Insight Medical Imaging offers walk-in ECG services at most of our Edmonton, Leduc, Spruce Grove & Sherwood Park clinics in Alberta. Call 1-866-771-9446.
A detailed view of the QRS complex (Q-wave, R-wave and S-wave) with emphasis on normal findings, amplitudes, durations / intervals, pathology.
An important rhythm distinction between ventricular (VT) or supraventricular (SVT with aberrancy) this will influence your patient management
Atrial Fibrillation (AF) is a common issue which doesn’t directly impact the way our heart beats. AF shakes up the average heartbeat…
Learn about T-wave abnormalities in ischemia. Hyperacute T-waves, T-wave inversions, flat T-waves, de Winters sign and Wellens sign are discussed.
There are few things in ECG interpretation more irritating to a junior learner than fascicular blocks. You might find yourself asking whether the pattern is qR. Or maybe it’s rO. sO? ss? And what are these fascicle things anyway? (Figure 1) In this article, we will briefly explore the physiology of cardiac depolarization, with and without fascicular
Atrial Fibrillation (AF) is a common issue which doesn’t directly impact the way our heart beats. AF shakes up the average heartbeat…
Wolff-Parkinson-White (WPW) Syndrome is a combination of the presence of a congenital accessory pathway and episodes of tachyarrhythmias
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Wolff-Parkinson-White (WPW) Syndrome is a combination of the presence of a congenital accessory pathway and episodes of tachyarrhythmias
The human body is a mysterious machine. Most of the time, human babies develop according to plan, but sometimes, something goes weirdly wrong and the result is a curious medical anomaly.
Comprehensive tutorial on ECG interpretation, covering normal waves, durations, intervals, rhythm and abnormal findings. From basic to advanced ECG reading. Includes a complete e-book, video lectures, clinical management, guidelines and much more.
Rhythm Recognition Knowing how to read and interpret ECGs is a critically important skill in ACLS and PALS. Take a moment to review the most common cardiac rhythms encountered in ACLS and PALS. The Prototypical ECG Tracing The P wave corresponds to electrical impulse traveling through the atria. This is synonymous with atrial depolarization and […]
An ECG is a series of waves and deflections recording the heart’s electrical activity from a certain “view.” With pictures included. Tweet
A woman in her 60s with a broad complex tachycardia. There are two ECG features that suggest an accessory pathway, can you spot them?
The heart’s electrical activity is represented on the monitor or ECG tracing by three basic waveforms: the P wave, the QRS complex, and the T wave. A U wave is sometimes present. Between the waveforms are the following segments and intervals: the PR interval, the ST segment, and the QT interval. Although the letters themselves have no special significance, each component represents a particular event in the depolarization–repolarization cycle. Calculating the Heart Rate There are several methods for determining heart rate. Our first method is simple. Count the number of QRS complexes over a 6 second interval. Multiply by 10 to determine heart rate. This method works well for both regular and irregular rhythms. In the first image, we can count 5 QRS complexes, so the heart rate is 50. The second method uses small boxes. Count the number of small boxes for a typical R-R interval. Divide this number into 1500 to determine heart rate. ECG tracings are recorded on grid paper. The horizontal axis of the ECG paper records time, with black marks at the top indicating 3 second intervals. Each second is marked by 5 large grid blocks. Thus each large block equals 0.2 second. The vertical axis records EKG amplitude (voltage). Two large blocks equal 1 millivolt (mV). Each small block equals 0.1 mV. Within the large blocks are 5 small blocks, each representing 0.04 seconds.
Learn about T-wave abnormalities in ischemia. Hyperacute T-waves, T-wave inversions, flat T-waves, de Winters sign and Wellens sign are discussed.
Learn about left bundle branch block (LBBB), with emphasis on ECG criteria, differential diagnoses, causes, management and diagnosis of ischemia/infarction.
Learn the ECG changes associated with electrolyte imbalance (electrolyte disorders), with emphasis on potassium, magnesium and calcium. Includes a complete e-book, video lectures, clinical management, guidelines and much more.
ECG features and causes of left axis deviation (LAD) using the hexaxial reference system. QRS axis between -30 and -90 degrees
Dextrocardia, (from Latin dexter, meaning "right," and Greek Kardia, meaning "heart") refers to a condition in which the heart is...
We present six patients with poor R-wave progression on their ECG, and the LATE mnemonic to work through the differential on ECG Cases on Emergency Medicine Cases
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ContentsThe BasicsECG paperFive large squares represent 1 secondECG Segments and IntervalsSegmentIntervalPracticalitiesCalibrating the machineTaking a readingPlacing your electrodesLeadsBipolar limb leadsAugmented Unipolar Limb leadsUnipolar chest leadsGraph ProductionQRS in the V leadsRelated Articles This article “Understanding ECGs” is part of the almostadoctor ECG series. It provides a basic introduction to ECG waveform, and the practicalities of performing an ECG. […]
Marked QT Prolongation secondary to toxic ingestion...
