Lead V7

Lead V is one of the most popular leads in electrocardiography. It is used to determine the electrical activity of the heart, as well as to diagnose various diseases. In this article we will look at lead V7, which is one of the variations of lead V.

Lead V7 is a lead in which the active electrode is located in the fifth intercostal space on the left along the posterior axillary line (in the fifth intercostal space on the left along the posterior axillary line). This lead is used to study the electrical activity of the left ventricle and left atrium.

To carry out lead V7, it is necessary to place the active electrode on the skin in the fifth intercostal space on the left along the posterior axillary line, and then connect it to the electrocardiograph. A second electrode is then placed on the patient's right arm or right leg, depending on which area of ​​the heart needs to be examined.

When performing lead V7, various abnormalities in the electrical activity of the heart can be detected. For example, during a myocardial infarction, changes in the ST and T waves may be seen, which indicate damage to the heart muscle. It is also possible to detect cardiac conduction disorders such as blockades and arrhythmias.

Thus, lead V7 is an important tool in the diagnosis of various heart diseases and provides important information about its electrical activity.

What is lead V? Lead V8 (aVF) and V6 (V) *Indications*:* For all heart diseases accompanied by rhythm disturbances, it is necessary to determine the ischemic nature of the arrhythmia.* To assess the effectiveness of drug treatment for tachycardias.* With bradycardia, there is a danger of an imbalance of the sympathetic and parasympathetic divisions of the autonomic nervous system system, which can lead to complications.* Diagnosis of pulmonary embolism.*

Basic *principles*: *It is necessary to perform an ECG with an increased number of chambers (6–8), register the electrical axis of the heart, determine the sequence of P and QRS waves in relation to the isoelectric line.* Establish a pronounced S wave in lead V: S > R > T. If the S wave is not visible, it is necessary to clarify whether there is hyperkalemia (POTASSIUM⁺ - PLASMA, POTASSIUM⁻ - IONOMER)*.* Determine the presence of the U wave and its relationship in duration with the R wave on the ECG.* Eliminate device malfunction.* Serial do not record ECG from one place.* Assess the ratio of R and T waves in all standard leads.*

Studies using 24/7 TEES can reveal 3 different patterns of myocardial ischemia*:* resting:* “Avoided” ischemia, which is accompanied by the absence of complex acute events and ventricular ectopic arrhythmias.* Acute ischemia:* More than 75% of the myocardium remains without blood flow for more than 5 seconds (corresponding to more than 4 points on the Canadian Society of Cardiovascular Prevention scale)* transient ischemia* lasting less than 5 s (“Anticipatory” ischemia).* Set interval