The gallbladder(GB)is a susceptible organ,prone to various pathologies that can be identified using different imaging techniques.Transabdominal ultrasound(TUS)is typically the initial diagnostic method due to its nume...The gallbladder(GB)is a susceptible organ,prone to various pathologies that can be identified using different imaging techniques.Transabdominal ultrasound(TUS)is typically the initial diagnostic method due to its numerous well-established advantages.However,in cases of uncertainty or when a definitive diagnosis cannot be established,computed tomography(CT)or magnetic resonance imaging may be employed to provide more detailed information.Nevertheless,CT scans may sometimes offer inadequate spatial resolution,which can limit the differentiation of GB lesions,particularly when smaller yet clinically relevant abnormalities are involved.Conversely,endoscopic ultrasound(EUS)provides higher frequency compared to TUS,superior spatial resolution,and the option for contrast-enhanced harmonic imaging,enabling a more comprehensive examination.Thus,EUS can serve as a supplementary tool when conventional imaging methods are insufficient.This review will describe the standard EUS examination of the GB,focusing on its endosonographic characteristics in various GB path-ologies.展开更多
The aim of this study was to investigate the feasibility and safety of high-intensity focused ultrasound (HIFU) combined with (+) low-dose external beam radiotherapy (LRT) as supplemental therapy for advanced p...The aim of this study was to investigate the feasibility and safety of high-intensity focused ultrasound (HIFU) combined with (+) low-dose external beam radiotherapy (LRT) as supplemental therapy for advanced prostate cancer (PCa) following hormonal therapy (HT). Our definition of HIFU+LRT refers to treating primary tumour lesions with HIFU in place of reduced field boost irradiation to the prostate, while retaining four-field box irradiation to the pelvis in conventional-dose external beam radiotherapy (CRT). We performed a prospective, controlled and non-randomized study on 120 patients with advanced PCa after HT who received HIFU, CRT, HIFU+LRT and HT alone, respectively. CT/MR imaging showed the primary tumours and pelvic lymph node metastases visibly shrank or even disappeared after HIFU +LRT treatment. There were significant differences among four groups with regard to overall survival (OS) and disease-specific survival (DSS) curves (P=0.018 and 0.015). Further comparison between each pair of groups suggested that the long-term DSS of the H IFU + LRT group was higher than those of the other three groups, but there was no significant difference between the HIFU+LRT group and the CRT group. Multivariable Cox's proportional hazard model showed that both HIFU+LRT and CRT were independently associated with DSS (P=0.001 and 0.035) and had protective effects with regard to the risk of death. Compared with CRT, HIFU +LRT significantly decreased incidences of radiation-related late gastrointestinal (GI) and genitourinary (GU) toxicity grade ≥ II. In conclusion, long-term survival of patients with advanced PCa benefited from strengthening local control of primary tumour and reRional lymph node metastases after HT. As an alternative to CRT, HIFU+LRT showed Rood efficacy and better safety.展开更多
This article theoretically studies the influence of inhomogeneous abdominal walls on focused therapeutic ultrasound based on the phase screen model. An inhomogeneous tissue is considered as a combination of a homogene...This article theoretically studies the influence of inhomogeneous abdominal walls on focused therapeutic ultrasound based on the phase screen model. An inhomogeneous tissue is considered as a combination of a homogeneous medium and a phase aberration screen. Variations of acoustic parameters such as peak positive pressure, peak negative pressure, and acoustic intensity are discussed with respect to the phase screen statistics of human abdominal walls. Results indicate that the abdominal wall can result in energy loss of the sound in the focal plane. For a typical human abdominal wall with correlation length of 7.9 mm and variance of 0.36, the peak acoustic intensity radiated from a 1MHz transmitter with a radius of 30 mm can be reduced by about 14% at the focal plane.展开更多
We report a new minimally invasive technique utilizing interventional ultrasound for precise external intracerebral hemorrhage drain(EICHD) placement in pigs.
