ecg

Electrocardiogram(ECG)

Norma ECGl

P wave- Atrial depolarization

QRS- Ventricular depolarization

T wave- Ventricular repolarisation

In normal people- each P wave is followed by the QRS wave.

- P wave rate of 60 bpm- 100 bpm with less than 10 % variation

- If variation is more than 10%, its called sinus arrhythmia

- Rate more than 60 bpm,its called sinus bradycardia

- Rate more than 100 bpm, its called sinus tachycardia

Atrial flutter- A characteristic 'sawtooth' or 'picket-fence' waveform of an intra-atrial re-entry circuit usually at about 300 bpm and has a very slow ventricular response.

Wolf Parkinsons- white syndrome-irregularly irregular, wide complex tachycardia. impulses from the atria are conducted to ventricles via either both the AV node and accessory pathway producing a broad fusion complex or just the AV node producing a narrow complex (without a delta wave) or just the accessory pathway producing a very broad 'pure' delta wave.

Atrial fibrillation- there is no contraction of the atria as a whole. Since there is no uniform atrial depolarization, there is no P wave. Transmission of these multiple atrial impulses into the AV node is thought to occur at random, resulting in an irregular ventricular rhythm ( different QRS) height. The atrial rate is affected and not the ventricular rate.