Duration of phases of left ventricular systole using indirect methods. I. Normal subjects.

Duration of phases of left ventricular systole using indirect methods. I. Normal subjects.

The duration of the various phases of left ventricular systole has been measured in a series of So normal subjects using high speed simultaneous recordings of the electrocardiogram, the phonocardiogram, the carotid pulse, and the apex cardiogram. The five phases of systole measured were: total electromechanical systole (Q-A2 interval); left ventricular ejection time (LVET); pre-ejection period ...

Duration of phases of left ventricular systole using indirect methods. II. Acute myocardial infarction.

Duration of the phases of left ventricular systole.

• The influence of heniodynamic variables on the duration of certain phases of ventricular systole has been studied by several investigators in intact animals and in isolated heart preparations.' Even in isolated hearts, it is not possible to change one heniodynainic variable without inducing changes in one or more intrinsic determinants of the heart's performance. For example, augmenting strok...

Duration of the Phases of Left Ventricular

• The influence of heniodynamic variables on the duration of certain phases of ventricular systole has been studied by several investigators in intact animals and in isolated heart preparations.' Even in isolated hearts, it is not possible to change one heniodynainic variable without inducing changes in one or more intrinsic determinants of the heart's performance. For example, augmenting strok...

The duration of left ventricular systole in mitral incompetence.

In mitral incompetence the left ventricle has two exits and it has been suggested that diminished resistance to emptying causes left ventricular systole to be shorter than normal (Brigden and Leatham, 1953). Theoretically the elevation of left ventricular end-diastolic pressure that is found in severe mitral incompetence (Ross et al., 1958; Nixon, 1961a) should result in prolongation of systole...