Health Education Assets Library (HEAL)
 
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TitleDescriptionSubjectCollection
26 Acute anterior MIAcute anterior MIKnowledge Weavers ECG
27 Acute infero-postero-lateral MIHyperacute ST segment elevation is seen in leads II, III, aVF (inferior location) and in leads V4-6 (apical lateral wall location). Hyperacute ST depression is seen in leads V1-2 (an expression of posterior wall injury). in addition there are reciprocal ST segment depression changes in leads I an...Knowledge Weavers ECG
28 Acute inferoposterior MIAcute inferoposterior MIKnowledge Weavers ECG
29 Acute postero-lateral MI: precordial leadsAcute postero-lateral MI: precordial leadsKnowledge Weavers ECG
30 Acylation of carnitine by a long chain fatty acyl CoALong chain fatty acyl CoA cannot cross the inner mitochondrial membrane to participate in beta-oxidation. The fatty acyl group is therefore transferred to a carrier, carnitine, in a reversible reaction catalyzed by carnitine acyl transferase I. The resulting fatty acyl carnitine crosses the membra...Knowledge Weavers Fatty Acids
31 All about premature beatsAll about premature beatsKnowledge Weavers ECG
32 An interpolated PACAlthough most PACs reset the sinus node producing an incomplete compensatory pause, this PAC, indicated by the black arrow, is interpolated, i.e., sandwiched between two sinus beats. Note that the subsequent sinus P wave conducts with prolonged PR interval due to the relative refractoriness of the...Knowledge Weavers ECG
33 Anteroseptal MI with RBBB: precordial leadsAnteroseptal MI with RBBB: precordial leadsKnowledge Weavers ECG
34 Anteroseptal MI, fully evolved: precordial leadsAnteroseptal MI, fully evolved: precordial leadsKnowledge Weavers ECG
35 Anteroseptal MI: fully evolvedThe QS complexes, resolving ST segment elevation and T wave inversions in V1-2 are evidence for a fully evolved anteroseptal MI. The inverted T waves in V3-5, I, aVL are also probably related to the MI.Knowledge Weavers ECG
36 Atrial bigeminy - marquetteAtrial bigeminy - marquetteKnowledge Weavers ECG
37 Atrial echosIn this example a typical Wenckebach sequence is interrupted by what looks like a PAC - indicated by red arrows. Atrial echos are more likely, however, because the preceding beat has a long PR interval, a condition that facilitates reentry and echo formation.Knowledge Weavers ECG
38 Atrial fibrillation with moderate ventricular response - MarquetteAtrial fibrillation with moderate ventricular response - MarquetteKnowledge Weavers ECG
39 Atrial flutter with 2:1 AV conductionIn this example of atrial flutter with 2:1 AV conduction the flutter waves are very hard to see. Atrial flutter with 2:1 block must be considered, however, because the heart rate is about 150 bpm. A careful look at V1 shows the two flutter waves for each QRS complex complex. One flutter wave imme...Knowledge Weavers ECG
40 Atrial flutter with 2:1 AV conductionFlutter waves are best seen in lead V1; one immediately follows the QRS and the other precedes the next QRS. The regular ventricular rate of 150 bpm should always prompt us to condider this diagnosis.Knowledge Weavers ECG
41 Atrial flutter with 2:1 AV conductionAtrial flutter with 2:1 AV block is one of the most frequently missed ECG rhythm diagnoses because the flutter waves are often hard to find. In this example two flutter waves for each QRS are best seen in lead III and V1. The ventricular rate at 150 bpm should always prompt us to consider atrial fl...Knowledge Weavers ECG
42 Atrial flutter with 2:1 AV conduction: lead V1The arrows point to two flutter waves for each QRS complex. Atrial rate = 280; ventricular rate = 140.Knowledge Weavers ECG
43 Atrial flutter with 2:1 AV conduction: leads II, III, V1In leads II and III, the one of the flutter waves occurs at the end of the QRS complex and might be mistaken for part of the QRS itself; i.e., the S wave. In lead V1, the two flutter waves for every QRS are more easily identified.Knowledge Weavers ECG
44 Atrial flutter with 2:1 and 4:1 conduction and rate dependent LBBBIn this example of atrial flutter with variable AV conduction, the faster rates are associated with rate-related LBBB. Don't confuse this for ventricular tachycardia.Knowledge Weavers ECG
45 Atrial flutter with 2:1 conduction: leads II, III, V1Atrial flutter with 2:1 conduction: leads II, III, V1Knowledge Weavers ECG
46 Atrial flutter with 3:2 AV conductionThis 12-lead ECG shows a subtle bigeminal rhythm resulting from atrial flutter with a 3:2 AV conduction ratio; RR intervals alternate by a small duration. This is uncommon! The impulses from the atrial flutter conduct through the AV junction in a Wenckebach sequence; for every 3 flutter waves the s...Knowledge Weavers ECG
47 Atrial flutter with 3:2 conduction ratio: frontal plane leadsNote the subtle bigeminy in the RR intervals. The best way to identify the flutter waves in this example is to imagine what lead III would look like if the QRS complexs disappeared; what remains is a reasonable saw-tooth pattern characteristic of atrial flutter with a flutter rate of about 300 bpm...Knowledge Weavers ECG
48 Atrial flutter with variable AV block - marquetteAtrial flutter with variable AV block - marquetteKnowledge Weavers ECG
49 Atrial flutter with variable AV block and rate-dependent LBBBThe basic rhythm is atrial flutter with variable AV block. When 2:1 conduction ratios occur there is a rate-dependent LBBB. Don't be fooled by the wide QRS tachycardia on the bottom strip. It's not ventricular tachycardia, but atrial flutter with 2:1 conduction and LBBB. Lidocaine is not needed ...Knowledge Weavers ECG
50 Atrial parasystoleParasystolic rhythms involve an independent ectopic pacemaker resulting in nonfixed coupled premature beats. Parasystole may occur in the atria, as seen in this example, in the AV junction, and in the ventricles. Note the common inter-ectopic interval separating the parasystolic PAC's.Knowledge Weavers ECG
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