With the development of technology and accessories,the role of endoscopic ultrasound(EUS) has evolved from diagnostics to therapeutics. In order to characterise the therapeutic role of EUS,we searched Web of Knowledge...With the development of technology and accessories,the role of endoscopic ultrasound(EUS) has evolved from diagnostics to therapeutics. In order to characterise the therapeutic role of EUS,we searched Web of Knowledge database and reviewed articles associated with therapeutic EUS. There are two modalities for the therapeutic purpose: drainage and fine-needle injection. EUS-guided drainage is a promising procedure for the treatment of peripancreatic fluid collection and biliary obstruction; EUS-guided fine-needle injections such as celiac plexus neurolysis,for the purpose of pain relief for pancreatic cancer and chronic pancreatitis,has emerged as a promising procedure. The aim of the study was to perform a comprehensive and conscientious review on the techniques,complications and clinical outcomes of those EUS-based procedures.展开更多
Objective: To investigate the effect of different therapeutic ultrasound (TUS) parameters and culture conditions on the cell viability and transfection efficiency of human cervical cancer cells (HeLa). Methods: ...Objective: To investigate the effect of different therapeutic ultrasound (TUS) parameters and culture conditions on the cell viability and transfection efficiency of human cervical cancer cells (HeLa). Methods: HeLa cells were cultured using two different protocols (in suspension or in monolayer). Subsequently, cells were exposed to different TUS intensity (0.4 W/cm^2, 1.0 W/cm^2, 1.6 W/cm^2, 2.2 W/cm^2), duty cycle (DC)(10%, 20%, 50%), exposure time (1 min or 3 min). Cell viability was analyzed by flow cytometry. Gene transfection of red fluorescent protein (DsRED) was detected. Results: TUS intensity and duty cycle had a great impact on the overall results (P〈0.01). Cell injury were found to increase progressively with intensity (1.6 W/cm^2, 2.2 W/cm^2) and duty cycle (50%) and cell detachment was accompanied by ultrasound exposure in adherent cells Results of factorial design showed that the fashion of cell culture and the TUS parameters had interaction (P〈0.01). The ideal conditions that cell viability above 80% producing maximum efficiency were noted to be at 1.0 W/cm^2 irradiated 3 min with a duty cycle of 20% in cell suspension. Conclusion: TUS parameters and transfection conditions have a great impact on the gene transfection and cell viability. Optimal parameters could enhance cell inembrane permeability, which facilitate to delivering the macromolecules into cells.展开更多
Objective: To evaluate the curative effect of the Traditional Chinese Medicine (TCM) external therapy on knee osteoarthritis patients with different TCM constitutions using musculoskeletal ultrasonography and contrast...Objective: To evaluate the curative effect of the Traditional Chinese Medicine (TCM) external therapy on knee osteoarthritis patients with different TCM constitutions using musculoskeletal ultrasonography and contrast-enhanced ultrasonography, and to explore the application value of contrast-enhanced ultrasonography in knee joint diseases. Methods: A total of 57 patients diagnosed with knee osteoarthritis in Shaanxi University of Traditional Chinese Medicine from December 2019 to May 2021 were collected, and they were divided into qi stagnation and blood stasis type group (23 cases) and cold-dampness obstruction type group (34 cases) according to the traditional Chinese medicine method. All patients were given acupuncture combined with TCM fumigation and washing. All patients underwent musculoskeletal ultrasonography and contrast-enhanced ultrasonography before and after treatment, observed and recorded relevant data, and compared the treatment effects between the two groups. Results: 85.96% (49/57) of knee osteoarthritis (KOA) patients had suprapatellar bursa effusion, 42.1% (24/57) had iliotibial band bursae effusion, some of which had poor sound transmission, and thickened synovium was seen in most effusions, 33.33% (19/57) had osteophyte formation. Compared with before treatment, the depth of suprapatellar sac effusion in the Qi stagnation and blood stasis type group decreased after treatment (P Conclusion: Musculoskeletal contrast-enhanced ultrasonography was used to quantitatively evaluate the efficacy of TCM external therapy on KOA for different TCM constitutions. Dynamic observation of synovial lesions of knee osteoarthritis provides a valuable imaging method for evaluating the efficacy of traditional Chinese medicine.展开更多
