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 | ||
|---|---|---|---|---|---|
| 176 |
 |
LVH | In 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 a... | Knowledge Weavers ECG | |
| 177 |
 |
A nonconducted PAC causes an unexpected pause | Unexpected pauses in rhythm have several causes, the most frequent being a nonconducted PAC. In this example the nonconducted PAC is seen in the ST segment of the pause. Note the change in the ST-T compared to the other ST-T waves. | Knowledge Weavers ECG | |
| 178 |
 |
Giant TU fusion waves | TU fusion waves are often seen in long QT syndromes. The differential diagnosis of this ECG abnormality includes electrolyte abnormalities -hypokalemia, CNS disease, e.g., subarachnoid hemorrhage; hereditary long QT syndromes, and drugs such as quinidine. | Knowledge Weavers ECG | |
| 179 |
 |
Left anterior fascicular block (LAFB) | LAFB is the most common of the intraventricular conduction defects. It is recognized by 1) left axis deviation; 2) rS complexes in II, III, aVF; and 3) small q in I and/or aVL. | Knowledge Weavers ECG | |
| 180 |
 |
Atrial flutter with 2:1 AV conduction: lead V1 | The arrows point to two flutter waves for each QRS complex. Atrial rate = 280; ventricular rate = 140. | Knowledge Weavers ECG | |
| 181 |
 |
Long QT Interval and Giant Negative T Waves | Long QT Interval and Giant Negative T Waves | Knowledge Weavers ECG | |
| 182 |
 |
Frontal plane QRS axis = -15 degrees | Frontal plane QRS axis = -15 degrees | Knowledge Weavers ECG | |
| 183 |
 |
Ventricular pacemaker rhythm | Note the small pacemaker spikes before the QRS complexes in many of the leads. In addition, the QRS complex in V1 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 suprav... | Knowledge Weavers ECG | |
| 184 |
 |
Acylation of carnitine by a long chain fatty acyl CoA | Long chain fatty acyl CoA cannot cross the inner mitochondrial membrane to participate in beta-oxidation. The fatty acyl group is therefore transferred to a carrier, carnitine, in a reversible reaction catalyzed by carnitine acyl transferase I. The resulting fatty acyl carnitine crosses the membra... | Knowledge Weavers Fatty Acids | |
| 185 |
 |
Diffuse anterolateral T wave abnormalities | Diffuse anterolateral T wave abnormalities | T Wave Abnormalities | Knowledge Weavers ECG |
| 186 |
 |
Four systems for denoting fatty acids | There 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. | Nomenclature | Knowledge Weavers Fatty Acids |
| 187 |
 |
Frontal plane QRS axis = -45 degrees | Frontal plane QRS axis = -45 degrees | Knowledge Weavers ECG | |
| 188 |
 |
Marked sinus arrhythmia - marquette | Marked sinus arrhythmia - marquette | Knowledge Weavers ECG | |
| 189 |
 |
Muscle tremor artifact - marquette | Muscle tremor artifact - marquette | Knowledge Weavers ECG | |
| 190 |
 |
RBBB + LAFB: bifascicular block | RBBB + LAFB: bifascicular block | Knowledge Weavers ECG | |
| 191 |
 |
Reduction of 2-enoyl acyl carrier peptide | A 2-enoyl acyl group on the acyl carrier peptide is reduced by NADPH in a reaction catalyzed by enoyl acyl carrier peptide reductase. | Knowledge Weavers Fatty Acids | |
| 192 |
 |
ECG of the century: A most unusual 1st degree AV block | On 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 | |
| 193 |
 |
RBBB plus mobitz II 2nd degree AV block | The classic rSR' in V1 is RBBB. Mobitz II 2nd degree AV block is present because the PR intervals are constant. Statistically speaking, the location of the 2nd degree AV block is in the left bundle branch rather than in the AV junction. The last QRS in the top strip is a junctional escape, since... | Knowledge Weavers ECG | |
| 194 |
 |
Left axis deviation: QRS axis = -60 degrees | Lead aVR is isoelectric; leads II and III are mostly negative. The QRS axis, therefore, is -60 degrees. | Knowledge Weavers ECG | |
| 195 |
 |
QRS axis = +30 degrees | Lead III is isoelectric; leads I and II are positive. The QRS axis, therefore, is +30 degrees. | Knowledge Weavers ECG | |
| 196 |
 |
methylmalonyl CoA racemase reaction | In the metabolism of propionyl CoA, D-methylmalonyl CoA is produced by a carboxylase reaction. This product must be converted to L-methylmalonyl CoA in order to be metabolized further. The conversion is catalyzed by methylmalonyl CoA racemase. | Knowledge Weavers Fatty Acids | |
| 197 |
 |
Pacemaker failure to sense - marquette | Pacemaker failure to sense - marquette | Knowledge Weavers ECG | |
| 198 |
 |
Pacemaker fusion beat - marquette | Pacemaker fusion beat - marquette | Knowledge Weavers ECG | |
| 199 |
 |
RAE & RVH | RAE & RVH | Knowledge Weavers ECG | |
| 200 |
 |
Oxidation of a polyunsaturated fatty acid -- part I | The cycles of beta-oxidation prior to the one involving the original Delta-12 double bond act to get past the Delta-9 double bond. | Knowledge Weavers Fatty Acids |