2.50
Hdl Handle:
http://hdl.handle.net/10755/161619
Type:
Presentation
Title:
Are the Currently Used Posterior Ecg Parameters Accurate?
Abstract:
Are the Currently Used Posterior Ecg Parameters Accurate?
Conference Sponsor:Midwest Nursing Research Society
Conference Year:2002
Author:Wung, Shu-Fen, PhD
P.I. Institution Name:University of Arizona
Title:Associate Professor
Contact Address:College of Nursing, PO Box 210203, Tucson, AZ, 85721-0203, USA
Contact Telephone:520.626.4305
There has been a growing recognition of the usefulness of additional posterior ECG leads in diagnosing acute posterior wall myocardial infarction. However, lack of research on normal posterior ECG parameters in older subjects without coronary artery disease. Some researchers have arbitrarily defined the posterior ECG parameters. It is unknown if these posterior ECG parameters are accurate. Method: Continuous posterior leads V7-9 were recorded in 129 patients undergoing cardiac catheterization. Among these, 21 patients (16%) did not have coronary artery disease confirmed by cardiac catheterization. All ECG parameters were analyzed using computer-assisted measurements. Results: The mean age of the sample was 62 ±13 years, and 62% were women. No Q wave duration of > 40 ms was observed in all 3 leads. However, Q wave of > 30 ms was observed in 2 subjects (10%) in V8 and in 6 subjects (29%) in V9. The mean R wave amplitudes were 8±2 mm in V7, 7±2 mm in V8, and 5±2 mm in V9. The ST segments at J+60 ms were 12±23 µV, 9±23 µV, and 2±21 µV. The prevalence of ST measurements of 0.5-1 mm (50-100 µV) was observed in 2 subjects in V7 (10%) and 1 subject in V8 (5%). None of the baseline ST measurement reached 1 mm (100 µV) in amplitude. Conclusion: The criteria, Q > 30 ms in the posterior leads, currently used to diagnose posterior myocardial infarction by some investigators may not be appropriate. The R wave amplitudes in the posterior leads are small, especially in V9. None of the normal ST measurements in the posterior leads exceeded 1 mm. Accurate computerized measurement of the normal ST segment and other parameters in these posterior ECG leads can improve their diagnostic value and to facilitate their use in clinical practice.
Repository Posting Date:
26-Oct-2011
Date of Publication:
17-Oct-2011
Sponsors:
Midwest Nursing Research Society

Full metadata record

DC FieldValue Language
dc.typePresentationen_GB
dc.titleAre the Currently Used Posterior Ecg Parameters Accurate?en_GB
dc.identifier.urihttp://hdl.handle.net/10755/161619-
dc.description.abstract<table><tr><td colspan="2" class="item-title">Are the Currently Used Posterior Ecg Parameters Accurate?</td></tr><tr class="item-sponsor"><td class="label">Conference Sponsor:</td><td class="value">Midwest Nursing Research Society</td></tr><tr class="item-year"><td class="label">Conference Year:</td><td class="value">2002</td></tr><tr class="item-author"><td class="label">Author:</td><td class="value">Wung, Shu-Fen, PhD</td></tr><tr class="item-institute"><td class="label">P.I. Institution Name:</td><td class="value">University of Arizona</td></tr><tr class="item-author-title"><td class="label">Title:</td><td class="value">Associate Professor</td></tr><tr class="item-address"><td class="label">Contact Address:</td><td class="value">College of Nursing, PO Box 210203, Tucson, AZ, 85721-0203, USA</td></tr><tr class="item-phone"><td class="label">Contact Telephone:</td><td class="value">520.626.4305</td></tr><tr class="item-email"><td class="label">Email:</td><td class="value">shufen@uic.edu</td></tr><tr><td colspan="2" class="item-abstract">There has been a growing recognition of the usefulness of additional posterior ECG leads in diagnosing acute posterior wall myocardial infarction. However, lack of research on normal posterior ECG parameters in older subjects without coronary artery disease. Some researchers have arbitrarily defined the posterior ECG parameters. It is unknown if these posterior ECG parameters are accurate. Method: Continuous posterior leads V7-9 were recorded in 129 patients undergoing cardiac catheterization. Among these, 21 patients (16%) did not have coronary artery disease confirmed by cardiac catheterization. All ECG parameters were analyzed using computer-assisted measurements. Results: The mean age of the sample was 62 &plusmn;13 years, and 62% were women. No Q wave duration of &gt; 40 ms was observed in all 3 leads. However, Q wave of &gt; 30 ms was observed in 2 subjects (10%) in V8 and in 6 subjects (29%) in V9. The mean R wave amplitudes were 8&plusmn;2 mm in V7, 7&plusmn;2 mm in V8, and 5&plusmn;2 mm in V9. The ST segments at J+60 ms were 12&plusmn;23 &micro;V, 9&plusmn;23 &micro;V, and 2&plusmn;21 &micro;V. The prevalence of ST measurements of 0.5-1 mm (50-100 &micro;V) was observed in 2 subjects in V7 (10%) and 1 subject in V8 (5%). None of the baseline ST measurement reached 1 mm (100 &micro;V) in amplitude. Conclusion: The criteria, Q &gt; 30 ms in the posterior leads, currently used to diagnose posterior myocardial infarction by some investigators may not be appropriate. The R wave amplitudes in the posterior leads are small, especially in V9. None of the normal ST measurements in the posterior leads exceeded 1 mm. Accurate computerized measurement of the normal ST segment and other parameters in these posterior ECG leads can improve their diagnostic value and to facilitate their use in clinical practice.</td></tr></table>en_GB
dc.date.available2011-10-26T23:24:22Z-
dc.date.issued2011-10-17en_GB
dc.date.accessioned2011-10-26T23:24:22Z-
dc.description.sponsorshipMidwest Nursing Research Societyen_GB
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