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Related Concept Videos

Electrocardiogram01:29

Electrocardiogram

2.3K
An electrocardiogram (ECG or EKG) is a critical diagnostic tool that records the electrical signals produced by the heart during each heartbeat. This recording is achieved through electrodes placed strategically on the arms, legs, and chest. The electrocardiograph amplifies these signals and produces 12 distinct tracings, offering a comprehensive understanding of the heart's electrical activity.
Three major waveforms are present in a typical ECG recording: the P wave, the QRS complex, and...
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ECG Interpretation of Rhythms01:24

ECG Interpretation of Rhythms

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An electrocardiogram (ECG)graphically represents the heart's electrical activity on ECG paper or a monitor.
Components of the Electrocardiogram
The primary components of a normal ECG waveform in Normal sinus rhythm(NSR) include the P wave, PR interval, QRS complex, ST segment, T wave, and occasionally a U wave.
ECG waveforms are divided by vertical and horizontal lines at standard intervals.
The horizontal axis measures time and rate, and the vertical axis measures amplitude or voltage....
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Electrocardiogram Fundamentals01:28

Electrocardiogram Fundamentals

600
Introduction
An electrocardiogram (ECG) is a diagnostic tool for identifying cardiac conditions such as arrhythmias, conduction abnormalities, and myocardial ischemia.
Definition
An electrocardiogram (ECG) visualizes the heart's electrical activity by tracing the electrical movement associated with each heartbeat on a graph or monitor. As the heart beats, an electrical wave passes through it, correlating with the cardiac cycle events.
Parts of an ECG
An ECG utilizes electrodes on the skin...
600
ECG Interpretation of Arrhythmias I: Sinus Arrhythmias01:16

ECG Interpretation of Arrhythmias I: Sinus Arrhythmias

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Arrhythmias are disturbances in the heart's rhythm that lead to abnormal heartbeats. These irregularities can originate from different parts of the heart and are classified based on their origin and nature.
Types of Arrhythmias
Sinus Node Arrhythmias
Sinus Bradycardia: Originating from the sinoatrial (SA) node, sinus bradycardia involves slower impulses, resulting in a heart rate of less than 60 beats per minute (bpm). Causes include sleep, vagal stimulation, beta-blockers, hypothyroidism,...
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Exercise Stress Test01:26

Exercise Stress Test

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Introduction
Exercise stress testing, commonly known as a treadmill test, is a noninvasive procedure used to evaluate cardiovascular function and diagnose heart conditions.
Definition
An exercise stress test measures the heart's response to exertion using a treadmill or stationary bicycle. Chest electrodes record the heart's electrical activity through an ECG, and blood pressure is monitored regularly.
Purposes
222
Pulse rhythm01:30

Pulse rhythm

803
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...
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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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Validity of Computer-interpreted "Normal" and "Otherwise Normal" ECG in Emergency Department Triage Patients.

Ashley Deutsch1, Kye Poroksy1, Lauren Westafer1

  • 1University of Massachusetts Chan Medical School, Baystate Medical Center, Springfield, Massachusetts.

The Western Journal of Emergency Medicine
|January 11, 2024
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Computerized electrocardiogram (ECG) interpretations of "normal" or "otherwise normal" reliably rule out ST-elevation myocardial infarction (STEMI). These ECGs can await physician review, ensuring no delay in diagnosing acute STEMI in the emergency department.

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Area of Science:

  • Emergency Medicine
  • Cardiology
  • Medical Technology

Background:

  • Chest pain is a common emergency department (ED) chief complaint.
  • Immediate electrocardiogram (ECG) interpretation is recommended for suspected ST-elevation myocardial infarction (STEMI).
  • Computerized ECG interpretation may offer an alternative to immediate physician review.

Purpose of the Study:

  • To evaluate the reliability of computer-interpreted
  • normal
  • or
  • otherwise normal
  • ECGs in ruling out STEMI.
  • To determine if these computer interpretations can safely defer physician review.

Main Methods:

  • Prospective cohort analysis of 2,275 ECGs from an academic medical center's adult ED.
  • Comparison of computerized interpretations (GE MAC 5500, Marquette 12SL) with attending cardiologist interpretations.
  • Focus on ECGs with
  • normal
  • or
  • otherwise normal
  • computer readings.

Main Results:

  • Computerized interpretations of
  • normal
  • or
  • otherwise normal
  • ECGs demonstrated a 100% negative predictive value for STEMI.
  • No patients with these interpretations received a final diagnosis of STEMI, acute coronary syndrome, or other emergent cardiac conditions.

Conclusions:

  • Computerized ECG interpretation of
  • normal
  • or
  • otherwise normal
  • findings effectively excludes STEMI.
  • These ECGs can be safely deferred for physician interpretation without delaying critical STEMI diagnosis in the ED.