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Cardiac echo‐differentiation (CED) evaluated with phonocardiography
Author(s) -
Galbo H.,
Paulev P. E.,
Neumann F.,
Pedersen P. C.
Publication year - 1973
Publication title -
journal of clinical ultrasound
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.272
H-Index - 61
eISSN - 1097-0096
pISSN - 0091-2751
DOI - 10.1002/jcu.1870010110
Subject(s) - medicine , supine position , contractility , systole , ventricle , cardiology , cardiac cycle , contraction (grammar) , ultrasound , rest (music) , diastole , radiology , blood pressure
A new, standardized, ultrasound cardiographic technique — CED — is evaluated in four healthy subjects during rest and during graded cycling (supine). The myocardial contraction displacement(s) of an easily recognized area of the posterior wall of the left ventricle was recorded (s(t)‐curves). On line differentiators were developed to differentiate the s(t)‐curves, hereby providing the velocity (V̇ = ds/dt) and acceleration (Ä = d 2 s/dt 2 ) of contraction. The positive velocity period, here called CED systole, was equal to the left ventricular ejection time at rest. The CED systole amounts to approximately 90% of the auscultatory systole at all levels of activity. The positive peak values of the first and second time derivatives of the s(t)‐curves are located almost constantly relative to the CED — and auscultatory — systolic durations at all exercise levels, confirming that the recordings were obtained from the same epicardial area at all examinations in each subject. The positive, peak velocity (V̇ 1 ) is possibly a sensitive estimate of the contractility of the superficial myocardial layer. The size of the CED‐variables were correlated with the steady state work rate of each subject. The CED‐examination was practicable even during heavy, supine exercise.