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The order that allows to organize a succession of things through the repetition of cycles in certain time intervals is known as rhythm . Sinus , meanwhile, is that linked to a nodule of heart tissue or a breast.

The notion of sinus rhythm it is used in the medicine to name the heart beat that is considered normal . This is a reference value that can be measured through a electrocardiogram and that is linked to age and other factors.

The beating heart with sinus rhythm draws five different waves on the electrocardiogram with each beat. These waves they are generated in an order, with a relative size and during specific intervals. When the waves deviate from the sinus rhythm, they are likely to reveal the existence of some cardiac pathology. However, professionals know that there are rhythm changes that can be considered normal according to the context.

The sinus rhythm contemplates an average of between sixty and one hundred beats per minute. The waves that draw the beats on the electrocardiogram are identified with the letters P , Q , R , S and T : according to the analysis of these waves, the sinus rhythm can also be studied.

The Serie QRS , preceded by P , it has to extend between eighty and one hundred milliseconds. PR , meanwhile, should last between 120 and 200 milliseconds. These and others parameters reveal if the patient's heart beats in sinus rhythm.

Specifically, it is determined that a person is considered to have a normal sinus rhythm in relation to their heart when the following circumstances occur, revealed through the results of the electrocardiogram performed:
-The RR interval must be absolutely constant. We are referring to what is the distance between two successive R waves.
-Each P wave has to be followed by what a QS is.
-The interval called PR, which is the one that takes place between the beginning of the P wave until the beginning of the Q or R wave, is equal to or greater than what is 0.12 seconds.
-The heart rate of the person in question is between 60 and 100 beats per minute.
-The positive P wave is in II and the negative in aVR.

Among the main pathologies that an individual may suffer and that remain patent when performed, for example, the control of said sinus rhythm are:
-Tachycardia, which occurs when the heart rate is higher than the mentioned 60 beats per minute.
-Bradicardia, meanwhile, is the one that takes place when the aforementioned heart rate is below 60 beats per minute.
- Sinus tachycardia, which is characterized by the fact that it complies with all the characteristics that are determined to identify the sinus rhythm unless the heart rate exceeds 100 beats per minute.

It is important to keep in mind that, beyond the normal sinus rhythm revealed by an electrocardiogram, this characteristic does not rule out the existence of pathologies .

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