.1-second interval of ventricular fibrillation or ventricular tachycardia immediately preceding shock delivery.
AMSA values were significantly higher immediately before successful defibrillations that restored a perfusing rhythm compared to unsuccessful attempts (P < 0.0001).
An AMSA cutoff threshold of 12 mV-Hz predicted the success of individual defibrillation attempts with a sensitivity of 0.91 and a specificity of 0.97.

Study Design

Type

Observational (n=90)

Structured PICO

Does amplitude spectrum area (AMSA) analysis predict successful defibrillation in victims of out-of-hospital cardiac arrest?

Population

90 victims of out-of-hospital cardiac arrest with 210 defibrillation attempts analyzed retrospectively.

Exposure

Amplitude spectrum area (AMSA) analysis of a 4.1 second interval of ventricular fibrillation or ventricular tachycardia recorded immediately preceding shock delivery

Outcome

Successful defibrillation (restoration of a perfusing rhythm)surrogate

Main Result

Effect estimate: Sensitivity 0.91, Specificity 0.97

p-value: p=< 0.0001

Cite This Study

synapsesocial.com/papers/6a9d975e91d47537a28b083b https://doi.org/10.1177/0310057x0803600108

Also Consider

Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context:

View Full Paper

Ask AI

Bookmark