Narrow QRS

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.

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In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea 12-Lead Irregular Narrow QRS Tachycardia Tall QRS Widespread ST depression Atrial fibrillation ECG Interpretation CC-BY-NC-SA
ECG Blog #166 (ST-T – AFib – LVH – SVT)

This ECG is from a woman in her 60s who presented in acute heart failure with dyspnoea and intermittent chest discomfort.

This ECG shows atrial fibrillation, LVH and diffuse ST-T changes.

In the ECGquest archives, this ECG has been tagged with: - Loss of consciousness Seizure 12-Lead Irregular Narrow QRS Wide QRS Atrial fibrillation Change in rhythm Dr Smith's ECG Blog CC BY-NC
What is this tachycardia that alternates from wide to narrow to wide?

This ECG is from a patient in their 50s who presented unconscious and tachycardic after a seizure.

This ECG shows alternating wide and narrow complex tachycardias at the same rate, likely due to aberrancy.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea 12-Lead Absent P waves Bradycardia Hidden P waves Irregular Narrow QRS Normal Axis Short PR Change in rhythm Junctional escape Multiple rhythms Sinus arrhythmia Sinus bradycardia Dr Smith's ECG Blog 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: - 12-Lead Incorrect Machine Interpretation Inverted P waves Narrow QRS Retrograde P waves Short PR Accelerated junctional rhythm 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 12-Lead Absent P waves Extreme tachycardia Narrow QRS Normal Axis Regular ST elevation in aVR Tachycardia Widespread ST depression SVT 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 12-Lead Bradycardia Changing PR interval Narrow QRS Normal P waves Short PR Junctional escape Sinus arrhythmia Sinus bradycardia ECG Interpretation CC-BY-NC-SA
ECG Blog #159 (Bradycardia – AV Block – AV Dissociation – Junctional)
In the ECGquest archives, this ECG has been tagged with: - Chest pain Dyspnoea 12-Lead Absent P waves Anterior ST depression Extreme tachycardia Inferior ST elevation Narrow QRS Normal Axis Reciprocal ST depression Regular Tachycardia Atrial flutter Multi-vessel disease Dr Smith's ECG Blog 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: - Chest pain Dyspnoea 12-Lead Anterior ST depression Inferior ST elevation Narrow QRS Normal Axis Normal P waves Reciprocal ST depression Regular Tachycardia Sinus tachycardia Multi-vessel disease Dr Smith's ECG Blog 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: - 12-Lead Narrow QRS Normal Axis Normal P waves Normal R wave transition Regular Normal Dr Smith's ECG Blog 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: - 12-Lead Narrow QRS Normal Axis Normal Q wave Normal rate 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 12-Lead Inferior ST depression Narrow QRS Normal Axis Regular Tachycardia SVT 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 12-Lead Anterior ST elevation Hyperacute T waves Inferior ST elevation Lateral ST elevation Narrow QRS Normal Axis Regular Tachycardia Sinus tachycardia Acute Anterior MI Acute Inferior MI Acute Lateral MI ECG of the Week CC-BY-NC-SA
ECG of the Week – 20th August 2018 – Interpretation

This ECG is from a man in his 70s who presented with chest pain for the last 90 minutes, on a background of type 2 diabetes and hypertension.

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