The influence of medium elasticity on the prediction of histotripsy-induced bubble expansion and erythrocyte viability.

In this study, an analytic model to predict histotripsy-induced bubble expansion in a fluid was extended to include the effects of medium elasticity. Good agreement was observed between the predictions of the analytic model and numerical computations utilizing highly nonlinear excitations (shock-scattering histotripsy) and purely tensile pulses (microtripsy). No bubble expansion was computed for either form of histotripsy when the elastic modulus was greater than 20 MPa and the peak negative pressure was less than 50 MPa. Strain in the medium due to the expansion of a single bubble was also tabulated. The viability of red blood cells was calculated as a function of distance from the bubble wall based on empirical data of impulsive stretching of erythrocytes. Red blood cells remained viability at distances further than 44 m from the bubble wall. As the medium elasticity increased, the distance over which bubble expansion-induced strain influenced red blood cells was found to decrease sigmoidally. These results highlight the relationship between tissue elasticity and the efficacy of histotripsy. In addition, an upper medium elasticity limit was identified, above which histotripsy may not be effective for tissue liquefaction. PMID: 29553049 [PubMed - as supplied by publisher]
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research

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Authors: Ruiz Rebollo ML, González Obeso E, Burgueño Gómez B, Santos Fernández J Abstract A 75-year-old male was referred due to dysphagia and iron-deficiency anemia. An upper endoscopy was performed which revealed a friable mass at 30 to 37 cm from the incisors, consistent with esophageal malignancy. However, the pathology only demonstrated granulation inflammatory tissue. An endoscopic ultrasound exam showed a 2-3 cm esophageal wall thickening with a 1.5 cm lymph node, which was staged as a T2-3 N1 esophageal tumor. A CT-scan also identified a 7.5 cm esophageal malignancy surrounded by...
Source: Revista Espanola de Enfermedades Digestivas - Category: Gastroenterology Tags: Rev Esp Enferm Dig Source Type: research
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Source: LWT Food Science and Technology - Category: Food Science Source Type: research
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Source: Frontiers in Endocrinology - Category: Endocrinology Source Type: research
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Source: Journal of Medical Case Reports - Category: General Medicine Source Type: research
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Source: Pharmaceutical Medicine - Category: Drugs & Pharmacology Source Type: research
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Source: International Heart Journal - Category: Cardiology Tags: Int Heart J Source Type: research
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Source: Academic Radiology - Category: Radiology Source Type: research
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Source: Headlines - Category: Radiology Source Type: news
Conditions:   Pleural Effusion;   Dyspnea;   Patient Reported Outcomes;   Diaphragm Movement;   Ultrasound Intervention:   Other: Assesment of diaphragm shape and diaphragm movement (by M-mode and the AREA-method) by ultrasound before and after thoracentesis Sponsor:   Naestved Hospital Recruiting
Source: - Category: Research Source Type: clinical trials
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