Health Education Assets Library (HEAL)
 
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TitleDescriptionSubjectCollection
51 Atrial parasystoleIn atrial parasystole non-fixed coupled PACs, shown by arrows, occur at a common inter-ectopic interval or at multiples of this interval. Atrial fusions, not shown here, may also occur when the PAC occurs in close temporal proximity to the sinus impulse.Knowledge Weavers ECG
52 Atrial parasystoleThe evenly spaced dots indicate ectopic atrial activity from a parasystolic atrial pacemaker. Non-fixed coupled PACs are seen having a common inter-ectopic interval. One of the PACs is nonconducted.Knowledge Weavers ECG
53 Atrial tachycardia - marquetteAtrial tachycardia - marquetteKnowledge Weavers ECG
54 Atrial tachycardia with 2:1 AV block: a manifestation of digitalis intoxicationAtrial tachycardia with 2:1 AV block: a manifestation of digitalis intoxicationKnowledge Weavers ECG
55 Atrial tachycardia with 3:2 AV blockIn this rhythm the atrial rate from an ectopic focus is 160 bpm. Atrial activity can be seen on top of T waves, and before QRS's. Careful observation reveals a 3:2 Wenckebach relationship between P waves and QRS's. Atrial tachycardia with block is often a sign of digitalis intoxication.Knowledge Weavers ECG
56 Atrial tachycardia with 3:2 and 2:1 AV blockThe ectopic atrial rate is 150 bpm. Some of the ectopic P waves are easily seen and indicated by the arrows. Other P waves are burried in the T waves and not so easily identified. Atrial tachycardia with AV block is often a sign of digitalis intoxication. 3:2 and 2:1 AV block is seen in this examp...Knowledge Weavers ECG
57 Atrial tachycardia with exit block and AV blockThe ectopic P waves, easily seen in this example,occur in groups, separated by short pauses. This is likely due to an exit block just distal to the atrial pacemaker. Because not all of the P waves make it to the ventricles, there is also 2nd degree AV block. Therefore, two levels of block are pre...Knowledge Weavers ECG
58 Atypical LBBB with Q waves in leads I and aVLIn typical LBBB, there are no initial Q waves in leads I, aVL, and V6. If Q waves are present in 2 or more of these leads, myocardial infarction is present.Knowledge Weavers ECG
59 Atypical LBBB with primary T wave abnormalitiesPrimary T wave abnormalities in LBBB refer to T waves in the same direction as the major deflection of the QRS. These are seen in leads I, III, aVL, V2-4. Most likely diagnosis is myocardial infarction.Knowledge Weavers ECG
60 Beta-oxidation of a delta-9 fatty acyl CoAEnoyl CoA isomerase is required to move the double bond in a Delta-9 fatty acyl CoA to a position where it can continue in beta-oxidation.Knowledge Weavers Fatty Acids
61 Bifascicular block: RBBB + LAFBBifascicular block: RBBB + LAFBKnowledge Weavers ECG
62 Bifascicular block: RBBB + LAFBThis is the most common of the bifascicular blocks. RBBB is most easily recognized in the precordial leads by the rSR' in V1 and the wide S wave in V6 (i.e., terminal QRS forces oriented rightwards and anterior). LAFB is best seen in the frontal plane leads as evidenced by left axis deviation (-50...Knowledge Weavers ECG
63 Bradycardia-dependent LBBB with carotid sinus massageWhen carotid sinus massage slows the heart rate in this example, the QRS widens into a LBBB. This form of rate-dependent bundle branch block is thought to be due to latent pacemakers in the bundle undergoing phase 4 depolarization; when the sinus impulse enters the partially depolarized bundle, slow...Knowledge Weavers ECG
64 Calibration signal - marquetteCalibration signal - marquetteKnowledge Weavers ECG
65 Cardiac conduction system diagram - marquetteCardiac conduction system diagram - marquetteKnowledge Weavers ECG
66 Compensatory vs. non-compensatory pauses - marquetteCompensatory vs. non-compensatory pauses - marquetteKnowledge Weavers ECG
67 Complete AV block (3rd degree) with junctional rhythmComplete AV block (3rd degree) with junctional rhythmKnowledge Weavers ECG
68 Complete AV block, junctional escape rhythm, and ventriculophasic sinus arrhythmiaComplete AV block is seen as evidenced by the AV dissociation. A junctional escape rhythm sets the ventricular rate at 45 bpm. The PP intervals vary because of ventriculophasic sinus arrhythmia; this is defined when the PP interval that includes a QRS is shorter than a PP interval that excludes a ...Knowledge Weavers ECG
69 Complete oxidation of an odd-chain fatty acid -- overviewThis diagram indicates production of propionyl CoA from an odd-chain fatty acid and the subsequent conversion of propionyl CoA to succinyl CoA, which can be metabolized through the citric (tricarboxylic) acid cycle.BiosynthesisKnowledge Weavers Fatty Acids
70 Conceptual framework: aArrhythmias and conduction abnormalitiesConceptual framework: aArrhythmias and conduction abnormalitiesKnowledge Weavers ECG
71 Condensation of an acyl group with a malonyl groupThe acetyl group displaces the carboxyl of the malonyl group, forming a beta-ketoacyl group. This reaction is catalyzed by beta-ketoacyl Acyl Carrier Peptide synthase. The carboxyl released in the form of bicarbonate regenerates the bicarbonate used earlier in the acetyl CoA carboxylase reaction.Knowledge Weavers Fatty Acids
72 Contraception for women in their later yearsContraception for women in their later reproductive years.Knowledge Weavers Human Reproduction
73 Dehydrogenation of fatty acyl CoAFatty acyl CoA is dehydrogenated by FAD in a reaction catalyzed by one of the acyl CoA dehydrogenases. Note that the dehydrogenation occurs between the alpha- and beta-carbons.FADKnowledge Weavers Fatty Acids
74 Diagram: frontal plane leadsDiagram: frontal plane leadsKnowledge Weavers ECG
75 Diagram: stages of acute Q-wave MIDiagram: stages of acute Q-wave MIKnowledge Weavers ECG
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