Q. Electrocardiography: Why is the ECG termed as "PQRST" and not (for example) ABCDE?

Doctor Answer is medically reviewed by SecondMedic medical review team.

Answered by Secondmedic Expert

ECG stands for electrocardiography, an important medical diagnostic tool used to detect irregularities in the electrical activity of the heart.

The components that make up an electrocardiogram are referred to by their initial letters: P, Q, R, S and T. Each component stands for a corresponding stage of cardiac electrical cycle known as 'the cardiac rhythm'. The P-wave corresponds with atrial depolarization; the Q-wave represents depolarization leading to ventricular contraction; the R-wave suggests ventricular systolic excitation; and finally, the S-T segment invites repolarization.

Therefore ECG is termed as ‘PQRST’ and not (for example) ABCDE as these five letters represent distinct stages of cardiac electrical cycle in sequence. This sequence is integral diagnostically in order to accurately examine a patient's heart rhythm or any pathological abnormalities related it.

See all

Live Doctor consultation
Live Doctor Chat

Looking for expert medical advice and care can be a daunting task, especially when you need it urgently. But with Second Medic, you can connect with the best doctors in just a few minutes and have a private care conversation with them, all for free!

Our platform is designed to make it easy for you to get the medical advice and care you need without any hassle. Whether you have a minor health concern or a serious medical condition, our team of experienced doctors are here to help.

At Second Medic, we understand the importance of timely and reliable medical advice. That's why we've made it our mission to provide you with the best possible care, at the convenience of your own home.

Our platform is easy to use, and you can connect with a doctor in just a few simple steps. All you need to do is create an account, tell us about your health concern, and we'll match you with a doctor who has the expertise to help you.

You can then have a private care conversation with your doctor, where you can discuss your symptoms, medical history, and any other concerns you may have. Our doctors will then provide you with expert advice and guidance on the next steps to take.

So, whether you're looking for medical advice, a second opinion, or a prescription refill, Second Medic has got you covered. With our platform, you can get the care you need, when you need it, all for free!