What are Q R and S wave?

Q, R, and S waves are components of the QRS complex in an electrocardiogram (ECG), which represents the electrical activity of the heart during ventricular depolarization. The Q wave is a small negative deflection, the R wave is a large positive deflection, and the S wave is a negative deflection that follows the R wave. Together, these waves indicate the heart's response to electrical signals and are crucial for diagnosing various cardiac conditions. The QRS complex typically lasts between 0.06 to 0.10 seconds in a healthy individual.