The noninvasive ablation of pancreatic cancer with high intensity focused ultrasound(HIFU) energy is received increasingly widespread interest. With rapidly temperature rise to cytotoxic levels within the focal volume...The noninvasive ablation of pancreatic cancer with high intensity focused ultrasound(HIFU) energy is received increasingly widespread interest. With rapidly temperature rise to cytotoxic levels within the focal volume of ultrasound beams, HIFU can selectively ablate a targeted lesion of the pancreas without any damage to surrounding or overlying tissues. Preliminary studies suggest that this approach is technical safe and feasible, and can be used alone or in combination with systemic chemotherapy for the treatment of patients with locally advanced pancreatic cancer. It can effectively alleviate cancer-related abdominal pain, and may confer an additional survival benefit with few significant complications. This review provides a brief overview of HIFU, describes current clinical applications, summarizes characteristics of continuous and pulsed HIFU, and discusses future applications and challenges in the treatment of pancreatic cancer.展开更多
Gastric cancer(GC)represents the fourth leading cause of cancer death worldwide and many factors can influence its development(diet,geographic area,genetic,Helicobacter pylori or Epstein-Barr virus infections).High qu...Gastric cancer(GC)represents the fourth leading cause of cancer death worldwide and many factors can influence its development(diet,geographic area,genetic,Helicobacter pylori or Epstein-Barr virus infections).High quality endoscopy represents the modality of choice for GC diagnosis.The correct morphologic classification during a high-resolution endoscopy is fundamental for oncologic diagnosis,staging and therapeutic decisions.Since its initial introduction in clinical practice the endoscopic ultrasound(EUS)has been considered a valuable tool for tumor(T-)and lymph nodes(N-)staging also in GC,in order to establish the best therapeutic strategy for the patient(e.g.,upfront surgery vs neoadjuvant treatments).EUS tools as elastography,Doppler and contrast administration can improve diagnosis mainly in case of malignant lymph node evaluation.EUS has a marginal role in disease staging but has a fundamental role in case of a pre-endoscopic resection management and in the new era of endoscopic mucosal resection or submucosal dissection as minimally invasive surgery.Diagnosis and locoregional staging of GC with EUS are a method of inarguable value for the assessment of gastric wall involvement and presence of infiltrated paragastric lymph nodes.EUS can also have a role in disease restaging in those patients who have undergone neoadjuvant treatment.EUS can also have a role in the advanced phases of the disease,in facilitating palliative,minimallyinvasive treatments,such as gastroenterostomy or biliary drainages.This review intends to discuss the modern role of EUS in GC topic.展开更多
Endoscopic ultrasound(EUS)is one of the significant breakthroughs in the field of advanced endoscopy.In the last two decades,EUS has evolved from a diagnostic tool to a real-time therapeutic modality.The luminal gastr...Endoscopic ultrasound(EUS)is one of the significant breakthroughs in the field of advanced endoscopy.In the last two decades,EUS has evolved from a diagnostic tool to a real-time therapeutic modality.The luminal gastrointestinal(GI)tract provides a unique opportunity to access multiple vascular structures,especially in the mediastinum and abdomen,thus permitting a variety of EUS-guided vascular interventions.The addition of the doppler and contrast-enhanced capability to EUS has further helped provide real-time visualization of blood flow in vessels through the GI tract.EUS-guided vascular interventions rely on standard endoscopic accessories and interventional tools such as fine-needle aspiration needles and fine-needle biopsy.EUS allows the visualization of various structures in real-time by differentiating tissue densities and vascularity,thus,avoiding radiation exposure.EUS-guided techniques also allow real-time microscopic examination after target biopsy.Furthermore,many necessary interventions can be done during the same procedure after diagnosis.This article provides an overview of EUS-guided vascular interventions such as variceal,non-variceal bleeding interventions,EUSguided portal vein(PV)access with the formation of an intrahepatic portosystemic shunt,and techniques related to diagnosis of GI malignancies.Furthermore,we discuss current insights and future outlook of therapeutic modalities like PV embolization,PV sampling,angiography,drug administration,and portal pressure measurement.展开更多
