Method, system and software for protective ventilation
AssigneeThe Lung Barometry Sweden AB
InventorsOla Stenqvist, Stefan Lundin
Life of this patent
Estimating the term…
Abstract
A system including a breathing apparatus and a processor is configured to raise a first positive end-expiratory pressure PEEP level to at least a second PEEP level above said first PEEP level and subsequently lowering said second PEEP level to said first PEEP level and to calculate a lung mechanics equation relating total lung volume above functional residual capacity (FRC) to transpulmonary pressure (PTP) of a lung connected to said breathing apparatus, based on a change in end-expiratory lung volume (DEELV) between said first PEEP level and said second PEEP level.
Claims17
A system including a breathing apparatus and a processing unit configured to:
- in response to determining it is clinically possible to raise a positive end-expiratory pressure (PEEP) value above a first PEEP level, raise the PEEP level to a second PEEP level above said first PEEP level and subsequently lower said PEEP level from said second PEEP level to said first PEEP level,
- in response to determining it is not clinically possible to increase said PEEP level above the first PEEP level, lower said PEEP to a third PEEP level below said first PEEP level and subsequently raise said PEEP level from said third PEEP level to said first PEEP level,
- adjust a tidal volume (VT) setting of said breathing apparatus to be equal to an absolute value of a change in end-expiratory lung volume (ΔEELV) between said first PEEP level and said second PEEP level or said third PEEP level, and
- calculate a lung pressure volume (P/V) curve relating total lung volume above functional residual capacity (FRC) to a transpulmonary pressure (PTP) of a lung connected to said breathing apparatus, based on said ΔEELV.
A system including a breathing apparatus and a processing unit configured to:
- raise a first positive end-expiratory pressure (PEEP) level to at least a second PEEP level above said first PEEP level,
- determine an increase in end expiratory lung volume (ΔEELVup) and subsequently lowering said second PEEP level back to said first PEEP level,
- determine a decrease in EELV (ΔEELVdown),
- calculate a mean change in end-expiratory lung volume (ΔEELVmean) between said first PEEP level and said second PEEP level as (ΔEELVup+ΔEELVdown)/2,
- set a tidal volume (VT) to be equal to ΔEELVmean, and
- calculate lung mechanics and chest wall mechanics equations relating the lung volume between the end-expiratory lung volume at the first PEEP level and the end-expiratory lung volume at the second PEEP level to a transpulmonary pressure (PTP) of a lung connected to said breathing apparatus, at said tidal volume equal to ΔEELVmean.
A system including a breathing apparatus and a processing unit configured to:
- lower a positive end-expiratory pressure (PEEP) level from a first PEEP level to a second PEEP level below said first PEEP level in response to determining it is not clinically possible to increase said PEEP level above the first PEEP level,
- determine a decrease in end expiratory lung volume (ΔEELVdown) and subsequently increase said PEEP level back to said first PEEP level,
- determine an increase in EELV (ΔEELVup),
- calculate a mean change in end-expiratory lung volume (ΔEELVmean) between said first PEEP level and said second PEEP level as (ΔEELVup+ΔEELVdown)/2,
- set a tidal volume (VT) to be equal to ΔEELVmean, and
- calculate a lung mechanics and chest wall mechanics equations relating the lung volume between the end-expiratory lung volume at the first PEEP level and the end-expiratory lung volume at the second PEEP level to transpulmonary pressure (PTP) of a lung connected to said breathing apparatus, at said VT equal to ΔEELVmean.
Dependencies are inferred from the claim text.