ECG-2014-Pocket Brain

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A similar phenomenon occurs repetitively in the top tracing.

Ken Grauer's ECG-2014-Pocket Brain PDF

Despite group beating, the top tracing does not represent AV Wenckebach. This is because: 1 the atrial rhythm is not regular as it should be with a conduction disturbance due to AV block, and 2 the PR interval is not progressively increasing within groups of beats. Instead, there is subtle-but-real peaking of the T wave at the onset of each of the relative pauses in this top tracing.

In the context of the lower tracing, it becomes much easier to appreciate that the T waves of beats 2, 5, and probably 8 in the top tracing are all taller than the T waves of beats 1, 3, 4, 6, and 7 that do not contain PACs within them. Thus, there is sinus arrhythmia with frequent PACs on these two sequential tracings.

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PACs are either non-conducted or conducted with aberration. March 15, Reprints Share. Internal Medicine. Report Abusive Comment. Restricted Content You must have JavaScript enabled to enjoy a limited number of articles over the next days. Please click here to continue without javascript.. View PDF. Internal Medicine Alert Begin Test. Shop Now: Search Products. We follow the 6-Parameter Checklist provided in Figure The mechanism is sinus — as determined by the presence of an upright P wave in lead II red arrow with a constant PR interval.

Intervals: The PR interval is normal not more than 1 large box in duration. However — the QRS complex is wide clearly more than half a large box in duration.

LBBB alters the direction of septal depolarization. Since the interventricular septum is the very first part of the ventricles to depolarize — this alteration in direction of septal activation affects Q wave formation when there is LBBB since Q waves are the very first part of the QRS complex. Therefore — No conclusions can be drawn regarding possible prior inferior infarction from the Q waves we see in leads III and aVF of this tracing.

This is a more advanced topic. See Section None of those exceptions appear to be present in this case.

What then are the specific components of our Systematic Approach? We list key elements for each of the 6 Parameters in these next 2 Figures. Look first at a long-lead rhythm strip IF there is one. If not — Look at Lead II:. We often vary the sequence in which we address these 5 parameters — depending on whether atrial activity, QRS width or rhythm regularity are easy or more subtle to assess in the rhythm we are looking at.

We ask ourself the following questions:. Are there P waves? If so — Is the P upright in lead II? Is the Q RS complex wide or narrow?


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What is the R ate? Is the rhythm R egular? The P R Interval — should not be more than 1 large box in duration. Clinically — It often suffices to simply determine the Quadrant within which the Axis lies.

IF you are within to degrees of the actual Axis — this is more than accurate enough for our purposes. Clinical Perspective: Realistically — The amount of clinical information that determination of Axis provides is limited. Slight LAD is not necessarily abnormal. Slight RAD is not necessarily abnormal.

Patients with pulmonary disease are also prone to an indeterminate Axis.

EKG Interpretation - Master Basics Concepts of ECG

Satisfying either the 35 mm or 12 mm voltage criteria suffices. Instead — Focus your attention on the remaining 11 leads. Look at each lead for:. In contrast — larger and wider Q waves are more likely to indicate infarction. The larger and wider a Q wave is — the more likely it is that infarction has occurred at some point. The normal ST segment is isoelectric.

Alternatively — the TP baseline may be used. Is there ST elevation or depression? What is the shape of any ST-T wave changes? What part location of the heart affected?

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About ECG Competency

Interpret the lead ECG shown in Figure We then formulate our Clinical Impression — based on the history See below. Intervals: All 3 intervals are normal. Bottom Line: These detailed calculations in an attempt to fine tune Axis estimation extend beyond-the-core of what is needed.

Hypertrophy: There would be voltage for LVH if this patient was over