scholarly journals Regional dynamics of fractal dimension of the left ventricular endocardium from cine computed tomography images

2019 ◽  
Author(s):  
Ashish Manohar ◽  
Lorenzo Rossini ◽  
Gabrielle Colvert ◽  
Davis M. Vigneault ◽  
Francisco Contijoch ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Radial Strain ◽  
Principal Component ◽  
Heart Association ◽  
Normal Subjects ◽  
Unsupervised Classification ◽  
Left Ventricular ◽  
Free Wall ◽  
Regional Left Ventricular Function ◽  
Computed Tomography Images

AbstractWe present a method to leverage the high fidelity of CT to quantify regional left ventricular function using topography variation of the endocardium as a surrogate measure of strain. 4DCT images of 10 normal and 10 abnormal subjects, acquired with standard clinical protocols, were used. The topography of the endocardium was characterized by its regional values of fractal dimension (FD), computed using a box-counting algorithm developed in-house. The average FD in each of the 16 American Heart Association segments was calculated for each subject as a function of time over the cardiac cycle. The normal subjects showed a peak systolic percentage change in FD of 5.9% ± 2% in all free-wall segments, while the abnormal cohort experienced a change of 2% ± 1.2% (p < 0.00001). Septal segments, being smooth, did not undergo large changes in FD. Additionally, a principal component analysis was performed on the temporal profiles of FD to highlight the possibility for unsupervised classification of normal and abnormal function. The method developed is free from manual contouring and does not require any feature tracking or registration algorithms. The FD values in the free wall segments correlated well with radial strain and with endocardial regional shortening measurements.

scholarly journals Ischaemia-modified albumin in dilated cardiomyopathy

2009 ◽  
Vol 46 (3) ◽  
pp. 241-243 ◽  
Author(s):  
Eftihia Sbarouni ◽  
Panagiota Georgiadou ◽  
Maria Koutelou ◽  
Ioannis Sklavainas ◽  
Demosthenes Panagiotakos ◽  
...  
Keyword(s):  
Heart Failure ◽  
Dilated Cardiomyopathy ◽  
Myocardial Necrosis ◽  
Heart Association ◽  
Normal Subjects ◽  
Left Ventricular ◽  
Left Ventricular Ejection ◽  
Control Group ◽  
Ventricular Ejection Fraction ◽  
Significant Difference

Background Biomarkers of myocardial necrosis may be increased in patients with chronic heart failure. We investigated whether ischaemia-modified albumin (IMA), a marker of ischaemia, is also elevated in patients with compensated heart failure, due to dilated cardiomyopathy (DCM). Methods We studied 42 patients with DCM and an equal number of age-matched normal volunteers. We assessed IMA serum levels with the albumin cobalt binding test. Results IMA was 89.9 ± 13.1 (71–117) KU/L in the patient group and 93.9 ± 9.9 (76–122) KU/L in the control group, with no significant difference between the two ( P = 0.11). However, IMA differed significantly according to the New York Heart Association classification ( P = 0.003) and was negatively correlated with the left ventricular ejection fraction ( r = −0.40, P = 0.014). Conclusions We conclude that IMA, a marker of ischaemia, does not differ in patients with clinically stable DCM compared with normal subjects, but varies significantly in relation to the severity of the disease.

Regional differences in LV collagen accumulation and mature cross-linking after myocardial infarction in rats

1994 ◽  
Vol 266 (1) ◽  
pp. H354-H359 ◽  
Author(s):  
R. J. McCormick ◽  
T. I. Musch ◽  
B. C. Bergman ◽  
D. P. Thomas
Keyword(s):  
Myocardial Infarction ◽  
Regional Differences ◽  
Interventricular Septum ◽  
Principal Component ◽  
Left Ventricular ◽  
Viable Myocardium ◽  
Heart Weight ◽  
Cross Linking ◽  
Free Wall ◽  
Collagen Concentration

