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- Title
- EFFECTIVENESS OF SUBGLOTTIC SUCTIONING IN THE PREVENTION OF VENTILATOR ASSOCIATED PNEUMONIA.
- Creator
-
Amato, Cody, Sole, Mary Lou, University of Central Florida
- Abstract / Description
-
Ventilator-associated pneumonia (VAP) is the leading healthcare-acquired infection among ventilated patients in intensive care units (ICU). VAP is a serious patient complication that results in increased hospital length of stay, cost, morbidity, and mortality. The accumulation of subglottic secretions above the endotracheal tube (ETT) cuff increases the risk of VAP, as these secretions may leak around the cuff of the ETT resulting in aspiration and an increased risk for infection. An in depth...
Show moreVentilator-associated pneumonia (VAP) is the leading healthcare-acquired infection among ventilated patients in intensive care units (ICU). VAP is a serious patient complication that results in increased hospital length of stay, cost, morbidity, and mortality. The accumulation of subglottic secretions above the endotracheal tube (ETT) cuff increases the risk of VAP, as these secretions may leak around the cuff of the ETT resulting in aspiration and an increased risk for infection. An in depth literature review was done to determine the effectiveness of subglottic secretion aspiration (by means of specialized ETT tubes with intrinsic suction lumens) in decreasing the incidence rate of VAP. Evidenced-based data were gathered from the CINAHL Plus with Full Text, PubMed, and Cochrane Database of Systematic Reviews databases for this review. VAP guidelines recommend subglottic secretion aspiration as a means to prevent its occurrence. However, important variables such as suction pressure, frequency, secretion viscosity, and ETT cuff pressure and volume need to be considered. The interaction among these variables determines the effectiveness of subglottic secretion removal. The goal of this review was to highlight these interactions and provide evidenced-based information for critical care nurses to expand their understanding of the dynamics involved in subglottic secretion aspiration and how to efficiently use this practice to prevent VAP.
Show less - Date Issued
- 2011
- Identifier
- CFH0003810, ucf:44775
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0003810
- Title
- A NEW DEVELOPMENT OF FEEDBACK CONTROLLER FOR LEFT VENTRICULAR ASSIST DEVICE.
- Creator
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Wang, Yu, Simaan, Marwan, University of Central Florida
- Abstract / Description
-
The rotary Left Ventricular Assist Device (LVAD) is a mechanical pump surgically implanted in patients with end-stage congestive heart failure to help maintain the flow of blood from the sick heart. The rotary type pumps are controlled by varying the impeller speed to control the amount of blood flowing through the LVAD. One important challenge in using these devices is to prevent the occurrence of excessive pumping of blood from the left ventricle (known as suction) that may cause it to...
Show moreThe rotary Left Ventricular Assist Device (LVAD) is a mechanical pump surgically implanted in patients with end-stage congestive heart failure to help maintain the flow of blood from the sick heart. The rotary type pumps are controlled by varying the impeller speed to control the amount of blood flowing through the LVAD. One important challenge in using these devices is to prevent the occurrence of excessive pumping of blood from the left ventricle (known as suction) that may cause it to collapse due to the high pump speed. The development of a proper feedback controller for the pump speed is therefore crucial to meet this challenge. In this thesis, some theoretical and practical issues related to the development of such a controller are discussed. First, a basic nonlinear, time-varying cardiovascular-LVAD circuit model that will be used to develop the controller is reviewed. Using this model, a suction index is tested to detect suction. Finally we propose a feedback controller that uses the pump flow signal to regulate the pump speed based on the suction index and an associated threshold. The objective of this controller is to continuously update the pump speed to adapt to the physiological changes of the patient while at the same time avoiding suction. Simulation results are presented under different conditions of the patient activities. Robustness of the controller to measurement noise is also discussed.
Show less - Date Issued
- 2010
- Identifier
- CFE0003296, ucf:48497
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0003296
- Title
- Suction Detection and Feedback Control for the Rotary Left Ventricular Assist Device.
- Creator
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Wang, Yu, Simaan, Marwan, Qu, Zhihua, Haralambous, Michael, Kassab, Alain, Divo, Eduardo, University of Central Florida
- Abstract / Description
-
The Left Ventricular Assist Device (LVAD) is a rotary mechanical pump that is implanted in patients with congestive heart failure to help the left ventricle in pumping blood in the circulatory system. The rotary type pumps are controlled by varying the pump motor current to adjust the amount of blood flowing through the LVAD. One important challenge in using such a device is the desire to provide the patient with as close to a normal lifestyle as possible until a donor heart becomes available...
