In this paper, according to the requirement of the focused sound field measurement, a focused sound field measurement system was established based on the LabVIEW virtual instrument platform. The system can automatically search the focus position of the sound field, and adjust the scanning path according to the size of the focal region. Three-dimensional sound field scanning time reduced from 888 hours in uniform step to 9.25 hours in variable step. The efficiency of the focused sound field measurement was improved. There is a certain deviation between measurement results and theoretical calculation results. Focal plane--6 dB width difference rate was 3.691%, the beam axis--6 dB length differences rate was 12.937%.
Computer Simulation ; Numerical Analysis, Computer-Assisted ; Software ; Sound

Objective:To investigate the impacts of two anesthesia approaches on infections of immunological parameters during splenectomy in hepatocellular carcinoma patients .Methods: Sixty hepatocellular carcinoma patients were divided into two groups randomly,each groups was thirty (liver function Child-Pugh grade was A-B).Total intravenous anesthesia with pmpofol group (group A,n=30 ) and combined intravenous inhalational anesthesia with sevoflurane group (group B,n=30 ).Before induction of anesthesia , at the end of operation ,and after operation 24 hours.blood samples were collected to determined with the level of CD 3+,CD4+,CD8+, CD4+/CD8+and TNF-α, IL-2, IL-6 of hepatocellular carcinoma patients .Results: The perioperative physiological index MAP , HR, SpO2,RR each point had no obvious difference between two groups (P>0.05).The levels of CD3+,CD4+,CD8+,CD4+/CD8+had no significant difference between two groups before anesthesia (P>0.05).There was no significant changes in CD3+,CD8+with two groups in all moments.Compared with the T0,A,B two groups of CD4+,CD4+/CD8+were lower (P<0.05)in T1 point,but T2 point and T0 point had no significant difference in group B .The levels of CD4+,CD4+/CD8+in group B were higher than in group A ( P<0.05 ) . Compared with T0 moment,group A and group B patients postoperative IL-6 in T1,T2 level increased significantly (P<0.05),and there was no statistically significant difference between group A and group B in all moment .( P>0.05 ) .Compared with the T0 moment,there was no significant change in group A of TNF-αlevel (P>0.05),while group B increased significantly in postoperative day ( P<0.05 ) .The level of IL-2 in each moment interval between the two groups had no significant difference ( P>0.05 ) . Conclusion: Both total intravenous anesthesia with pmpofol and combined intravenous inhalational anesthesia with sevoflurane inhibit the immune function of the patients with hepatocellular carcinoma cell immune reaction .The inhibitory effect of sevoflurane inhalation anesthesia on cell immune function is less affected .

Small-scale intellectualized medical instrument has attracted great attention in the field of biomedical engineering, and LabVIEW (Laboratory Virtual Instrument Engineering Workbench) provides a convenient environment for this application due to its inherent advantages. The principle and system structure of the hyperthermia instrument are presented. Type T thermocouples are employed as thermotransducers, whose amplifier consists of two stages, providing built-in ice point compensation and thus improving work stability over temperature. Control signals produced by specially designed circuit drive the programmable counter/timer 8254 chip to generate PWM (Pulse width modulation) wave, which is used as ultrasound radiation energy control signal. Subroutine design topics such as inner-tissue real time feedback temperature control algorithm, water temperature control in the ultrasound applicator are also described. In the cancer tissue temperature control subroutine, the authors exert new improvments to PID (Proportional Integral Differential) algorithm according to the specific demands of the system and achieve strict temperature control to the target tissue region. The system design and PID algorithm improvement have experimentally proved to be reliable and excellent, meeting the requirements of the hyperthermia system.
Algorithms ; Computer Simulation ; Hyperthermia, Induced ; instrumentation ; Neoplasms ; therapy ; Software Design ; Ultrasonic Therapy ; instrumentation ; methods

Objective:To analyze the effect of rehabilitation nursing based on dynamic and static complementary balance theory in functional exercise of patients after total knee replacement.Methods:A simple random sampling was used to select 84 patients who underwent total knee arthroplasty in Lishui Municipal Central Hospital from June 2020 to June 2021. The patients were divided into observation group and control group with 42 cases each by random number table. The patients in the control group were given routine rehabilitation nursing before discharge, and the patients in the observation group were given rehabilitation nursing based on the dynamic and static complementary balance theory before discharge. At the time of discharge and one and three months after discharge, the functional exercise compliance (score of the Out-of-hospital Functional Rehabilitation Exercise Compliance Questionnaire), knee joint function score and balance ability score of the two groups of patients were compared, and the hospital stay and complication incidence of the two groups of patients within three months after discharge were recorded and compared.Results:Within three months after discharge, the scores of Out-of-hospital Functional Rehabilitation Exercise Compliance Questionnaire in the two groups decreased, knee joint function scores and balance ability scores of patients in the two groups increased, and the scores in the observation group were higher than those in the control group one and three months after discharge, with statistically significant differences ( P<0.05). The hospital stay of patients in the observation group was shorter than that in the control group, and the total incidence of complications within three months after discharge was lower than that in the control group, with statistically significant differences ( P<0.05) . Conclusions:Rehabilitation nursing based on the dynamic and static complementary balance theory can effectively promote the recovery of knee joint function of patients after total knee replacement, improve the compliance of patients with functional exercise, and reduce the occurrence of complications.

