scholarly journals Rapid Prototyping 3D Model for PIV: Application in Human Trachea Model Flow Analysis

2021 ◽  
Vol 79 (2) ◽  
pp. 65-73
Author(s):  
Zuliazura Mohd Salleh ◽  
Kahar Osman ◽  
Mohd Fairuz Marian ◽  
Nik Normunira Mat Hassan ◽  
Rais Hanizam Madon ◽  
...  
Keyword(s):  
Rapid Prototyping ◽  
3D Model ◽  
Flow Analysis ◽  
Left Lung ◽  
Velocity Magnitude ◽  
Model Flow ◽  
Image Velocimetry ◽  
Human Trachea ◽  
Experimental Works ◽  
The Right

Experimental works for analysing flow behaviour inside human trachea has become continuous problem as the model used to study cannot imitate the real geometry of human trachea structure. As the technology develop, Rapid Prototyping (RP) become more useful in constructing the 3D model that has complexity in their geometries. RP not only offer several technologies in developing the 3D model, but also varies type of materials that can be used to manufacture the 3D model. In this study, RP technique was chosen to develop the 3D model of human trachea to do the Particle Image Velocimetry (PIV) experimental works. Material used was Vero Clear due to PIV need a model that transparent so that visualization on flow inside the model can be seen and the velocity magnitude can be capture. The geometry was adapted from 60 years old trachea patient where the images of trachea was taken by using CT-scan. MIMICS software was used to extracted the images before reconstruct the trachea into 3D model. Velocity distribution was visualized and the magnitude were taken at both left and right bronchi. From the analysis, it concluded that the distribution of airflow to the second generation of trachea was 60:40 to right and left bronchi. It follows the rules as the right bronchi need to supply more air to the right lung compared to left as the volume of right lung bigger that left lung.

CASE REPORT: SURGICAL MANAGEMENT OF LUMBAR COMPRESSION FRACTURE

2019 ◽  
Vol 1 (4) ◽  
Author(s):  
Yustinus Robby Budiman Gondowardojo ◽  
Tjokorda Gde Bagus Mahadewa
Keyword(s):  
Spinal Cord ◽  
Left Lung ◽  
Lumbar Vertebrae ◽  
Compression Fracture ◽  
High Mobility ◽  
Early Mobilization ◽  
Cord Injury ◽  
Cardiothoracic Surgeon ◽  
The Right

The lumbar vertebrae are the most common site for fracture incident because of its high mobility. The spinal cord injury usually happened as a result of a direct traumatic blow to the spine causing fractured and compressed spinal cord. A 38-year-old man presented with lumbar spine’s compression fracture at L2 level. In this patient, decompression laminectomy, stabilization, and fusion were done by posterior approach. The operation was successful, according to the X-Ray and patient’s early mobilization. Pneumothorax of the right lung and pleural effusion of the left lung occurred in this patient, so consultation was made to a cardiothoracic surgeon. Chest tube and WSD insertion were performed to treat the comorbidities. Although the patient had multiple trauma that threat a patient’s life, the management was done quickly, so the problems could be solved thus saving the patient’s life. After two months follow up, the patient could already walk and do daily activities independently.

RARE CASE OF NODULAR LYMPHOID HYPERPLASIA OF LEFT LUNG IN THE PATIENT WITH PREVIOUS PULMONARY TUBERCULOSIS

2018 ◽  
Vol 40 (4) ◽  
pp. 332-335
Author(s):  
P V Kuzyk ◽  
M A Savchyna ◽  
S G Gychka
Keyword(s):  
Pulmonary Tuberculosis ◽  
Lymphoproliferative Disorder ◽  
Clinical Laboratory ◽  
Left Lung ◽  
Lymphoid Hyperplasia ◽  
Morphological Examination ◽  
Nodular Lymphoid Hyperplasia ◽  
Lymph Nodes Dissection ◽  
The Right ◽  
Immunohistochemical Studies

Aim: To describe the case of rare benign lymphoproliferative disorder — pulmonary nodular lymphoid hyperplasia in the patient with previous pulmonary tuberculosis. Materials and Methods: In the case of pulmonary nodular lymphoid hyperplasia clinical, laboratory, instrumental and morphological examination was performed. Results: 44-year-old woman in 7 years after successfully treated infiltrative drug-susceptible tuberculosis of the right lung, was hospitalized with a suspected tumor of the left lung root. The patient underwent left-sided pneumonectomy with lymph nodes dissection. The results of histopathological and immunohistochemical studies evidenced on nodular lymphoid hyperplasia of the left lung. Conclusion: Pulmonary nodular lymphoid hyperplasia is a rare lymphoproliferative disorder of the lung with favorable prognosis. For the purpose of differential diagnosis, it is necessary to apply immunohistochemistry.

