dead space ventilation
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Author(s):  
Mrunmayee Bhagwat ◽  
Rohini M. Surve ◽  
Prathamesh Patwardhan

AbstractThe use of heat and moisture exchange filter (HMEF) has become a routine standard of care in general anesthesia (GA), more so, during the current COVID-19 pandemic times. However its routine use, especially in pediatric patients, has several issues. We report a case of increased dead space ventilation in a pediatric patient due to the presence of HMEF. Hypercapnia and its cause was instantly diagnosed with two capnography sampling lines placed at two ends of the HMEF.





2021 ◽  
pp. respcare.08786
Author(s):  
Michele Bertelli ◽  
Federica Fusina ◽  
Chiara Prezioso ◽  
Erika Cavallo ◽  
Niccolò Nencini ◽  
...  


2021 ◽  
Vol 66 (4) ◽  
pp. 703-704
Author(s):  
Richard H Kallet


Author(s):  
Marika Bajc ◽  
Fredrik Hedeer ◽  
Ari Lindqvist ◽  
Elin Trägårdh

V/P SPECT from 4 consecutive patients with COVID-19 suggests that ventilation and perfusion images may be applied to diagnose or exclude pulmonary embolism, verify nonsegmental diversion of perfusion from the ventilated areas (dead space ventilation) that may represent inflammation of the pulmonary vasculature, detect the reversed mismatch of poor ventilation and better preserved perfusion (shunt perfusion) in bilateral pulmonary inflammation and indicate redistribution of lung perfusion (antigravitational hyperperfusion) due to cardiac congestion. V/P mismatch and reversed mismatch may be extensive enough to diminish dramatically preserved matching ventilation/perfusion and to induce severe hypoxemia in COVID-19.





2020 ◽  
Vol 2 (9) ◽  
pp. e0208
Author(s):  
Beno W. Oppenheimer ◽  
Jan Bakker ◽  
Roberta M. Goldring ◽  
Katherine Teter ◽  
David L. Green ◽  
...  


2020 ◽  
Vol 46 (11) ◽  
pp. 2092-2093 ◽  
Author(s):  
Francesco Vasques ◽  
Barnaby Sanderson ◽  
Federico Formenti ◽  
Manu Shankar-Hari ◽  
Luigi Camporota


Author(s):  
Lisanne Roesthuis ◽  
Maarten van den Berg ◽  
Hans van der Hoeven

With the emergence of COVID-19 we are confronted with a new clinical picture of acute respiratory distress syndrome in the intensive care unit. In the majority of patients, the respiratory mechanics are very different from the “normal” ARDS patient. We measured transpulmonary pressure and dead space ventilation to assess the effects of high and low PEEP levels on lung compliance and ventilation-perfusion mismatching. Advanced respiratory mechanics were assessed in 14 patients. Compared to ARDS patients, lung compliance was relatively high (61 ± 5 mL/cmH2O). COVID-19 patients had high dead space ventilation and gas exchange impairment (Bohr 52 ± 3%; Enghoff modification 67 ± 2%; ventilatory ratio 2.24 ± 0.23). we show that higher PEEP levels decrease lung compliance and in most cases increase dead space ventilation, indicating that high PEEP levels probably cause hyperinflation in patients with COVID-19. We suggest using prone position for an extended period of time, and apply lower PEEP levels as much as possible.



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