AIM To investigate whether endoscopic ultrasound(EUS)-guided insertion of fully covered self-expandable metal stents in walled-off pancreatic necrosis(WOPN) is feasible without fluoroscopy.METHODS Patients with sympto...AIM To investigate whether endoscopic ultrasound(EUS)-guided insertion of fully covered self-expandable metal stents in walled-off pancreatic necrosis(WOPN) is feasible without fluoroscopy.METHODS Patients with symptomatic pancreatic WOPN undergoing EUS-guided transmural drainage using self-expandable and fully covered self expanding metal stents(FCSEMS) were included. The EUS visibility of each step involved in the transmural stent insertion was assessed by theoperators as "visible" or "not visible":(1) Access to the cyst by needle or cystotome;(2) insertion of a guide wire;(3) introducing of the diathermy and delivery system;(4) opening of the distal flange; and(5) slow withdrawal of the delivery system until contact of distal flange to cavity wall. Technical success was defined as correct positioning of the FCSEMS without the need of fluoroscopy.RESULTS In total, 27 consecutive patients with symptomatic WOPN referred for EUS-guided drainage were included. In 2 patients large traversing arteries within the cavity were detected by color Doppler, therefore the insertion of FCSEMS was not attempted. In all other patients(92.6%) EUS-guided transgastric stent insertion was technically successful without fluoroscopy. All steps of the procedure could be clearly visualized by EUS. Nine patients required endoscopic necrosectomy through the FCSEMS. Adverse events were two readmissions with fever and one self-limiting bleeding; there was no procedure-related mortality. CONCLUSION The good endosonographic visibility of the FCSEMS delivery system throughout the procedure allows safe EUS-guided insertion without fluoroscopy making it available as bedside intervention for critically ill patients.展开更多
The formation of free radicals OH and H in a naturally air-saturated aqueous solution exposed to therapeutic CW ultrasound at a frequency of 820 kHz has been confirmed by using spin trapping 5, 5-dimethyl-1-pyrroline-...The formation of free radicals OH and H in a naturally air-saturated aqueous solution exposed to therapeutic CW ultrasound at a frequency of 820 kHz has been confirmed by using spin trapping 5, 5-dimethyl-1-pyrroline-1-oxide ( DMPO ) and electron spin resonance ( ESR) technique . It is suggested that these radicals are formed due to the high temperature and pressure produced by the ultrasonic transient cavitation. The transient cavitation threshold is found at 0. 537-0.632W/cm2 under a sonication time of 3 minutes .With increasing sound intensity the yield of free radicals OH raises rapidly at the intensity ranging from 1-2W/ cm2, and no longer increase is observed at above 3W/cm2. The sound intensity (Ⅰ) dependence of the yield of OH(D) can be approximately described by a regression equation: D = 8.1(I1/2 -Ic1/2 )1/2 where Ic=0. 667W/ cm2 . Under a fixing sound intensity the yield of OH increases monotonously with the sonication time.展开更多
Background Intravascular microbubble-enhanced acoustic cavitation is capable of disrupting the vascular walls of capillaries and small vessels. This study was designed to investigate the impact of microbubble-enhanced...Background Intravascular microbubble-enhanced acoustic cavitation is capable of disrupting the vascular walls of capillaries and small vessels. This study was designed to investigate the impact of microbubble-enhanced, pulsed and focused ultrasound (MEUS) on the blood perfusion of subcutaneous VX2 tumors in rabbits. Methods Subcutaneous VX2 cancers in twenty New Zealand rabbits were treated by combining high-pressure amplitude, pulsed and focused therapeutic ultrasound (TUS) and intravenous microbubble injections. The TUS transducer was operated with a peak negative pressure of 4.6 MPa and a duty cycle of 0.41%. Controls were subcutaneous VX2 cancers treated with TUS or microbubbles only. Contrast-enhanced ultrasound (CEUS) and intravenous Evans Blue (EB) perfusion were performed to assess the tumor circulation. The tumor microvascular disruption was assessed by histological examination. Results CEUS showed that the tumor circulation almost vanished after MEUS treatment. The average peak grayscale value (GSV) of tumor CEUS dropped significantly from 84.1±22.4 to 15.8±10.8 in the MEUS-treated tumors but no significant GSV changes were found in tumors in the two control groups. The mean tumor EB content of the MEUS-treated tumors was significantly lower than that of the controls. Histological examination found scattered tumor microvascular disruption with intercellular edema after MEUS treatment. Conclusion The tumor circulation of VX2 cancers can be arrested or significantly reduced by MEUS due to microvascular disruption. Chin M~.cl ,I 2014:127 (14): 2605-2611展开更多
