The Health Education Assets Library (HEAL) is a collection of over 22,000 freely available digital materials for health sciences education. The collection is now housed at the University of Utah J. Willard Marriott Digital Library.
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| Title | Description | Subject | Collection | ||
|---|---|---|---|---|---|
| 251 |
 |
Old inferior MI | Old inferior MI | Knowledge Weavers ECG | |
| 252 |
 |
Beta-oxidation of a delta-9 fatty acyl CoA | Enoyl 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 | |
| 253 |
 |
Thiolase reaction with acetoacetyl CoA | Thiolase (3-ketoacyl CoA thiolase) cleaves acetoacetyl CoA, forming two molecules of acetyl CoA. | Knowledge Weavers Fatty Acids | |
| 254 |
 |
Stearic acid structure | Stearic acid is a typical long chain saturated fatty acid. | Knowledge Weavers Fatty Acids | |
| 255 |
 |
Diagram: type I vs. type II 2nd degree AV block | In 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 | |
| 256 |
 |
PAC's with RBBB aberration | These PAC's, indicated by arrows, enter the ventricles and find the right bundle refractory. They therefore conduct with RBBB aberrancy. In most normal hearts the right bundle recovery time is longer than the left bundle's; most aberrancy, therefore, has aRBBB morphology. In some diseased hearts t... | Knowledge Weavers ECG | |
| 257 |
 |
RBBB + LAFB = bifascicular block | The RBBB is diagnosed by the wide QRS with prominent anterior (e.g., V1) and late rightward (e.g., I, V6) forces. The LAFB is recognized by the marked left axis deviation (-75 degrees) in the frontal plane, rS complexes in II, III, aVF, and the tiny q-wave in aVL. | Knowledge Weavers ECG | |
| 258 |
 |
Massage parlor games | When unsure of the mechanism of a supraventricular tachycardia, carotid sinus massage may help make the diagnosis. In this example, carotid sinus massage causes marked AV block which permits easy recognition of the rapid, regular atrial flutter waves. | Knowledge Weavers ECG | |
| 259 |
 |
Wandering baseline artifact - marquette | Wandering baseline artifact - marquette | Knowledge Weavers ECG | |
| 260 |
 |
Frontal plane QRS axis = +15 degrees | Frontal plane QRS axis = +15 degrees | Knowledge Weavers ECG | |
| 261 |
 |
Frontal plane QRS axis = +30 degrees | Frontal plane QRS axis = +30 degrees | Knowledge Weavers ECG | |
| 262 |
 |
Acute inferoposterior MI | Acute inferoposterior MI | Knowledge Weavers ECG | |
| 263 |
 |
Sinus bradycardia | Sinus bradycardia | Knowledge Weavers ECG | |
| 264 |
 |
2nd degree AV block, mobitz type II, with LBBB | The wide QRS complexes in lead V1 indicates LBBB. 2nd degree AV block, Mobitz II is suggested by the two fixed PR intervals prior to the nonconducted P wave. The location of the block is most likely in the right bundle, because Mobitz II is usually a sign of bilateral bundle branch disease. | Knowledge Weavers ECG | |
| 265 |
 |
A very subtle atrial tachycardia with 2:1 block | Although at first glance this looks like normal sinus rhythm at 95 bpm. On closer look, there are 2 P waves for every QRS; the atrial rate is 190 bpm. Note the hidden P in the T waves. This rhythm is likely due to digitalis intoxication, as are the GI symptoms. | Knowledge Weavers ECG | |
| 266 |
 |
Left atrial enlargement | Left atrial enlargement is illustrated by increased P wave duration in lead II, top ECG, and by the prominent negative P terminal force in lead V1, bottom tracing. | Knowledge Weavers ECG | |
| 267 |
 |
Acute postero-lateral MI: precordial leads | Acute postero-lateral MI: precordial leads | Knowledge Weavers ECG | |
| 268 |
 |
Pacemaker failure to pace - marquette | Pacemaker failure to pace - marquette | Knowledge Weavers ECG | |
| 269 |
 |
Frontal plane QRS axis = 90 degrees | Frontal plane QRS axis = 90 degrees | Knowledge Weavers ECG | |
| 270 |
 |
Junctional tachycardia - marquette | Junctional tachycardia - marquette | Knowledge Weavers ECG | |
| 271 |
 |
Diagram: frontal plane leads | Diagram: frontal plane leads | Knowledge Weavers ECG | |
| 272 |
 |
Inferoposterior MI | Inferoposterior MI | Knowledge Weavers ECG | |
| 273 |
 |
Digitalis intoxication: Junctional tachycardia with and without AV block | In 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 | |
| 274 |
 |
Nonconducted PACs and junctional escapes | Although at first glance this looks like 2nd degree AV block, the P waves indicated by the arrows are premature and not sinus P waves. The pause is long enough to encourage a junctional escape focus to take over. Note the sinus P waves just before the escape beats. Had the escapes not occurred, t... | Knowledge Weavers ECG | |
| 275 |
 |
WPW diagram | The short PR interval is due to a bypass track, also known as the Kent pathway. By bypassing the AV node the PR shortens. The delta wave represents early activation of the ventricles from the bypass tract. The fusion QRS is the result of two activation sequences, one from the bypass tract and one... | Knowledge Weavers ECG |