Health Education Assets Library (HEAL)
 
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TitleDescriptionSubjectCollection
76 Diagram: type I vs. type II 2nd degree AV blockIn type I 2nd degree AV block the PR progressively lengthens until a nonconducted P wave occurs. The PR gets longer by smaller and smaller increments; this results in gradual shortening of the RR intervals. The RR interval of the pause is usually less than the two preceding RR intervals. The RR i...Knowledge Weavers ECG
77 Diagram: AV nodal reentrant tachycardiaThe AV node often has dual pathways; in this diagram the alpha pathway is fast, but has a long refractory period; the beta pathway is conducts more slowly, but recovers faster.In sinus rhythm the faster alpha pathway is used and accounts for the normal PR interval. When a PAC occurs, however, the i...Knowledge Weavers ECG
78 Diagram: digitalis effect on rhythm and conductionDiagram: digitalis effect on rhythm and conductionKnowledge Weavers ECG
79 Diffuse anterolateral T wave abnormalitiesDiffuse anterolateral T wave abnormalitiesT Wave AbnormalitiesKnowledge Weavers ECG
80 Digitalis intoxication: Junctional tachycardia with and without AV blockIn a patient with longstanding atrial fibrillation being treated with digoxin, a regular tachycardia, as seen in A, with a RBBB suggests a junctional or supraventricular tachycardia. Group beating, in B, is likely due to a 2nd degree, Type 1, exit block below the ectopic junctional focus. This is h...Knowledge Weavers ECG
81 Digitalis intoxication: junctional tachycardia with and without exit blockIn A the rhythm is junctional tachycardia with RBBB. In B there is 2nd degree exit block with a 3:2 conduction ratio; i.e., every 3rd junctional impulse fails to reach the ventricles... at least for the first two groupings on 1.4sec.Knowledge Weavers ECG
82 ECG components diagram - marquetteECG components diagram - marquetteKnowledge Weavers ECG
83 ECG intervals and wavesThe P wave represents atrial activation; the PR interval is the time from onset of atrial activation to onset of ventricular activation. The QRS complex represents ventricular activation; the QRS duration is the duration of ventricular activation. The ST-T wave represents ventricular repolarizatio...Knowledge Weavers ECG
84 ECG of the century - part II: dual AV pathwaysAn astute cardiology fellow, yours truly, went to the patient's bedside on Day 2 and massaged the right carotid sinus as indicated by the arrow. Four beats later at a slightly slower heart rate the PR interval suddenly normalized suggesting an abrupt change from a slow AV nodal pathway to a fast AV...Knowledge Weavers ECG
85 ECG of the century: A most unusual 1st degree AV blockOn Day 1, at a heart rate of 103 bpm the P waves are not clearly defined suggesting an accelerated junctional rhythm. However, on Day 2, at a slightly slower heart rate the sinus P wave suddenly appears immediately after the QRS complex. In retrospect, the sinus P wave in Day 1 was found burried i...Knowledge Weavers ECG
86 Electrical and mechanical events diagram - marquetteElectrical and mechanical events diagram - marquetteKnowledge Weavers ECG
87 Electronic atrial pacing - marquetteElectronic atrial pacing - marquetteKnowledge Weavers ECG
88 Electronic ventricular pacemaker rhythm - marquetteElectronic ventricular pacemaker rhythm - marquetteKnowledge Weavers ECG
89 Essential features of a fatty acidThe essential features of a fatty acid are a long hydrocarbon chain terminating in a carboxylic acid group.Knowledge Weavers Fatty Acids
90 Extensive anterior/anterolateral MI: precordial leadsExtensive anterior/anterolateral MI: precordial leadsKnowledge Weavers ECG
91 Extensive anterior/anterolateral MI: recentSignificant pathologic Q-waves (V2-6, I, aVL) plus marked ST segment elevation are evidence for this large anterior/anterolateral MI. The exact age of the infarction cannot be determined without clinical correlation and previous ECGs, but this is likely a recent MI.Knowledge Weavers ECG
92 Fatty acid elongation in mitochondriaThis shows the overall reaction of fatty acid elongation in mitochondria. The process is essentially a reversal of beta-oxidation, except that one NADPH and one NADH are required (beta-oxidation yields two NADH). Mitochondrial fatty acid elongation acts primarily on fatty acyl CoA substrates short...Knowledge Weavers Fatty Acids
93 Fatty acid metabolism -- schematic overviewFatty acids are taken up by cells, where thy may serve as precursors in the synthesis of other compounds, as fuels for energy production, and as substrates for ketone body synthesis. Ketones bodies may then be exported to other tissues, where they can be used for energy production.BiosynthesisKnowledge Weavers Fatty Acids
94 Fatty acyl CoA elongation in the endoplasmic reticulumThis shows the overall process of fatty acyl elongation in the endoplasmic reticulum. The process resembles that catalyzed by fatty acyl synthase, but the individual activities appear to be on separate enzymes.Knowledge Weavers Fatty Acids
95 First degree AV block - marquetteFirst degree AV block - marquetteKnowledge Weavers ECG
96 Folate Pool - The Role of B Vitamins in One-Carbon MetabolismThis figure depicts the pathway for folate utilization and the role of vitamins B6 and B12 in the metabolism of methyl-tetrahydrofolate and homocysteine.Folate; FolicinHEAL Open Review Collection
97 Four systems for denoting fatty acidsThere are four commonly used ways of designating fatty acids. The first two columns show samples of names, and the last two columns show systems of abbreviating these names.NomenclatureKnowledge Weavers Fatty Acids
98 Frontal and horizontal plane lead diagramFrontal and horizontal plane lead diagramKnowledge Weavers ECG
99 Frontal plane QRS axis = +15 degreesFrontal plane QRS axis = +15 degreesKnowledge Weavers ECG
100 Frontal plane QRS axis = +150 degrees (RAD)This is an unusual right axis deviation (RAD). Lead I is negative, which usually means RAD. Lead II is the isoelectric lead, which almost always means -30 degrees; but in this example the axis is 180 degrees away from -30, or +150 degrees.Knowledge Weavers ECG
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