Application of herbal medicine to acupoints is to regulate the meridians, yin-yang, and qi and blood for preventing and treating diseases through the pharmacological action of herbal medicines and with their stimulati...Application of herbal medicine to acupoints is to regulate the meridians, yin-yang, and qi and blood for preventing and treating diseases through the pharmacological action of herbal medicines and with their stimulation to the acupoints. This article explains how to apply herbal medicines and gave the examples for the treatment of hypertension, asthma, chronic bronchitis and allergic rhinitis. Application of herbal medicines to acupoints is one of the important components of TCM, which shows satisfactory effects in treatment of some chronic diseases.展开更多
文摘The gallbladder(GB)is a susceptible organ,prone to various pathologies that can be identified using different imaging techniques.Transabdominal ultrasound(TUS)is typically the initial diagnostic method due to its numerous well-established advantages.However,in cases of uncertainty or when a definitive diagnosis cannot be established,computed tomography(CT)or magnetic resonance imaging may be employed to provide more detailed information.Nevertheless,CT scans may sometimes offer inadequate spatial resolution,which can limit the differentiation of GB lesions,particularly when smaller yet clinically relevant abnormalities are involved.Conversely,endoscopic ultrasound(EUS)provides higher frequency compared to TUS,superior spatial resolution,and the option for contrast-enhanced harmonic imaging,enabling a more comprehensive examination.Thus,EUS can serve as a supplementary tool when conventional imaging methods are insufficient.This review will describe the standard EUS examination of the GB,focusing on its endosonographic characteristics in various GB path-ologies.
文摘The aim of this study was to investigate the feasibility and safety of high-intensity focused ultrasound (HIFU) combined with (+) low-dose external beam radiotherapy (LRT) as supplemental therapy for advanced prostate cancer (PCa) following hormonal therapy (HT). Our definition of HIFU+LRT refers to treating primary tumour lesions with HIFU in place of reduced field boost irradiation to the prostate, while retaining four-field box irradiation to the pelvis in conventional-dose external beam radiotherapy (CRT). We performed a prospective, controlled and non-randomized study on 120 patients with advanced PCa after HT who received HIFU, CRT, HIFU+LRT and HT alone, respectively. CT/MR imaging showed the primary tumours and pelvic lymph node metastases visibly shrank or even disappeared after HIFU +LRT treatment. There were significant differences among four groups with regard to overall survival (OS) and disease-specific survival (DSS) curves (P=0.018 and 0.015). Further comparison between each pair of groups suggested that the long-term DSS of the H IFU + LRT group was higher than those of the other three groups, but there was no significant difference between the HIFU+LRT group and the CRT group. Multivariable Cox's proportional hazard model showed that both HIFU+LRT and CRT were independently associated with DSS (P=0.001 and 0.035) and had protective effects with regard to the risk of death. Compared with CRT, HIFU +LRT significantly decreased incidences of radiation-related late gastrointestinal (GI) and genitourinary (GU) toxicity grade ≥ II. In conclusion, long-term survival of patients with advanced PCa benefited from strengthening local control of primary tumour and reRional lymph node metastases after HT. As an alternative to CRT, HIFU+LRT showed Rood efficacy and better safety.
基金Project supported by the Program for New Century Excellent Talents in University of China (Grant No 06-0450)the National Natural Science Foundation of China (Grant No 10774071)the Natural Science Foundation of Jiangsu Province, China (Grant No BK2007518)
文摘This article theoretically studies the influence of inhomogeneous abdominal walls on focused therapeutic ultrasound based on the phase screen model. An inhomogeneous tissue is considered as a combination of a homogeneous medium and a phase aberration screen. Variations of acoustic parameters such as peak positive pressure, peak negative pressure, and acoustic intensity are discussed with respect to the phase screen statistics of human abdominal walls. Results indicate that the abdominal wall can result in energy loss of the sound in the focal plane. For a typical human abdominal wall with correlation length of 7.9 mm and variance of 0.36, the peak acoustic intensity radiated from a 1MHz transmitter with a radius of 30 mm can be reduced by about 14% at the focal plane.
