Implementation by Means of Microprocessor Techniques for the Measurement of Total Respiratory Impedance during Spontaneous Breathing1

2015 ◽  
pp. 135-143 ◽  
Author(s):  
F. J. L�nds�r ◽  
J. Nagels ◽  
K. P. van de Woestijne
Keyword(s):  
Respiratory Impedance

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

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.

Abstract TMP87: Non-Invasive Respiratory Impedance Enhances Cerebral Perfusion in Acute Stroke Patients

Stroke ◽  
2018 ◽  
Vol 49 (Suppl_1) ◽  
Author(s):  
Christopher G Favilla ◽  
Rodrigo M Forti ◽  
Ahmad Zamzam ◽  
John A Detre ◽  
Michael T Mullen ◽  
...  
Keyword(s):  
Acute Stroke ◽  
Cerebral Perfusion ◽  
Respiratory Impedance ◽  
Stroke Patients ◽  
Non Invasive

scholarly journals Perfusion Enhancement with Respiratory Impedance After Stroke (PERI-Stroke)

2019 ◽  
Vol 16 (4) ◽  
pp. 1296-1303 ◽  
Author(s):  
Christopher G. Favilla ◽  
Rodrigo M. Forti ◽  
Ahmad Zamzam ◽  
John A. Detre ◽  
Michael T. Mullen ◽  
...  
Keyword(s):  
Respiratory Impedance
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