scholarly journals The diffeomorphism type of manifolds with almost maximal volume

2017 ◽  
Vol 25 (1) ◽  
pp. 243-267
Author(s):  
Curtis Pro ◽  
Michael Sill ◽  
Frederick Wilhelm
Keyword(s):  
Maximal Volume ◽  
Diffeomorphism Type

scholarly journals Interatrial block is related to atrial dysfunction in hypertensive subjects

2021 ◽  
Vol 22 (Supplement_1) ◽  
Author(s):  
L Tirapu Sola ◽  
F Loncaric ◽  
M Mimbrero ◽  
LG Mendieta ◽  
L Nunno ◽  
...  
Keyword(s):  
Global Longitudinal Strain ◽  
Female Gender ◽  
Left Ventricular ◽  
P Wave ◽  
P Value ◽  
Atrial Remodeling ◽  
Maximal Volume ◽  
Surface Ecg ◽  
Interatrial Block ◽  
And Function

Abstract Funding Acknowledgements Type of funding sources: Public grant(s) – National budget only. Main funding source(s): La Marató TV3 Background Interatrial block (IAB), a delay of conduction of the sinus stimulus from right to left atria (LA), is defined as surface ECG P-wave duration ≥120 ms. Arterial hypertension (AH) and IAB have been related to development of atrial fibrillation. Aim To investigate the IAB prevalence in a cohort of AH patients and relate it to LA function. Methods 162 patients with well-regulated AT were included. 12-lead ECG were performed and analysed with a digital caliper. 2D and 3D echocardiography were performed, and LA function assessed with speckle-tracking deformation imaging.  Results The median age was 56 ± 6 years, 54% were males. Average duration of AH was 10 ± 6 years. IAB was seen in 25% of AH patients.  The comparison between groups is shown in Table 1. There were no differences in demographic characteristics,  QRS complex duration (p = 0.179) or left ventricular (LV) size and function between subgroups. LA was enlarged in IAB patients, which was coupled with impairment of the LA reservoir strain.  Conclusion Our results show considerable prevalence of IAB in AH patients. The demonstrated LA enlargement and function impairment is not associated with LV dysfunction, therefore suggesting an independent role of IAB in atrial remodeling. Table 1 Interatrial block P value Yes (n= 40) No (n= 142) Age 59 (54-62) 57 (53-61) 0.157 Female gender 16 (40%) 58 (48%) 0.467 Duration of Hypertension (years) 10 (6-12) 8 (5-15) 0.421 Systolic blood pressure (mmHg) 136 (125-150) 136 (127-147) 0.799 Diabetes 3 (8%) 16 (13%) 0.410 LVEDV (mL) 73 (63-91) 71 (57-87) 0.424 E/A 0.98 (0.84-1.25) 0.94 (0.79-1.11) 0.230 E/e’ 7.0 (4.9-8.9) 6.6 (5.2-8.4) 0.779 LVEF (%) 63 ± 7 64 ± 6 0.864 LV global longitudinal strain (%) 21.22 ± 2.63 21.19 ± 2.30 0.932 3D LA maximal volume (mL/m2) 36 (30-39) 30 (26-37) 0.028 3D LA minimal volume (mL/m2) 16 (12-18) 14 (11-17) 0.050 LA reservoir strain (%) 27.64 (24.90-31.23) 29.55 (26.17-32.81) 0.032 LA conduit strain (%) 13.91 (10.71-15.47) 14.37 (11.75-16.72) 0.192 LA contractile strain (%) 14.46 (11.86-16.59) 15.52 (13.66-16.96) 0.079 LVEDV Left Ventricular End Dyastolic Volume

scholarly journals Distinct non-ischemic myocardial late gadolinium enhancement lesions in patients with type 2 diabetes

2020 ◽  
Vol 19 (1) ◽  
Author(s):  
Annemie Stege Bojer ◽  
Martin Heyn Sørensen ◽  
Niels Vejlstrup ◽  
Jens P. Goetze ◽  
Peter Gæde ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Late Gadolinium Enhancement ◽  
Left Ventricle ◽  
Stress Perfusion ◽  
Gadolinium Enhancement ◽  
Unique Identifier ◽  
Maximal Volume ◽  
Ischemic Lesion ◽  
Control Subjects

Abstract Background Cardiovascular magnetic resonance imaging (CMR) have described localised non-ischemic late gadolinium enhancement (LGE) lesions of prognostic importance in various non-ischemic cardiomyopathies. Ischemic LGE lesions are prevalent in diabetes (DM), but non-ischemic LGE lesions have not previously been described or systematically studied in DM. Methods 296 patients with type 2 DM (T2DM) and 25 sex-matched control subjects underwent echocardiography and CMR including adenosine-stress perfusion, T1-mapping and LGE. Results 264 patients and all control subjects completed the CMR protocol. 78.4% of patients with T2DM had no LGE lesions; 11.0% had ischemic LGE lesions only; 9.5% had non-ischemic LGE lesions only; and 1.1% had both one ischemic and one non-ischemic lesion. The non-ischemic LGE lesions were situated mid-myocardial in the basal lateral or the basal inferolateral part of the left ventricle and the affected segments showed normal to high wall thickness and normal contraction. Patients with non-ischemic LGE lesions in comparison with patients without LGE lesions had increased myocardial mass (150 ± 34 vs. 133 ± 33 g, P = 0.02), average E/e’(9.9 IQR8.7–12.6 vs. 8.8 IQR7.4–10.7, P = 0.04), left atrial maximal volume (102 IQR84.6–115.2 vs. 91 IQR75.2–100.0 mL, P = 0.049), NT-proBNP (8.9 IQR5.9–19.7 vs. 5.9 IQR5.9–10.1 µmol/L, P = 0.02) and high-sensitive troponin (15.6 IQR13.0–26.1 vs. 13.0 IQR13.0–14.6 ng/L, P = 0.007) and a higher prevalence of retinopathy (48 vs. 25%, P = 0.009) and autonomic neuropathy (52 vs. 30.5%, P = 0.005). Conclusion A specific LGE pattern with lesions in the basal lateral or the basal inferolateral part of the left ventricle was found in patients with type 2 diabetes. Trial registrationhttps://www.clinicaltrials.gov. Unique identifier: NCT02684331.