基金supported by grants from the Beijing Science and Technology New Star Project (XX2018019/Z181100006218028)the National Natural Science Fund (81701961)+3 种基金the PLA Logistic Major Science and Technology Project (16QNP135)the PLA General Hospital Science and Technology Project (2018XXFC-20, 16KMM56, 2017FC-WJFWZX-30)the Winter Olympics of Science and Technology (2019YFF0302300)the Construction Project of Key Disciplines in the 13th Five-Year Plan of the PLA (Traumatic Surgery in the Battlefield, 2019–126, 2019–513)。
文摘We report a new minimally invasive technique utilizing interventional ultrasound for precise external intracerebral hemorrhage drain(EICHD) placement in pigs.
文摘With the development of technology and accessories,the role of endoscopic ultrasound(EUS) has evolved from diagnostics to therapeutics. In order to characterise the therapeutic role of EUS,we searched Web of Knowledge database and reviewed articles associated with therapeutic EUS. There are two modalities for the therapeutic purpose: drainage and fine-needle injection. EUS-guided drainage is a promising procedure for the treatment of peripancreatic fluid collection and biliary obstruction; EUS-guided fine-needle injections such as celiac plexus neurolysis,for the purpose of pain relief for pancreatic cancer and chronic pancreatitis,has emerged as a promising procedure. The aim of the study was to perform a comprehensive and conscientious review on the techniques,complications and clinical outcomes of those EUS-based procedures.
基金supported by a grant from the National Natural Science Foundation of China(No.30670548).
文摘Objective: To investigate the effect of different therapeutic ultrasound (TUS) parameters and culture conditions on the cell viability and transfection efficiency of human cervical cancer cells (HeLa). Methods: HeLa cells were cultured using two different protocols (in suspension or in monolayer). Subsequently, cells were exposed to different TUS intensity (0.4 W/cm^2, 1.0 W/cm^2, 1.6 W/cm^2, 2.2 W/cm^2), duty cycle (DC)(10%, 20%, 50%), exposure time (1 min or 3 min). Cell viability was analyzed by flow cytometry. Gene transfection of red fluorescent protein (DsRED) was detected. Results: TUS intensity and duty cycle had a great impact on the overall results (P〈0.01). Cell injury were found to increase progressively with intensity (1.6 W/cm^2, 2.2 W/cm^2) and duty cycle (50%) and cell detachment was accompanied by ultrasound exposure in adherent cells Results of factorial design showed that the fashion of cell culture and the TUS parameters had interaction (P〈0.01). The ideal conditions that cell viability above 80% producing maximum efficiency were noted to be at 1.0 W/cm^2 irradiated 3 min with a duty cycle of 20% in cell suspension. Conclusion: TUS parameters and transfection conditions have a great impact on the gene transfection and cell viability. Optimal parameters could enhance cell inembrane permeability, which facilitate to delivering the macromolecules into cells.
文摘Objective: To evaluate the curative effect of the Traditional Chinese Medicine (TCM) external therapy on knee osteoarthritis patients with different TCM constitutions using musculoskeletal ultrasonography and contrast-enhanced ultrasonography, and to explore the application value of contrast-enhanced ultrasonography in knee joint diseases. Methods: A total of 57 patients diagnosed with knee osteoarthritis in Shaanxi University of Traditional Chinese Medicine from December 2019 to May 2021 were collected, and they were divided into qi stagnation and blood stasis type group (23 cases) and cold-dampness obstruction type group (34 cases) according to the traditional Chinese medicine method. All patients were given acupuncture combined with TCM fumigation and washing. All patients underwent musculoskeletal ultrasonography and contrast-enhanced ultrasonography before and after treatment, observed and recorded relevant data, and compared the treatment effects between the two groups. Results: 85.96% (49/57) of knee osteoarthritis (KOA) patients had suprapatellar bursa effusion, 42.1% (24/57) had iliotibial band bursae effusion, some of which had poor sound transmission, and thickened synovium was seen in most effusions, 33.33% (19/57) had osteophyte formation. Compared with before treatment, the depth of suprapatellar sac effusion in the Qi stagnation and blood stasis type group decreased after treatment (P Conclusion: Musculoskeletal contrast-enhanced ultrasonography was used to quantitatively evaluate the efficacy of TCM external therapy on KOA for different TCM constitutions. Dynamic observation of synovial lesions of knee osteoarthritis provides a valuable imaging method for evaluating the efficacy of traditional Chinese medicine.
