>25mm precordials
English translation: height of the R wave in the precordial leads
| 06:12 Mar 19, 2010 |
| English language (monolingual) [PRO] Medical - Medical: Cardiology / ECG | |||||||
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|  Selected response from: Filippe Vasconcellos de Freitas Guimarães Brazil Local time: 15:16 | ||||||
Grading comment
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| SUMMARY OF ALL EXPLANATIONS PROVIDED | ||||
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| 4 | height of the R wave in the precordial leads |
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| 3 | please see below |
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Answers
2 hrs confidence: 
height of the R wave in the precordial leads Explanation: See http://www.gp-training.net/protocol/cardiovascular/ecgrep.ht... and http://en.wikipedia.org/wiki/QRS_complex -------------------------------------------------- Note added at 2 hrs (2010-03-19 09:05:27 GMT) -------------------------------------------------- That is, The R wave is: *Taller than 25 mm in all precordial leads (V1, V2, V3, V4, V5, and V6) *Taller than 12 mm in the aVL lead *Taller than 20 mm in leads II, III, and aVF Reference: http://www.medscape.com/viewarticle/523924 |
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2 hrs confidence:
please see below Explanation: Definition of precordial lead: 1. A lead of an electrocardiograph that has one electrode placed in any of six standard positions on the chest and another electrode placed on a limb. 2. A record obtained from such a lead. Also called chest lead. Precordial leads The electrodes for the precordial leads (V1, V2, V3, V4, V5, and V6) are placed directly on the chest. Because of their close proximity to the heart, they do not require augmentation. Wilson's central terminal is used for the negative electrode, and these leads are considered to be unipolar (recall that Wilson's central terminal is the average of the three limb leads. This approximates common, or average, potential over the body). The precordial leads view the heart's electrical activity in the so-called horizontal plane. The heart's electrical axis in the horizontal plane is referred to as the Z axis. http://66.102.9.132/search?q=cache:ToV3XuDpv8AJ:en.wikipedia... The activity of the heart is recorded on ECG paper which moves at a rate of 25 mm per second, e.g. Time, Intervals, And Amplitude Of The ECG Tracing The EKG paper is a ruled paper that is usually heat sensitive. The smallest division on the paper is a one millimeter box. The largest division on the paper is a five millimeter box. By international convention, the speed of the paper moves at a rate of 25 millimeters per second past the stylus. This is the speed that makes all of the tracings look appropriate for any lead that is being viewed. Because the speed of the paper is 25 mm/second, a small 1 mm box is traversed in .04 seconds and a large 5 mm box is traversed in .2 seconds. http://66.102.9.132/search?q=cache:y6rYUvJoj2EJ:faculty.etsu... A typical electrocardiograph runs at a paper speed of 25 mm/s, although faster paper speeds are occasionally used. Each small block of ECG paper is 1 mm2. At a paper speed of 25 mm/s, one small block of ECG paper translates into 40 ms. http://66.102.9.132/search?q=cache:ToV3XuDpv8AJ:en.wikipedia... -------------------------------------------------- Note added at 3 hrs (2010-03-19 09:35:11 GMT) -------------------------------------------------- Limb Leads R-wave in lead I + S-wave in lead III > 25 mm R-wave in aVL > 11 mm R-wave in aVF > 20 mm S-wave in aVR > 14 mm Precordial Leads R-wave in V5 or V6 >26 mm ... http://books.google.com/books?id=lQ0zq-t7g3EC&pg=PA212&lpg=P... |
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