To determine the extent of and any regional differences in remodeling response of the extracellular matrix (ECM) to myocardial infarction (MI), moderate-to-large transmural infarcts were surgically produced in left ventricular (LV) free wall of rats. Animals were killed 13 wk after surgery. In comparison to age-matched controls, infarction was associated with an overall increase in heart weight, which included hypertrophy of both the right ventricle and LV. Although the remaining viable myocardium in LV free wall was significantly reduced, the interventricular septum was hypertrophied some 30% compared with control tissues (247 +/- 9 vs. 189 +/- 8 mg). Collagen concentration more than doubled in remaining viable free wall (8.92 +/- 0.59 vs. 3.95 +/- 0.25 mg/100 mg, P < 0.0001), and a smaller but still highly significant 27% increase occurred (P < 0.01) in the more remote septum. Degree of covalent cross-linking of collagen fibrils as assessed by hydroxylysylpyridinoline (HP) concentration also revealed regional differences in response of the ECM to infarction. Although HP concentration was increased 60% in viable free wall (P < 0.05) post-MI, it was unchanged in the septum. With respect to collagen characteristics of the transmural infarct per se, the scar exhibited still further increases in both collagen and HP concentrations compared with the already elevated values for these two parameters in viable free wall. The results indicate that any evaluation of the remodeling response of viable myocardium post-MI must include not only the myocyte but also the ECM, the principal component of which is collagen.

scholarly journals Regional dynamics of fractal dimension of the left ventricular endocardium from cine computed tomography images

2019 ◽  
Vol 6 (04) ◽  
pp. 1 ◽  
Author(s):  
Ashish Manohar ◽  
Lorenzo Rossini ◽  
Gabrielle Colvert ◽  
Davis M. Vigneault ◽  
Francisco Contijoch ◽  
...  
Keyword(s):  
Computed Tomography ◽  
Fractal Dimension ◽  
Left Ventricular ◽  
Computed Tomography Images ◽  
Regional Dynamics

Abstract 2938: Decrease in Endocardial Radial Strain Precedes Global Left Ventricular Dysfunction in Patients With Hypertension.

Circulation ◽  
2007 ◽  
Vol 116 (suppl_16) ◽  
Author(s):  
Kazuhisa Nishimura ◽  
Hideki Okayama ◽  
Makoto Saito ◽  
Toyofumi Yoshii ◽  
Katsuji Inoue ◽  
...  
Keyword(s):  
Myocardial Dysfunction ◽  
Radial Strain ◽  
Normal Subjects ◽  
Left Ventricular ◽  
Lv Dysfunction ◽  
Lv Mass ◽  
Significant Difference ◽  
The Difference ◽  
Independent Assessment ◽  
Axis View

Background: Recent studies have reported that endocardial radial strain was approximately two fold greater than epicardial strain in normal subjects. Hypertension is a major cause of myocardial dysfunction and heart failure, but the difference between endocardial and epicardial radial strain in patients with hypertension is unknown. Two-dimensional speckle tracking echocardiography is a novel echocardiographic method that enables angle-independent assessment. Aim: The aim of this study was to evaluate the difference between radial strain in endocardial and epicardial segments in hypertensive patients. Method: This study enrolled 37 patients with hypertension (H group, age 63±12years, 24men) and 17 sex- and age-matched normal subjects (N group, age 61±7 years, 9 men). Conventional echocardiography was performed by a Vivid 7 dimension (GE). Endocardial and epicardial radial strains were calculated from the left ventricular (LV) short axis view at the papillary muscle level using custom software (EchoPAC (GE)). Results: There were no significant differences in LV diastolic dimension (47±5 mm vs. 48±4 mm), LV systolic dimension (29±4 mm vs. 29±4 mm), LV ejection fraction (65±9% vs. 67±6%) and fractional shortening (38±5% vs. 39±5%) between the H and N group. LV mass index (LVMI) in the H group was significantly greater than in the N group (109±33g/m2 vs. 90±22g/m2, P<0.05). Global radial strain including endocardium and epicardium were not significantly different between the H and N group (59±20% vs. 62±17%). However, endocardial radial strain in the H group was significantly less than in the N group (48±24% vs. 62±15%, P=0.03), whereas there was no significant difference in epicardial radial strain between the two groups (38±16% vs. 28±10%). The ratio of endocardial to epicardial radial strain (Endo/Epi ratio) in the H group was significantly smaller than in the N group (1.5±1.1 vs. 2.4±1.1, P<0.01). There were significant correlations between End/Epi ratio and LVMI (r=-0.33, P<0.05), and relative wall thickness (r=-0.43, P<0.01). Conclusion: A decrease in endocardial radial strain precedes global LV dysfunction in patients with hypertension.

