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            Use as a pharmacological test (3-stimulants (isoproterenol, isoproterenol, and others) also did not increase the frequency of cardiac rhythm.
            The most informative test with high-frequency electrical endokardialnoystimulyatsiey suppress ing automaticity of sinus node. After the cessation of pacemaker disappears sinus rhythm of the heart, to restore which takes a long time - up to 2000-6000 ms.
            Paroxysmal tachycardia is characterized by sudden onset Ei same abrupt end attack.
            Differ supraventrikulyarnoya paroxysmal tachycardia, which may be essential and ekstrasistolicheskoy.Harakterizuetsya correct rhythm, NeIZMeNeNN1 m ludochkovym same complex.
            The ECG QRS complex is not changed. Complaints of patients with very diverse. Worried about frequent serdiebienie, a sense of compression, retrosternal pain and shortness of breath. With long lasting seizures heart failure develops.
            Of greater clinical significance is the ventricular form of paroxysmal tachycardia. In this form there is abnormal heart rhythms. If we take the pulse of every moment, you can determine the difference in 6-8 hits. The rhythm does not change with pressure on the carotid sinus.
            The ECG QRS complex is deformed, P wave, arising from the normal rate, ie, regardless of the ventricular rhythm is usually superimposed on the deformed QRS complexes and therefore can not be identified.
            After a prolonged attack of paroxysmal tachycardia detected signs of myocardial damage (decrease in the interval S-T).
            Ventricular paroxysmal tachycardia appears under the influence of impulses coming from the bundle of His, his legs or from the peripheral branches conducting ing system of the heart. The ECG in connection with the recorded symptoms that resemble the symptoms characteristic of blockades leg bundle branch block. The frequency rate is within the 140-200 in 1 min. There is a dissociation in the activity of the atria and ventricles, which leads to marked changes in hemodynamics, decrease blood pressure, heart failure, cerebral ischemia and significant violation of the patient. The appearance of paroxysmal ventricular tachycardia in a pain-sh dignity of the cases preceded by ventricular premature beats. At the same QRS complex is broadened by more than 0.12 sec and reminds ventricular yu ekstrasystolu.
     Differential diagnosis of paroxysm A L n s s t and x and p and q and the second is based on changes in electrocardiographic indices.
            Extrasystoles. Depending on the location differentials yutsya atrial extrasystoles, ventricular and originating from the atrioventricular connection.

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