PIV Validation of Blood-heart Valve Leaflet Interaction Modelling

2007 ◽  
Vol 30 (7) ◽  
pp. 640-648 ◽  
Author(s):  
R. Kaminsky ◽  
K. Dumont ◽  
H. Weber ◽  
M. Schroll ◽  
P. Verdonck
Keyword(s):  
Shear Stress ◽  
Heart Valve ◽  
Cfd Simulation ◽  
Flow Simulation ◽  
Data Sets ◽  
Arbitrary Lagrangian Eulerian ◽  
Velocity Magnitude ◽  
Image Velocimetry ◽  
Interaction Modelling ◽  
In Series

The aim of this study was to validate the 2D computational fluid dynamics (CFD) results of a moving heart valve based on a fluid-structure interaction (FSI) algorithm with experimental measurements. Firstly, a pulsatile laminar flow through a monoleaflet valve model with a stiff leaflet was visualized by means of Particle Image Velocimetry (PIV). The inflow data sets were applied to a CFD simulation including blood-leaflet interaction. The measurement section with a fixed leaflet was enclosed into a standard mock loop in series with a Harvard Apparatus Pulsatile Blood Pump, a compliance chamber and a reservoir. Standard 2D PIV measurements were made at a frequency of 60 bpm. Average velocity magnitude results of 36 phase-locked measurements were evaluated at every 10° of the pump cycle. For the CFD flow simulation, a commercially available package from Fluent Inc. was used in combination with in-house developed FSI code based on the Arbitrary Lagrangian-Eulerian (ALE) method. Then the CFD code was applied to the leaflet to quantify the shear stress on it. Generally, the CFD results are in agreement with the PIV evaluated data in major flow regions, thereby validating the FSI simulation of a monoleaflet valve with a flexible leaflet. The applicability of the new CFD code for quantifying the shear stress on a flexible leaflet is thus demonstrated. (Int J Artif Organs 2007; 30: 640–8)

scholarly journals Ventilation/perfusion mismatch during lung aeration at birth

2014 ◽  
Vol 117 (5) ◽  
pp. 535-543 ◽  
Author(s):  
Justin A. R. Lang ◽  
James T. Pearson ◽  
Arjan B. te Pas ◽  
Megan J. Wallace ◽  
Melissa L. Siew ◽  
...  
Keyword(s):  
Pulmonary Arteries ◽  
Left Lung ◽  
X Ray ◽  
Lung Aeration ◽  
X Ray Imaging ◽  
Iodine Level ◽  
Pulmonary Shunting ◽  
Left And Right ◽  
Near Term ◽  
The Right

At birth, the transition to newborn life is triggered by lung aeration, which stimulates a large increase in pulmonary blood flow (PBF). Current theories predict that the increase in PBF is spatially related to ventilated lung regions as they aerate after birth. Using simultaneous phase-contrast X-ray imaging and angiography we investigated the spatial relationships between lung aeration and the increase in PBF after birth. Six near-term (30-day gestation) rabbits were delivered by caesarean section, intubated and an intravenous catheter inserted, before they were positioned for X-ray imaging. During imaging, iodine was injected before ventilation onset, after ventilation of the right lung only, and after ventilation of both lungs. Unilateral ventilation increased iodine levels entering both left and right pulmonary arteries (PAs) and significantly increased heart rate, iodine ejection per beat, diameters of both left and right PAs, and number of visible vessels in both lungs. Within the 6th intercostal space, the mean gray level (relative measure of iodine level) increased from 68.3 ± 11.6 and 70.3 ± 7.5%·s to 136.3 ± 22.6 and 136.3 ± 23.7%·s in the left and right PAs, respectively. No differences were observed between vessels in the left and right lungs, despite the left lung not initially being ventilated. The increase in PBF at birth is not spatially related to lung aeration allowing a large ventilation/perfusion mismatch, or pulmonary shunting, to occur in the partially aerated lung at birth.

