19 research outputs found
Wireless Acoustic Communication With a Miniature Pressure Sensor in the Pulmonary Artery for Disease Surveillance and Therapy of Patients With Congestive Heart Failure
No full textObjectivesThe purpose of this study was to examine the feasibility of repeated pulmonary artery (PA) pressure determinations using a newly developed acoustic wireless implanted communication system.BackgroundCongestive heart failure management strategies based on monitored intracardiac hemodynamics in patients receiving the best-available therapy may improve outcome. Although electromagnetic communication requires a large antenna for sufficient energy transfer, acoustic energy readily penetrates deep into the body, uses little energy, and uses small internal transducers for bidirectional operation.MethodsA miniature device was developed and implanted using right heart catheterization. The ability to obtain PA pressure from the implant using wireless acoustic communication was examined in 8 pigs and 10 patients with congestive heart failure. Macroscopic and histopathologic examinations were performed at 6 months after implantation. The accuracy of PA pressure measurement was determined by comparison with simultaneous pressures from a Millar catheter.ResultsThe device was successfully implanted in the PA using right heart catheterization. There were no implantation or later device-related complications. Pulmonary artery pressure tracings were repeatedly obtained from all implants. Normal reactions to intravascular implant were observed macroscopically and in histologic sections. Standard deviations of the difference between implant and Millar PA diastolic pressure were 1.45 and 1.2 mm Hg (animals and humans, respectively). Data were useful for patient management.ConclusionsThis pilot study demonstrates, for the first time, that acoustic wireless communication with a miniature implanted sensor is feasible and provides repeated PA pressure measurement. This feat makes possible multiple novel applications for monitoring and therapeutic interventions based on measurements from deeply implanted devices
Host-guest interaction of tryptophane with acid-functionalized calix[4]pyrrole: a fluorescence-based study
No full textFunctionalized calix[4]pyrroles are at forefront of host-guest aided molecular sensors. They offer unique platform for flexible functionalization to develop receptors suitable for different applications. In this context, calix[4]pyrrole derivative (TACP) was functionalized with an acidic group to investigate its binding behavior with different amino acids. The acid functionalization facilitated host-guest interactions through hydrogen bonding and increase the solubility of ligand in 90% aqueous media. The results indicated that TACP exhibited significant fluorescence enhancement in the presence of tryptophan while no considerable changes were observed with other amino acids. The other complexation properties such as LOD and LOQ were determined to be 25 µM and 22 µM respectively with 1:1 stoichiometry. In addition, the proposed binding phenomena were further confirmed through computational docking studies and NMR complexation study. Overall, this work highlights the potential of acid functionalization in developing molecular sensors for amino acid detection using calix[4]pyrrole derivatives. Communicated by Ramaswamy H. Sarma</p
CORONARY SINUS REDUCER™ RETAINS PATENCY AND EFFICACY AT TWELVE YEARS: A FIRST IN MAN PROSPECTIVE CARDIAC CT ANGIOGRAPHY OUTCOME STUDY
No full textLONG-TERM FOLLOW-UP TO EVALUATE THE SAFETY OF THE NEOVASC REDUCER A DEVICE-BASED THERAPY FOR CHRONIC REFRACTORY ANGINA
No full textREAL WORLD CLINICAL OUTCOMES OF SIROLIMUS COATED BALLOON IN CORONARY ARTERY LESIONS: RESULTS FROM SINGLE CENTRE STUDY
No full textKnowledge, attitude and behavioural survey regarding oral hygiene practices amongst rural and urban population of Ahmedabad City, Gujarat: A comparative study
No full textIntroduction: It is thought that oral hygiene can be influenced by socioeconomic status to some extent. People with higher socioeconomic status often have better access to resources and opportunities, which can impact their oral hygiene practices and overall dental health. Hence, this study assessed knowledge, attitude and behaviour regarding oral health amongst the adult population in urban and rural populations of Ahmedabad city. Materials and Methods: This cross-sectional study was carried out amongst the urban and rural segments of Ahmedabad district. The zones of the district and participants were selected by systematic random sampling method. The participants in the Ahmedabad district were selected, and those 204 who fulfilled the inclusion criteria were considered. A validated questionnaire was designed in our study so as to satisfy the quality, attain the objective of our study and make the study effective. Results: About 70.42% of the rural population and 77.30% of the urban population has good knowledge, while only 36.1% of the rural population and 47.16% of the urban population had a positive attitude towards oral hygiene practices. 61.27% of the rural population and 64.81% of the urban population showed positive behaviour. The absence of correlation was identified between knowledge-attitude and attitude-behaviour. Conclusion: It has been found that a massive number of the urban population possess a higher level of knowledge and attitude towards oral health than the rural population. No linear positive correlation was seen in knowledge, attitude and behaviour towards oral health
