- tachycardia) because of rapid firing of the sinoatrial (sinus) node. This occurs in response to exercise, exertion, excitement, pain, fever, excessive thyroid hormone, low blood oxygen (hypoxia), stimulant drugs (such as caffeine), etc. The lack of normal sinus rhythm is an arrhythmia, an abnormal heart rhythm.
* * *a normal variation in the heart rate, which accelerates slightly on inspiration and slows on expiration. It is common in healthy individuals.
* * *the physiologic cyclic variation in heart rate related to vagal impulses to the sinoatrial node, which can be linked to or independent of the phases of respiration (see phasic a. and nonphasic a.). It is common, particularly in children, and is not considered abnormal.
Medical dictionary. 2011.
Look at other dictionaries:
sinus arrhythmia — a normal variation in the heart rate, which accelerates slightly on inspiration and slows on expiration. It is common in healthy individuals … The new mediacal dictionary
sinus arrhythmia nonrespiratory — nonphasic a … Medical dictionary
sinus arrhythmia respiratory — phasic a … Medical dictionary
Respiratory sinus arrhythmia — (RSA) is a naturally occurring variation in heart rate that occurs during a breathing cycle. Heart rate increases during inspiration and decreases during expiration. Heart rate is normally controlled by centers in the medulla oblongata. One of… … Wikipedia
[ECG]; simian adenovirus; simulated annealing [algorithm]; sinoatrial; sinus arrest; sinus arrhythmia; skeletal age; skin-adipose [unit]; sleep apnea; slightly active; slowly adapting [receptor]; soluble in alkaline medium; Spanish American; specific activity; spectrum analysis; sperm abnormality; s — sinoatrial; sinoauricular … Medical dictionary
Аритмия Синусовая (Sinus Arrhythmia) — нормальное изменение скорости сердечных сокращений, которая немного увеличивается во время вдоха и уменьшается во время выдоха. Синусовая аритмия часто встречается у здоровых людей. Источник: Медицинский словарь … Медицинские термины
Sinus rhythm — The normal regular rhythm of the heart set by the natural pacemaker of the heart called the sinoatrial (or sinus) node. It is located in the wall of the right atrium (the right upper chamber of the heart). Normal cardiac impulses start there and… … Medical dictionary
Sinus rhythm — is a term used in medicine to describe the normal beating of the heart, as measured by an electrocardiogram (ECG). It has certain generic features that serve as hallmarks for comparison with normal ECGs. ECG Structure There are typically five… … Wikipedia
Arrhythmia — An abnormal heart rhythm. In an arrhythmia the heartbeats may be too slow, too rapid, too irregular, or too early. Rapid arrhythmias (greater than 100 beats per minute) are called tachycardias. Slow arrhythmias (slower than 60 beats per minute)… … Medical dictionary
Arrhythmia, sinus — The normal increase in heart rate that occurs during inspiration (when you breathe in). This is a natural response and is more accentuated in children than adults. The sinus refers to the natural pacemaker of the heart which is called the… … Medical dictionary