Definition of Normal Heart Rate
In normal circumstances and the rest, the adult heart will beat regularly between 60-100 beats / min. The speed of heart rate is determined by the speed of electrical signals originating from the pacemaker, the SA node. Electrical signals from the SA node to flow through both the porch, causing the two porch to contract blood to the second chamber. Then the electrical signal is flowing through the AV node to reach the second chamber. This causes the two chambers to contract and pump blood throughout the body produces pulses (pulse). This regular electrical conduction from the SA node to AV node causes irregular contractions of the heart muscle, known as sinus rhythm (sinus beat). The period of rest, the speed of electrical signals from the SA node is slow, so the heart beats too slowly. When exercising or when very delight, the speed of electrical signals from the SA node become the heartbeat too fast so be quick.
Tachycardia that occurs because of rapid expenditure electrical signal by the SA node is called sinus tachycardia. Sinus tachycardia is usually rapid contraction of normal heart in response to a condition or illness. Sinus tachycardia can cause heart pounding. Causes of sinus tachycardia include pain, fever, excessive thyroid hormone, low blood oxygen levels, coffee and drugs such as cocaine and amphetamines. Within this scope, the sinus tachycardia is an adequate answer from the heart to stress, and this does not indicate a heart muscle disease, heart valve and electrically conductive system. However in some patients, sinus tachycardia can be a symptom of heart failure or significant heart valve disease.
Symptoms of Heart Arrhythmia
Arrhythmia is a pattern and / or rapid change from normal heart rate. Some patients have an entirely unaware of arrhythmia. Others have complained of symptoms including palpitations, a feeling or vibration heart leap, dizziness, shortness of breath or chest pain.
In tachycardias and bradycardias to any shortage of blood flow to the brain, the coronary arteries and other body parts. Poor blood flow to the brain can cause dizziness or loss of consciousness or fainting (syncope). Poor blood supply to the coronary arteries causes angina. Inadequate blood supply to other parts of the body causing fatigue and shortness of breath.
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