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MMV – Mandatory Minute Ventilation
VM
tNessun respiro spontaneo Inizio della ventilazione
spontanea
Ventilazione spontanea
sufficiente
MMV
E’ una ventilazione mandatoria non convenzionale, può
essere a volume o a pressione
Garantisce un volume minuto costante sulla base delle
impostazioni di Vt e fr
Prevede un feedback dai parametri ventilatori del
paziente e modifica il suo comportamento
automaticamente, sulla base di questo feedback
Principio di funzionamento
Impostazione Vt e fr
VM da garantire
è raggiunto?
Erogazione atti per
raggiungere VM minimo
Nessuna erogazione di
atti
No Si
Respiro mandatorio
Respiro spontaneo con Psupp
VM = Vt * fr
ΔPsupp negli atti spontanei
Se Vtspont*frspont => VMset : nessun intervento
Se Vtspont*frspont < VMset : atti mandatori fino a VMset
Concepita per:
svezzamento automatico: interviene se il paziente
non ventila, non interviene se il paziente ha ventilazione
sufficiente
svezzamento respiratorio: migliora l’efficienza della
ventilazione senza aumento non necessario del lavoro
respiratorio
pazienti con variazione drive respiratorio
(neuromuscolari o posto operati ) che necessitano, o sono
soggetti a (code di) sedazione profonda
Attenzione a:
monitorare la qualità del respiro spontaneo (alte
frequenze e bassi tidal o viceversa)
impostare allarmi adeguati sul volume minuto
massimo per evitare ventilazione minuto eccessiva
Riferimenti e letture
Tecniche di ventilazione artificiale – G. Torri, E. Calderini – Fogliazza editore
Mandatory Minute Volume – A.M. Hewlett, A.S. Platt, V.G. Terry – Anesthesia,
1977, Volume 32, pag. 163-169
Emilio Carmignotto
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MMV - Mandatory Minute Ventilation