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| I:E Ratio |
Inspiratory time: Expiratory
Ratio - The ratio of inspiratory phase time to expiratory
phase time. By convention a one is in the numerator or
denominator such that neither the numerator nor the denominator
of the resulting fraction is a number less than one. For
example: 1:2, 1:4.5, 3:1, 1:1. |
| ICU |
Intensive Care Unit |
| Ideal Gas Law |
A relation among the four
thermodynamic variables [Volume (V), absolute temperature
(T), pressure (P), and mass, given in moles (n)] that
govern the behavior of an ideal gas. This relation has
the following form: PV = nRT in which R is the universal
gas constant. |
| Impedance |
A complex number that expresses
the combined effects of resistance, compliance and inertance
on sinusoidally-varying breathing variables at a given
frequency. The combination of the latter two parameters
incorporates the frequency into a term called the reactance. |
| IMV |
Intermittent Mandatory Ventilation
- A ventilator operating mode that permits spontaneous
breathing in the interval between preset ventilator-assisted
breaths. |
| Inertance (I) |
The constant of proportionality
between the pressure difference across a mass and the
acceleration of the volume it displaces as it moves. Typically
associated with the mass of the gas in the airways and
the mass of the airway walls and surrounding parenchyma,
all of which undergo volume accelerations during high
frequency ventilation. |
| Inspiratory
Triggering Response Time |
The time delay from the
satisfaction of the trigger condition to the initiation
of an assisted breath. |
| Inspiratory (Phase)Time
(TI) |
The time for the inspiratory
phase of a breath. |
| Inspiratory Pause Time
(TIP) |
The time interval from the
cessation of inspiratory flow to the start of expiratory
flow. |
| Inspiratory Phase |
The portion of a breath
from the beginning of inspiration to the beginning of
expiration. |
| Inspiratory Pressure |
The pressure that is produced
in the patient circuit causing inspiratory flow. |
| Inspiratory Relief Valve |
unidirectional valve that
permits air to flow to the patient during a spontaneous
breath in which the inspiratory flow available from the
ventilator is inadequate. |
| Inspiratory Triggering
Flow |
A set level of flow that
must be drawn into the patient airway by the patient to
initiate the inspiratory phase of a ventilator-assisted
breath (See Trigger
Flow.) |
| Inspiratory Triggering
Pressure |
(See Trigger
Pressure.) |
| Inspiratory
Triggering Volume |
The volume of gas that must
be inspired by the patient to trigger an assisted breath. |
| Inspiratory Work of
Breathing |
(See Work
of Breathing.) |
| IPAP |
Inspiratory Positive Airway
Pressure - Airway pressure maintained above ambient during
inspiratory phase of the breath. |
| ISO 9000 |
Standards dictating the
establishment and maintenance of quality systems in the
design and manufacture of products. |