Abstract 12430: Vicious Circle Between Progressive Right Ventricular Dilatation and Pulmonary Regurgitation in Patients After Tetralogy of Fallot Repair? Right Heart Enlargement Promotes Flow Reversal in the Left Pulmonary Artery

Circulation ◽  
2015 ◽  
Vol 132 (suppl_3) ◽  
Author(s):  
Atsuko Kato ◽  
Christian Drolet ◽  
Shi-Joon Yoo ◽  
Andrew Redington ◽  
Lars Grosse-Wortmann
Keyword(s):  
Pulmonary Artery ◽  
Tetralogy Of Fallot ◽  
Left Lung ◽  
Pulmonary Regurgitation ◽  
Left Pulmonary Artery ◽  
Flow Reversal ◽  
Left Hemithorax ◽  
Forward Flow ◽  
Lung Area ◽  
The Right

Introduction: The left pulmonary artery (LPA) contributes more than the right (RPA) to total pulmonary regurgitation (PR) in patients after tetralogy of Fallot (TOF) repair, but the mechanism of this difference is not well known. We hypothesized that unilaterally increased pulmonary vascular resistance (PVR), resulting from lung compression by the enlarged and levorotated heart leads to greater PR in the LPA. This study aimed to analyze the interplay between heart and lung size, mediastinal geometry, and differential PR. Methods: This is a single-center retrospective analysis of 50 magnetic resonance studies in patients after TOF repair. Patients with more than mild discrete branch pulmonary artery stenosis were excluded. Blood flow was measured by phase-contrast velocity encoding within the branch pulmonary arteries. On the axial image with the largest total cardiac surface area, cardiac angle (α) between the thoracic anterior-posterior line and the interventricular septum, right and left lung areas as well as right and left hemithorax areas were measured (Figure). Results: There was no difference in LPA and RPA diameters. The LPA showed significantly less total forward flow (p=0.04), smaller net forward flow (p=<0.001), and greater RF (p=0.001) than the RPA. Left lung area was smaller than the right (p<0.001). RVEDVi correlated with LPA RF (R=0.48, p<0.001), but not with RPA RF. Larger RVEDVi correlated with a larger α angle (R=0.46, p<0.001), i.e. a more leftward cardiac axis and with smaller left lung area (R=-0.58, p<0.001). LPA RF, but not RPA RF, correlated inversely with left lung area indexed to the left hemithorax area (R=-0.34, p=0.02). Conclusions: An enlarged and levorotated heart - as a result of PR - is associated with smaller left lung size, and augments diastolic flow reversal in the LPA, presumably via increased left PVR. By imposing a further volume load on the RV, LPA regurgitation may thus close a positive feed-back loop of PR and RV dilatation.

scholarly journals Comorbidity between Klinefelter syndrome and diaphragmatic hernia. A case report

2014 ◽  
Vol 132 (5) ◽  
pp. 311-313
Author(s):  
Carolina Melendez Valdez ◽  
Stephan Philip Leonhardt Altmayer ◽  
Adyr Eduardo Virmond Faria ◽  
Aline Weiss ◽  
Jorge Alberto Bianchi Telles ◽  
...  
Keyword(s):  
Diaphragmatic Hernia ◽  
Ultrasound Examination ◽  
Klinefelter Syndrome ◽  
Age Groups ◽  
Left Lung ◽  
Left Lobe ◽  
Imaging Studies ◽  
Left Hemithorax ◽  
Prenatal Imaging ◽  
The Right

CONTEXT: Intrathoracic cystic lesions have been diagnosed in a wide variety of age groups, and the increasing use of prenatal imaging studies has allowed detection of these defects even in utero.CASE REPORT: A 17-year-old pregnant woman in her second gestation, at 23 weeks of pregnancy, presented an ultrasound with evidence of a cystic anechoic image in the fet al left hemithorax. A morphological ultrasound examination performed at the hospital found that this cystic image measured 3.7 cm x 2.1 cm x 1.6 cm. Polyhydramnios was also present. At this time, the hypothesis of cystic adenomatoid malformation was raised. Fet al echocardiography showed only a dextroposed heart. Fet al magnetic resonance imaging produced an image compatible with a left diaphragmatic hernia containing the stomach and at least the first and second portions of the duodenum, left lobe of the liver, spleen, small intestine segments and portions of the colon. The stomach was greatly distended and the heart was shifted to the right. There was severe volume reduction of the left lung. Fet al karyotyping showed the chromosomal constitution of 47,XXY, compatible with Klinefelter syndrome. In our review of the literature, we found only one case of association between Klinefelter syndrome and diaphragmatic hernia.CONCLUSIONS: We believe that the association observed in this case was merely coincidental, since both conditions are relatively common. The chance of both events occurring simultaneously is estimated to be 1 in 1.5 million births.

scholarly journals AN ATHEROSCLEROTIC CORONARY ARTERY PHANTOM FOR PARTICLE IMAGE VELOCIMETRY

