Sinus rhythm is normal heart rate.
Electrocardiogram is the most common examination in cardiology. Every beat of the heart is completed under the control of electric pulses. Without electric pulses, the heart would not beat. Many diseases in clinic need ECG to help identify and diagnose, such as arrhythmia and acute myocardial infarction.
There are pathways in the heart that control cardiac electrical impulses, including sinus node, atrioventricular node, left and right bundle branches and Purkinje fibers. The starting point of electric pulse is sinoatrial node, which is like a commander who gives orders. The command transmitted to the left and right bundle branches and Purkinje fibers along the atrioventricular node will cause myocardial contraction and relaxation. Every time a signal is given, the heart will beat.
Sinus node sends out impulses, and the rhythm formed by conduction along the pathway is called sinus rhythm. So generally speaking, sinus rhythm is normal rhythm, if it is not sinus rhythm, it is abnormal. Such as sinus tachycardia and sinus bradycardia. If the sinus rhythm is too fast and the frequency exceeds 100 beats/min, it will become sinus tachycardia. Healthy people smoking, drinking, drinking coffee, drinking tea and being emotional can all cause sinus tachycardia. Sinus bradycardia is caused by sinus bradycardia when the frequency is less than 60 beats/min. Common in athletes or sleeping. Many diseases can also lead to sinus tachycardia or sinus bradycardia.
Most premature beats are benign.
Premature cardiac contraction is a common arrhythmia in cardiology. Many patients feel that their heartbeat or pulse is intermittent or missed. In fact, most clinical premature beats are benign and generally have a good prognosis. Premature beats are actually premature beats. There are many kinds of premature beats, among which atrial premature beats and ventricular premature beats are more common. Fatigue, emotional excitement, poor sleep, stress, drinking, drinking coffee or strong tea can all cause premature beats. Premature beats can also occur in coronary heart disease, hypertension, valvular disease (rheumatic heart disease), cardiomyopathy, hyperthyroidism and other diseases.
Generally speaking, the type and quantity of premature beats will be evaluated according to 24-hour dynamic electrocardiogram in clinic. That is to say, what kind of premature beats are seen through 24-hour dynamic electrocardiogram, and whether there are more or less premature beats. Different types and quantities, different treatment schemes and drugs.
Be calm when doing ECG.
An electrocardiogram, the horizontal axis is the time axis, and the vertical axis is the voltage axis, which is the amplitude. Electrocardiogram (ECG) produced by cardiac primary power generation activity includes P wave, QRS wave and T wave, as well as PR interval and ST segment. Simply put, P wave is the electrical activity of atrial contraction, QRS complex is the electrical activity of ventricular contraction, and T wave is the electrical activity of ventricular relaxation. Under normal circumstances, after the electric pulse reaches the atrium, it immediately reaches the ventricle, causing the ventricle to contract, pumping blood to the blood vessels of the whole body and supplying blood to various organs of the whole body.
The electrocardiogram reported by physical examination also common arrhythmia such as atrioventricular block, left bundle branch block, right bundle branch block, left ventricular high voltage, ST-T segment change and preexcitation syndrome. Atrioventricular block refers to the delay of electric pulse to atrium for a long time or not to ventricle. The left bundle branch block indicates that the electrical pulse has an obstacle to the left ventricle, and the right bundle branch block indicates that the electrical pulse has an obstacle to the right ventricle. Left ventricular high voltage refers to the relatively high voltage during ventricular contraction, which is easy to appear in general hypertension and hypertrophic cardiomyopathy. The change of ST-T segment is ventricular diastolic abnormality. Generally speaking, ST-T segment changes are most likely to occur during myocardial ischemia or myocardial infarction. Of course, there are also many non-ischemic ST-T segment changes. Whether the above arrhythmia is serious or not, the specific problems are analyzed.
You don't need an empty stomach before doing an ECG, and you can do it at any time in the hospital. Let yourself be quiet before you do it, and try to avoid strenuous activities and nervousness. Because ECG will expose the chest, so try to wear loose clothes. Try to keep normal breathing when doing ECG, don't answer the phone, and don't move your limbs to avoid interfering with ECG signals.