IAM   02674
INSTITUTO ARGENTINO DE MATEMATICA ALBERTO CALDERON
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Study of QRS-Loop Parameters and Conventional ST-T Indexes for Identification of Ischemic and Healthy Subjects
Autor/es:
CORREA, RAUL ; ARINI, PEDRO D. ; VALENTIBUZZI, MAXIMO E.; LACIAR, ERIC
Lugar:
Cracovia
Reunión:
Conferencia; XXIX International Conference on Computers in Cardiology; 2012
Resumen:
Several studies have shown the
usefulness of the vectorcardiogram (VCG) and the electrocardiogram (ECG) for
the detection of cardiac ischemia. We computed a set of VCG and ECG parameters
to identify ischemic patients from healthy subjects. The study groups consisted
of 80 ischemic patients and 52 healthy subjects. For both populations, five VCG
parameters computed on QRS-loop were analyzed, i.e.: (a) Volume, (b) Planar
Area, (c) Ratio between Area and Perimeter, (d) Perimeter, and (e) Distance
between Centroid and Loop. Likewise, three conventional ECG ST-T parameters
were calculated, i.e: (f) ST Vector Magnitude, (g) ST segment level and, (h)
T-wave amplitude. Results indicate that VCG and ECG parameters have significant
differences between healthy and ischemic subjects. The QRS-loop parameter with
the best global performance was Volume, which reached a Sensitivity (Se)=64.5%,
a Specificity (Sp)=74.6%, and an Area Under Relative Operating Characteristic
Curve (AUC)= 0.77. The best ST-T index was STVM, which obtained Se= 73.2%,
Sp=73.9%, and AUC=0.79. However, when all QRS-loop and ST-T parameters were
combined, we obtained Se=90.9%, Sp=93.7% and AUC=0.97. In conclusion, the
inclusion of QRS-loop parameters improves the conventional ST-T analysis in the
identification of ischemic patients.