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The sinoatrial node (SA node) is the primary pacemaker of the heart. It is a region of cardiac muscle on the wall of the upper right atrium near to the superior vena cava entrance. The cells that make up the SA node are specialized cardiomyocytes known as pacemaker cells that can spontaneously generate cardiac action potentials.
The primary purpose of a pacemaker is to maintain an even heart rate, either because the heart's natural cardiac pacemaker provides an inadequate or irregular heartbeat, or because there is a block in the heart's electrical conduction system. Modern pacemakers are externally programmable and allow a cardiologist to select the optimal pacing ...
Cardiology (from Ancient Greek καρδίᾱ (kardiā) 'heart' and -λογία () 'study') is the study of the heart. Cardiology is a branch of medicine that deals with disorders of the heart and the cardiovascular system.
This page was last edited on 2 January 2015, at 22:11 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
In pacemaker cells (e.g. sinoatrial node cells), however, the increase in membrane voltage is mainly due to activation of L-type calcium channels. These channels are also activated by an increase in voltage, however this time it is either due to the pacemaker potential (phase 4) or an oncoming action potential. The L-type calcium channels are ...
Sir Brian Gerald Barratt-Boyes KBE (born Brian Gerald Boyes, 13 January 1924 – 8 March 2006) was a pioneering New Zealand cardiothoracic surgeon.He was known for early development of cardiopulmonary bypass surgery, early implantation of a cardiac pacemaker before these devices became commercially available in 1961, early use of human cadaveric aortic homografts for aortic valve replacement ...
Basic life support (BLS) is a level of medical care which is used for patients with life-threatening condition of cardiac arrest until they can be given full medical care by advanced life support providers (paramedics, nurses, physicians or any trained general personnel).
This program accepts applications for university lecturers that wish to put their courses online, and gives grants of between $10,000 – 15,000 CAD per course that is put online, and made available free of charge to the general public (ibid.). The most prestigious award is for the "national level CQOCW", then there is "provincial level" and ...