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The value of intracardiac electrography.

Krikler, Dennis M.
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About this work


Dr Dennis Kirkler discusses intracardiac electrography. He gives a brief history of the technique, showing early apparatus and tracings, but the majority of his lecture consists of him demonstrating, and illustrating, the method as a diagnostic tool, differentiating its capabilities from those of the standard ECG, particularly in the diagnosis of some of the rarer causes of disturbance of the heart rhythm. The lecture is primarily technical in presentation.


London : University of London Audio-Visual Centre, 1974.

Physical description

1 encoded moving image.




Copyright note

University of London

Terms of use

Creative Commons Attribution-Non-Commercial 2.0 UK: England & Wales

Language note

In English

Creator/production credits

Presented by Dr Dennis Krikler, Consultant Cardiologist, Royal Postgraduate Medical School. Produced by Trevor A Scott. Made for British Postgraduate Medical Federation. Made by University of London Audio-Visual Centre.


This video is one of around 310 titles, originally broadcast on Channel 7 of the ILEA closed-circuit television network, given to Wellcome Trust from the University of London Audio-Visual Centre shortly after it closed in the late 1980s. Although some of these programmes might now seem rather out-dated, they probably represent the largest and most diversified body of medical video produced in any British university at this time, and give a comprehensive and fascinating view of the state of medical and surgical research and practice in the 1970s and 1980s, thus constituting a contemporary medical-historical archive of great interest. The lectures mostly take place in a small and intimate studio setting and are often face-to-face. The lecturers use a wide variety of resources to illustrate their points, including film clips, slides, graphs, animated diagrams, charts and tables as well as 3-dimensional models and display boards with movable pieces. Some of the lecturers are telegenic while some are clearly less comfortable about being recorded; all are experts in their field and show great enthusiasm to share both the latest research and the historical context of their specialist areas.


Segment 1 Kirkler introduces the subject and shows photographs and tracings from early ECG apparatus. He then demonstrates how ECG tracings are unable to give detailed information about various important aspects of the major intervals, particularly the P-R interval. Kirkler shows how this is better seen on an intracardiac electrogram, he explains it in detail. Time start: 00:00:00:00 Time end: 00:05:38:14 Length: 00:05:38:14
Segment 2 Using diagrams and photographs to illustrate his points, Kirkler shows how intracardiac electrography is performed. We see the apparatus used in a hospital theatre and Kirkler presents and explains the findings in a series of diagrams. Time start: 00:05:38:14 Time end: 00:09:38:10 Length: 00:03:59:21
Segment 3 Kirkler continues to demonstrate the functions of intracardiac electrography. He shows, in particular, tracings from the His bundle and explains what aspects of heart activity they relate to. Time start: 00:09:38:10 Time end: 00:15:00:00 Length: 00:05:22:15
Segment 4 Kirkler focuses on congenital complete heart block, showing tracings of this on an intracardiac recording from the His bundle electrogram. He compares the details of this tracing with tracings of other forms of heart block. Kirkler then turns to focus on rhythm disorders, demonstrating through tracings how intracardiac electrography can refine the process of accurate diagnosis. Time start: 00:15:00:00 Time end: 00:21:00:15 Length: 00:06:00:15
Segment 5 Kirkler analyses traces of arrhythmia, in particular Wolff-Parkinson-White syndrome - he shows, in detail, how a bundle of His electrogram reveals the signs of this condition. Time start: 00:21:00:15 Time end: 00:25:26:00 Length: 00:04:25:10
Segment 6 Kirkler continues to demonstrate and illustrate ways in which intracardiac electrography is useful. He focuses on two conditions which would be hard to diagnose without the technique: paroxysmal sinus tachycardia and sinoatrial block, he analyses tracings from both of these conditions. Time start: 00:25:26:00 Time end: 00:33:01:20 Length: 00:07:36:20


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