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Objective To investigate the risk factors for death within 30 days of stroke associated pneumonia(SAP) in elderly patients of the intensive care unit (ICU).Methods Clinical data of 116 patients with SAP who were admitted to ICU were reviewed.The predicting factors of death within 30 days were analyzed through variable analysis method.Results The hospitalization periods of the SAP group and control group were (27±8) d and (12±5) d,the difference was statistically significant(t =1 1.30,P =0.002).The most common pathogenic bacteria in SAP were Klebsiella pneumoniae,Bauman Acinetobacter,Escherichia coli,and gram negative bacteria.There was significant difference between the two groups in term of mortality rate(37.9％(44/ 116) of SAP group,22.0％ (22/100) of control group,x2 =6.423,P =0.011).Logistic regression analysis showed that basic diseases(OR =2.778,95％ CI:1.205-6.401),high CRUB-65 score (OR =1.978,95％ CI:0.871-11.098),lower Glasgow coma score(GCS) (OR=3.601,95％CI:0.244-9.477),bucking(OR=3.020,95％CI:1.305-10.603),mechanical ventilation(OR=2.654,95％CI:1.176-5.990),shock(OR=2.636,95％ CI:1.164-5.969) and high plasma CRP level(OR=2.333,95％CI:1.046-5.206) were risk factors for SAP (all P＜0.05).In Cox regression analysis,a GCS score of ＜ 9 was an independent risk factor for 30 d mortality of patientswithSAP(HR=7.23,95％Cl:2.24-20.11,P=0.001).Conclusion SAP is one of the serious complications of the elderly hospitalized for the acute stroke in the ICU,which may affect the prognosis of the patients.
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We developed an ultrasound tumor hyperthermia instrument by optimizing the embedded platform and system units construction to realize miniaturization and portability. The instrument can accurately and safely control the target temperature by using PID feedback algorithm.
Subject(s)
Humans , Algorithms , Equipment Design , Hyperthermia, Induced , Neoplasms , Therapeutics , Ultrasonic Therapy , MethodsABSTRACT
This paper introduced a new structure of MRI guided P-HIFU therapy system and software implementation based on the current P-HIFU system and interface provided by MRI vendor. The tests showed that the system's software can achieve the appropriate form of treatment need.
Subject(s)
Magnetic Resonance Imaging , Software Design , Ultrasonic Therapy , MethodsABSTRACT
This paper provides a method of positioning the ultrasound probe in MR system. Machining 6 slots or cylinder perpendicular to the ultrasound probe surface on the edge of ultrasound probe as markers, 12 central cylinder ends are chosen as positioning points. By calculating these positioning points' coordinates in MR's coordinate system, the coordinate transformation between the ultrasound and MR coordinate system can be computed. Furthermore, by taking advantage of redundant information, calculating errors can be reduced and the precision can be improved.
Subject(s)
Magnetic Resonance Imaging , Ultrasonic Therapy , MethodsABSTRACT
Objective To discuss the risk factors of ventilator-associated pneumonia (VAP) in intensive care unit(ICU).Methods From January 2008 to June 2010,the clinical data of 145 patients with mechanical ventilation over 48 hours in ICU were analyzed prospectively,and the effect was observed.Results There were a total of 53 patients with VAP,and the incidence was 36.6％ (53/145).Thirty-three cases died,and the fatality rate was higher than that in non-VAP patients [62.3％ (33/53) vs.30.4％ (28/92)],and there was significant difference (P ＜0.05).Related factors analysis results showed that indwelling gastric tube,the use of antiacids,mechanical ventilation time,nutritional status,age ≥ 60 years and chronic diseases were the risk factors of VAP (P ＜ 0.05 or ＜ 0.01).Conclusion VAP has many risk factors and higher fatality rate in ICU,and comprehensive prevention measures should be adopted to prevent the occurrence of VAP.
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The FPGA-based phased-signal generator described in this paper meets the requirement of massive output channels and high resolution of HIFU. After experimental measurements, this phased-signal generator can output 256 channels of phase signals and each channel has a phase resolution of 2nS. The phased-signal generator also has many other advantages such as simple implementation method and high reliability.
Subject(s)
Equipment Design , High-Intensity Focused Ultrasound AblationABSTRACT
ObjectiveTo investigate the risk factors and pathogenic characteristics of catheterrelated infection (CRI) in intensive care unit (ICU),so as to find a better way for its treatment.Methods Retrospective analysis was performed on 247 deep-venous catheter (DVC) from January 2007 to December 2010.ResultsAmong 247 patients,positive results of 41 patients diagnosed CRI,negative results of 206 patients undiagnosed CRI.Compared with undiagnosed CRI patients,found the correlation of the underlying infectious diseases,indwelling time of catheter and puncture sites associated with CRI occurred(P ＜ 0.05 ).CRI major pathogen was gram-positive bacteria (58.5％,24/41 ),in which Staphylococcus epidermis was the major pathogenic bacteria(22.0％,9/41).The drug resistance occurred in most pathogen.Conclusions The occurrence of CRI is related with multiple clinical factors.The gram-positive bacteria is the major pathogen.The etiological monitor should be enforced in patients with DVC.
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Objective To determine the power-time-ablation scope correlogram of a water-cooled single needle electrode radiofrequency (RF) ablation system and to establish a theoretical basis for its practical application.Methods RF ablations were performed using a water-cooled single needle electrode radiofrequency ablation system developed by the authors using fresh ox liver as well as liver and muscles of healthy adult New Zealand white rabbits.The temperature of the ablation area was monitored using a multichannel thermometric system.The maximum ablation scope was determined by detecting the rim at which the temperature was no less than 50 °C.The specific absorption rate (SAR) of the isolated liver tissue was calculated.Results In the treatment voltage range of 100-130V,the process was smooth and steady.No impedance variation was obvious.The maximum diameter of a single ablation was 51 cm.With the treatment voltage at 140-170 V,a larger ablation area could be reached in less time,but eventually the impedance began to increase while the ablation area was no longer expanded.When the treatment voltage reached the range of 180-200 V the impedance almost always increased rapidly out of limits,and the treatment system stopped automatically.The measured SAR value was consistent with the theoretical value.Pathology confirmed that both liver tissue and muscle tissue manifested typical coagulative necrosis.Conclusions The power amplifier,cooling,thermometric and control sections of the RF ablation system worked stably,and the practical ablation effect met the design and clinical treatment requirements.
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This paper introduces HIFU system software based on a phased-array HIFU device. Combined with the database and computer graphics technology, this HIFU system software can be used to develop the therapy planning semi-automatically, implement the pilot project efficiently and accelerate the clinical studies.