文摘The noninvasive ablation of pancreatic cancer with high intensity focused ultrasound(HIFU) energy is received increasingly widespread interest. With rapidly temperature rise to cytotoxic levels within the focal volume of ultrasound beams, HIFU can selectively ablate a targeted lesion of the pancreas without any damage to surrounding or overlying tissues. Preliminary studies suggest that this approach is technical safe and feasible, and can be used alone or in combination with systemic chemotherapy for the treatment of patients with locally advanced pancreatic cancer. It can effectively alleviate cancer-related abdominal pain, and may confer an additional survival benefit with few significant complications. This review provides a brief overview of HIFU, describes current clinical applications, summarizes characteristics of continuous and pulsed HIFU, and discusses future applications and challenges in the treatment of pancreatic cancer.
文摘Gastric cancer(GC)represents the fourth leading cause of cancer death worldwide and many factors can influence its development(diet,geographic area,genetic,Helicobacter pylori or Epstein-Barr virus infections).High quality endoscopy represents the modality of choice for GC diagnosis.The correct morphologic classification during a high-resolution endoscopy is fundamental for oncologic diagnosis,staging and therapeutic decisions.Since its initial introduction in clinical practice the endoscopic ultrasound(EUS)has been considered a valuable tool for tumor(T-)and lymph nodes(N-)staging also in GC,in order to establish the best therapeutic strategy for the patient(e.g.,upfront surgery vs neoadjuvant treatments).EUS tools as elastography,Doppler and contrast administration can improve diagnosis mainly in case of malignant lymph node evaluation.EUS has a marginal role in disease staging but has a fundamental role in case of a pre-endoscopic resection management and in the new era of endoscopic mucosal resection or submucosal dissection as minimally invasive surgery.Diagnosis and locoregional staging of GC with EUS are a method of inarguable value for the assessment of gastric wall involvement and presence of infiltrated paragastric lymph nodes.EUS can also have a role in disease restaging in those patients who have undergone neoadjuvant treatment.EUS can also have a role in the advanced phases of the disease,in facilitating palliative,minimallyinvasive treatments,such as gastroenterostomy or biliary drainages.This review intends to discuss the modern role of EUS in GC topic.
文摘Endoscopic ultrasound(EUS)is one of the significant breakthroughs in the field of advanced endoscopy.In the last two decades,EUS has evolved from a diagnostic tool to a real-time therapeutic modality.The luminal gastrointestinal(GI)tract provides a unique opportunity to access multiple vascular structures,especially in the mediastinum and abdomen,thus permitting a variety of EUS-guided vascular interventions.The addition of the doppler and contrast-enhanced capability to EUS has further helped provide real-time visualization of blood flow in vessels through the GI tract.EUS-guided vascular interventions rely on standard endoscopic accessories and interventional tools such as fine-needle aspiration needles and fine-needle biopsy.EUS allows the visualization of various structures in real-time by differentiating tissue densities and vascularity,thus,avoiding radiation exposure.EUS-guided techniques also allow real-time microscopic examination after target biopsy.Furthermore,many necessary interventions can be done during the same procedure after diagnosis.This article provides an overview of EUS-guided vascular interventions such as variceal,non-variceal bleeding interventions,EUSguided portal vein(PV)access with the formation of an intrahepatic portosystemic shunt,and techniques related to diagnosis of GI malignancies.Furthermore,we discuss current insights and future outlook of therapeutic modalities like PV embolization,PV sampling,angiography,drug administration,and portal pressure measurement.
