Wavelet and Hilbert-Huang transform used in cardiology

A pacemaker is a small electronic device implanted under the skin near the collarbone. Pacemakers monitor the heart´s electrical activity. If the heart is beating too slowly or pausing too long between beats, the pacemaker will provide electrical impulses that stimulate the heart to beat. The pacemaker itself consists of a small box (the pulse generator) and one to three leads that are placed in the heart. This paper shortly describe electronic evaluating system which enables to find (in coordination with physician) an optimal pacemaker electrical impulses, e.g. pulse width, amplitude, delay and lead (or leads) position in heart to reducing the delivered energy. Inputs to electronic evaluating system are taken from ECG (electro cardio graph). This paper is mainly devoted to signal processing, based on wavelets analysis and Hilbert-Huang transformation (HHT) which enables to find hidden pacemaker electrical impulses in ECG (electro cardio graph signal) and evaluation of quantitative seismocardiography (QSCG). Results will be helpful for prolonging pacemaker battery life and reducing the stimuli pain on patients with implantable pacemaker and also for QSCG signal evaluation.