Narrow QRS

A narrow QRS complex is less than 2.5 mm (100 msec) at standard settings. If the complex is narrow, it must have originated from somewhere above the ventricles (supraventricular). This is because it can only be narrow by travelling through the ventricles on the normal conduction highways.

Narrow complex rhythms can originate from the SA node, atria or the AV node / junction.

See also: QRS complex

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References

165 ECGs found. Sort by:
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In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea Bradycardia Irregular Normal Axis Absent P waves Hidden P waves Narrow QRS Short PR Change in rhythm Junctional escape Multiple rhythms Sinus arrhythmia Sinus bradycardia 12-Lead Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
What is the Rhythm?

This ECG is from a young man who presented shortly after a 45 min episode of palpitations, shortness of breath, chest pressure and presyncope. He was an athlete.

This ECG shows marked sinus bradycardia with AV dissociation by default (not AV block) with junctional escape beats.

In the ECGquest archives, this ECG has been tagged with: - Incorrect Machine Interpretation Inverted P waves Narrow QRS Retrograde P waves Short PR Accelerated junctional rhythm 12-Lead Dr Smith's ECG Blog CC BY-NC
What is going on here?? (The computer called it “STEMI” and “Intraventricular Conduction Delay”!!)
In the ECGquest archives, this ECG has been tagged with: - Palpitations Extreme tachycardia Normal Axis Regular Tachycardia Absent P waves Narrow QRS ST elevation in aVR Widespread ST depression SVT 12-Lead ECG of the Week CC-BY-NC-SA
ECG of the Week – 7th January 2019 – Interpretation

This ECG is from a woman in her 20s who presented with palpitations for an hour.

This ECG shows a regular narrow complex tachycardia (SVT) with secondary ST segment changes due to the extreme rate (205 bpm).

In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea Normal Axis Regular Tachycardia Anterior ST depression Inferior ST elevation Narrow QRS Normal P waves Reciprocal ST depression Sinus tachycardia Multi-vessel disease 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
Arrhythmia? Ischemia? Both? Electricity, drugs, lytics, cath lab? You decide. Repeat 1 min later.

This ECG is from a man in his 60s who presented with intermittent shortness of breath and chest pressure over the past few days. This was his repeat ECG after the rhythm changed.

This ECG shows a sinus tachycardia with ST elevation in inferior leads and ST depression in anterior leads and aVL. He underwent angiography and had stents inserted to the left circumflex and right coronary arteries.

In the ECGquest archives, this ECG has been tagged with: - Normal Axis Regular Narrow QRS Normal P waves Normal 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
Arrhythmia? Ischemia? Both? Electricity, drugs, lytics, cath lab? You decide. Baseline ECG.

This ECG is from a man in his 60s who presented with intermittent shortness of breath and chest pressure over the past few days. This was his baseline ECG for comparison.

This ECG shows a normal ECG.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea Extreme tachycardia Normal Axis Regular Tachycardia Absent P waves Anterior ST depression Inferior ST elevation Narrow QRS Reciprocal ST depression Atrial flutter Multi-vessel disease 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
Arrhythmia? Ischemia? Both? Electricity, drugs, lytics, cath lab? You decide.

This ECG is from a man in his 60s who presented with intermittent shortness of breath and chest pressure over the past few days. This was his initial ECG.

This ECG shows a regular narrow complex tachycardia around 200 bpm, without P waves, with marked ST elevation in inferior leads and ST depression in anterior leads and aVL. The cause was thought to be atrial flutter from newly started flecainide. He also underwent angiography and had stents inserted to the left circumflex and right coronary arteries.

In the ECGquest archives, this ECG has been tagged with: - Normal Axis Normal rate Narrow QRS Normal Q wave 12-Lead Dr Smith's ECG Blog CC BY-NC
Chest Pain and RBBB. What do you think?

This ECG is from an elderly woman who presented with 25 min of chest pain after working out. This was her baseline ECG.

In the ECGquest archives, this ECG has been tagged with: - Palpitations Normal Axis Regular Tachycardia Inferior ST depression Narrow QRS SVT 12-Lead ECG of the Week CC-BY-NC-SA
ECG of the Week – 8th October 2018 – Interpretation

This ECG is from a woman in her 50s who presented with palpitations for the last few hours. She had no known medical conditions and no regular medications.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Normal Axis Regular Tachycardia Anterior ST elevation Hyperacute T waves Inferior ST elevation Lateral ST elevation Narrow QRS Sinus tachycardia Acute Anterior MI Acute Inferior MI Acute Lateral MI 12-Lead ECG of the Week Dr John Larkin CC-BY-NC-SA
ECG of the Week – 20th August 2018 – Interpretation
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