TY - JOUR
T1 - Precordial ST-segment mapping 3. Stability of maps in the early phase of acute myocardial infarction
AU - Madias, John E.
AU - Hood, William B.
N1 - Funding Information:
From the Cardiology Division of the Thorndike Memorial Laboratory and the Department of Medicine, Boston City Hospital, Boston University School of Medicine, Boston, Massachusetts 02118. Supported by United States Public Health Service Grants HL-14646, RR-533, HE-07299, Contract 71-2498, and American Heart Association Grant 74-1031. Received for publication Jan. 8, 1976. Reprint requests: John E. Madias, M.D., Cardiology Division, Boston City Hospital, 818 Harrison Ave., Boston, Mass. 02118. *Presented in part before the 50th Annual Session of the American College of Physicians, San Francisco, California, on April 10, 1975.
PY - 1977/5
Y1 - 1977/5
N2 - To evaluate the stability of precordial ST-segment mapping techniques in assessing ischemic myocardial injury, we studied 28 patients with acute anterior myocardial infarction using a 49-lead electrocardiographic system (1 mV.=10 mm.). The sum of ST elevations in millimeters was taken as an index of ischemic injury, and remained stable in two consecutive maps made approximately one hour apart (65.8±8.4 vs. 63.8±8.7 mm.). The number of sites showing ST elevation≥one mm. was taken as an index of extent of injury, and showed a small but statistically significant decline (23.9±4.5 vs. 22.3±4.2 mm.) during the same time interval. Blood pressure and heart rate remained stable. Changes in the map were observed in five patients, but could be explained in four by abrupt alterations in clinical status. In one patient no explanation for alterations in the map was apparent. We conclude that precordial ST segment maps are usually stable in the early stages of anterior myocardial infarction, but should be used to evaluate interventions only with careful clinical monitoring, and with the knowledge that occasional unexplained variations do occur.
AB - To evaluate the stability of precordial ST-segment mapping techniques in assessing ischemic myocardial injury, we studied 28 patients with acute anterior myocardial infarction using a 49-lead electrocardiographic system (1 mV.=10 mm.). The sum of ST elevations in millimeters was taken as an index of ischemic injury, and remained stable in two consecutive maps made approximately one hour apart (65.8±8.4 vs. 63.8±8.7 mm.). The number of sites showing ST elevation≥one mm. was taken as an index of extent of injury, and showed a small but statistically significant decline (23.9±4.5 vs. 22.3±4.2 mm.) during the same time interval. Blood pressure and heart rate remained stable. Changes in the map were observed in five patients, but could be explained in four by abrupt alterations in clinical status. In one patient no explanation for alterations in the map was apparent. We conclude that precordial ST segment maps are usually stable in the early stages of anterior myocardial infarction, but should be used to evaluate interventions only with careful clinical monitoring, and with the knowledge that occasional unexplained variations do occur.
UR - http://www.scopus.com/inward/record.url?scp=0017370405&partnerID=8YFLogxK
U2 - 10.1016/S0002-8703(77)80011-2
DO - 10.1016/S0002-8703(77)80011-2
M3 - Article
C2 - 851060
AN - SCOPUS:0017370405
SN - 0002-8703
VL - 93
SP - 603
EP - 609
JO - American Heart Journal
JF - American Heart Journal
IS - 5
ER -