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TitleDescriptionSubjectCollection
76 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
77 RBBB with primary ST-T wave abnormalitiesRBBB is recognized by 1) rR' in V1; 2) QRS duration>0.12s; 3) terminal QRS forces oriented rightwards and anterior. In RBBB the ST-T waves should be oriented opposite to the terminal QRS forces. In this example there areprimary ST-T wave abnormalitiesin leads I, II, aVL, V5, V6. In these leads th...Knowledge Weavers ECG
78 What are those funny looking beats????The differential diagnosis of funny-looking-beats, or FLB's, primarily considers beats of supraventricular origin with aberrant conduction and ventricular ectopic beats. In this example the two FLB's have an easily seen ectopic P wave before them; therefore these are PAC's with RBBB aberration.Knowledge Weavers ECG
79 Conceptual framework: aArrhythmias and conduction abnormalitiesConceptual framework: aArrhythmias and conduction abnormalitiesKnowledge Weavers ECG
80 Atrial flutter with variable AV block - marquetteAtrial flutter with variable AV block - marquetteKnowledge Weavers ECG
81 Compensatory vs. non-compensatory pauses - marquetteCompensatory vs. non-compensatory pauses - marquetteKnowledge Weavers ECG
82 LVH - best seen in the frontal plane leads!LVH - best seen in the frontal plane leads!Knowledge Weavers ECG
83 Propionyl CoA production from odd-chain fatty acidsBeta-oxidation of fatty acids with an odd number of carbons inthe chain yields the three-carbon propionyl CoA as the final fragment.BiosynthesisKnowledge Weavers Fatty Acids
84 Isochronic ventricular rhythmAn isochronic ventricular rhythm is also called an accelerated ventricular rhythm because it represents an active ventricular focus. This arrhythmia is a common reperfusion arrhythmia in acute MI patients. It often begins and ends with fusion beats and there is AV dissociation. Treatment is usuall...Knowledge Weavers ECG
85 LVH: limb lead criteriaIn this example of LVH, the precordial leads don't meet the usual voltage criteria or exhibit significant ST segment abnormalities. The frontal plane leads, however, show voltage criteria for LVH and significant ST segment depression in leads with tall R waves. The voltage criteria include 1) R in...Knowledge Weavers ECG
86 ST segment depressionST segment depression is a nonspecific abnormality that must be evaluated in the clinical context in which it occurs. In a patient with angina pectoris ST depression usually means subendocardial ischemia and, unlike ST elevation, is not localizing to a particular coronary artery lesion.Knowledge Weavers ECG
87 Rate-dependent LBBBIn this rhythm strip of sinus arrhythmia, the faster rates have a LBBB morphology. In some patients with a diseased left bundle branch, the onset of LBBB usually occurs initially as a rate-dependent block; i.e., the left bundle fails to conduct at the faster rate because of prolonged refractoriness...Knowledge Weavers ECG
88 Transfer of a malonyl group to the acyl carrier peptideDuring fatty acid synthesis the incoming two carbon fragment is introduced as the three-carbon malonyl group. It is added to the -SH group of the acyl carier peptide domain of fatty acid synthase. In a subsequent reaction the carbon shown in green will be lost as bicarbonate ion.Knowledge Weavers Fatty Acids
89 RV vs LV PVC's - marquetteRV vs LV PVC's - marquetteKnowledge Weavers ECG
90 RBBB: Precordial leadsRBBB: Precordial leadsKnowledge Weavers ECG
91 Inferior MI and RBBBInferior MI and RBBBKnowledge Weavers ECG
92 Transport of fatty acyl CoA into mitochondria by the carnitine shuttleFatty acyl CoA cannot cross the inner mitochondrial membrane, so it is carried in the form of fatty acyl carnitine.Knowledge Weavers Fatty Acids
93 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
94 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
95 LVH and many PVCsThe combination of voltage criteria (SV2 + RV6>35mm) and ST-T abnormalities in V5-6 are definitive for LVH. There may also be LAE as evidenced by the prominent negative P terminal force in lead V1. Isolated PVCs and a PVC couplet are also present.Knowledge Weavers ECG
96 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
97 Pacemaker failure to capture - marquettePacemaker failure to capture - marquetteKnowledge Weavers ECG
98 WPW type preexcitation - marquetteWPW type preexcitation - marquetteKnowledge Weavers ECG
99 Sinus pause or arrest - marquetteSinus pause or arrest - marquetteKnowledge Weavers ECG
100 SA exit block - marquetteSA exit block - marquetteKnowledge Weavers ECG
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