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.

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ECG Library (15)

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In the ECGquest archives, this ECG has been tagged with: - 12-Lead Standard Calibration Inverted T waves Normal Axis Dr Smith's ECG Blog CC BY-NC
A female in her 60s who was lucky to get expert ECG interpretation 18002

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 12-Lead Standard Calibration Delta wave Normal Axis Normal P waves Short PR Wide QRS Wolff Parkinson White syndrome ECG of the Week CC-BY-NC-SA
ECG of the Week – 12th February 2018 – Interpretation 17974

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 12-Lead Standard Calibration Concordant ST elevation Normal Sinus Rhythm LBBB Acute Inferior MI Acute Lateral MI Dr Smith's ECG Blog CC BY-NC
Is there Wellens’ syndrome in left bundle branch block? Or in inferior and lateral leads? 17979

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 12-Lead Standard Calibration Short PR Junctional Rhythms Dr Smith's ECG Blog CC BY-NC
Syncope and Prehospital Cath Lab Activation for Posterior STEMI 17927
In the ECGquest archives, this ECG has been tagged with: - 12-Lead Standard Calibration Normal Axis PR segment depression Widespread ST elevation Pericarditis Dr Smith's ECG Blog CC BY-NC
ST Elevation after Stab Wound to the Heart 17890

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 12-Lead Standard Calibration Inverted T waves Narrow QRS Normal Axis Normal P waves Normal rate Normal ST segment Regular Acute Posterior MI Dr Smith's ECG Blog CC BY-NC
Chest pain and a non-diagnostic ECG. No worries, right? 17867

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 12-Lead Standard Calibration Anterior ST depression Inferior ST elevation Normal Axis Reciprocal ST depression Regular Normal Sinus Rhythm Acute Inferior MI Acute Posterior MI Dr Smith's ECG Blog CC BY-NC
This ECG was shown to the doctor with no clinical information 17741

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 12-Lead Standard Calibration Inferior ST depression Lateral ST depression Long QT Narrow QRS Normal Axis Normal PR Normal rate Regular Normal Sinus Rhythm Hypocalcaemia Hypomagnesaemia ECG of the Week CC-BY-NC-SA
ECG of the Week – 29th January 2018 – Interpretation 17731

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.

In the ECGquest archives, this ECG has been tagged with: - Chest pain 12-Lead Standard Calibration Inverted T waves Lateral ST elevation Acute Inferior MI Acute Posterior MI Dr Smith's ECG Blog CC BY-NC
Is this ECG diagnostic of coronary occlusion? Also: Inferior de Winter’s T-waves on prehospital ECG?? 17679
In the ECGquest archives, this ECG has been tagged with: - 12-Lead Serial 12-lead Standard Calibration Lateral ST elevation Acute Inferior MI Acute Posterior MI Dr Smith's ECG Blog CC BY-NC
Is this ECG diagnostic of coronary occlusion? Also: Inferior de Winter’s T-waves on prehospital ECG?? Post cath 17698