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real time pulmonary graphics

Roberto De Ponti, Raffaella Marazzi, Lorenzo A Doni, Jacopo Marazzato, Claudia Baratto, Jorge A Salerno-Uriarte
AIMS: During pulmonary vein isolation (PVI), even if operators are aware of the contact force (CF), its values may greatly vary and the impact of cardiac rhythm has not been thoroughly investigated yet. This study aims at assessing the actual values of CF, the applications with suboptimal CF, and the impact of cardiac rhythm on CF during PVI. METHODS AND RESULTS: Twenty patients undergoing point-by-point PVI with a CF-sensing catheter were considered. CF target was between 6 and 40 g...
January 8, 2017: Europace: European Pacing, Arrhythmias, and Cardiac Electrophysiology
Chung-Hui Lin, Huey-Dong Wu, Pei-Ying Lo, Jih-Jong Lee, Chen-Hsuan Liu
OBJECTIVES: For the purpose of applying a barometric whole-body plethysmography (BWBP) device as a routine clinical tool in client-owned cats, the objective of this study was to evaluate the methodological importance of simultaneous visual inspection (SVI) of graphic tracing. METHODS: To investigate the effect of SVI on the results obtained, 50 client-owned cats were included. Breath-by-breath analysis was conducted with BWBP software, and a commonly used rejection setting was chosen for automatic elimination (AE) of non-breath artefactual waveforms, according to tidal volume (TV), inspiratory and expiratory time, and the difference between inspiratory and expiratory volumes...
October 2016: Journal of Feline Medicine and Surgery
Mark C Mammel, Steven M Donn
Real-time pulmonary graphics now enable clinicians to view lung mechanics and patient-ventilator interactions on a breath-to-breath basis. Displays of pressure, volume, and flow waveforms, pressure-volume and flow-volume loops, and trend screens enable clinicians to customize ventilator settings based on the underlying pathophysiology and responses of the individual patient. This article reviews the basic concepts of pulmonary graphics and demonstrates how they contribute to our understanding of respiratory physiology and the management of neonatal respiratory failure...
June 2015: Seminars in Fetal & Neonatal Medicine
Ritesh Agarwal, Arjun Srinivasan, Ashutosh N Aggarwal, Dheeraj Gupta
BACKGROUND AND AIM: Real-time endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) is a minimally invasive technique for diagnosis of mediastinal lymphadenopathy. Although most studies have reported the utility of EBUS-TBNA in malignancy, its use has been extended to benign conditions including sarcoidosis. Herein, we perform a systematic review and meta-analysis of studies reporting the diagnostic yield and safety of EBUS-TBNA in sarcoidosis. METHODS: We searched the PubMed and EmBase databases for relevant studies published from 2004 to 2011, and included studies that have reported the diagnostic yield of EBUS-TBNA in sarcoidosis...
June 2012: Respiratory Medicine
J S Schildkraut, N Prosser, A Savakis, J Gomez, D Nazareth, A K Singh, H K Malhotra
PURPOSE: Pulmonary nodules present unique problems during radiation treatment due to nodule position uncertainty that is caused by respiration. The radiation field has to be enlarged to account for nodule motion during treatment. The purpose of this work is to provide a method of locating a pulmonary nodule in a megavolt portal image that can be used to reduce the internal target volume (ITV) during radiation therapy. A reduction in the ITV would result in a decrease in radiation toxicity to healthy tissue...
November 2010: Medical Physics
Ka-Wai Kwok, George P Mylonas, Loi Wah Sun, Mirna Lerotic, James Clark, Thanos Athanasiou, Ara Darzi, Guang-Zhong Yang
In robot-assisted procedures, the surgeon's ability can be enhanced by navigation guidance through the use of virtual fixtures or active constraints. This paper presents a real-time modeling scheme for dynamic active constraints with fast and simple mesh adaptation under cardiac deformation and changes in anatomic structure. A smooth tubular pathway is constructed which provides assistance for a flexible hyper-redundant robot to circumnavigate the heart with the aim of undertaking bilateral pulmonary vein isolation as part of a modified maze procedure for the treatment of debilitating arrhythmia and atrial fibrillation...
