library contents | ECG axis | ECG history | ECGs by Example

An electrocardiogram (ECG / EKG) is an electrical recording of the heart and is used in the investigation of heart disease. This library is a collection of realistic looking recordings which will help improve your ECG skills. Information about the library and the techniques used to reproduce the recordings is available. There are also details of our book ECGs by Example.


The normal electrocardiogram.

ischaemic heart disease

Acute inferior myocardial infarction
Acute anterior myocardial infarction
Acute posterior myocardial infarction
Old inferior myocardial infarction
Acute myocardial infarction in the presence of LBBB

hypertrophy patterns

Left ventricular and left atrial hypertrophy - aortic stenosis
Mitral Stenosis
Right atrial hypertrophy
Left ventricular hypertrophy in the presence of left anterior hemiblock

atrioventricular (AV) block

First degree AV block
2 to 1 Atrioventricular block
Complete Heart Block
Complete heart block and atrial fibrillation

bundle branch block

Right Bundle Branch Block
Left anterior hemiblock
Left bundle branch block
'Trifascicular' block

supraventricular rhythms

Sinus bradycardia
Sinus tachycardia
Atrial Bigeminy
Atrial Premature Beat
Atrial fibrillation with rapid ventricular response
Atrial fibrillation with pre-existing LBBB
Atrial Flutter
Atrial flutter with 2:1 AV conduction
Wolff-Parkinson-White syndrome with atrial fibrillation

ventricular rhythms

Ventricular premature beats
Ventricular bigeminy
Idioventricular escape rhythm in Complete Heart Block
Ventricular tachycardia with clear AV dissociation
Ventricular tachycardia with subtle AV dissociation
Torsade de pointes ventricular tachycardia
Polymorphic Ventricular Tachycardia with an ICD
Ventricular Fibrillation


Ventricular pacemaker
Dual Chamber Pacemaker with an ICD

Wolff Parkinson White syndrome

WPW syndrome - left lateral pathway
WPW syndrome - anteroseptal pathway
Wolff-Parkinson-White syndrome with atrial fibrillation
Wolff-Parkinson-White syndrome with atrial fibrillation (another example)


Implantable Cardioverter Defibrillator
Electrical Alternans - pericardial effusion
Long QT interval Romano-Ward Syndrome
Lown-Ganong-Levine Syndrome
Acute pulmonary embolus
Piggy-back heart transplant
Digitalis effect


The electrical axis at a glance.
A brief history of electrocardiography
A page of comments and corrections for our book 'ECGs by Example'.

[ECG library contents] [About the library and its librarians] [History of ECGs] [FAQ]

   created:  10th July 1996
   updated:  18th Oct 2014
   authors:  Dean Jenkins, Consultant Physician, UK
             Stephen Gerred, Consultant Physician, Auckland, New Zealand
             comments always welcome

© Copyright 1995-2014. Dean Jenkins and Stephen Gerred.
The ECGs and associated images on these webpages may be used for any non-commercial purpose as long as their source is acknowledged.

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