Система Orphus

Symptoms of disease - violation of ventricular repolarization

Repolarization (Repolarization) - phase, during which the restored original resting potential membrane of the nerve cell after passing through it, the nerve impulse. During the passage of the nerve impulse is to temporarily change the molecular structure of the membrane, as a result of which ions can freely pass through it. During the repolarization of Jonah diffuse in the reverse direction for the restoration of the former electric charge of the membrane, after which the nerve is ready for further transfer by him of the pulses.



Which diseases there is violation of ventricular repolarization

The teeth of the electrocardiogram, their duration and intervals between them. In clinical conditions ECG record on specially lined paper, which allows you to quickly measure the standard time intervals and the voltage of the tines. The line of time intervals are at a distance of 1 mm from each other, every fifth line is highlighted in thickness. The standard speed of the paper is 25 mm/s. Thus, the distance of 1 mm runs for 0,04 with (thin line), and the distance 5 mm the 0,20 with (thick line). Horizontal lines are also located at a distance of 1 mm from each other. This allows you to calibrate the voltage deviations from the contour lines. It is considered that 10 mm vertical correspond to 1 mV.

The duration of the QRS complex (from 0.04-0.10 sec) corresponds to the time required for the depolarization of the myocardium of the ventricles. It may be a little increase in regional blockade, affecting part of the intraventricular specific conducting tissue, or to a slowing conduction in any division ventricular muscle. To a much greater extent increases the duration of a micro violation of conductivity at the level of branch of beam Guisa. Approximate idea of refractory period of the ventricles can be obtained by measuring the interval Q-T: from the beginning of the QRS complex to the end of detection. The value of the interval Q-T depends on the frequency of cardiac contractions and may significantly change under the influence of many pathophysiological or pharmacological factors.

Violation of ventricular repolarization: segment ST, the teeth of the T and U.

The norm on the electrocardiogram segment ST isoelectric and has the same potential as the interval between the tooth T and followed by a notch R. Deviations ST segment from the contour lines arise as a result of damage to the heart muscles, violations of the synchronicity of the depolarization of the myocardium of the ventricles, as well as under the influence of pharmacological preparations and the change elektrolitnogo balance. Elevatsiya ST-segment, combining with the displacement of up point at which the segment ST departs from the QRS complex, the so-called point j, can be a variant of the norm, especially among younger people. The most frequent causes of pathological ST segment elevation serve as myocardial infarction and pericarditis. In connection with this it is necessary to differentiate its normal and pathological elevation. Horizontal depression of the ST segment or smooth its transition to a negative peak T arise due to myocardial ischemia, a heavy load on the ventricle, the changes in the nature of ventricular depolarization or as a result of receiving pharmacological preparations.

Since the depolarization of ventricular infarction is distributed in the direction of the endocardium to epicardium, and repolarization is an electric current, the return of depolarization, it would be possible to expect, that the direction of detection will be the opposite of the orientation of the QRS complex, if the sequence of repolarization was the same as the depolarization. However, the peak detection is usually focused in the same direction as the main prong set of QRS. In this connection it is considered, that the direction of the normal repolarization back edge of depolarization - from epicardium to endocarditis. Peak T is considered pathological, if the voltage is small, he flattened or inverted in the lead, in which he usually has a normal height, or on the contrary, if the peak T excessively high and jagged. In vector interpretation of inversion zubza T evident increase of the angle between the vector of the QRS complex and vector detection.

Among the most common causes of ventricular repolarization include:
- ischemic heart disease,
- hypertrophy and overvoltage infarction myocardium,
- violations of the order of depolarization,
- elektrolitny imbalance
- pharmacological impact.
However violation of repolarization are nonspecific.



Which doctor should I contact if there is a violation of ventricular repolarization

  • Cardiologist


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Do you feel disrupted ventricular repolarization? You should be very careful approach to your health in general. People pay not enough attention to the symptoms of the disease and don't realize that these diseases can be critically dangerous. There are many diseases that in the beginning didn't manifest in our body, but in the end it turns out, unfortunately, it have already been treated too late. Every disease has its own specific features typical symptoms - called symptoms of the disease. Definition of symptoms is the first step in the diagnosis of diseases in general. You just need a few times a year to be screened by a doctor, not only to prevent a terrible disease, but also to maintain a healthy spirit in a body and the organism in general.

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