文摘AIM To investigate whether endoscopic ultrasound(EUS)-guided insertion of fully covered self-expandable metal stents in walled-off pancreatic necrosis(WOPN) is feasible without fluoroscopy.METHODS Patients with symptomatic pancreatic WOPN undergoing EUS-guided transmural drainage using self-expandable and fully covered self expanding metal stents(FCSEMS) were included. The EUS visibility of each step involved in the transmural stent insertion was assessed by theoperators as "visible" or "not visible":(1) Access to the cyst by needle or cystotome;(2) insertion of a guide wire;(3) introducing of the diathermy and delivery system;(4) opening of the distal flange; and(5) slow withdrawal of the delivery system until contact of distal flange to cavity wall. Technical success was defined as correct positioning of the FCSEMS without the need of fluoroscopy.RESULTS In total, 27 consecutive patients with symptomatic WOPN referred for EUS-guided drainage were included. In 2 patients large traversing arteries within the cavity were detected by color Doppler, therefore the insertion of FCSEMS was not attempted. In all other patients(92.6%) EUS-guided transgastric stent insertion was technically successful without fluoroscopy. All steps of the procedure could be clearly visualized by EUS. Nine patients required endoscopic necrosectomy through the FCSEMS. Adverse events were two readmissions with fever and one self-limiting bleeding; there was no procedure-related mortality. CONCLUSION The good endosonographic visibility of the FCSEMS delivery system throughout the procedure allows safe EUS-guided insertion without fluoroscopy making it available as bedside intervention for critically ill patients.
基金The project is supported by Natural Science Foundation of China
文摘The formation of free radicals OH and H in a naturally air-saturated aqueous solution exposed to therapeutic CW ultrasound at a frequency of 820 kHz has been confirmed by using spin trapping 5, 5-dimethyl-1-pyrroline-1-oxide ( DMPO ) and electron spin resonance ( ESR) technique . It is suggested that these radicals are formed due to the high temperature and pressure produced by the ultrasonic transient cavitation. The transient cavitation threshold is found at 0. 537-0.632W/cm2 under a sonication time of 3 minutes .With increasing sound intensity the yield of free radicals OH raises rapidly at the intensity ranging from 1-2W/ cm2, and no longer increase is observed at above 3W/cm2. The sound intensity (Ⅰ) dependence of the yield of OH(D) can be approximately described by a regression equation: D = 8.1(I1/2 -Ic1/2 )1/2 where Ic=0. 667W/ cm2 . Under a fixing sound intensity the yield of OH increases monotonously with the sonication time.
文摘Background Intravascular microbubble-enhanced acoustic cavitation is capable of disrupting the vascular walls of capillaries and small vessels. This study was designed to investigate the impact of microbubble-enhanced, pulsed and focused ultrasound (MEUS) on the blood perfusion of subcutaneous VX2 tumors in rabbits. Methods Subcutaneous VX2 cancers in twenty New Zealand rabbits were treated by combining high-pressure amplitude, pulsed and focused therapeutic ultrasound (TUS) and intravenous microbubble injections. The TUS transducer was operated with a peak negative pressure of 4.6 MPa and a duty cycle of 0.41%. Controls were subcutaneous VX2 cancers treated with TUS or microbubbles only. Contrast-enhanced ultrasound (CEUS) and intravenous Evans Blue (EB) perfusion were performed to assess the tumor circulation. The tumor microvascular disruption was assessed by histological examination. Results CEUS showed that the tumor circulation almost vanished after MEUS treatment. The average peak grayscale value (GSV) of tumor CEUS dropped significantly from 84.1±22.4 to 15.8±10.8 in the MEUS-treated tumors but no significant GSV changes were found in tumors in the two control groups. The mean tumor EB content of the MEUS-treated tumors was significantly lower than that of the controls. Histological examination found scattered tumor microvascular disruption with intercellular edema after MEUS treatment. Conclusion The tumor circulation of VX2 cancers can be arrested or significantly reduced by MEUS due to microvascular disruption. Chin M~.cl ,I 2014:127 (14): 2605-2611
文摘Application of herbal medicine to acupoints is to regulate the meridians, yin-yang, and qi and blood for preventing and treating diseases through the pharmacological action of herbal medicines and with their stimulation to the acupoints. This article explains how to apply herbal medicines and gave the examples for the treatment of hypertension, asthma, chronic bronchitis and allergic rhinitis. Application of herbal medicines to acupoints is one of the important components of TCM, which shows satisfactory effects in treatment of some chronic diseases.