Final Answer:
NCT (Narrow QRS Complex Tachycardia) represent Cardiac rhythm with QRS duration greater than 120 ms. Thus, the corrcet answer is option d) Cardiac rhythm with QRS duration greater than 120 ms.
Step-by-step explanation:
NCT, or Narrow QRS Complex Tachycardia, refers to a specific type of tachycardia where the QRS complex duration is greater than 120 milliseconds. In this context, "narrow" indicates a normal or near-normal QRS complex duration. Therefore, option (d) is the correct answer.
Tachycardia is a condition characterized by an abnormally rapid heart rate, typically exceeding 100 beats per minute. To classify it as Narrow QRS Complex Tachycardia, the duration of the QRS complex is a crucial factor. The QRS complex represents ventricular depolarization, and a narrow QRS complex suggests that the electrical impulse is conducted rapidly through the normal conduction pathways of the heart.
In electrocardiography (ECG), the duration of the QRS complex is measured in milliseconds. A QRS duration greater than 120 milliseconds is considered wide, indicating abnormal conduction through the ventricles. Therefore, in the case of NCT, the QRS duration is greater than 120 ms, signifying normal or near-normal conduction through the ventricles during the tachycardic rhythm. This distinction is vital for accurate diagnosis and appropriate management of cardiac arrhythmias. Therefore, the corrcet answer is option d) Cardiac rhythm with QRS duration greater than 120 ms.