2009: Medical Image Computing and Computer-assisted Intervention: MICCAI ..
Michael A Becker, Steven M Donn
Real-time pulmonary graphics allow breath-to-breath assessment of pulmonary mechanics and patient-ventilator interaction. It allows the clinician to customize ventilator settings based on pathophysiology and patient response, and may enable detection of complications before they become clinically apparent. Graphics also provide objective information about the efficacy of pharmacologic agents and changes in patient status over time.
March 2007: Clinics in Perinatology
M Pérez, J Mancebo
Monitoring the mechanical properties (both static and dynamic) of the respiratory tract is essential for the diagnosis and prognosis of the disease causing any condition and to take the pertinent therapeutic decisions. These measurements can maintain a lung function in optimum conditions during mechanical ventilation and choose the best time to disconnect the patient. Until recently, monitoring the respiration of patients undergoing mechanical ventilation required sophisticated and complicated apparatuses or difficult techniques...
December 2006: Medicina Intensiva
William C Shoemaker, Charles C J Wo, Kevin Lu, Li-Chien Chien, Peter Rhee, David Bayard, Demetrios Demetriades, Roger W Jelliffe
The aims of this study were to develop and to test a noninvasive hemodynamic monitoring system that could be applied to combat casualties to supplement conventional vital signs, to use an advanced information system to predict outcomes, and to evaluate the relative effectiveness of various therapies with instant feedback information during acute emergency conditions. In a university-run inner city public hospital, we evaluated 1,000 consecutively monitored trauma patients in the initial resuscitation period, beginning shortly after admission to the emergency department...
September 2006: Military Medicine
William C Shoemaker, Charles C J Wo, Li-Chien Chien, Kevin Lu, Nasrollah Ahmadpour, Howard Belzberg, Demetrios Demetriades
OBJECTIVES: The aim of this study was to compare a recently developed and improved noninvasive hemodynamic monitoring system with the conventional invasive monitoring by pulmonary artery catheterization (PAC) in acute emergency trauma patients. METHODS: In a large, university-run, inner city public hospital, we monitored 993 trauma patients noninvasively; 262 of these were simultaneously monitored with both noninvasive hemodynamic and invasive PAC monitoring. The noninvasive monitoring was begun shortly after admission to the emergency department and the invasive PAC monitoring was started in the operating room, or as soon as the patient arrived in the intensive care unit...
October 2006: Journal of Trauma
Zheng-yang Yu, Shu-sen Zheng, Lei-ting Chen, Xiao-qian He, Jian-jun Wang
This research studies the process of 3D reconstruction and dynamic concision based on 2D medical digital images using virtual reality modelling language (VRML) and JavaScript language, with a focus on how to realize the dynamic concision of 3D medical model with script node and sensor node in VRML. The 3D reconstruction and concision of body internal organs can be built with such high quality that they are better than those obtained from the traditional methods. With the function of dynamic concision, the VRML browser can offer better windows for man-computer interaction in real-time environment than ever before...
July 2005: Journal of Zhejiang University. Science. B
Lluís Blanch, Francesca Bernabé, Umberto Lucangelo
Severe airflow obstruction is a common cause of acute respiratory failure. Dynamic hyperinflation affects tidal ventilation, increases airways resistance, and causes intrinsic positive end-expiratory pressure (auto-PEEP). Most patients with asthma and chronic obstructive pulmonary disease have dynamic hyperinflation and auto-PEEP during mechanical ventilation, which can cause hemodynamic compromise and barotrauma. Auto-PEEP can be identified in passively breathing patients by observation of real-time ventilator flow and pressure graphics...
January 2005: Respiratory Care
Hugo Devlieger, Thierry Bayet, Jacques Lombet, Stéphane Naudé, Christian Eugène
Most modern neonatal ventilators have now a built-in flow sensor and, as a spin-off of their mechanical action, provide some information about lung function characteristics as compliance and resistance after computation of the flow and pressure signals. Additionally, respiratory graphics as volume-pressure and flow-volume plots can be displayed. In clinical practice, however, they are rarely used to refine the ventilator setting. A nonconventional flow-pressure plot is presented in this article, constructed from the volume or flow, and pressure outputs of a Babylog 8000 (Dräger, Lübeck, Germany)...
