QRS Duration Prolonged Causes & Reasons

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QRS Duration Prolonged Symptom Checker: Possible causes include Left Posterior Fascicular Block. Check the full list of possible causes and conditions now! Talk to our Chatbot to narrow down your search.

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Possible Causes

Left Posterior Fascicular Block

As in LAFB, the QRS duration will by prolonged by approximately 0.01 to 0.04 s, but total QRS duration will not reach 0.12 second. Refer to Figure 1. [ecgwaves.com]

duration normal or slightly prolonged (80-110ms) Prolonged R wave peak time in aVF Increased QRS voltage in the limb leads [maricopaemergencymedicine.com]

[…] complexes ‘) in leads II, III and aVF QRS duration normal or slightly prolonged (80-110ms) Prolonged R wave peak time in aVF Increased QRS voltage in the limb leads No evidence [lifeinthefastlane.com]

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Left Anterior Fascicular Block

As in LAFB, the QRS duration will by prolonged by approximately 0.01 to 0.04 s, but total QRS duration will not reach 0.12 second. Refer to Figure 1. [ecgwaves.com]

Here we can see that the QRS duration is prolonged at 110 ms (but under 120 ms). We also note qR complexes in leads I and aVL and rS complexes in leads II, III and aVF. [ems12lead.com]

I and aVL Small R waves with deep S waves ( ‘rS complexes’) in leads II, III, aVF QRS duration normal or slightly prolonged (80-110 ms) Prolonged R wave peak time in aVL [litfl.com]

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Bidirectional Tachycardia

This ECG has two distinct QRS morphologies alternating every other beat. The QRS complex duration is prolonged (wide). [healio.com]

Although the QRS duration during the arrhythmia was prolonged, it remained narrower than the patient’s intrinsic QRS with the LBBB. The arrhythmia spontaneously abated. [ahajournals.org]

One of the QRS complexes is upward concordant in the precordial leads (all upward) indicating a ventricular origin. [healio.com]

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Diffuse Intraventricular Block

Nonspecific intraventricular block 2017 Billable/Specific Code Disorder of the atrioventricular conduction system characterised by a prolonged QRS duration (QRS duration greater [medicbind.com]

Nonspecific intraventricular block 2017 Billable/Specific Code Disorder of the atrioventricular conduction system characterised by a prolonged QRS duration (QRS duration [codelay.com]

Associated ECG findings include decreased P wave amplitude, widened QRS duration, progressive PR prolongation and, in a terminal phase, a sinusoidal ECG pattern. [clinicaladvisor.com]

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Right Bundle Branch Block

We hypothesized that prolonged R' wave duration in lead V1 would extend the later portion of the QRS complex and can act as an indicator of reduced RV function in patients [ncbi.nlm.nih.gov]

Complete RBBB was found less often in control subjects (1.37%; P .0001), and the QRS duration was more prolonged in patients with IVF: 139 10ms vs 150 14ms (P .0061). [ncbi.nlm.nih.gov]

The QRS duration was more prolonged in patients with BS and CRBBB compared with age- and sex-matched controls: 170 13 versus 145 15 milliseconds in V1 and 144 19 versus 128 [ncbi.nlm.nih.gov]

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Heart Failure

prolonged QRS duration. [ncbi.nlm.nih.gov]

However, in the two-thirds of people without prolonged QRS duration, CRT may actually be harmful. [en.wikipedia.org]

Clinical studies have primarily focused on patients with normal QRS durations in view of the fact that cardiac resynchronization (CRT) is a viable option for patients with [ncbi.nlm.nih.gov]

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Congestive Heart Failure

prolonged QRS duration. [ncbi.nlm.nih.gov]

Remember that a LBBB and RBBB, by definition, prolong the QRS duration. [healio.com]

Clinical studies have primarily focused on patients with normal QRS durations in view of the fact that cardiac resynchronization (CRT) is a viable option for patients with [ncbi.nlm.nih.gov]

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Left Bundle Branch Block

The hallmark of LBBB is the prolonged QRS duration. A QRS duration of 120 ms (0.12 s) or more is required to diagnose a complete left bundle branch block. [ecgwaves.com]

CRT is a therapeutic option for patients with heart failure, sinus rhythm, prolonged QRS complex duration and reduced ejection fraction. [ncbi.nlm.nih.gov]

Patients with an LBBB according to Strauss showed a significantly more prolonged QRS duration (P CONCLUSIONS: Applying stricter criteria, only 37% of patients undergoing CRT [ncbi.nlm.nih.gov]

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Hyperkalemia

Cyclic Antidepressants Many drugs can prolong the QRS interval in overdose. [doi.org]

duration is 120 ms. 335 – 342 Current evidence neither supports nor refutes a role for lidocaine in the management of wide-complex tachycardia caused by cocaine. [doi.org]

