Seismocardiographic adjustment of diastolic timed vibrations.
A seismocardiography based methodology is introduced for predicting the start and the end of diastole to be used in diastolic timed vibrations. An accelerometer was placed on the sternum of 142 participants (120 healthy and 22 ischemic heart patients) to record Seismocardiogram (SCG). It is claimed that SCG, in combination with electrocardiogram (ECG), provides a mechanism for predicting diastole. It is demonstrated that prediction of the aortic valve closure point in the SCG signal helps start the vibrator in time to cover most of the isovolumic relaxation period. Also, through prediction of the mitral valve closure point, safety of the technique can be assessed by estimation of the amount of unwanted vibrations applied during the isovolumic contraction period.
Centre for Integrative Bioengineering Research (CiBER), School of Engineering Science, Simon Fraser University, Burnaby, BC, Canada V5A 1S6. kouhyart@sfu.ca
Kouhyar
K
Tavakolian
Farzad
F
Khosrow-Khavar
Behrad
B
Kajbafzadeh
Marcin
M
Marzencki
Shadi
S
Rohani
Bozena
B
Kaminska
Carlo
C
Menon
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003971:Diastole / Q000502:physiology*; D005260:Female; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D008991:Monitoring, Physiologic / Q000379:methods*; D013997:Time Factors; D016276:Ventricular Function; D014732:Vibration; D055815:Young Adult