December 2002: Seminars in Perinatology
Harvey A Zar, Frances E Noe, James E Szalados, Michael D Goodrich, Michael G Busby
OBJECTIVE: A repetitive graphic display of the single breath pulmonary function can indicate changes in cardiac and pulmonary physiology brought on by clinical events. Parallel advances in computer technology and monitoring make real-time, single breath pulmonary function clinically practicable. We describe a system built from a commercially available airway gas monitor and off the shelf computer and data-acquisition hardware. METHODS: Analog data for gas flow rate, O2, and CO2 concentrations are introduced into a computer through an analog-to-digital conversion board...
April 2002: Journal of Clinical Monitoring and Computing
J L Heckman, J Hoffman, T H Shaffer, M R Wolfson
The purpose of this project was to develop and test computer software and control algorithms designed to operate a tidal liquid ventilator. The tests were executed on a 90-MHz Pentium PC with 16 MB RAM and a prototype liquid ventilator. The software was designed using Microsoft Visual C++ (Ver. 5.0) and the Microsoft Foundation Classes. It uses a graphic user interface, is multithreaded, runs in real time, and has a built-in simulator that facilitates user education in liquid-ventilation principles. The operator can use the software to specify ventilation parameters such as the frequency of ventilation, the tidal volume, and the inspiratory-expiratory time ratio...
May 1999: Biomedical Instrumentation & Technology
A Adams
Implementing the knowledge and skills obtained from the pulmonary function laboratory is useful in the assessment of pulmonary function in the ventilated patient. In the critically ill patient, special constraints and problems (such as safety and ability to cooperate) are important considerations for the therapist performing the testing. Basic measurements such as MIP, VC, VT, MVV, VE, and respiratory rate are commonly made to assess weanability. For the difficult-to-wean patient, WOB, PTP, P0.1 and O2COB may be of potential value in selected patients...
June 1997: Respiratory Care Clinics of North America
A Bishop, P White, P Oldershaw, R Chaturvedi, C Brookes, A Redington
This study examines the use of conductance catheters to assess human right ventricular volume. Ten patients undergoing diagnostic cardiac catheterisation underwent right heart catheterisation with a conductance catheter and micromanometer, and a thermodilution catheter before and after fluid loading. Parallel wall conductance (Vc), and the multiplication factor relating conductance and thermodilution derived stroke volumes (å) were derived at each steady state. Pressure-volume cycles were analyzed at steady state and during fluid loading...
February 1997: International Journal of Cardiology
K Itoh
The main blood flow velocity patterns in the LVOT and RVOT were recorded by pulsed Doppler echocardiography in 28 normal healthy cases, in two athletes, and in 85 patients with atrial septal defects, pulmonary regurgitation, tetralogy of Fallot, aortic regurgitation, mitral stenosis, aortic stenosis, mitral regurgitation, hypertrophic cardiomyopathy, ischemic heart disease, and pulmonary hypertension. Blood flow velocities were displayed using a graphic system to form a real time sonogram, using Fast Fourier Transformation...
March 1985: Angiology
H A Schwid
A simulator of general anesthesia is described. It consists of an integrated set of physiologic computer models and a graphics display. The model predicts many of the physiologic and pharmacodynamic changes associated with general anesthesia. It is a multiple model consisting of circulatory, respiratory, pharmacokinetic, and pharmacodynamic models and their interactions. The model can account for many pathologic states of the cardiorespiratory system plus poor renal and hepatic function. Both intravenous and inhalation agents are included...
February 1987: Computers and Biomedical Research, An International Journal
J Gil, A M Marchevsky, H Jeanty
We have studied the feasibility of using interactive computerized morphometric methods for the quantitation of septal thickness in the lung with the goal of introducing objective criteria for the diagnosis and grading of pulmonary fibrosis and edema. After reviewing available methods, we have decided in favor of linear intercept measurements of septal profiles which are limited to the tissue and therefore not affected by the level of lung inflation. Our method consisted in generating a graphic overlay of parallel lines over a real time video display of lung tissue...
April 1988: Laboratory Investigation; a Journal of Technical Methods and Pathology
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