Lead V9

Lead V9 is a lead in which the active electrode is located in the fifth intercostal space on the left along the paravertebral line.

This standard lead is used to record the electrical activity of the heart from the back in the left lower lobe of the lung. It allows you to evaluate the functioning of the left ventricle and the posterior wall of the left atrium.

Lead V9 makes it possible to diagnose ischemia of the posterior wall of the left ventricle, myocardial infarction of posterior localization, and left ventricular hypertrophy. In addition, it can detect conduction disturbances in the posterior branch of the left bundle branch.

Thus, lead V9 is an important tool for assessing the condition of the posterior chambers of the heart during electrocardiography.

Lead V5/V9, electrocardiogram

**Electrocardiogram** is a recording of the electrical fields created by myocardial current. The appearance of these fields is due to the excitation of the heart muscle, which generates a change in the electric field potential (depolarization). Pronounced myocardial current is generated at a frequency of 60-90 per second.

***V5*** - fifth intercostal position along the right parasternal line in the area of ​​the apex of the heart. This position is often called “meridian” (“line”) in English. Since the intercostal spaces are approximately equal and the heart has