Active clinical trials for "Respiratory Aspiration"

Introduction: The inspiratory muscle training (IMT) has showed great benefits to the respiratory, autonomic system, and mainly to the improvement of physical performance in healthy subjects. The latter is related to the improvement of respiratory muscle strength, decreased of dyspnoea, peripheral fatigue and delay in activation of muscle metaboreflex during exercise. However, there is no consensus about the best training load to IMT, because the prescription has been done only using percentage of the maximal inspiratory pressure (MIP), and 60% of MIP has been the most used. Therefore, the IMT prescription protocol that takes into account the respiratory muscle strength and endurance can provide additional benefits to protocols commonly applied, once that respiratory muscle differs from the other muscles due to its greater muscle endurance. In the sense, the IMT using inspiratory critical pressure (PThC) comes up with an alternative, since the PThC calculation considers these characteristics. Objective:To evaluate the effect of the IMT, using PThC, on cardiovascular, respiratory, metabolic and autonomic responses in recreational cyclists and compare it to a IMT using 60% of MIP. Methods: Thirty men recreational cyclists (20-40 years), will be randomized to placebo group (PG, n = 10), PThC group (PTHCG, n = 10) and 60% of MIP group (60G, n = 10), taking into account the age and functional aerobic capacity. All subjects will perform the following evaluations: cardiovascular autonomic tests [heart rate variability (HRV) and blood pressure variability (BPV) at rest and after active postural change], pulmonary function testing, respiratory muscle strength (RMS) test, cardiopulmonary exercise testing (CPET), incremental respiratory muscle endurance test (iRME) [maximum respiratory pressure sustained for 1 minute (PThMAX)] and constant respiratory loads test (95%, 100% and 105% of PThMAX), both using an linear inspiratory load resistor (PowerBreathe K5). The PThC will be obtained from the linear regression using the time(TLIM) of and load of each constant test (95%, 100% and 105% PThMAX). During evaluations, the ECG (BioAmp FE132), blood pressure (BP), using Finometer Pro (Finapress Medical Systems) and respiration (Marazza) signals will be acquired. The signals will be coupled by data acquisition and analysis device (Power Lab 8/35) and sampled at 1000 Hz. Moreover, the oxyhemoglobin, deoxyhemoglobin and total hemoglobin responses will be measured by near-infrared spectroscopy (NIRS) (Oxymon MKIII), sampled at 250Hz. The IMT will be performed for 11 weeks (3 times/week, 1-hour duration). The session will consist of 5-min warm-up (50% of the training load) and 3 sets of 15 minutes (breathing against 100% of the training load) with 1-min interval between them. Heart rate and BP will be monitored in all training sessions. The RMS, iRME, respiratory constant load tests and CPET will be performed before and after the training, and in the 3rd and 7th week (for training load adjustment). The pulmonary function testing and the cardiovascular autonomic tests will be performed only before and after training. The data will be analyzed by specific statistical tests (parametric and nonparametric) according to the data distribution and their respective variances. Significance will be set at p<0.05. Expected results: It is expected that the training performed by PTHCG, when compared to training performed by 60G and PG, promotes: greater improvementin workload (Watts) and peak oxygen uptake (VO2peak); increasing in MIP and iRME; decreasing of dyspnoea and peripheral fatigue; delay in activation of muscle metaboreflex in the CPET and iRME; improvement incardiac parasympathetic autonomic modulation and reducing cardiac and peripheral sympathetic modulation. Moreover, it is expected that the results can provide information for a better understanding of the responses obtained by the PThC training in the different evaluated systems. In addition, these results will allow the use of this method by health professionals as a new assessment tool and IMT prescription.

Access to medical care for patients with breathing disorders during sleep is a major problem for Canadians. Recently, there has been increasing interest in how health care providers who are not physicians can help to improve access to medical care for these patients, but it is unclear whether patients with severe sleep-disordered breathing who receive care from these non-physician providers have the same response to treatment as patients who receive care from physicians. Since these severe have a high risk of developing cardiac and respiratory complications and of being hospitalized, an initiative to improve access such as the use of non-physician providers could be of great benefit to individual patients and the health care system. The objectives of this project are: to determine whether patients with severe breathing disorders during sleep have the same response to treatment when cared for by non-physician health care providers (respiratory therapists) as they do when cared for by physicians; to determine the effects of non-physician health care provider treatment to patient access; to determine health care utilization and related costs associated with non-physician health care provider treatment.