[…] blockers involves administration of 1 mL/kg of sodium bicarbonate solution (8.4%, 1 mEq/mL) IV as a bolus, repeated as needed until hemodynamic stability is restored and QRS [doi.org]

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Cardiac Arrhythmia

Prolonged QRS duration on the resting ECG is associated with sudden death risk in coronary disease, independent of prolonged ventricular repolarization. [doi.org]

An increase in the AP duration is responsible for the prolongation of the QT interval. [doi.org]

However, the QRS-prolonging allele was associated with a reduction in risk, which was opposite to that predicted based on associations between QRS duration and SCD. [doi.org]

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Torsade-De-Pointes Syndrome with Short Coupling Interval

duration prolongation due to slow conduction and intraventricular dyssynchrony. [innovationsincrm.com]

[…] premature atrial or ventricular contractions, previously described elsewhere. 4 Right ventricular apical (RVA) pacing alters left ventricular electrical activation, causing QRS [innovationsincrm.com]

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Third Degree Atrioventricular Block

The HV interval increased (mean 43%) and the QRS duration was prolonged (mean 24%). [ncbi.nlm.nih.gov]

Otherwise this block has no other effect on the ECG. 1 Atrioventricular Block Rate: Unaffected Regularity: Unaffected P-Waves: Unaffected PR Interval: Prolonged, 0.2 s QRS [ems12lead.com]

[…] complex (delta wave) representing early ventricular activation through normal ventricular muscle in region of the accessory pathway Prolonged QRS duration (usually 0.10s) [ecg.utah.edu]

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Crack Ingestion

Many studies showed that these alterations can help identify patients with high risk of arrhythmia and seizure, mainly the prolongation of the QRS duration 100 ms. [hindawi.com]

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Left Cardiac Ventricle Disorder

Remember that a LBBB and RBBB, by definition, prolong the QRS duration. [healio.com]

Prolongation of QRS duration correlates well with progressive RV dilatation and dysfunction. [revespcardiol.org]

QRS duration) Left ventricular ejection fraction less than 35%, NYHA functional class I or II and undergoing pacemaker or implanted cardioverter defibrillator insertion, [healio.com]

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Low Cardiac Output Syndrome

QRS duration (QRSd; or 120 ms) is an independent predictor of low cardiac output syndrome (LCOS) in patients with low left ventricular (LV) ejection fraction (EF) who underwent [ncbi.nlm.nih.gov]

Remember that a LBBB and RBBB, by definition, prolong the QRS duration. [healio.com]

[…] information 1 Department of Cardiology, Başkent University Adana Teaching and Medical Research Center, Adana, Turkey. tacil@lycos.com Abstract This study determined whether prolonged [ncbi.nlm.nih.gov]

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Cardiomyopathy

duration and the paced AV delay.19 Patients should be considered for biventricular pacing if they have QRS duration greater than 150 ms, PR interval prolongation, and symptoms [heart.bmj.com]

[…] not confirmed by later studies, there has been a more consistent response in studies that have used biventricular pacing, the outcome depending critically on the native QRS [heart.bmj.com]

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Heart Block

Alternatively, if the PR interval is normal and the QRS duration is prolonged, then it is most likely second-degree AV nodal block type II, and a pacemaker is probably warranted [healio.com]

Although the PQ interval is prolonged, all P waves are followed by QRS complexes: there is no dropout of complexes In first degree AV block there is a prolongation of PQ duration [en.ecgpedia.org]

Otherwise this block has no other effect on the ECG. 1 Atrioventricular Block Rate: Unaffected Regularity: Unaffected P-Waves: Unaffected PR Interval: Prolonged, 0.2 s QRS [ems12lead.com]

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Supraventricular Tachycardia

120 ms) (Box 3), but may have a prolonged QRS interval ( 120 ms) when associated with pre-existing or rate-related bundle branch block. [mja.com.au]

This is the classical ECG appearance of Wolff–Parkinson–White (WPW) syndrome.12 If the arrhythmia is captured on an ECG it is usually a narrow-complex tachycardia (QRS duration [mja.com.au]

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Infectious Colitis

• ECG effects: Selective 5-HT 3 antagonists, including ondansetron, have been associated with a number of dose-dependent increases in ECG intervals (eg, PR, QRS duration [web.archive.org]

In general, these changes are not clinically relevant, however, when used in conjunction with other agents that prolong these intervals, arrhythmia may occur. [web.archive.org]

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Atrial Fibrillation

The presence of QRS abnormalities on ECG (prolonged QRS duration of 110 to 120 ms, notching or slurring of the QRS complex, or low anterior forces with small R waves in the [dx.doi.org]

