Correlations between first documented cardiac rhythms and preceding telemetry in patients with code blue events

Area of Science:

• Cardiology
• Critical Care Medicine
• Clinical Research

Background:

• The first documented rhythm (FDR) in in-hospital cardiac arrest (IHCA) is often used to infer arrest etiology.
• However, the FDR may not accurately represent the rhythm at the onset of cardiac arrest, potentially reflecting a later stage of the event.
• This study investigated whether an earlier rhythm, captured by telemetry at the time of the code blue call, differs from the FDR.

Purpose of the Study:

• To evaluate the agreement between the first documented rhythm (FDR) and the telemetry rhythm recorded at the time of a code blue call in adult patients experiencing IHCA.
• To determine if telemetry rhythm provides a more accurate reflection of the cardiac rhythm at the time of arrest compared to the FDR.

Main Methods:

• A cross-sectional study was conducted in two hospitals (a tertiary care and a community hospital).
• Adult patients on telemetry monitoring who experienced an IHCA were included.
• The telemetry rhythm recorded within the two minutes prior to the code blue call was compared with the FDR documented during resuscitation.

Main Results:

• Agreement between the FDR and telemetry rhythm was found to be only fair (65%, kappa = 0.37) among 69 IHCA events.
• In cases where the FDR was ventricular tachyarrhythmia (VTA), telemetry showed VTA in 71% of events but other organized rhythms in 29%.
• When the FDR was asystole, telemetry revealed asystole in only 25% of cases, with other organized rhythms present in 67%.

Conclusions:

• The first documented rhythm (FDR) has limited agreement with the telemetry rhythm at the time of code blue calls in IHCA patients.
• Telemetry rhythm data, captured earlier in the event, may serve as a valuable supplement to the FDR for investigating the etiology of in-hospital cardiac arrest.
• Utilizing telemetry data could improve the accuracy of determining arrest causes and guide subsequent treatment strategies.