Archives

Within the arch, the coronary arteries branch off first followed by three main arteries that branch to the brain (carotids) and the upper thorax (subclavian Read More

The left ventricle ejects blood into the aortic arch to the body. Within the arch, the coronary arteries branch off first followed by three main Read More

The 12-lead ECG provides 12 views of the heart. The 12 views are generated through only 10 electrodes. Four limb electrodes attach to the inner Read More

The PR interval is the time from the beginning of the atrial wave to the beginning of myocardial depolarization of the ventricles. Normally this takes Read More

A long QT interval, wider than 1/2 the R-R interval, is a significant risk factor for developing hemodynamically unstable dysrhythmias such as ventricular tachycardia and Read More

Pacer spikes should always have a waveform immediately afterwards. Failure to stimulate a depolarization is called loss of capture. An electronic pacemaker, or just pacemaker, Read More

A type of pre-excitation syndrome similar to Woolf-Parkinson-White with the accessory pathway connecting the atria to the distal portion of the bundle of His, thus Read More

Several major vessels enter and exit the heart. The arteries carry blood away from the heart while the veins bring blood to the heart. While Read More

The direction of an average (mean) vector is called the electrical axis. A vector is an arrow that represents the size and direction of a Read More

The region of the thorax behind the sternum and in front of the spine – includes the heart, esophagus, trachea and the major vessels attached Read More