Show moreThe Left Ventricular Assist Device (LVAD) is a rotary mechanical pump that is implanted in patients with congestive heart failure to help the left ventricle in pumping blood in the circulatory system. The rotary type pumps are controlled by varying the pump motor current to adjust the amount of blood flowing through the LVAD. One important challenge in using such a device is the desire to provide the patient with as close to a normal lifestyle as possible until a donor heart becomes available. The development of an appropriate feedback controller that is capable of automatically adjusting the pump current is therefore a crucial step in meeting this challenge. In addition to being able to adapt to changes in the patient's daily activities, the controller must be able to prevent the occurrence of excessive pumping of blood from the left ventricle (a phenomenon known as ventricular suction) that may cause collapse of the left ventricle and damage to the heart muscle and tissues.In this dissertation, we present a new suction detection system that can precisely classify pump flow patterns, based on a Lagrangian Support Vector Machine (LSVM) model that combines six suction indices extracted from the pump flow signal to make a decision about whether the pump is not in suction, approaching suction, or in suction. The proposed method has been tested using in vivo experimental data based on two different LVAD pumps. The results show that the system can produce superior performance in terms of classification accuracy, stability, learning speed, and good robustness compared to three other existing suction detection methods and the original SVM-based algorithm. The ability of the proposed algorithm to detect suction provides a reliable platform for the development of a feedback control system to control the current of the pump (input variable) while at the same time ensuring that suction is avoided.Based on the proposed suction detector, a new control system for the rotary LVAD was developed to automatically regulate the pump current of the device to avoid ventricular suction. The control system consists of an LSVM suction detector and a feedback controller. The LSVM suction detector is activated first so as to correctly classify the pump status as No Suction (NS) or Suction (S). When the detection is (")No Suction("), the feedback controller is activated so as to automatically adjust the pump current in order that the blood flow requirements of the patient's body at different physiological states are met according to the patient's activity level. When the detection is (")Suction("), the pump current is immediately decreased in order to drive the pump back to a normal No Suction operating condition. The performance of the control system was tested in simulations over a wide range of physiological conditions.
Show less - Date Issued
- 2013
- Identifier
- CFE0005070, ucf:49956
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFE0005070
- Title
- AN EVALUATION OF TRACHEOSTOMY CARE ANXIETY RELIEF THROUGH EDUCATION AND SUPPORT (T-CARES): A PILOT STUDY.
- Creator
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Crosby, William, Sole, Mary Lou, University of Central Florida
- Abstract / Description
-
Background: Home care of a patient with a tracheostomy after surgery for head and neck cancer requires the caregiver to be proficient with new equipment and required skills. The responsibility of managing an artificial airway, may lead to an increase in caregiver anxiety. Education of caregivers varies; it is often a 1:1 impromptu instruction provided by the patient's nurse and/or respiratory therapist. The purpose of this study was to evaluate the effect of the T-CARES course on caregiver...
Show moreBackground: Home care of a patient with a tracheostomy after surgery for head and neck cancer requires the caregiver to be proficient with new equipment and required skills. The responsibility of managing an artificial airway, may lead to an increase in caregiver anxiety. Education of caregivers varies; it is often a 1:1 impromptu instruction provided by the patient's nurse and/or respiratory therapist. The purpose of this study was to evaluate the effect of the T-CARES course on caregiver anxiety and tracheostomy suctioning competency. Method: A quasi-experimental non-randomized control group design was used. The independent variable was method of instruction (T-CARES versus standard). Dependent variables were caregiver anxiety and tracheostomy suction competence. Caregivers (n=12) self selected into groups based on availability to attend T-CARES course. The control group was to receive the unit-based standard of education. The experimental group participated in the T-CARES course. Only one person chose to be in the control group; therefore, data were analyzed for the experimental group only (N=11). The T-CARES course, created by the researcher, was standardized and instructor-led; it incorporated media and simulated practice. Caregiver anxiety for both groups was obtained before (State/Trait Anxiety) and after (State Anxiety) tracheostomy care instruction was provided. Tracheostomy suctioning competence was assessed using a standardized checklist for participants in the T-CARES study group only. Demographic data were summarized with frequencies and descriptive statistics. Given the small sample size, non-parametric statistics were used for data analysis. Results: Data were analyzed from the experimental group only (n=11). The majority of caregivers were women (n=7), white/caucasian (n=10), married (n=8), employed full time (n=7), and were high school graduates or higher (n=10). The mean age of participants was 50.8 years. Seven of the participants reported previous caregiver experience. Mean score of caregiver trait anxiety was 36.8. Mean caregiver state anxiety score was 50.5 before, and 34.3 after the T-CARES intervention. A Related-Samples Wilcoxon Signed Rank Test was performed on the pre and post T-CARES intervention state anxiety scores. The T-CARES intervention significantly reduced anxiety (p=.008). Tracheostomy suctioning competency for 9 of the participants was evaluated upon completion of T-CARES. Mean score was10.8 skills performed correctly out of a possible 14. Caregivers' responses regarding their biggest fear/concern about tracheostomy care included "not doing it right," "trach coming out or being blocked," "hurting the patient," and "not being able to help in an emergency." Participants' suggestions for future improvements were creation of a Spanish language course and the addition of supplementary training to include CPR, First Aid, and the management of feeding tubes. Discussion: Research supported the hypothesis that the T-CARES course would be successful in reducing state anxiety. The T-CARES course also had a positive impact on tracheostomy suctioning competency, though without a control group it is difficult to quantify the effect. The continued development and dissemination of T-CARES to all tracheostomy patients and their caregivers may ease their transition home. The views expressed are those of the author and do not reflect the official policy or position of the US Air Force, Department of Defense or the US Government.
Show less - Date Issued
- 2012
- Identifier
- CFH0004138, ucf:44824
- Format
- Document (PDF)
- PURL
- http://purl.flvc.org/ucf/fd/CFH0004138
