2 Atrial Rhythms and Supraventricular Tachycardias Online Quiz Questions

A 10-second ECG strip contains 13 QRS complexes. Using the calculation $13 \times 6$, estimate the ventricular rate. Enter a whole number in beats/min.

True or false: If a tachycardia has a wide QRS and its mechanism has not been established, it should be treated as potentially ventricular until expert assessment says otherwise.

A patient has a regular narrow-complex tachycardia at approximately 150/min. Which interpretation should prompt you to inspect the inferior leads and V1 for flutter waves?

An ECG shows a regular atrial rhythm with discrete P waves that differ from sinus P waves. The atrial rhythm continues even when AV conduction varies. What rhythm does this suggest?

True or false: When sinus tachycardia accompanies a fever, suppressing the heart rate is the preferred response even if the fever is not addressed.

A patient with a pulse is stable and has a regular, narrow-complex tachycardia. Which approach is supported by the safety-first framework?

An irregular rhythm is being assessed for multifocal atrial tachycardia. Select all findings that support MAT.

Which sinus-rhythm finding can indicate pre-excitation and support consideration of an AV re-entrant mechanism?

A patient with a tachycardia and a pulse develops hypotension and acutely altered mental status. Select all actions consistent with the safety-first framework.

True or false: A 2:1 second-degree AV block pattern alone can reliably be classified as Mobitz I or Mobitz II.

A patient with known or suspected pre-excitation develops a very rapid, irregular, wide-complex rhythm. Which response is most appropriate?

A trained athlete is asleep, has sinus P waves before each QRS, and has a heart rate of 48 beats/min. Explain how you would interpret this finding and what you would assess before deciding whether it needs treatment.

A patient has a regular rhythm at 118 beats/min. Each QRS is preceded by a consistent sinus P wave, and the rate increased gradually. Which rhythm best fits these findings?

At standard paper speed, a regular rhythm has four large boxes between successive R waves. Using the 300-divided-by-large-boxes method, what is the estimated rate? Enter a whole number in beats per minute.

An ECG shows an irregular rhythm with at least three distinct P-wave shapes, variable PR intervals, and an isoelectric baseline between P waves. Which rhythm best fits these findings?

A stable patient has a regular narrow-complex tachycardia at about 150 beats/min. What is the most appropriate next ECG-focused step before labeling the rhythm as AVNRT?

An ECG shows PR intervals that lengthen progressively until a P wave is not followed by a QRS, after which the sequence repeats. What is this second-degree AV block pattern called?

A patient with a tachycardia and a pulse develops hypotension and acutely altered mental status attributable to the rhythm. What is the appropriate immediate action under the safety-first framework?