scholarly journals A quantitative analysis of reservoir function of the human pulmonary "venous" system for the left ventricle.

1986 ◽  
Vol 50 (3) ◽  
pp. 222-231 ◽  
Author(s):  
MASAHIRO GOTO ◽  
MICHIO ARAKAWA ◽  
TAKAHIKO SUZUKI ◽  
TSUTOMU TANAKA ◽  
HIROMICHI MIYAMOTO ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Left Ventricle ◽  
Venous System ◽  
Reservoir Function

Noninvasive quantitative analysis of the left ventricle contractions with MR imaging

1990 ◽  
Author(s):  
P. Boesiger ◽  
G. McKinnon ◽  
O. Hess ◽  
H. P. Krayenbühl ◽  
S. E. Maier ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Left Ventricle ◽  
Mr Imaging

scholarly journals Differential modulation of right ventricular strain and right atrial mechanics in mild vs. severe pressure overload

2011 ◽  
Vol 301 (6) ◽  
pp. H2362-H2371 ◽  
Author(s):  
Rochus K. Voeller ◽  
Abdulhameed Aziz ◽  
Hersh S. Maniar ◽  
Nneka N. Ufere ◽  
Ajay K. Taggar ◽  
...  
Keyword(s):  
Left Ventricle ◽  
Myocardial Strain ◽  
Pressure Overload ◽  
Right Atrial ◽  
Compensatory Mechanisms ◽  
Right Heart ◽  
Reservoir Function ◽  
Tissue Tagging ◽  
Right Ventricular Strain ◽  
The Right

Increased right atrial (RA) and ventricular (RV) chamber volumes are a late maladaptive response to chronic pulmonary hypertension. The purpose of the current investigation was to characterize the early compensatory changes that occur in the right heart during chronic RV pressure overload before the development of chamber dilation. Magnetic resonance imaging with radiofrequency tissue tagging was performed on dogs at baseline and after 10 wk of pulmonary artery banding to yield either mild RV pressure overload (36% rise in RV pressure; n = 5) or severe overload (250% rise in RV pressure; n = 4). The RV free wall was divided into three segments within a midventricular plane, and circumferential myocardial strain was calculated for each segment, the septum, and the left ventricle. Chamber volumes were calculated from stacked MRI images, and RA mechanics were characterized by calculating the RA reservoir, conduit, and pump contribution to RV filling. With mild RV overload, there were no changes in RV strain or RA function. With severe RV overload, RV circumferential strain diminished by 62% anterior ( P = 0.04), 42% inferior ( P = 0.03), and 50% in the septum ( P = 0.02), with no change in the left ventricle ( P = 0.12). RV filling became more dependent on RA conduit function, which increased from 30 ± 9 to 43 ± 13% ( P = 0.01), than on RA reservoir function, which decreased from 47 ± 6 to 33 ± 4% ( P = 0.04), with no change in RA pump function ( P = 0.94). RA and RV volumes and RV ejection fraction were unchanged from baseline during either mild ( P > 0.10) or severe RV pressure overload ( P > 0.53). In response to severe RV pressure overload, RV myocardial strain is segmentally diminished and RV filling becomes more dependent on RA conduit rather than reservoir function. These compensatory mechanisms of the right heart occur early in chronic RV pressure overload before chamber dilation develops.

scholarly journals A Comparative Quantitative Analysis of the Postnatal Changes in the Myocardium of the Left and Right Ventricles in Rats

Folia Medica ◽  
2018 ◽  
Vol 60 (2) ◽  
pp. 226-233
Author(s):  
Alexandar A. Iliev ◽  
Georgi N. Kotov ◽  
Boycho V. Landzhov ◽  
Lazar S. Jelev ◽  
Iva N. Dimitrova ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Left Ventricle ◽  
Right Ventricle ◽  
Postnatal Development ◽  
Transverse Section ◽  
Morphometric Parameters ◽  
Cardiac Muscle Cells ◽  
Early Postnatal Development ◽  
Age Related ◽  
Left And Right

Abstract Background: The growth of the heart during the foetal and early postnatal development takes places mainly due to hyperplasia. The late postnatal development is characterised by cardiomyocytic hypertrophy in response to normal physiological mechanisms and increased load. To study the cell size most authors measure the diameter either directly or indirectly. Aim: The aim of the present study was to make a comparative quantitative analysis of the postnatal changes observed in the left and right ventricles in rat by evaluating the changes in three morphometric parameters – thickness of the free wall, transverse section of the cardiomyocytes and cardiomyocytic density in the left ventricle and right ventricle. Materials and methods: In the present study, we used histological material from the hearts of 15 male Wistar rats, distributed in five groups aged 2 weeks, 1 month, 3 months, 6 months and 12 months, respectively. Results: In both ventricles, the wall thickness and the transverse section of the cardiomyocytes increased with age, while the cardiomyocytic density decreased. Changes were identical in both ventricles; however, they were more dynamic and pronounced in the left ventricle. Conclusions: The studied morphometric parameters reveal that age-related hypertrophy and the gradual loss of cardiac muscle cells take place in both ventricles but have a more dynamic pattern of progression in the left ventricle as compared with the right ventricle.

scholarly journals Quantitative analysis of segmental wall motion throughout systole and diastole in the normal human left ventricle.

Circulation ◽  
1982 ◽  
Vol 65 (3) ◽  
pp. 580-590 ◽  
Author(s):  
S C Klausner ◽  
T J Blair ◽  
W F Bulawa ◽  
G M Jeppson ◽  
R L Jensen ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Left Ventricle ◽  
Wall Motion ◽  
Segmental Wall Motion ◽  
Segmental Wall ◽  
Normal Human ◽  
Human Left Ventricle

A quantitative analysis of the heterogeneity of blood flow to shall adjacent segments of the left ventricle

1975 ◽  
Vol 35 (1) ◽  
pp. 134
Author(s):  
James Ehrhardt ◽  
Melvin L. Marcus ◽  
Richard E. Kerber ◽  
Francois M. Abboud
Keyword(s):  
Blood Flow ◽  
Quantitative Analysis ◽  
Left Ventricle ◽  
Adjacent Segments
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