| Abstract: | ECGs were taken with 30 precordial leads
arranged in 5 rows and 6 columns in 100 healthy
individuals and 120 patients. Tracings taken
from the same subject and arranged in geogra-
phic order into an array gave a composite pic-
ture of precordial QRS mapping with distinct
characteristics. For each component wave in
the QRS complex, there was a definite center of
peak activity spreading out in diminishing
strength to its surrounding areas. From the
pathologic findings in the precordial mappings
of acute and chronic myocardial infarction pa-
tients, the authors tentatively put forward the
following criteria for the diagnosis of myocardial
infarction: presence of abnormai o or q centers;
widening of the "physiologic S area"; and
presence of R sinks. For myocardiopathy, the
criteria are: presence of Q center or abnormally
deep, narrow and ectopic q center; deep S wave
at S center or high R at R center; and presence
of obvious R sinks. Besides, the authors have the
impression that this composite picture by con-
ventional ECG method was quite similar to the
main pattern of synchronous isopotential surface
mapping during ventricular depolarization and
in our clinical practice proved to be simple and
effective as, an adjuvant to the conventional
ECG in diagnosis of many diseases. |
