A Concise History of the ECG: Difference between revisions

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A Concise History of the ECG (view source)

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'''1932''' Charles Wolferth and Francis Wood describe the clinical use of chest leads. Wolferth CC, Wood FC. The electrocardiographic diagnosis of coronary occlusion by the use of chest leads. Am J Med Sci 1932;183:30-35  
'''1932''' Charles Wolferth and Francis Wood describe the clinical use of chest leads. Wolferth CC, Wood FC. The electrocardiographic diagnosis of coronary occlusion by the use of chest leads. Am J Med Sci 1932;183:30-35  


'''1934''' By joining the wires from the right arm, left arm and left foot with 5000 Ohm resistors Frank Wilson defines an 'indifferent electrode' later called the 'Wilson Central Terminal'. The combined lead acts as an earth and is attached to the negative terminal of the ECG. An electrode attached to the positive terminal then becomes 'unipolar' and can be placed anywhere on the body. Wilson defines the unipolar limb leads VR, VL and VF where 'V' stands for voltage (the voltage seen at the site of the unipolar electrode). Wilson NF, Johnston FE, Macleod AG, Barker PS. Electrocardiograms that represent the potential variations of a single electrode. Am Heart J. 1934;9:447-458.
'''1934''' By joining the wires from the right arm, left arm and left foot with 5000 Ohm resistors Frank Wilson defines an 'indifferent electrode' later called the 'Wilson Central Terminal'. The combined lead acts as an earth and is attached to the negative terminal of the ECG. An electrode attached to the positive terminal then becomes 'unipolar' and can be placed anywhere on the body. Wilson defines the unipolar limb leads VR, VL and VF where 'V' stands for voltage (the voltage seen at the site of the unipolar electrode). <cite>Wilson</cite>


'''1935''' McGinn and White describe the changes to the electrocardiogram during acute pulmonary embolism including the S1 Q3 T3 pattern. McGinn S, White PD. Acute cor pulmonale resulting from pulmonary embolism: its clinical recognition. JAMA 1935;114:1473.  
'''1935''' McGinn and White describe the changes to the electrocardiogram during acute pulmonary embolism including the S1 Q3 T3 pattern. McGinn S, White PD. Acute cor pulmonale resulting from pulmonary embolism: its clinical recognition. JAMA 1935;114:1473.  
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'''1955''' Richard Langendorf publishes the "rule of bigeminy" whereby ventricular bigeminy tends to perpetuate itself. Langendorf R, Pick A, Winternitz M. Mechanisms of intermittent ventricular bigeminy. I. Appearence of ectopic beats dependent upon the length of the ventricular cycle, the "rule of bigeminy." circulation 1955;11:442.  
'''1955''' Richard Langendorf publishes the "rule of bigeminy" whereby ventricular bigeminy tends to perpetuate itself. Langendorf R, Pick A, Winternitz M. Mechanisms of intermittent ventricular bigeminy. I. Appearence of ectopic beats dependent upon the length of the ventricular cycle, the "rule of bigeminy." circulation 1955;11:442.  


'''1956''' Paul Zoll, a cardiologist, uses a more powerful defibrillator and performs closed-chest defibrillation in a human. Zoll PM, Linenthal AJ, Gibson P: Termination of Ventricular Fibrillation in Man by Externally Applied Countershock . NEJM 1956; 254: 727-729
'''1956''' Paul Zoll, a cardiologist, uses a more powerful defibrillator and performs closed-chest defibrillation in a human. <cite>Zoll</cite>


'''1957''' Anton Jervell and Fred Lange-Nielsen of Oslo describe an autosomal recessive syndrome of long-QT interval, deafness and sudden death later known as the Jervell-Lange-Nielsen syndrome. Jervell A, Lange-Nielsen F. Congenital deaf mutism, functional heart disease with prolongation of the QT interval and sudden death. Am Heart J 1957;54:59.
'''1957''' Anton Jervell and Fred Lange-Nielsen of Oslo describe an autosomal recessive syndrome of long-QT interval, deafness and sudden death later known as the Jervell-Lange-Nielsen syndrome. <cite>Jervell</cite>


'''1958''' Professor Ake Senning, of Sweden, places the first implantable cardiac pacemaker designed by Rune Elmqvist into a 43-year-old patient with complete heart block and syncope (Arne Larsson).
'''1958''' Professor Ake Senning, of Sweden, places the first implantable cardiac pacemaker designed by Rune Elmqvist into a 43-year-old patient with complete heart block and syncope (Arne Larsson).
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'''1966''' Mason and Likar modify the 12-lead ECG system for use during exercise testing. The right arm electrode is placed at a point in the infraclavicular fossa medial to the border of the deltoid muscle, 2 cm below the lower border of the clavicle. The left arm electrode is placed similarly on the left side. The left leg electrode is placed at the left iliac crest. Although this system reduces the variability in the ECG recording during exercise it is not exactly equivalent to the standard lead positions. The Mason-Likar lead system tends to distort the ECG with a rightward QRS axis shift, a reduction in R wave amplitude in lead I and aVL, and a significant increase in R wave amplitude in leads II, III and aVF. Eur Heart J. 1987 Jul;8(7):725-33  
'''1966''' Mason and Likar modify the 12-lead ECG system for use during exercise testing. The right arm electrode is placed at a point in the infraclavicular fossa medial to the border of the deltoid muscle, 2 cm below the lower border of the clavicle. The left arm electrode is placed similarly on the left side. The left leg electrode is placed at the left iliac crest. Although this system reduces the variability in the ECG recording during exercise it is not exactly equivalent to the standard lead positions. The Mason-Likar lead system tends to distort the ECG with a rightward QRS axis shift, a reduction in R wave amplitude in lead I and aVL, and a significant increase in R wave amplitude in leads II, III and aVF. Eur Heart J. 1987 Jul;8(7):725-33  


'''1966''' François Dessertenne of Paris publishes the first case of '[[Torsade de pointes]]' Ventricular Tachycardia. Dessertenne F. La tachycardie ventriculaire a deux foyers opposes variables. Arch des Mal du Coeur 1966; 59:263
'''1966''' François Dessertenne of Paris publishes the first case of '[[Torsade de pointes]]' Ventricular Tachycardia. <cite>Dessertenne</cite>


'''1968''' Journal of Electrocardiography, the Official Journal of the International Society for Computerized Electrocardiology and the International Society of Electrocardiology, is founded by Zao and Lepeschkin.  
'''1968''' Journal of Electrocardiography, the Official Journal of the International Society for Computerized Electrocardiology and the International Society of Electrocardiology, is founded by Zao and Lepeschkin.  
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#Bancroft Bancroft, E. ''An essay on the natural history of Guiana'', London:T. Becket and P. A. de Hondt, 1769.
#Bancroft Bancroft, E. ''An essay on the natural history of Guiana'', London:T. Becket and P. A. de Hondt, 1769.
#Langendorf pmid=14352386
#Langendorf pmid=14352386
#Zoll pmid=13309666
#Dessertenne pmid=4956181
#Jervell pmid=13435203
#Wilson Wilson NF, Johnston FE, Macleod AG, Barker PS. ''Electrocardiograms that represent the potential variations of a single electrode.'' Am Heart J. 1934;9:447-458.
</biblio>
</biblio>
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