  The Electrocardiograph signal represents the heart's electrical activity
while blood pressure results from the heart's mechanical activity. Previous
studies have investigated how the heart's electrical and mechanical activities
are related and have referred to their relationship as the Mechano-Electric
Coupling term. A new method to estimate the blood pressure including is
proposed which uses only the Electrocardiograph signal. In spite of studies
performed on feature extraction based on the signals' physiological parameters
(Parameter-based), in this work, the feature vectors are formed with samples of
the Electrocardiograph signal in a particular time frame (Whole-based) and
these vectors are input into Adaptive Boosting Regression to estimate blood
pressure. The nonlinear relationship which correlates blood pressure with the
Electrocardiograph signal is concluded by the results of this study. According
to the results, the used algorithms, for estimating both diastolic blood
pressures and mean arterial pressure, are in compliance with the standards of
the Association for the Advancement of Medical Instrumentation. Also, according
to the British Hypertension Society standard, estimating diastolic blood
pressures and mean arterial pressure with the proposed method attain an A grade
while it achieves B for systolic blood pressure. The results indicate that
using the introduced method, blood pressure can be estimated continuously,
noninvasively, without cuff, calibration-free and by using only the
Electrocardiograph signal.
