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Correlation means that there is a relationship between two or more variables (such as ice cream consumption and crime), but this relationship does not necessarily imply cause and effect. When two variables are correlated, it simply means that as one variable changes, so does the other. We can measure correlation by calculating a statistic known as a correlation coefficient. A correlation coefficient is a number from -1 to +1 that indicates the strength and direction of the relationship between...
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Dimensional analysis simplifies complex physical problems and guides experimental investigations, but it does not provide complete solutions. It identifies the dimensionless groups that influence a phenomenon, but experimental data is needed to establish the specific relationships and validate theoretical predictions.
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Syncope: Electrocardiographic and Clinical Correlation.

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  • 1Syncope Unit, Geriatrics and Intensive Care Unit, University of Florence, Azienda Ospedaliero Universitaria Careggi, Viale Pieraccini 6, Florence 50139, Italy.

Cardiac Electrophysiology Clinics
|May 23, 2018
PubMed
Summary
This summary is machine-generated.

Syncope, or fainting, is often caused by heart rhythm issues (arrhythmias). Cardiac syncope significantly raises the risk of death and cardiovascular events, necessitating accurate diagnosis.

Keywords:
ArrhythmiasElectrocardiogramSyncope

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Area of Science:

  • Cardiology
  • Neurology

Background:

  • Syncope is a common condition resulting from temporary reduced blood flow to the brain.
  • Cardiac syncope is associated with a significantly increased risk of mortality and adverse cardiovascular outcomes.
  • Arrhythmias, including bradyarrhythmias and tachyarrhythmias, are primary cardiac causes of syncope.

Purpose of the Study:

  • To summarize the causes and diagnostic approaches for syncope, with a focus on cardiac etiologies.
  • To highlight the prognostic implications of cardiac syncope.

Main Methods:

  • Review of clinical history and physical examination findings.
  • Utilization of active standing tests and 12-lead electrocardiograms for initial evaluation.
  • Assessment of the diagnostic utility of electrophysiological studies based on pretest probability.

Main Results:

  • Cardiac syncope is linked to a doubled risk of all-cause mortality.
  • Cardiac syncope increases the risk of both fatal and nonfatal cardiovascular events.
  • The effectiveness of electrophysiological studies is contingent upon the initial likelihood of the condition.

Conclusions:

  • Arrhythmias represent the most frequent cardiac cause of syncope.
  • Comprehensive initial evaluation is crucial for syncope management.
  • Electrophysiological study plays a role in diagnosis, guided by pretest probability.