ECG Quest > Shapes > QT interval > Long QT

Long QT

A long QT interval is more than 440 msec in men, or more than 460 msec in women. If it is more than 500 msec, there is an increase risk of Torsades de pointes.

Causes of QT prolongation include medications, electrolyte disturbances and ischemia.

In overdose, the risk of arrhythmia (Torsades de pointes) is more closely related to the absolute than corrected QT. This is plotted on the QT normogram along with the heart rate and if the result is above the line there is a risk of Torsades.

See also: QT interval

Can you add to the information on this page?

This ECG Archive is an academic, non-commercial #FOAMed project aiming to crowdsource a free open access database of ECGs and signs. If you include your personal details such as your name you will be attributed for your contribution, unless you tell us that you don't want this to happen. Personal contact details such as email addresses will not be published but may be used to email you in reply. Full project details and participant information available here.
56 ECGs found. Sort by:
TitleDate
ASCDESC
Show:
31030
per page.
Columns: per page.
In the ECGquest archives, this ECG has been tagged with: - Long QT Hypokalemia 12-Lead Dr Smith's ECG Blog CC BY-NC
Potassium and Magnesium: how low is too low?

This ECG is from a woman in her 30s who presented with vomiting, diarrhoea and cough for 2-3 days.

This ECG shows long QTc due to hypokalemia. She was found unresponsive in VF shortly after and required defibrillation.

In the ECGquest archives, this ECG has been tagged with: - Vomiting Weakness Long QT Hypocalcaemia 12-Lead Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
A Pathognomonic ECG. What is it?

This ECG is from a patient of unknown age who presented with weakness, decreased urine output and vomiting.

This ECG shows long QT due to a long ST segment without altering the T wave, caused by hypocalcemia.

In the ECGquest archives, this ECG has been tagged with: - Long QT ST elevation in aVR Tall U waves Widespread ST depression Hypokalemia 12-Lead Dr Smith's ECG Blog CC BY-NC
Diffuse ST depression, and ST elevation in aVR. Left main, right?

This ECG is from a middle aged male who presented with diffuse pain on a background of sickle cell disease.

This ECG shows LVH, diffuse ST depression with ST elevation in aVR and apparrent prolonged QTc due to U waves. The cause was hypokalemia (2.6).

In the ECGquest archives, this ECG has been tagged with: - Long PR Long QT Wide QRS Hyperkalemia Hypocalcaemia 12-Lead ECG of the Week CC-BY-NC-SA
ECG of the Week – 31st December 2018 – Interpretation

This ECG is from a woman in her 30s who presented with cramping following thyroid surgery.

This ECG shows prolonged QT due to long ST segment, no U waves, but also a prolonged QRS and PR. There was hypocalcemia, mild hyperkalemia and hypermagnesemia.

In the ECGquest archives, this ECG has been tagged with: - Loss of consciousness Long QT Peaked T waves Hyperkalemia Hypocalcaemia 12-Lead Dr Smith's ECG Blog CC BY-NC
Found comatose with prehospital ECG showing “bigeminal PVCs” and “Tachycardia at a rate of 156”

This ECG is from a patient with a history of diabetes who was found with a GCS of 4.

This ECG shows sinus rhythm with peaked T waves that were so narrow they were mistaken for separate QRS complexes. The cause was hyperkalemia due to acute renal failure.

In the ECGquest archives, this ECG has been tagged with: - Weakness Long QT T-U waves Tall U waves Hypokalemia 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog CC BY-NC
A young man with back spasms

This ECG is from a young man who presented with weakness and back pain on a background of an eating disorder and chronic kidney disease.

In the ECGquest archives, this ECG has been tagged with: - Regular Tachycardia Long QT Short QRS Sinus tachycardia Pericardial effusion 12-Lead Serial 12-lead Dr Smith's ECG Blog CC BY-NC
A Middle-Aged Man with Chest pain, Hypotension and Tachycardia: Next day, after ibutilide

This ECG is from a middle-aged man who presented with chest pain, tachycardia 130 bpm and BP 50/30. He was alert but cool and clammy. His background was unclear, but he mentioned chronic dyspnoea, 'cancer' and 'chest'. Fluids were started. This ECG was recorded the next day, after the arrhythmia recurred and was treated with ibutilide.

In the ECGquest archives, this ECG has been tagged with: - Weakness Long QT Tall U waves Hypokalemia 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
A pathognomonic ECG you should recognize instantly

This ECG is from a patient of unknown age who presented with generalised weakness and malaise.

In the ECGquest archives, this ECG has been tagged with: - Cardiac arrest Anterior ST elevation Long QT R in aVR 12-Lead Dr Smith's ECG Blog Dr Ken Grauer CC BY-NC
Bupropion Overdose Followed by Cardiac Arrest and, Later, ST Elevation. Is it STEMI? Repeat ECG the next day

This ECG is from a young woman who presented with status epilepticus seizures and an apparent overdose of bupropion, with possible cocaine ingestion. She was intubated and given propofol and benzodiazepines, which terminated the seizures, and then a PEA arrest was terminated with epinephrine and bicarbonate. This was the repeat ECG the next day.

1 2 3 4 6