To study thefactors determining the positively of late potentials and
its prevalence in unstable angina, fifty unstable angina patients together
with a sex and age matched twenty stable angina patients serving as
control were included in this study. All were subjected to careful history
taking & clinical examination, laboratory blood analysis; twelve leads
resting surface ECG; echo-Doppler study; 24-hours Holtermonitoring and
signal averaged ECG (SAECG) namelyfiltered QRS complexduration, root
ofthemean square ofsignal amplitude in the last 40 msec ofthefiltered
QRS and the duration ofterminalfiltered lowsignal amplitude (LAS) with
frequency amplitude < 40 uv. Echo-Doppler; Hotter monitoring and
SAECG were repeated two weeks laterfor the unstable anginapatients.
Exercise treadmillwas done to confirmthe diagnosis ofstable anginapatients.
In the present study the incidence ofpositive LPs was 24% on ad
mission and was significantly reduced to 14% after 2 weeks of medical
therapy in unstable angina patients. However, non of the stable angina
patients hadpositive LPs. All the parameters ofSAECGwere significantly
higher in the unstable angina patients. Sex and age had no effect on the
incidence of LPs, inferior ischemia had significantly higher positive LPs
than anterior ischemia /5596 us 33967 . Hotter-reported ischaemic episodes
and echo-reported regional wall motion abnormalities were significantly
positively correlated with positive LPs |
