What causes widening of the QRS complex?

Causes of a widened QRS complex include right or left BBB, pacemaker, hyperkalemia, ventricular preexcitation as is seen in Wolf-Parkinson-White pattern, and a ventricular rhythm. Because there is a P wave associated with every QRS complex, a ventricular rhythm can be ruled out.

Is wide QRS tachycardia normal?

A normal QRS should be less than 0.12 seconds (120 milliseconds), therefore a wide QRS will be greater than or equal to 0.12 seconds. To put it all together, a WCT is considered a cardiac dysrhythmia that is > 100 beats per minute, wide QRS (> 0.12 seconds), and can have either a regular or irregular rhythm.

What are 2 common cause of wide complex tachycardia?

If a wide-complex tachycardia is monomorphic, its origin can be ventricular tachycardia in a structurally abnormal heart, most commonly scar re-entry in coronary artery disease or cardiomyopathies such as hypertrophic or dilated cardiomyopathy, or arrhythmogenic right ventricular cardiomyopathy (table 2).

What does a widened QRS interval indicate?

Kardia Advanced Determination “Sinus Rhythm with Wide QRS” indicates sinus rhythm with a QRS, or portion of your ECG, that is longer than expected. This could indicate a bundle branch block in which there is a delay in the passage of heart’s electrical signals along the bottom of the heart.

Which arrhythmias have wide QRS?

Wide QRS complex tachycardia can be originated by 3 main mechanisms1:

  • Ventricular tachycardia (VT).
  • Supraventricular tachycardia (SVT) with an aberrant conduction attributable to a preexisting bundle-branch block or functional bundle-branch block induced by the fast heart rate.

Which tachycardia rhythms have a wide QRS complex?

Wide QRS complex tachycardia can be originated by 3 main mechanisms1: Ventricular tachycardia (VT). Supraventricular tachycardia (SVT) with an aberrant conduction attributable to a preexisting bundle-branch block or functional bundle-branch block induced by the fast heart rate.

What drugs should be avoided with wide complex tachycardia?

It is so very critical to choose the right kind of medication once the decision is made to treat a patient with wide complex tachycardia. Calcium channel blockers (Diltiazem and verapamil) are strongly advised not to be used for fear of hemodynamic collapse, hypotension and cardiac arrest [4].

What do you give for wide complex tachycardia?

Although procainamide, lidocaine and sotalol are proven to be effective and even preferred by some clinicians, amiodarone (Class III antiarrhythmic with potassium, calcium, and sodium channel blocking properties) remains the primary antiarrhythmic agent in the prehospital setting for wide complex tachycardia.

Is wide complex tachycardia SVT?

Can SVT have a wide QRS?

SVT with widening of the QRS interval induced by drugs or electrolyte disturbances. Class IC and IA drugs cause use-dependent slowing of conduction and class III drugs prolong refractoriness to a greater extent at the His–Purkinje tissue than in the ventricular myocardium.

What is considered wide QRS?

– Wide QRS may indicate: – Ventricular contractions – Bundle branch block – Pre-excitation (Wolff-Parkinson White syndrome)

What causes a widened QRS complex?

Sodium channel blockade

  • Hyperkalemia
  • Hyper- or hypo-magnesemia
  • Supraventricular tachycardia (SVT) with pre-existing or a rate-related bundle branch block (BBB)
  • SVT with aberrant conduction
  • Atrial fibrillation (Afib) with Wolff-Parkinson-White syndrome (WPWS)
  • Mono-morphic ventricular tachycardia (VT)
  • Ventricular fibrillation (VFib)

    • What are the symptoms of wide complex tachycardia?

    Tachycardia (tachyarrhythmia): causes,differential diagnoses,treatment and management.

  • Tachycardia: the value of anamnesis.
  • ECG in tachycardia.
  • Narrow complex tachycardia (NCT) Narrow QRS complexes,defined as QRS duration <0.12 seconds,can only be achieved if the ventricles are depolarized via the His-Purkinje system; this allows the impulse

    • What is the treatment for wide complex tachycardia?

    Attempt vagal maneuvers

  • If unsuccessful,administer adenosine 6 mg IV bolus followed by a rapid normal saline flush
  • If unsuccessful,administer adenosine 12 mg IV bolus followed by a rapid normal saline flush
  • Beta-blockers and calcium channel blockers may be considered for narrow QRS tachycardia (QRS <0.12 sec)