Correlation of heart rate and radionuclide index of left ventricular contraction and relaxation

1990 ◽  
Vol 4 (3) ◽  
pp. 95-100
Author(s):  
Haruhiko Adachi ◽  
Hiroki Sugihara ◽  
Hiroaki Nakagawa ◽  
Suetsugu Inagaki ◽  
Yasushi Kubota ◽  
...  
Keyword(s):  
Heart Rate ◽  
Left Ventricular ◽  
Ventricular Contraction ◽  
Contraction And Relaxation

Depressant effects of quinidine gluconate on left ventricular contraction and relaxation in consious dogs with volume overload

1978 ◽  
Vol 41 (2) ◽  
pp. 416
Author(s):  
Robert Engler ◽  
Martin LeWinter ◽  
Linda Van Nyhuis ◽  
Rodney Kaiser ◽  
Joel Karliner
Keyword(s):  
Volume Overload ◽  
Left Ventricular ◽  
Ventricular Contraction ◽  
Contraction And Relaxation

HYPOVOLEMIA DOES NOT AFFECT SPEED OF ISOVOLUMIC LEFT VENTRICULAR CONTRACTION AND RELAXATION IN EXCISED CANINE HEART

Shock ◽  
2007 ◽  
pp. 1 ◽  
Author(s):  
Ju Mizuno ◽  
Juichiro Shimizu ◽  
Satoshi Mohri ◽  
Junichi Araki ◽  
Kazuo Hanaoka ◽  
...  
Keyword(s):  
Left Ventricular ◽  
Canine Heart ◽  
Ventricular Contraction ◽  
Contraction And Relaxation

Assessment of the longitudinal and circumferential left ventricular function at rest and during exercise in healthy elderly individuals by tissue-Doppler echocardiography: relationship with heart rate

2004 ◽  
Vol 106 (5) ◽  
pp. 451-457 ◽  
Author(s):  
Miguel QUINTANA ◽  
Samir K. SAHA ◽  
Morteza ROHANI ◽  
Francesca DEL FURIA ◽  
Johanna BJERNBY ◽  
...  
Keyword(s):  
Heart Rate ◽  
Peak Velocity ◽  
Relaxation Times ◽  
Peak Systolic Velocity ◽  
Tissue Doppler ◽  
Left Ventricular ◽  
Short Axis ◽  
Elderly Individuals ◽  
Healthy Elderly ◽  
Contraction And Relaxation

Tissue-Doppler echocardiography (TDE) has been introduced to quantify stress echocardiography by means of assessing the left ventricular (LV) segmental myocardial velocities and excursion. The interaction between LV long- and short-axis function during physical exercise has not been elucidated completely. The aim of the present study was to investigate long- and short-axis LV function, as assessed by myocardial velocities and excursions at rest and during exercise and its possible relationship with heart rate in healthy elderly individuals by TDE. Twenty-seven individuals underwent an exercise test in the supine position on a bicycle ergometer. The initial workload was 30 Watts, followed by 20-Watt increments every third minute. Standard echocardiographic images with super-imposed colour TDE were digitized at the end of each step. The following variables were studied in the LV long- and short-axis: myocardial peak systolic velocity (PSV) and excursion, isovolumic contraction and relaxation times, peak velocity at early diastole (E´-wave) and peak velocity at late diastole (A´-wave) and the E´/A´ ratio. Increments in myocardial peak systolic velocity and excursion in the LV long-axis were more pronounced during low workloads. The increase in those variables in the short-axis occurred mainly at higher exercise loads. The improvement in LV long- and short-axis functions was closely related to the increase in the heart rate. Shortening of the isovolumic contraction and relaxation times occurred only at the initial stages of exercise. An increase in the long-axis E´/A´ ratio occurred during exercise, whereas this ratio was unchanged in the short-axis. In conclusion, during exercise, the LV long- and short-axis functions behave differently, and increases in LV long- and short-axis functions are related to changes in heart rate. Therefore, in the interpretation of echocardiographic findings during exercise stress echocardiography, these facts have to be taken into account.

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