Effect of interstitial fluid (kerosene) on pressure-volume characteristics of rat lung

1982 ◽  
Vol 52 (1) ◽  
pp. 260-266 ◽  
Author(s):  
W. F. Urmey ◽  
S. M. Scharf ◽  
R. Brown ◽  
D. Carlson ◽  
P. Song
Keyword(s):  
Interstitial Fluid ◽  
Transpulmonary Pressure ◽  
Progressive Increase ◽  
Rat Lung ◽  
Interstitial Edema ◽  
Maximal Volume ◽  
Air Volume ◽  
Lung Expansion ◽  
Volume Characteristics ◽  
Alveolar Edema

Although pulmonary interstitial edema has been estimated to decrease pulmonary compliance (CL), it has been experimentally difficult to demonstrate whether the observed changes in CL are directly due to the presence of interstitial fluid or if they result instead from concomitant pulmonary vascular engorgement and/or alveolar edema. Since kerosene-inflated lungs do not leak, we were able to use kerosene to measure the effect on CL of the accumulation of interstitial fluid (kerosene) in the postmortem rat lung. Pressure-volume (PV) studies of the lung were done during the progressive increase in interstitial fluid (kerosene). Analysis of the deflation limbs of the quasistatic PV curves obtained following serial inflations with kerosene indicated that the maximal volume of kerosene [MV35, equal to the maximum tissue plus airway volume at a transpulmonary pressure (Ptp) of 35 cmH2O] was 3.8 +/- 1.2 ml (31.0 +/- 11.8%) greater than TLC35 [air volume at Ptp of 35 cmH2O prior to kerosene inflation]. The increases in interstitial kerosene volume had no effect on kerosene PV characteristics, as was demonstrated by superimposing lung PV curves obtained at various states of interstitial filling. We conclude that the interstitial compartment is large and very compliant and that the presence of even great amounts of fluid limited to this compartment does not restrict lung expansion.

Relation of Left Atrial Maximal Volume Measured by Real-Time 3D Echocardiography to Demographic, Clinical, and Doppler Variables

2008 ◽  
Vol 101 (9) ◽  
pp. 1347-1352 ◽  
Author(s):  
Stefano De Castro ◽  
Stefano Caselli ◽  
Emanuele Di Angelantonio ◽  
Sara Del Colle ◽  
Francesca Mirabelli ◽  
...  
Keyword(s):  
Real Time ◽  
Left Atrial ◽  
3D Echocardiography ◽  
Maximal Volume

Maximal Volume Decomposition and its Application to Feature Recognition

1995 ◽  
Author(s):  
Parag Dave ◽  
Hiroshi Sakurai
Keyword(s):  
Decomposition Method ◽  
Feature Recognition ◽  
Graph Matching ◽  
Raw Material ◽  
Maximal Volume ◽  
Object A ◽  
Finished Part ◽  
Volume Decomposition ◽  
Minimal Cells ◽  
Volume Difference

Abstract A method has been developed that decomposes an object having both planar and curved faces into volumes, called maximal volumes, using the halfspaces of the object. A maximal volume has as few concave edges as possible without introducing additional halfspaces. The object is first decomposed into minimal cells by extending the faces of the object. These minimal cells are then composed to form maximal volumes. The combinations of such minimal cells that result in maximal volumes are searched efficiently by examining the relationships among those minimal cells. With this decomposition method, a delta volume, which is the volume difference between the raw material and the finished part, is decomposed into maximal volumes. By subtracting maximal volumes from each other in different orders and applying graph matching to the resulting volumes, multiple interpretations of features can be generated.

scholarly journals Which is the Best Measure of Left Atrial Size Following Myocardial Infarction: Minimal or Maximal Volume? Insights from Prognostic and Haemodynamic Validation

2019 ◽  
Vol 28 ◽  
pp. S278-S279
Author(s):  
S. Prasad ◽  
K. Guppy-Coles ◽  
T. Stanton ◽  
R. Krishnaswamy ◽  
J. Armstrong ◽  
...  
Keyword(s):  
Myocardial Infarction ◽  
Left Atrial ◽  
Left Atrial Size ◽  
Maximal Volume ◽  
Atrial Size

Stability and Optimization of a Pressure-Loaded Trapezoidal Vault with Semi-Rigid Joints

2019 ◽  
Vol 20 (01) ◽  
pp. 2071001
Author(s):  
C. Y. Wang
Keyword(s):  
Critical Pressure ◽  
Base Length ◽  
Maximal Volume ◽  
Boundary Length ◽  
Rigid Joints

The critical pressure is determined for a trapezoidal vault with rigid members and semi-rigid joints. For maximal volume enclosed per boundary length, it is found that the critical pressure is highest when the vault symmetrical, with top three pieces 39.64% of the base length. The upper two joints should also be heavily strengthened.

Sign in / Sign up

Export Citation Format

Share Document