2011 ◽  
Author(s):  
Jean Brunette ◽  
Rosaire Mongrain ◽  
Rosaire Mongrain ◽  
Adrian Ranga ◽  
Adrian Ranga ◽  
...  
Keyword(s):  
Experimental Data ◽  
Particle Image Velocimetry ◽  
Heart Attack ◽  
Computational Models ◽  
Particle Image ◽  
Flow Analysis ◽  
Novel Technique ◽  
Image Velocimetry ◽  
Inflammatory Processes ◽  
Injection Molded

Myocardial infarction, also known as a heart attack, is the single leading cause of death in North America. It results from the rupture of an atherosclerotic plaque, which occurs in response to both mechanical stress and inflammatory processes. In order to validate computational models of atherosclerotic coronary arteries, a novel technique for molding realistic compliant phantom featuring injection-molded inclusions and multiple layers has been developed. This transparent phantom allows for particle image velocimetry (PIV) flow analysis and can supply experimental data to validate computational fluid dynamics algorithms and hypothesis.

Effect of a regional increase in alveolar pressure on pulmonary blood flow

1992 ◽  
Vol 73 (4) ◽  
pp. 1291-1296 ◽  
Author(s):  
L. E. Olson ◽  
R. L. Wardle
Keyword(s):  
Blood Flow ◽  
Pulmonary Blood Flow ◽  
Left Lung ◽  
Dry Weight ◽  
Test Lung ◽  
Test Segment ◽  
Control Segment ◽  
Lung Segment ◽  
Lung Blood Flow ◽  
The Right

We examined whether wedging a catheter (0.5 cm OD) into a subsegmental airway in dog (n = 6) or pig lungs (n = 5) and increasing pressure in the distal lung segment affected pulmonary blood flow. Dogs and pigs were anesthetized and studied in the prone position. Pulmonary blood flow was measured by injecting radiolabeled microspheres (15 microns diam) into the right atrium when airway pressure (Pao) was 0 cmH2O and pressure in the segment distal to the wedged catheter (Ps) was 0, 5, or 15 cmH2O and when Pao = Ps = 15 cmH2O. The lungs were excised, air-dried, and sectioned. Blood flow per gram dry weight normalized to cardiac output to the right or left lung, as appropriate, was calculated for the test segment, a control segment in the opposite lung corresponding anatomically to the test segment, the remainder of the lung containing the test segment (test lung), and the remainder of the lung containing the control segment (control lung). The presence of the catheter reduced blood flow in the test segment compared with that in the control segment and in the test lung. Blood flow was not affected by increasing pressure in the test segment. We conclude that, in studies designed to measure collateral ventilation in dog lungs, the presence of the wedged catheter is likely to have a greater effect on blood flow than the increase in pressure associated with measuring collateral airway resistance.

Effect of pulmonary artery occlusion and reperfusion on extravascular fluid accumulation

1981 ◽  
Vol 50 (1) ◽  
pp. 102-106 ◽  
Author(s):  
P. S. Barie ◽  
T. S. Hakim ◽  
A. B. Malik
Keyword(s):  
Pulmonary Artery ◽  
Water Content ◽  
Left Atrial ◽  
Left Lung ◽  
Weight Ratio ◽  
Dry Weight ◽  
Left Pulmonary Artery ◽  
Artery Occlusion ◽  
Lung Water ◽  
The Right

We determined the effect of pulmonary hypoperfusion on extravascular water accumulation in anesthetized dogs by occluding the left pulmonary artery for 3 h and then reperfusing it for 24 h. The lung was reperfused either at normal left atrial pressure (Pla) or during increased Pla induced by a left atrial balloon. In each case the extravascular water content-to-bloodless dry weight ratio (W/D) of the left lung was compared with that of the right lung. The W/D of the left lung of 3.26 +/- 0.49 ml/g was not significantly different from the value of 2.87 +/- 0.37 for the right lung after the reperfusion at normal Pla. However, the W/D of the left lung of 5.10 +/- 0.38 ml/g was greater (P less than 0.05) than the value of 4.42 +/- 0.34 for the right lung after reperfusion at Pla of 25 Torr. This difference could not be prevented by pretreatment with heparin, suggesting that the increase in lung water content was not due to activation of intravascular coagulation secondary to stasis occurring during the occlusion. Because the left lung was more edematous than the right one, even though both lungs had been subjected to the same increase in Pla, the results suggest that a period of pulmonary hypoperfusion causes an increase in the interstitial protein concentration.

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