The placement of the flexible ureteroscopic sheath during lithotripsy may injure the ureter. We have developed a double-tube flexible ureteral access sheath. Thirteen patients with renal calculi were treated with double-tube and flexible sheath in one stage. CT examination of 13 cases showed that the ureter was normal. The double-tube flexible ureteral access sheath makes the operation of sheathing easy, safe and effective.

Objective To explore the application of breast milk ( colostrum, transitional milk, and mature milk) oral care on the prevention of ventilator-associated pneumonia (VAP) in neonatus. Methods Oral care with breast milk was implemented as part of the VAP-prevention bundle nursing in the neonatal intensive care unit ( NICU) from the January of 2012 in Taihe Hospital affiliated of Hubei University of Medicine. A total of 34 cases used normal saline as oral care ( before used breast milk as oral care) as control group between January 2010 and December 2011, and 38 cases utilized breast milk for oral care (after used breast milk as oral care) as observation group between January 2012 and December 2013. Both groups were compared by the results of oral pharyngeal and tracheal secretion culture after tracheal intubation, and the incidence of VAP. Results Contrasted 32. 35%, (103. 62 ± 23. 07) h,(17. 94 ± 2. 53) d in the control group, the incidence of VAP, duration of ventilatory support, and length of hospital stays in the observation group were 10. 53%,(92. 76 ± 14. 15) h and (14. 95 ± 2. 25) d (t/χ2 =5. 183,2. 373,5. 307;P <0. 05). After using breast milk for oral care, the pathogenic microorganisms detection rate of oropharyngeal and endotracheal was 10. 53% and 7. 89%, lower than 32. 35%and 26. 47% in the control group, the differences were statistically significant(χ2 =5. 18,4. 46;P <0. 05). Conclusions Using breast milk as oral care can effectively prevent neonatal VAP, and reduce duration of ventilatory support as well as the length hospital stays.

OBJECTIVETo identify valid measures for preventing outbreaks of severe acute respiratory syndrome (SARS) among protected healthcare workers in isolation units.

METHODSArchitectural factors, admitted SARS cases and infection of healthcare workers in different isolation wards between January 30 and March 30, 2003 were analyzed.

RESULTSFour types of isolation wards were analyzed, including the ward where the thirty-first bed was located on the twelfth floor, the laminar flow ward in the Intensive Care Unit where the tenth bed was located on the fifteenth floor, the ward where the twenty-seventh bed was located on the thirteenth floor of the Lingnan Building, and thirty wards on the fourteenth to eighteenth floors of the Zhongshan Building. The ratios (m(2)/m(3)) of the area of the ventilation windows to the volume of the rooms were 0, 0, 1:95 and 1:40, respectively. Numbers of SARS cases in the wards mentioned above were 1, 1, 1 and 96, respectively. Total times of hospitalization were 43, 168, 110 and 1272 hours, respectively. The infection rates of the healthcare workers in the areas mentioned above were 73.2%, 32.1%, 27.5% and 1.7%, respectively. The difference in the infection rates was of statistical significance.

CONCLUSIONSIsolating SARS cases in wards with good ventilation could reduce the viral load of the ward and might be the key to preventing outbreaks of SARS among healthcare workers along with strict personal protection measures in isolation units.

Adult ; Disease Outbreaks ; prevention & control ; Facility Design and Construction ; Female ; Hospital Units ; Humans ; Infectious Disease Transmission, Patient-to-Professional ; prevention & control ; Male ; Middle Aged ; Patient Isolation ; Severe Acute Respiratory Syndrome ; prevention & control ; Ventilation

OBJECTIVETo explore digestive system manifestations in patients with severe acute respiratory syndrome (SARS).

METHODThe clinical data of 96 cases with SARS admitted into our hospital from February 6, 2003 to March 28, 2003 were retrospectively analyzed.

RESULTSAmong the 96 cases, 26 cases (27%) had diarrhea, 17 (18%) had nausea, 6 (6%) had vomiting, 16 (17%) had bellyache, and 8 (8%) had ALT elevation.

CONCLUSIONSPatients with SARS may have digestive system manifestations; diarrhea is the most common symptom.

Adolescent ; Adult ; Diarrhea ; etiology ; Digestive System Diseases ; etiology ; Female ; Humans ; Male ; Middle Aged ; Retrospective Studies ; Severe Acute Respiratory Syndrome ; complications

OBJECTIVETo describe a hospital outbreak of severe acute respiratory syndrome (SARS) and summarize its clinical features and therapeutic approaches.

