Face masks and respirators are used to filter inhaled air, which may contain airborne droplets high particulate matter (PM) concentrations. The act as a barrier the exhaled change nasal airflow characteristics air-conditioning function of nose. This study aims investigate dynamics during respiration with without an N95 respirator driven by through cavity assess effect on breathing conditions re...

Stimulation of cerebral vasculature using hypercapnia has been widely used to study cerebral vascular reactivity (CVR), which can be expressed as the quantitative change in cerebral blood flow (CBF) per mm Hg change in end-tidal partial pressure of CO2 (PETCO2). We investigate whether different respiratory manipulations, with arterial spin labeling used to measure CBF, lead to consistent measur...

Changes in cerebral perfusion and CO2 cerebrovascular reactivity during and immediately after a sojourn at high altitude remain unclear but may be critical for acclimatization. The aim of the present study was to assess the effects of 6days at 4350m on cerebral perfusion and cerebrovascular reactivity (CVR) to CO2 by arterial spin labeling (ASL) magnetic resonance imaging at sea level and to co...

background: because of airway stimulations during the bronchoscopy and lack of direct access to the airway, preferred method of anesthesia for rigid bronchoscopy is already controversial. in this study we compared inhalation anesthesia with total intravenous anesthesia (tiva) for rigid bronchoscopy. method and materials: 30 patients aged 2-6 years were chosen divided on two same groups. anesthe...

Inhalation therapy involves two types of adherence: adherence to the drug and procedures for inhalation device. Recent increases in range inhaled medications available have expanded treatment options,

The purpose of this article is to quantify the public health risk associated with inhalation of indoor airborne infection based on a probabilistic transmission dynamic modeling approach. We used the Wells-Riley mathematical model to estimate (1) the CO2 exposure concentrations in indoor environments where cases of inhalation airborne infection occurred based on reported epidemiological data and...

The effect of hyperoxygenation with carbogen (95% O2 + 5% CO2) and 100% oxygen inhalation on partial pressure of oxygen (pO2) of radiation-induced fibrosarcoma (RIF-1) tumor was investigated. RIF-1 tumors were innoculated in C3H mice, and aggregates of oximetry probe, lithium phthalocyanine (LiPc), was implanted in each tumor. A baseline tumor pO2 was measured by electron paramagnetic resonance...

Patients with mitral stenosis are known to have a diminished ventilatory response to inhalation of carbon dioxide, as compared with normal subjects. Reduced responsiveness of the respiratory centre (Pauli, Noe, and Coates, 1960) and/or altered mechnical properties of the lungs are assumed to be responsible for this change (Bruderman, Braun, and Rogel, 1965). The ventilatory response to CO2 inha...

Background: Conflicting results from previous studies on the effect of bronchial challenge on ven¬ tilatory patterns in asthmatics may be due to airflow obstruction present before induction of bron¬ chospasm onset, as well as the different degrees of bronchoconstriction induced. Purpose and methods: We examined the ventilatory response to stepwise increments in respiratory resistance (Rrs) indu...