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Hypertrophic Cardiomyopathy

duration 0.12 s R or R′ wave in lead V1 0.5 mV in amplitude and R:S ratio 1 ST-segment depression or T-wave flattening or inversion in 2 leads Prolongation of heart rate [doi.org]

[…] wave in lead V5 or V6 3 mV Abnormal Q waves 0.04 s in duration or 25% of the height of the ensuing R wave, or QS pattern in 2 leads Right or left bundle-branch block with QRS [doi.org]

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Cor Pulmonale

duration is typically normal, the hypertrophy not being sufficient to cause a prolongation of the QRS; the onset of a complete right bundle branch block (QRS 120 ms) is rare [cardiocases.com]

[…] negative in aVL; the QRS-complexes frequently present abnormalities that can be related to the causal lung disease (emphysema) and/or the right ventricular hypertrophy; QRS [cardiocases.com]

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Micturition Syncope

duration 0.12 second) Mobitz type I second-degree atrioventricular block Asymptomatic sinus bradycardia ( 50 beats per minute) or sinoatrial block Preexcited QRS complexes [aafp.org]

Prolonged QT interval Right bundle branch block pattern with ST elevation in leads V 1 to V 3 (Brugada syndrome) Negative T waves in right precordial leads, epsilon waves [aafp.org]

[…] as left bundle branch block or right bundle branch block combined with left anterior or left posterior fascicular block) Other intraventricular conduction abnormalities (QRS [aafp.org]

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Syncope

duration 0.12 s) • Mobitz I second degree atrioventricular block • Asymptomatic sinus bradycardia ( • Pre‐excited QRS complexes • Prolonged QT interval • Right bundle branch [ncbi.nlm.nih.gov]

duration 0.12 second) Mobitz type I second-degree atrioventricular block Asymptomatic sinus bradycardia ( 50 beats per minute) or sinoatrial block Preexcited QRS complexes [aafp.org]

[…] left bundle branch block or right bundle branch block combined with left anterior or left posterior fascicular block) • Other intraventricular conduction abnormalities (QRS [ncbi.nlm.nih.gov]

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Preexcitation Syndrome

The classic electrocardiogram in Wolff-Parkinson-White (WPW) syndrome is characterized by a short PR interval and prolonged QRS duration in the presence of sinus rhythm with [ncbi.nlm.nih.gov]

[…] complex, but the similarity lies in the fact that the initial direction of QRS deflection is reversed and the total QRS duration is also prolonged. [frca.co.uk]

Right bundle branch block should not be diagnosed in the absence of prolonged QRS duration. [web.archive.org]

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Diabetic Autonomic Neuropathy

No patient showed prolongation of QRS complexes. [em-consulte.com]

QT intervals, defined as the duration from the first rising point of the Q wave to the terminal point of the T wave, were measured in three suitable consecutive beats in lead [em-consulte.com]

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Lenegre Disease

[…] occurs at 20-30 bpm QRS duration prolonged Does not  with atropine Site of block distal to AV node That is a distal block Mandates a pacemaker 2007-06-11 31. [slideshare.net]

QRS duration, prolonged His-ventricle conduction time, and ventricular escape rhythms. [findzebra.com]

Patients with prolonged QRS duration, even without bundle branch block, are at increased risk for future pacemaker implantation and may warrant monitoring for progressive [thoracickey.com]

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Paroxysmal Nodal Tachycardia

The delta wave prolongs QRS duration to 0.12 second, although the overall configuration, apart from the delta wave, may appear normal. [msdmanuals.com]

The following figure shows QRS complexes having an abnormal shape and prolonged duration because ventricular depolarization is not following normal conduction pathways. [cvphysiology.com]

Box 3 ), but may have a prolonged QRS interval ( 120 ms) when associated with pre-existing or rate-related bundle branch block. [mja.com.au]

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Incessant Infant Ventricular Tachycardia

Prolongation of QRS duration. Prolongation of PR interval. Disappearance of P waves. Wide bizarre biphasic QRS complexes (sine waves). Eventual asystole. [lifeinthefastlane.com]

A short PR interval of 50 ms was seen as well as a delta wave resulting in a prolonged QRS duration of 110 ms (Figure 1). [hindawi.com]

The QRS duration is not prolonged in this case, but due to the non-reactivity and low rate, this fetus will require pacing after birth. Fig. 10. [glowm.com]

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Temporal Lobe Epilepsy

QRS duration. [ecgwaves.com]

If the QRS duration is prolonged ( 0.12 seconds), the arrhtythmia is a wide complex tachycardia (WCT). [ecgwaves.com]

Hyperkalemia och class I antiarrhythmics: both may prolong the QRS duration. Read more in Beta-blockers and Antiarrhythmic Drugs. [ecgwaves.com]

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