scholarly journals Comparison of global and regional myocardial strains in patients with heart failure with a preserved ejection fraction vs hypertension vs age-matched control

2020 ◽  
Vol 18 (1) ◽  
Author(s):  
Hyung Yoon Kim ◽  
Sung-Ji Park ◽  
Sang-Chol Lee ◽  
Shin Yi Chang ◽  
Eun-Kyoung Kim ◽  
...  
Keyword(s):  
Heart Failure ◽  
Ejection Fraction ◽  
Strain Rate ◽  
Speckle Tracking ◽  
Speckle Tracking Echocardiography ◽  
Radial Strain ◽  
Normal Subjects ◽  
Left Ventricular ◽  
Preserved Ejection Fraction ◽  
Strain And Strain Rate

Abstract Background With an increasing clinical importance of the treatment of the heart failure (HF) with preserved ejection fraction (HFpEF), it is important to be certain of the diagnosis of HF. We investigated global and regional left ventricular (LV) strains using speckle tracking echocardiography (STE) in patients with HFpEF and compared those parameters with that of patients with hypertension and normal subjects. Methods Peak longitudinal, circumferential and radial strains were assessed globally and regionally for each study groups using STE. Diastolic strain rate was also determined. Results There were 50 patients in HFpEF group, 56 patients in hypertension group and 46 age-matched normal subjects. In patients with HFpEF, global peak longitudinal, circumferential and radial strain and strain rate were reduced compared to both hypertension patients and normal controls (− 15.5 ± 5.3 vs − 17.7 ± 3.1 and − 19.9 ± 2.0; − 9.7 ± 2.2 vs − 19.3 ± 3.1 and − 20.5 ± 3.3; 17.7 ± 8.2 vs 38.4 ± 12.4 and 43.6 ± 11.9, respectively, P <  0.001, for all). The diagnostic performance of global circumferential strain to predict the HFpEF was greatest among strain parameters (area under the curve = 0.997). Conclusions In the speckle tracking echocardiography, impaired peak global strain and homogeneously reduced regional strain was observed in HFpEF patients compared to the hypertension patients and normal subjects in decreasing order. This can provide early information on the initiation of LV deformation of HFpEF in patients with hypertension or normal subjects.

Intracellular EDEMA does not adversely affect the ability to cryopreserve intact hearts

1993 ◽  
Vol 51 ◽  
pp. 278-279
Author(s):  
CL Hastings ◽  
RD Carlton ◽  
FG Lightfoot ◽  
AF Tryka
Keyword(s):  
Cell Injury ◽  
Median Sternotomy ◽  
Left Ventricular ◽  
Ventricular Free Wall ◽  
Hypoxic Cell ◽  
Free Wall ◽  
Sprague Dawley ◽  
Left Ventricular Free Wall ◽  
Sprague Dawley Rats

The earliest ultrastructural manifestation of hypoxic cell injury is the presence of intracellular edema. Does this intracellular edema affect the ability to cryopreserve intact myocardium? To answer this guestion, a model for anoxia induced intracellular edema (IE) was designed based on clinical intraoperative myocardial preservation protocol. The aortas of 250 gm male Sprague-Dawley rats were cannulated and a retrograde flush of Plegisol at 8°C was infused over 90 sec. The hearts were excised and placed in a 28°C bath of Lactated Ringers for 1 h. The left ventricular free wall was then sliced and the myocardium was slam frozen. Control rats (C) were anesthetized, the hearts approached by median sternotomy, and the left ventricular free wall frozen in situ immediately after slicing. The slam frozen samples were obtained utilizing the DDK PS1000, which was precooled to -185°C in liguid nitrogen. The tissue was in contact with the metal mirror for a dwell time of 20 sec, and stored in liguid nitrogen until freeze dry processing (Lightfoot, 1990).

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