Standard Calibration

Most ECGs are recorded at standard settings of 25 mm/sec paper speed and 10mm = 1 mV. At these standard settings, the rectangular calibration signal at the start of the trace should be 5 small squares wide and 10 small squares high. If the calibration signal is not this size, the ECG may have been recorded at non-standard settings and all of the usual rules for calculating rate, segments, intervals and heights may not apply.

See also: Rate

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References

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In the ECGquest archives, this ECG has been tagged with: - Normal Axis Standard Calibration Inverted T waves 12-Lead Dr Smith's ECG Blog CC BY-NC
A female in her 60s who was lucky to get expert ECG interpretation

This ECG is from a female in her 60s presented with chest pressure for 1 hour. She had a history of hypertension and smoking. She described the pain as a "buffalo sitting on my chest". She also described a "weird" sensation in her jaw for 1 hour prior to arrival, associated with lightheadedness and diaphoresis.

In the ECGquest archives, this ECG has been tagged with: - Dizziness Palpitations Normal Axis Standard Calibration Delta wave Normal P waves Short PR Wide QRS Wolff Parkinson White syndrome 12-Lead ECG of the Week Dr John Larkin CC-BY-NC-SA
ECG of the Week – 12th February 2018 – Interpretation

This ECG is from a 12 yr old male who presented to the Emergency Department following an episode of palpitations and near-syncope. He had no known past medical history.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Standard Calibration Concordant ST elevation Normal Sinus Rhythm LBBB Acute Inferior MI Acute Lateral MI 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog CC BY-NC
Is there Wellens’ syndrome in left bundle branch block? Or in inferior and lateral leads?

This ECG is from a man in his 80s who presented with acute chest pain.

This ECG shows LBBB with concordant STE in II, V5 and V6 due to inferior and lateral MI.

In the ECGquest archives, this ECG has been tagged with: - Syncope Standard Calibration Short PR Junctional Rhythms 12-Lead Dr Smith's ECG Blog CC BY-NC
Syncope and Prehospital Cath Lab Activation for Posterior STEMI
In the ECGquest archives, this ECG has been tagged with: - Normal Axis Standard Calibration PR segment depression Widespread ST elevation Pericarditis 12-Lead Dr Smith's ECG Blog CC BY-NC
ST Elevation after Stab Wound to the Heart

This ECG is from a young man presented after a stab wound to the chest. Rapid ED diagnosis of cardiac penetrating trauma was made by ED ultrasound, and the patient went to the OR and had a wound to the right atrium repaired.  There was no laceration of any coronary vessel.  He did well.  This ECG was recorded at day 3 because of tachycardia.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Normal Axis Normal rate Regular Standard Calibration Inverted T waves Narrow QRS Normal P waves Normal ST segment Acute Posterior MI 12-Lead Dr Smith's ECG Blog CC BY-NC
Chest pain and a non-diagnostic ECG. No worries, right?

This ECG is from a middle aged man presented with chest pain. This is the first prehospital ECG that was recorded.

In the ECGquest archives, this ECG has been tagged with: - Chest pain Normal Axis Regular Standard Calibration Anterior ST depression Inferior ST elevation Reciprocal ST depression Normal Sinus Rhythm Acute Inferior MI Acute Posterior MI 12-Lead Dr Pendell Meyers Dr Smith's ECG Blog CC BY-NC
This ECG was shown to the doctor with no clinical information

This ECG is from a man in his 40s presented with chest pain that woke him from sleep. He had similar chest pain last night which subsided, and he was able to go to sleep only to be awoken several hours later by recurrent pain. He had a history of hypertension.

In the ECGquest archives, this ECG has been tagged with: - Diarrhoea Normal Axis Normal rate Regular Standard Calibration Inferior ST depression Lateral ST depression Long QT Narrow QRS Normal PR Normal Sinus Rhythm Hypocalcaemia Hypomagnesaemia 12-Lead ECG of the Week Dr John Larkin CC-BY-NC-SA
ECG of the Week – 29th January 2018 – Interpretation

This ECG is from a man in his 60s presented with several weeks of diarrhoeal illness following overseas travel. He had a past medical history of ischaemic cardiomyopathy. His medications included warfarin, a beta-blocker, a PPI, an ACE inhibitor and diuretics.