Hysterectomy for uterine adenocarcinoma in the elderly: Tumor characteristics, and long-term outcome
No full textComputational choreography: dissecting the dance of hydrogen bonding and π–π stacking in the fluorescence discrimination mechanism of ciprofloxacin with supramolecular assembly
No full textThe detailed binding insight between the fluorophore and analyte plays a pivotal role in the design of an efficient chemosensor for water pollution. In this study, we designed a picolinic acid-functionalized calix[4]pyrrole ligand (PCACP). When testing out the fluorescence study with selected antibiotics, we observed remarkable enhancement of fluorescence spectra in the presence of ciprofloxacin, singling out the PCACP_Ciprofloxacin complex. The detailed binding mechanism is explored via computational methods including molecular docking and dynamics, DFT (density functional theory) and NBO (Natural Bonding Orbital) analysis. The result of this study provides the comprehensive insight into the involvement of functionalized group of PCACP and ciprofloxacin antibiotic. The results of the computational findings are further explored through NMR complexation study, which corroborate the computational findings. With the limit of detection calculated at 18 µM, we carried out the water sample analysis, which shows promising results. The outcome of this research provides a new, effortless fluorescence approach to monitor the presence of ciprofloxacin in water. In the presence of the ciprofloxacin antibiotic, the fluorescence spectra of PCACP experience remarkable enhancements. This complexation phenomenon is studied through different computational and experimental methods. Communicated by Ramaswamy H. Sarma</p
Reversal of slow or no-reflow during percutaneous tranluminal coronary angioplasty using boluses of intracoronary adenosine and sodium nitroprusside in combination
No full textCoronary Sinus Reducer Stent for the Treatment of Chronic Refractory Angina Pectoris A Prospective, Open-Label, Multicenter, Safety Feasibility First-in-Man Study
No full textObjectivesThis study sought to evaluate the safety of the Coronary Sinus Reducer (Neovasc Medical, Inc., Or Yehuda, Israel) as a potential alternate therapy for patients with refractory angina who are not candidates for conventional revascularization procedures.BackgroundIncreased coronary sinus (CS) pressure can reduce myocardial ischemia by redistribution of blood from nonischemic to ischemic territories. The Coronary Sinus Reducer is a percutaneous implantable device designed to establish CS narrowing and to elevate CS pressure. In preclinical experiments, implantation of the Reducer was safe and was associated with improved ischemic parameters. In the present study, the safety and feasibility of the Coronary Sinus Reducer was evaluated in patients with refractory angina who were not candidates for revascularization.MethodsFifteen coronary artery disease patients with severe angina and reversible ischemia were electively treated with the Reducer. Clinical evaluation, dobutamine echocardiography, thallium single-photon emission computed tomography, and administration of an angina questionnaire were performed before and 6 months after implantation. Cardiac computed tomography was performed 2 days and 6 months after implantation.ResultsAll procedures were completed successfully. No procedure-related adverse events occurred during the periprocedural and the follow-up periods. Angina score improved in 12 of 14 patients. Average Canadian Cardiovascular Society score was 3.07 at baseline and 1.64 at follow-up (n = 14, p < 0.0001). Stress-induced ST-segment depression was reduced in 6 of 9 patients and was eliminated in 2 of these 6 (p = 0.047). The extent and severity of myocardial ischemia by dobutamine echocardiography and by thallium single-photon emission computed tomography was reduced (p = 0.004 [n = 13] and p = 0.042 [n = 10], respectively).ConclusionsImplantation of the Coronary Sinus Reducer is feasible and safe. These findings, along with the clinical improvement observed, support further evaluation of the Reducer as an alternative treatment for patients with chronic refractory angina who are not candidates for coronary revascularization
