How does a sinus tachycardia appear on an ECG?

How does a sinus tachycardia appear on an ECG?

• A. Irregular rhythm with a heart rate below 100
• B. Regular rhythm with a heart rate greater than 100
• C. Irregular rhythm with a heart rate above 120
• D. Normal rhythm with bradycardia

Answer: (B)

A sinus tachycardia appears on an ECG as a regular rhythm, characterized by a heart rate that exceeds 100 beats per minute, typically ranging from 100 to 160 beats per minute. This condition reflects a physiological response, often initiated by factors such as stress, exercise, fever, or dehydration, leading to an increased firing rate of the sinoatrial (SA) node. Each P wave is followed by a QRS complex, maintaining the normal sequence of electrical activity in the heart, which confirms the classification of the rhythm as sinus tachycardia. Additionally, the regularity of the rhythm indicates a consistent pace, further supporting its diagnosis. This understanding is critical for interpreting ECG findings accurately and discerning normal from abnormal cardiac rhythms.

A sinus tachycardia appears on an ECG as a regular rhythm, characterized by a heart rate that exceeds 100 beats per minute, typically ranging from 100 to 160 beats per minute. This condition reflects a physiological response, often initiated by factors such as stress, exercise, fever, or dehydration, leading to an increased firing rate of the sinoatrial (SA) node. Each P wave is followed by a QRS complex, maintaining the normal sequence of electrical activity in the heart, which confirms the classification of the rhythm as sinus tachycardia. Additionally, the regularity of the rhythm indicates a consistent pace, further supporting its diagnosis. This understanding is critical for interpreting ECG findings accurately and discerning normal from abnormal cardiac rhythms.