Wide QRS Complex: Causes & Diagnosis

What QRS interval duration is generally considered widened?

Which of the following is a cause of widened QRS complexes?

The presence of a Bundle Branch Block (BBB) in a sinus rhythm implies what about the PR interval?

In which of the following conditions would a widened QRS complex likely be observed on an ECG?

Bundle branch blocks cause widened QRS complexes because they:

What is the mechanism by which pacemakers can cause a widened QRS complex?

Which of the following best describes the origin and conduction of impulses in ventricular rhythms that lead to a widened QRS complex?

A patient with a pacemaker exhibits widened QRS complexes on their ECG. Which of the following is the MOST likely reason for this finding?

A patient's ECG shows a QRS complex duration of 0.14 seconds in lead V1. Which of the following conditions is MOST likely contributing to this finding?

Which of the following rhythms is characterized by a heart rate of less than 20 beats per minute and wide QRS complexes?

Which rhythm is characterized by a rate typically between 20-40 beats per minute, regular regularity, absent P waves, and wide QRS complexes?

A patient's ECG shows a series of wide and bizarre QRS complexes occurring in a regular pattern at a rate of 60 beats per minute. P waves are not visible. This rhythm is MOST likely:

Which of the following ECG characteristics is typically associated with premature ventricular complexes (PVCs)?

What term describes a pattern on an ECG where every other beat is a PVC?

Which of the following is a potential cause of premature ventricular complexes (PVCs)?

A patient's ECG shows a rhythm with a rate of 180 bpm, wide QRS complexes, and absent P waves. The patient is likely experiencing:

Which of the following interventions is MOST appropriate for a patient experiencing ventricular tachycardia?

In the context of premature ventricular complexes (PVCs), what does the term 'unifocal' indicate?

Which ventricular dysrhythmia is characterized by a twisting of the points around the baseline on an ECG?

Which of the following is a common cause of Torsades de Pointes?

A patient's ECG displays a rapid, irregular rhythm with no identifiable P waves, QRS complexes, or T waves. This rhythm is MOST consistent with:

The MOST appropriate immediate treatment for ventricular fibrillation is:

An ECG shows a QRS duration of 0.16 seconds in lead V1, an RSR' pattern, and T wave inversion. Which of the following is the MOST likely cause?

Which of the following is the MOST likely cause of agonal rhythm?

A patient presents with a wide complex tachycardia. Which of the following clinical factors would MOST strongly suggest that the rhythm is ventricular tachycardia rather than supraventricular tachycardia with aberrant conduction?

A patient's ECG shows a pattern of ventricular trigeminy. How many normal beats occur between each PVC in this pattern?

A patient is diagnosed with Accelerated Idioventricular Rhythm (AIVR) following thrombolytic therapy for a myocardial infarction. What is the MOST likely underlying cause of the AIVR in this scenario?

A 70-year-old patient with a history of coronary artery disease and hypertension presents with new-onset dizziness and palpitations. An ECG reveals a wide-complex tachycardia with a rate of 180 bpm. The QRS complexes are uniform in morphology. Which finding would be MOST concerning and warrant immediate intervention?

Which of the following ECG findings is MOST specific to Torsades de Pointes?

In the setting of ventricular fibrillation, what is the primary goal of immediate defibrillation?

A 60-year-old male with a history of a large anterior myocardial infarction 3 years ago presents to the emergency department complaining of dizziness and near-syncope. His ECG shows a wide complex rhythm at a rate of 35 beats per minute. There is no AV association. Given his history, what is the most likely underlying etiology of this rhythm?

A patient with known structural heart disease develops sustained monomorphic ventricular tachycardia. Despite initial successful cardioversion, the ventricular tachycardia recurs shortly thereafter. Which of the following long-term management strategies would be MOST effective in preventing recurrent episodes of ventricular tachycardia in this patient?

What is the primary mechanism by which amiodarone is effective in treating ventricular tachycardia and ventricular fibrillation?

Which specific ECG characteristic distinguishes Torsades de Pointes from other forms of ventricular tachycardia?

Which electrolyte abnormality is MOST closely associated with the development of Torsades de Pointes?

Which of the following is the MOST accurate description of the QRS complex morphology in ventricular fibrillation?

Which of the following best describes the pathophysiology of a Bundle Branch Block (BBB) leading to a widened QRS complex?

A 55-year old male presents with symptomatic bradycardia. His ECG demonstrates complete heart block with a wide QRS escape rhythm at a rate of 30 bpm. What is the MOST appropriate treatment strategy?

A patient with a history of heart failure and preserved ejection fraction (HFpEF) develops a wide-complex tachycardia at a rate of 220 bpm. The QRS morphology varies from beat to beat. He is hypotensive and altered. Which of the following is most likely diagnosis?

Which condition inherently involves a block at the bundle branches, but is distinctly different from ventricular dysrhythmias?

In the presence of a Bundle Branch Block, if the rhythm is determined to be sinus, what can be said about the conduction between the atria and ventricles?

For a rhythm to be classified as Accelerated Idioventricular Rhythm (AIVR), what range does its rate typically fall within?

Which of the following rhythms is most associated with myocardial infarction and reperfusion after thrombolytic therapy?

What is the typical heart rate range observed in a patient experiencing Torsades de Pointes?

A patient is diagnosed with ventricular trigeminy. This indicates what pattern of PVCs?

Which of the following rhythms is characterized by complete absence of organized electrical activity, with no identifiable P waves, QRS complexes, or T waves?

What is the underlying mechanism by which ventricular dysrhythmias typically exhibit widened QRS complexes on an ECG?

Which of the following electrolyte imbalances is most frequently implicated as a contributing factor to the development of Torsades de Pointes?

In the context of pacemaker function, which of the following pacing configurations is MOST likely to result in a widened QRS complex?