• coronary sinus
  • The concentration of converging conduction tracts near the coronary sinus results in considerable automaticity activity originating in that area. (wikipedia.org)
  • The function of the right heart, is to collect de-oxygenated blood, in the right atrium, from the body via the superior vena cava, inferior vena cava and from the coronary sinus and pump it, through the tricuspid valve, via the right ventricle, through the semilunar pulmonary valve and into the pulmonary artery in the pulmonary circulation where carbon dioxide can be exchanged for oxygen in the lungs. (wikipedia.org)
  • potentials
  • This term refers to a response of the heart at rapid periodic pacing in which action potentials alternate between short and long durations. (duke.edu)
  • There was significant regional conduction slowing with double potentials and fractionation associated with areas of low voltage and electrical silence (or scar). (biomedsearch.com)
  • To obviate this limitation we developed an approach based on inferred epicardial potentials in the frequency domain from 190-surface ECGs using individualized heart-torso models. (biomedsearch.com)
  • The SA node controls the rate of contraction for the entire heart muscle because its cells have the quickest rate of spontaneous depolarization, thus they initiate action potentials the quickest. (wikipedia.org)
  • Ectopic
  • Ectopic beats often remain undetected and occur as part of minor errors in the heart conduction system. (wikipedia.org)
  • Ectopic pacemakers can occur within healthy hearts in response to various stimulating events, such as: Increased local parasympathetic nervous system activity Elevated sympathetic nervous system output Overstimulation from drugs such as caffeine, digitalis and catecholamines. (wikipedia.org)
  • Hypertrophic
  • Hypertrophic growth of the heart occurs in many clinical scenarios, and it confers substantially increased risk of untoward sequelae. (biomedsearch.com)
  • Impact of chronic DDD pacing on time-domain indexes of heart rate variability in patients with hypertrophic obstructive cardiomyopathy. (biomedsearch.com)
  • The aim of this study was to examine whether DDD pacing affects time-domain indexes of heart rate variability (HRV) in patients with hypertrophic obstructive cardiomyopathy (HOCM). (biomedsearch.com)
  • Consistent with the direct transactivation of numerous cardiac genes reactivated in response to hypertrophic stimulation, cardiac transcription factors are profoundly involved in the generation of cardiac hypertrophy or in cardioprotection from cytotoxic stress in the adult heart. (wikipedia.org)
  • diseases
  • The non-invasive localization of focal heart activity via body surface potential measurements (BSPM) could greatly benefit the understanding and treatment of arrhythmic heart diseases. (biomedsearch.com)
  • Specialists who focus on diseases of the heart are called cardiologists, although many specialties of medicine may be involved in treatment. (wikipedia.org)
  • There are many inherited conditions and heart diseases that can affect young people which can subsequently cause sudden death without advance symptoms. (wikipedia.org)
  • It may be also be due to onset of acute coronary syndrome, heart failure, conduction system diseases with enhanced automaticity, or administration of theophylline. (wikipedia.org)
  • Furthermore
  • Furthermore, abundant expression of Csx, the presumptive mouse homolog of tinman, is observed only in the heart from the time of cardiac differentiation. (wikipedia.org)
  • left atrium
  • The left coronary artery distributes blood to the left side of the heart, the left atrium and ventricle, and the interventricular septum. (wikipedia.org)
  • In the heart's conduction system, Bachmann's bundle (also called the Bachmann bundle or the interatrial tract) is a branch of the anterior internodal tract that resides on the inner wall of the left atrium. (wikipedia.org)
  • In the left heart oxygenated blood is returned to the left atrium via the pulmonary vein. (wikipedia.org)
  • Histological
  • Working under the guidance of his mentor, Ludwig Aschoff, Tawara performed a histological examination of 150 hearts with myocarditis (which led to the discovery of Aschoff bodies), and he began examining the atrioventricular bundle before embarking on a comprehensive study of the anatomy and histology of the heart's conduction system. (wikipedia.org)
  • patients
  • However, long-term conduction delay was common in 44% (12/27) of patients having a QRS duration greater than 98th percentile for the age at the most recent electrocardiogram. (biomedsearch.com)
  • This may contribute to the unfavourable outcome of patients with intraventricular conduction delay. (biomedsearch.com)
  • In conclusion, our findings indicate that long-term pacing in HOCM patients restores the sympathovagal balance in the heart by increasing vagal activity. (biomedsearch.com)
  • Some patients describe this experience as a 'flip' or a 'jolt' in the chest, or a 'heart hiccups', while others report dropped or missed beats. (wikipedia.org)
  • rhythm
  • Medications for a fast heart rate may include beta blockers or agents that attempt to restore a normal heart rhythm such as procainamide. (wikipedia.org)
  • irregular
  • Heart arrhythmia, also known as cardiac dysrhythmia or irregular heartbeat, is a group of conditions in which the heartbeat is irregular, too fast, or too slow. (wikipedia.org)
  • prolongation
  • They are the most common causes of bradycardia: First degree heart block, which manifests as PR prolongation Second degree heart block Type 1 Second degree heart block, also known as Mobitz I or Wenckebach Type 2 Second degree heart block, also known as Mobitz II Third degree heart block, also known as complete heart block. (wikipedia.org)
  • right atrium
  • Commonly the right atrium and ventricle are referred together as the right heart and their left counterparts as the left heart. (wikipedia.org)
  • The heart receives blood low in oxygen from the systemic circulation, which enters the right atrium from the superior and inferior venae cavae and passes to the right ventricle. (wikipedia.org)
  • The right atrium and the right ventricle together are sometimes referred to as the right heart. (wikipedia.org)
  • blockage
  • Therefore, this ability is somewhat restricted in the heart so a coronary artery blockage often results in myocardial infarction causing death of the cells supplied by the particular vessel. (wikipedia.org)
  • This is because blockage of one coronary artery generally results in death of the heart tissue due to lack of sufficient blood supply from the other branch. (wikipedia.org)
  • Premature
  • A premature contraction will not follow the normal signal transduction pathway, and can render the heart refractory or incapable of transmitting the normal signal from the SA node. (wikipedia.org)
  • structural
  • Sudden arrhythmic death syndrome (SADS), is a term used as part of sudden unexpected death syndrome to describe sudden death due to cardiac arrest brought on by an arrhythmia in the presence or absence of any structural heart disease on autopsy. (wikipedia.org)
  • slightly
  • The largest part of the heart is usually slightly offset to the left side of the chest (though occasionally it may be offset to the right) and is felt to be on the left because the left heart is stronger and larger, since it pumps to all body parts. (wikipedia.org)
  • apex
  • The lower tip of the heart, the apex, lies to the left of the sternum (8 to 9 cm from the midsternal line) between the junction of the fourth and fifth ribs near their articulation with the costal cartilages. (wikipedia.org)
  • The heart is cone-shaped, with its base positioned upwards and tapering down to the apex. (wikipedia.org)
  • neurons
  • Also, experiments suggest that normal non LHON affected retinal ganglion cells produce less of the potent superoxide radical than other normal central nervous system neurons. (wikipedia.org)
  • These experiments may in part explain the death of LHON affected retinal ganglion cells in preference to other central nervous system neurons which also carry LHON affected mitochondria. (wikipedia.org)
  • A hypothesis or explanation behind the mechanism is "one-way", "master-slave", or "unidirectional synchronization" effect as mathematical and fundamental property of non-linear dynamic systems (oscillators like neurons) to synchronize under certain criteria. (wikipedia.org)
  • posterior
  • On the posterior surface of the heart, the right coronary artery gives rise to the posterior interventricular artery, also known as the posterior descending artery. (wikipedia.org)