Health Education Assets Library (HEAL)
 
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TitleDescriptionSubjectCollection
126 Ventricular bigeminy - marquetteVentricular bigeminy - marquetteKnowledge Weavers ECG
127 LBBB and 2nd degree AV block, mobitz type IMobitz II 2nd degree AV block is usually a sign of bilateral bundle branch disease. One of the two bundle branches should be completely blocked; in this example the left bundle is blocked. The nonconducted sinus P waves are most likely blocked in the right bundle which exhibits 2nd degree block. ...Knowledge Weavers ECG
128 Infero-posterior MI&RBBBDeep Q waves in II, III, aVF plus tall R waves in V1-2 are evidence for this infero-posterior MI. The wide QRS (>0.12s) and RR' complex in V1 are evidence for RBBB. Any time RBBB has an initial R in V1 equal to or greater than the R', true posterior MI must be considered. Q waves in V5-6 suggest a...Knowledge Weavers ECG
129 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
130 Nonconducted PAC's slowing the heart rateConsecutive nonconducted PAC's, indicated by arrows, can significantly slow the heart rate. Note the distortion of the ST-T waves caused by the PAC. A hint in recognizing nonconducted PAC's is to find conducted PAC's in the same rhythm strip.Knowledge Weavers ECG
131 three fates of PAC's: 1. normal conduction; 2. aberrant conduction; 3. non-conductionthree fates of PAC's: 1. normal conduction; 2. aberrant conduction; 3. non-conductionKnowledge Weavers ECG
132 QRS axis = 0 degreesLead aVF is isoelectric; lead I is positive; therefore, the QRS axis is 0 degrees.Knowledge Weavers ECG
133 Ventricular fusion beat - marquetteVentricular fusion beat - marquetteKnowledge Weavers ECG
134 60 cycle artifact - marquette60 cycle artifact - marquetteKnowledge Weavers ECG
135 LBBB: precordial leadsLBBB: precordial leadsKnowledge Weavers ECG
136 Not all sore thumbs are ventricular in originPACs have three fates: normal conduction into ventricles, aberrant conduction in ventricles due to bundle branch or fascicular block, and non-conduction due to block in AV junction. In this example PAC 1 is normally conducted and PAC 2 is conducted with RBBB aberration. The longer preceding cycle ...Knowledge Weavers ECG
137 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
138 Ventricular Pacemaker Rhythm: V1-3Note the small pacemaker spikes before the QRS complexes. In addition, the QRS complex in V1-3 exhibits ventricular ectopic morphology; i.e., there is a slur or notch at the beginning of the S wave, and >60ms delay from onset to QRS to nadir of S wave. This rules against a supraventricular rhythm wi...Knowledge Weavers ECG
139 Inferior MI: fully evolvedSignificant pathologic Q-waves are seen in leads II, III, aVF along with resolving ST segment elevation and symmetrical T wave inversion. This is a classic inferior MI.Knowledge Weavers ECG
140 Complete AV block (3rd degree) with junctional rhythmComplete AV block (3rd degree) with junctional rhythmKnowledge Weavers ECG
141 QRS axis = +90 degreesLead I is isoelectric; II and III are positive; the axis is +90 degrees.Knowledge Weavers ECG
142 Left bundle branch block - marquetteLeft bundle branch block - marquetteKnowledge Weavers ECG
143 Junctional escape rhythmJunctional escape rhythmKnowledge Weavers ECG
144 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
145 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
146 Atrial flutter with 2:1 conduction: leads II, III, V1Atrial flutter with 2:1 conduction: leads II, III, V1Knowledge Weavers ECG
147 Pacemaker lead wire placement diagram - marquettePacemaker lead wire placement diagram - marquetteKnowledge Weavers ECG
148 Frontal and horizontal plane lead diagramFrontal and horizontal plane lead diagramKnowledge Weavers ECG
149 ST segment diagram - marquetteST segment diagram - marquetteKnowledge Weavers ECG
150 Atrial bigeminy - marquetteAtrial bigeminy - marquetteKnowledge Weavers ECG
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