Direct readout of respiratory impedance

1976 ◽  
Vol 14 (5) ◽  
pp. 558-564 ◽  
Author(s):  
A. J. Ross ◽  
M. B. Raber ◽  
B. W. Kirk ◽  
D. H. Goldstein
Keyword(s):  
Respiratory Impedance ◽  
Direct Readout

Continuous Back-Titrations with Direct Readout. Application to EDTA Systems

1965 ◽  
Vol 37 (13) ◽  
pp. 1650-1653 ◽  
Author(s):  
W. J. Blaedel ◽  
R. H. Laessig
Keyword(s):  
Direct Readout

scholarly journals Day–Night Monitoring of Volcanic SO2 and Ash Clouds for Aviation Avoidance at Northern Polar Latitudes

2021 ◽  
Vol 13 (19) ◽  
pp. 4003
Author(s):  
Nickolay Krotkov ◽  
Vincent Realmuto ◽  
Can Li ◽  
Colin Seftor ◽  
Jason Li ◽  
...  
Keyword(s):  
Applied Sciences ◽  
Volcanic Ash ◽  
Infrared Imaging ◽  
Polar Regions ◽  
Collaborative Project ◽  
Finnish Meteorological Institute ◽  
Volcano Observatory ◽  
Software Packages ◽  
Direct Readout ◽  
Aerosol Index

We describe NASA’s Applied Sciences Disasters Program, which is a collaborative project between the Direct Readout Laboratory (DRL), ozone processing team, Jet Propulsion Laboratory, Geographic Information Network of Alaska (GINA), and Finnish Meteorological Institute (FMI), to expedite the processing and delivery of direct readout (DR) volcanic ash and sulfur dioxide (SO2) satellite data. We developed low-latency quantitative retrievals of SO2 column density from the solar backscattered ultraviolet (UV) measurements using the Ozone Mapping and Profiler Suite (OMPS) spectrometers as well as the thermal infrared (TIR) SO2 and ash indices using Visible Infrared Imaging Radiometer Suite (VIIRS) instruments, all flying aboard US polar-orbiting meteorological satellites. The VIIRS TIR indices were developed to address the critical need for nighttime coverage over northern polar regions. Our UV and TIR SO2 and ash software packages were designed for the DRL’s International Planetary Observation Processing Package (IPOPP); IPOPP runs operationally at GINA and FMI stations in Fairbanks, Alaska, and Sodankylä, Finland. The data are produced within 30 min of satellite overpasses and are distributed to the Alaska Volcano Observatory and Anchorage Volcanic Ash Advisory Center. FMI receives DR data from GINA and posts composite Arctic maps for ozone, volcanic SO2, and UV aerosol index (UVAI, proxy for ash or smoke) on its public website and provides DR data to EUMETCast users. The IPOPP-based software packages are available through DRL to a broad DR user community worldwide.

Measurement of low-frequency respiratory impedance in infants.

1996 ◽  
Vol 154 (1) ◽  
pp. 161-166 ◽  
Author(s):  
P D Sly ◽  
M J Hayden ◽  
F Peták ◽  
Z Hantos
Keyword(s):  
Low Frequency ◽  
Respiratory Impedance

Abstract WP432: Non-invasive Respiratory Impedance Enhances Cerebral Perfusion

Stroke ◽  
2017 ◽  
Vol 48 (suppl_1) ◽  
Author(s):  
Christopher G Favilla ◽  
Ashwin B Parthasarathy ◽  
John A Detre ◽  
Michael T Mullen ◽  
Scott E Kasner ◽  
...  
Keyword(s):  
Blood Flow ◽  
Cardiac Output ◽  
Flow Velocity ◽  
Cerebral Perfusion ◽  
Respiratory Impedance ◽  
Mean Flow ◽  
Non Invasive ◽  
End Tidal ◽  
High Level ◽  
Mean Flow Velocity

Background: Optimization of cerebral blood flow is the cornerstone of clinical management in a number of neurologic diseases, most notably ischemic stroke. Intra-thoracic pressure influences cardiac output and has the potential to impact cerebral blood flow (CBF). Here we aim to quantify cerebral hemodynamic changes in response to increased respiratory impedance using a non-invasive respiratory device. Methods: Cerebral perfusion was measured under varying levels of respiratory impedance (6cm H 2 0, 9cm H 2 0, and 12 cm H 2 0) in 20 healthy volunteers. Simultaneous measurements of microvascular CBF and middle cerebral artery mean flow velocity (MFV), respectively, were performed with optical diffuse correlation spectroscopy (DCS) and transcranial Doppler ultrasound (TCD). Results: At the high level of respiratory impedance, mean flow velocity increased by 6.4% compared to baseline (p=0.004), but changes in cortical CBF were smaller and non-significant (Figure). Heart rate, cardiac output, respiratory rate, and end tidal CO 2 remained stable during all levels of respiratory impedance. There was small increase in mean arterial blood pressure, 1.7% (p=0.006), at the high level of respiratory impedance. In a multivariable linear regression model accounting for end tidal CO 2 and individual variability, respiratory impedance was associated with increases in both mean flow velocity (coefficient: 0.49, p<0.001) and cortical CBF (coefficient: 0.13, p<0.001). Conclusions: Manipulating intrathoracic pressure via non-invasive respiratory impedance was well tolerated and produced a small but measurable increase in cerebral perfusion in healthy individuals. Future studies in acute ischemic stroke patients with impaired cerebral autoregulation is warranted in order to assess whether respiratory impedance is feasible as a novel non-invasive therapy for stroke.

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