Essay on Pacemaker

Essay ON PAcemaker A pacemaker (or artificial pacemaker, is a medical device that uses electrical impulses, delivered by electrodes contacting the heart muscles, to regulate the beating of the heart. The primary purpose of a pacemaker is to maintain an adequateheart rate, either because the heart’s native pacemaker is not fast enough, or there is a block in the heart’s electrical conduction system. Modern pacemakers are externally programmable and allow the cardiologist to select the optimum pacing modes for individual patients. Some combine a pacemaker anddefibrillator in a single implantable device.
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Others have multiple electrodes stimulating differing positions within the heart to improve synchronisation of thelower chambers of the heart. In 1958, Arne Larsson (1915-2001) became the first to receive an implantable pacemaker. He had a total of 26 devices during his life and campaigned for other patients needing pacemakers. In 1899, J A McWilliam reported in the British Medical Journal of his experiments in which application of an electrical impulse to the human heart in asystolecaused a ventricular contraction and that a heart rhythm of 60-70 beats per minute could be evoked by impulses applied at spacings equal to 60-70/minute. 1] In 1926, Dr Mark C Lidwell of the Royal Prince Alfred Hospital of Sydney, supported by physicist Edgar H Booth of the University of Sydney, devised a portable apparatus which “plugged into a lighting point” and in which “One pole was applied to a skin pad soaked in strong salt solution” while the other pole “consisted of a needle insulated except at its point, and was plunged into the appropriate cardiac chamber”. “The pacemaker rate was variable from about 80 to 120 pulses per minute, and likewise the voltage variable from 1. to 120 volts” In 1928, the apparatus was used to revive a stillborn infant at Crown Street Women’s Hospital, Sydney whose heart continued “to beat on its own accord”, “at the end of 10 minutes” of stimulation. [2][3] In 1932, American physiologist Albert Hyman, working independently, described an electro-mechanical instrument of his own, powered by a spring-wound hand-cranked motor. Hyman himself referred to his invention as an “artificial pacemaker”, the term continuing in use to this day. [4][5] An apparent hiatus in publication of research conducted etween the early 1930s and World War II may be attributed to the public perception of interfering with nature by ‘reviving the dead’. For example, “Hyman did not publish data on the use of his pacemaker in humans because of adverse publicity, both among his fellow physicians, and due to newspaper reporting at the time. Lidwell may have been aware of this and did not proceed with his experiments in humans”. [3] An external pacemaker was designed and built by the Canadian electrical engineer John Hopps in 1950 based upon observations by cardio-thoracic surgeonWilfred Gordon Bigelow at Toronto General Hospital .

A substantial external device using vacuum tube technology to provide transcutaneous pacing, it was somewhat crude and painful to the patient in use and, being powered from an AC wall socket, carried a potential hazard of electrocution of the patient by inducing ventricular fibrillation. A number of innovators, including Paul Zoll, made smaller but still bulky transcutaneous pacing devices in the following years using a large rechargeable battery as the power supply. [6] In 1957, Dr. William L. Weirich published the results of research performed at the University of Minnesota.

These studies demonstrated the restoration of heart rate, cardiac output and mean aortic pressures in animal subjects with complete heart block through the use of a myocardial electrode. This effective control of postsurgical heart block proved to be a significant contribution to decreasing mortality of open heart surgery in this time period. [7] The development of the silicon transistor and its first commercial availability in 1956 was the pivotal event which led to rapid development of practical cardiac pacemaking. In 1958, engineer Earl Bakken of Minneapolis, Minnesota, produced the first wearable external pacemaker for a patient of Dr.

C. Walton Lillehei. This transistorised pacemaker, housed in a small plastic box, had controls to permit adjustment of pacing heart rate and output voltage and was connected to electrode leads which passed through the skin of the patient to terminate in electrodes attached to the surface of the myocardium of the heart. The first clinical implantation into a human of a fully implantable pacemaker was in 1958 at the Karolinska Institute in Solna, Sweden, using a pacemaker designed by Rune Elmqvist and surgeon Ake Senning, connected to electrodes attached to the myocardium of the heart by thoracotomy.

The device failed after three hours. A second device was then implanted which lasted for two days. The world’s first implantable pacemaker patient, Arne Larsson, went on to receive 26 different pacemakers during his lifetime. He died in 2001, at the age of 86, outliving the inventor as well as the surgeon. [8] In 1959, temporary transvenous pacing was first demonstrated by Furman et al. in which the catheter electrode was inserted via the patient’s basilic vein. 9] In February 1960, an improved version of the Swedish Elmqvist design was implanted in Montevideo, Uruguay in the Casmu Hospital by Doctors Fiandra and Rubio. That device lasted until the patient died of other ailments, 9 months later. The early Swedish-designed devices used rechargeable batteries, which were charged by an induction coil from the outside. Implantable pacemakers constructed by engineer Wilson Greatbatch entered use in humans from April 1960 following extensive animal testing.

The Greatbatch innovation varied from the earlier Swedish devices in using primary cells (mercury battery) as the energy source. The first patient lived for a further 18 months. The first use of transvenous pacing in conjunction with an implanted pacemaker was by Parsonnet in the USA,[10][11][12] Lagergren in Sweden[13][14] and Jean-Jaques Welti in France[15] in 1962-63. The transvenous, or pervenous, procedure involved incision of a vein into which was inserted the catheter electrode lead under fluoroscopic guidance, until it was lodged within the trabeculae of the right ventricle.

This method was to become the method of choice by the mid-1960s. World’s first Lithium-iodide cell powered pacemaker. Cardiac Pacemakers Inc. 1972 The preceding implantable devices all suffered from the unreliability and short lifetime of the available primary cell technology which was mainly that of themercury battery. In the late 1960s, several companies, including ARCO in the USA, developed isotope powered pacemakers, but this development was overtaken by the development in 1971 of the lithium-iodide cell by Wilson Greatbatch.

Lithium-iodide or lithium anode cells became the standard for future pacemaker designs. A further impediment to reliability of the early devices was the diffusion of water vapour from the body fluids through the epoxy resin encapsulation affecting the electronic circuitry. This phenomenon was overcome by encasing the pacemaker generator in an hermetically sealed metal case, initially by Telectronics of Australia in 1969 followed by Cardiac Pacemakers Inc of Minneapolis in 1972. This technology, using titanium as the encasing metal, became the standard by the mid-1970s.

Others who contributed significantly to the technological development of the pacemaker in the pioneering years were Bob Anderson of Medtronic Minneapolis, J. G (Geoffrey) Davies of St George’s Hospital London, Barouh Berkovits and Sheldon Thaler of American Optical, Geoffrey Wickham of Telectronics Australia,Walter Keller of Cordis Corp. of Miami, Hans Thornander who joined previously mentioned Rune Elmquist of Elema-Schonander in Sweden, Janwillem van den Berg of Holland and Anthony Adducci of Cardiac Pacemakers Inc. Guidant