Ambulatory electrocardiogram (AECG) is an integral part of the diagnostic system of modern clinical practice.
AECG origins are in the late 30-ies of the last century and are associated with the name of a talented experimental scientist N. Holter. He not only expressed, but also embodied the idea of waking registration of biological signals in the body naturally.
N. Holter with JA Gengerelli first realized the stimulation and recording of electrical activity in rat brain at a distance from the transmission and reception of signals through electrodes implanted on the radio.
N. Holter, along with physicist W. Glasscock created the first electrocardiograph with a radio transmitter to broadcast the electrical signals from the heart to a distance of a city block. Dimensions (only weight 38.5 kg) were not allowed to use the ECG in practice, so they were soon reduced, but with the possibility of translating the electrocardiographic signal at a distance of several meters. With a further reduction of its size and the addition of decoding Records received the first full AECG.
The official date of birth AECG schitayut1961, when the journal Science published an article by N. Holter «A new method for the study of the heart. The practical use of long-term electrocardiogram in patients during the activity. The first commercial AECG appeared the following year.
It took, however, almost 40 years to summarize the results of clinical application of AECG as published in the 1999 American College of Cardiology and the American Heart Association guidelines.
In this age of AECG is undergoing a revolutionary change in the instrument parts, ways and means of telemetry transmission of ECG signals, options for the number of registered channels, quality and duration of their registration, software products, with the possibilities of computer interpretation of electrophysiological phenomena, as well as many other third-party services, which completely recently you could only dream of.
AECG today means more than just ECG monitoring in relation to the natural behavior of the subject, the study of the periodical cardiac arrhythmias, and its intervals, daily changes in heart rate variability (HRV), the control of drug therapy and cardiac pacemakers, but the approach to this variety of tasks on a good philosophical basis Chronobiology and chronomedicine.
Historically used several names method AECG - patient and ECG monitoring, dynamic electrocardiography, others, Holter monitoring as well.
AECG - a classic ECG Holter ECG with a record daily on a portable storage medium and delayed decryption. But this transtelephonic monitoring, monitoring of the activation record (event recorder - event recorder) patient in the required times they (the appearance of symptoms, stress tests, medications, etc.), as well as implantable device with the ability to record the ECG for months and even years.
Though AECG entered adulthood, not all just the moon. If the technique in AECG - a trick, with the interpretation of results is much more difficult, and without a good assistant can not do.
Part 3 - Jazz From Its Origins to the Present - The Twenties
Discussion based on the Course "Introduction to Jazz."
The text reference for the course is "Jazz: From Its Origins to the Present"
Text: ISBN: 0135121957/ ISBN-13: 9780135121955
Jazz: From Its Origins to the Present (Softcover)
by Lewis Porter, Ph.D., Michael Ullman, Edward Hazell
Prentice Hall, 1992, 512 pages, English
University Jazz Course
Music Excerpts from "Ken Burns Jazz, The Story of America's Music"
Frankie Trumbauer and his orchestra featuring Bix Beiderbecke, "Singing' the Blues," James P. Johnson, "Charleston," Duke Ellington, "East St. Louis Toodle-oo" and "Mood Indigo," Fletcher Henderson, "Sugar Foot Stomp."
