Qt

(a) Normal SA node rhythm

(b) Sinus rhythm

Vertical: 2 major squares = 1 mV; horizontal: 5 major squares = 1 s

Atrial tachycardia

Different examples of atrial fibrillation

(e) Different examples of ventricular tachycardia

Torsades de pointes

Figure 1 Typical ECG tracings for various atrial and ventricular arrhythmias. These tracings can be compared with a normal ECG shown at the top of the figure as (a) a stylized representation to show ECG intervals and as (b) an actual trace. The arrhythmias are: (c) atrial tachycardia, (d) atrial fibrillation, (e) ventricular tachycardia, (f) Torsades de pointes, and (g) ventricular fibrillation. In the traces, the vertical represents voltage and the horizontal, time.

Different examples of ventricular fibrillation

Figure 1 Typical ECG tracings for various atrial and ventricular arrhythmias. These tracings can be compared with a normal ECG shown at the top of the figure as (a) a stylized representation to show ECG intervals and as (b) an actual trace. The arrhythmias are: (c) atrial tachycardia, (d) atrial fibrillation, (e) ventricular tachycardia, (f) Torsades de pointes, and (g) ventricular fibrillation. In the traces, the vertical represents voltage and the horizontal, time.

6.33.1.1.3.3 Ventricular fibrillation

Ventricular fibrillation in humans is rapidly fatal unless it is reverted within a few minutes by DC cardioversion. Unconsciousness occurs within seconds of onset as a result of an instantaneous loss of cardiac output, and a resulting precipitous fall in blood pressure. The classic characteristic ECG pattern is of a noisy baseline lacking any discernible pattern (Figure 1g). However, since VTand torsades can degenerate into VF intermediate ECG patterns between the

Blood Pressure Health

Blood Pressure Health

Your heart pumps blood throughout your body using a network of tubing called arteries and capillaries which return the blood back to your heart via your veins. Blood pressure is the force of the blood pushing against the walls of your arteries as your heart beats.Learn more...

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