Daily Archive 24.11.2018

Performing stress tests

Performing stress tests

Performing exercise tests is useful for assessing rhythm disturbances caused by physical exercise, especially ventricular extrasystoles (VE) and ventricular tachycardias, for distinguishing pathological mechanisms caused by autonomic dysfunction and structural changes, as well as for diagnosing lesions of the sinus and atrioventricular nodes and for evaluating frequency-dependent cuts arrhythmogenic effects of antiarrhythmic drugs.

Samples with a load are also used for an approximate assessment of the refractory period of additional pathways in patients with Wolff-Parkinson-White syndrome. Intracardiac electrophysiological examination is used to diagnose rhythm and conduction disturbances when ECG imaging from the body surface is insufficient. Multielectrode catheters are located at various points inside the heart, allowing you to find out the sequence in which the excitation is distributed through the atria, the AV connection and the ventricle. It is also possible to identify the localization of pathological pathology, the source of supraventricular tachyarrhythmias and explore the mechanisms of ventricular tachyarrhythmias. In addition, using the electrophysiological study, you can determine the localization of the atrioventricular block (AV-blockade).

During the operation, mapping of the site of origin of both supraventricular and ventricular tachyarrhythmias can be performed using probes guided by the hand of the researcher or special multi-contact electrodes in order to establish the localization of the area for surgical destruction. Previously, the treatment of cardiac arrhythmias was limited to pharmacological and surgical methods.

However, surgical methods for mapping most of the supraventricular arrhythmias and certain types of ventricular arrhythmias are replaced by mapping with a catheter and destruction performed in the electrophysiology department. Implantable devices are often used for long-term treatment of both tachy and bradyarrhythmic conditions.