METHODSThe outbreak started with a SARS patient from the community, and a total of 96 people (76 women and 20 men, mean age (29.5 +/- 10.3) years, 93.8% of whom were health care workers) who had exposure to this source patient became infected in a short time. Clinical data in this cohort were collected prospectively as they were identified.

RESULTS(1) The incubation period ranged from 1 to 20 (mean: 5.9 +/- 3.5) days. The duration of hospitalization was (17.2 +/- 8.0) days. (2) The initial temperature was (38.3 +/- 0.6) degrees C, while the highest was (39.2 +/- 0.6) degrees C (P < 0.001), with fever duration of (9.0 +/- 4.2) days. (3) Other most common symptoms included fatigue (93.8%), cough (85.4%), mild sputum production (66.7%), chills (55.2%), headache (39.6%), general malaise (35.4%) and myalgia (21.9%). (4) The radiographic changes were predominantly bilateral in the middle or lower lung zones. The number of affected lung fields was 1.2 +/- 0.8 on presentation, which increased to 2.9 +/- 1.4 after admission (P < 0.001). The interval from the beginning of fever to the onset of abnormal chest radiographs was (3.5 +/- 2.3) days, which increased in size, extent, and severity to the maximum (6.7 +/- 3.5) days later. The time before the lung opacities were basically absorbed was (14.9 +/- 7.8) days. (5) Leukopenia was observed in 67.7% of this cohort. The time between the onset of fever and leukopenia was (4.4 +/- 2.3) days, with the lowest white blood cell count of (2.80 +/- 0.72) x 10(9)/L. (6) The lowest arterial oxygen saturation was (94.8 +/- 3.1)% with supplementary oxygen. (7) Antibiotical therapies included tetracyclines (91.0%), aminoglycosides (83.3%), quinolones (79.2%); 18.8% of the patients received a combination of tetracyclines and aminoglycosides, while 11.5% received a combination of tetracyclines and quinolones, and 63.5% received a combination of tetracyclines, aminoglycosides and quinolones. Vancomycin was used in 13.5% of the patients. (8) 68.8% of the patients were treated with methylprednisolones for a mean interval of (4.9 +/- 2.4) days. The initial dose was (67.3 +/- 28.2) mg/d and the maximal dose was (82.4 +/- 30.5) mg/d. (9) Human gamma-globulin, interferon-alpha, antiviral drugs (oral ribavirin or oseltamivir) were used respectively in 68.6%, 46.9% and 92.7% of the patients. (10) Ninety-five patients (99.0%) had a complete clinical recovery, and only 1 patient (1.0%) died.

CONCLUSIONSSARS appears to be quickly infectious and potentially lethal among health care workers, characterized by acute onset and rapid progression, and mostly bilateral lung involvement on chest radiographs. Proper administration of glucocorticosteroids seems to be of some benefits. Antibiotics, human gamma-globulin, interferon-alpha, and antiviral drugs, although empirically, might be useful to shorten the clinical course.

Adult ; China ; epidemiology ; Cross Infection ; diagnosis ; epidemiology ; therapy ; Disease Outbreaks ; Female ; Humans ; Male ; Severe Acute Respiratory Syndrome ; diagnosis ; epidemiology ; therapy

Objective:To determine any effect of repeated thermal stimulation on the viability and functioning of inflamed human umbilical vein endothelial cells (HUVECs).Methods:Well-cultured HUVECs were divided into a normal group, a model group, a thermal stimulation 5 times group (group A), a thermal stimulation 9 times group (group B) and a thermal stimulation 13 times group (group C) and cultured under the same conditions. The normal group was not given any intervention. The model group was stimulated with 1μg/mL lipopolysaccharide for 1 hour. Groups A, B and C were first subjected to 5, 9 and 13 rounds of repeated thermal stimulation, each round lasting 4 minutes at 43℃ and 1 minute at room temperature. They were then incubated for one hour at 37℃ under a 5% CO 2 atmosphere with 1μg/mL lipopolysaccharide. Cell viability and the expression of NF-κB were evaluated using methyl thiazolyl tetrazolium and immunofluorescence assays. The levels of intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) were determined by enzyme-linked immunosorbent assay. Results:After the intervention, the average cell viability of the model group and of groups A and C was significantly lower than that of the normal group, while that of group B was significantly higher. After the intervention, the average NF-κB expression in the normal group was significantly different from that in the others, with group B′s level significantly different from that of the model group. After the treatment, the average expression of ICAM-1 and VCAM-1 in the model group had increased significantly, while that in groups A, B and C had decreased significantly compared with the normal group. The levels of groups A, B and C were then significantly different from that of the model group. The average ICAM-1 level of group B was significantly different from those of groups A and C.Conclusions:Repeated thermal stimulation can protect inflamed HUVECs and reduce the expression of HUVEC adhesion molecules.