By George J. Taylor
The 3rd version of a hundred and fifty perform ECGs: Interpretation and evaluation combines perform tracings with scientific cardiology, offering scholars with the sensible wisdom essential to learn, interpret, and comprehend ECGs. This crucial assessment ebook is prepared into 3 sections: introductory textual content reviewing ECG diagnostic standards, pathophysiology, and scientific correlation; one hundred fifty ECG tracings with a short medical background; and interpretation and educating issues for every of the one hundred fifty ECGs. a hundred and fifty perform ECGs: Interpretation and overview, third version is perfect as an introductory textual content for clinical and nursing scholars at any level of teaching, for citizens and fellows as a refresher prior to board checks, and for the delicate student/teacher as a entire educating dossier.
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Additional info for 150 Practice ECGs: Interpretation and Review
During VT, if there is no retrograde conduction of ventricular impulses through the AV node to the atria (and there usually is not), the atria continue to beat independently. 20). When electrophysiologists are unsure of the cause of wide-complex tachycardia, they record an ECG from within the right atrium. At this location, P waves are huge and easy to see: AV dissociation makes the diagnosis of VT. Torsade de pointes is a curious form of VT that is a favorite of Board examiners. 21). ” Conditions and drugs that cause QT interval prolongation may precipitate the arrhythmia.
This is the time that it takes the LV to be activated, and it is longer when the ventricle is thickened. 5). The diagnosis can be made when just some of these features are present, but with fewer findings the certainty of the diagnosis is lower. 1. A point total of 5 makes the diagnosis of LVH, and with 4 points, the patient has probable LVH. Use of multiple diagnostic criteria rather than QRS voltage alone gives good specificity (fewer false positives, less overdiagnosis). 0RACTICE %#'S )NTERPRETATION AND 2EVIEW On the other hand, the sensitivity of the ECG in detecting LVH is poor; it tends to underdiagnose.
The P wave axis is not usually measured; as long as it is positive in inferior leads, it is good enough. When it is negative in those leads, it indicates an ectopic atrial pacemaker located in the lower part of the atrium and depolarizing the atrium from bottom to top. This has little clinical significance, but it is worth comment in the context of reading ECGs. 3). The left ventricle is much thicker than the right and produces more voltage. The net vector of ventricular depolarization is therefore down and/or to the left in the frontal plane, normally about 60°, but ranging from 30° to 110°.