This study compares two methods of gas delivery in a dental setting: 1) demand-driven (DD) and 2) free-flow (FF). Nitrous oxide and oxygen sedation (NOS) is a common form of minimal sedation for adult and paediatric patients undergoing dental procedures. In order for NOS devices to be utilized during dental treatment, dentists must be able to provide gas flow to the patient, and subsequently scavenge used and unused gasses. Gas delivery is via a nasal mask, since the oral cavity must be accessible to the dentist throughout treatment. Current devices for NOS in the dental setting utilize a free-flow gas method, where nitrous oxide and oxygen are released continuously from their tanks. The flow rate is set by the dentist according to the patient's minute ventilation needs, and unused and exhaled gasses are scavenged via the nasal mask. The demand-driven gas flow method, where inspiration triggers gas flow, has been used successfully in other medical settings, such as in obstetrics, medical emergencies, and for patients with chronic obstructive pulmonary disease. However, in these settings the mask used covers both the nose and mouth, and patients can trigger the demand-driven method through inspiration of the nose or mouth. The demand-driven gas flow method has a significant gas-sparing advantage over the free-flow method. With a demand-driven method, the patient dictates the flow rate and gas is only delivered when they are inspiring, compared to the free-flow method which provide gas flow throughout inspiration and expiration. However, the demand-driven method have not been studied in a dental setting where flow can only be triggered through the nose. It is therefore unknown whether it is feasible or comfortable for patients to trigger a demand-driven method nasally when their mouth is open during dental treatment. This study will aim to assess the feasibility and comfort of a nasal demand-driven gas delivery method utilizing 100% oxygen in healthy, adult participants in a simulated dental setting. If the device is feasible and comfortable with 100% oxygen in a simulated dental setting, future research can be conducted to assess its use for NOS for dental treatment.

The aim of the research project is to evaluate the breathing effort using the Work of Breathing (WoB) and Pressure-Time Product (PTP) parameters, depending on the increasing flow resistance. The research project is concerned with assessing the increased (imposed) breathing effort using the Work of Breathing (iWoB) and the Pressure-Time Product (iPTP). The main hypothesis tested is the differential effect of flow resistance on iWoB and iPTP parameters in spontaneous breathing of healthy probands.

There is no significant difference about success rate of two devices.

Background: fluctuation of cerebral blood flow and oxygenation in neonates who undergo intensive care is an important risk factor for risk of neurodevelopmental impairment. Near infrared spectroscopy (NIRS) allow direct measurements of cerebral tissue oxygenation. Automated Fraction of Inspired Oxygen (FiO2) adjustment can maintain arterial oxygen saturation (SpO2) within a target range and may reduce risk of fluctuation of cerebral oxygenation. Aim of this study: to evaluate the efficacy of automated FiO2 adjustment in maintaining SpO2 within a target range and in reducing the risk of cerebral tissue hypo-oxygenation due to SpO2 fluctuations in preterm infants on invasive or non invasive respiratory support with supplemental oxygen.

This research aims to evaluate the effects of inspiratory muscle training (IMT) on blood pressure, in inspiratory muscle mechanoreflex, autonomic cardiovascular control in subjects with hypertension.

There are data supporting a possible increase in the prevalence of High Blood Pressure (HBP) in pediatric patients with Sleep Disorder Breathing (SDB). Adeno-tonsillectomy has proven to be an effective treatment in the correction of nocturnal respiratory events in the majority of patients. Our objective is to determine the presence of HBP in pediatric patients with SDB and the impact of adenotonsillar surgery on its correction. Methodology: 286 children (4-18 years old) will be included consecutively referred for suspected SDB. Variables: a) Clinical history; b) Anthropometric variables: weight, height, body mass index, neck, hip and waist perimeter c) Chervin questionnaire d) polysomnography (PSG) for the SDB assessment and e) for the HBP evaluation, ambulatory blood pressure measurement (ABPM) and pulse transit time (PTT) will be performed during 24h. In control group (not SDB) and patients with indication for medical treatment, the same tests will be repeated six months after the baseline visit. In patients with surgery indication, ABPM and PTT will be performed just before the surgical treatment and ABPM, PTT and PSG six months after the intervention. In a subgroup of patients, will also assess the presence of subclinical organic damage produced by HBP: blood markers (creatinine / glomerular filtration), urine (albuminuria / proteinuria), electrocardiogram and echocardiography (left ventricle hypertrophy).

The purpose of this study is to assess chemoreflex gain on exercise.

High inspiratory oxygen fractions are known to induce oxidative stress and lipid peroxidation. The degrading products of oxidative stress induced lipid peroxidation are in part volatile and appear in breath where they can be measured non-invasively. However, there is lack of knowledge on the correlation of blood and breath biomarkers of oxidative stress. This study aims to investigate the effects of a high inspiratory oxygen fraction on oxidative stress in healthy volunteers. The primary outcome is the appearance of exhaled breath biomarkers of oxidative stress by electrochemical sensors and ion mobility mass spectrometry. Secondary outcomes are changes in oxidative stress biomarkers in blood and their relationship to breath biomarkers.