Solutions
Guaranteed Tidal Volume with Volume Control Ventilation
Volume Control Ventilation Modes
Volume control ventilation defines the volume administered to the patient (tidal volume Vt as the control variable). Airway pressure results from the compliance of the lungs and the inhaled volume.
A volume-controlled mode thus ensures that the patient will receive a specific tidal volume. The pressure limit ensures that there are no peak pressures that could harm the lungs.
WEINMANN Ventilators Feature the Following Volume Control Ventilation Modes:
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IPPV (Intermittent Positive Pressure Ventilation): Volume control mandatory ventilation
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S-IPPV (Synchronized Intermittent Positive Pressure Ventilation): Assisted volume control ventilation with a trigger time slot of 100% of the expiratory time
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SIMV (Synchronized Intermittent Mandatory Ventilation): Assisted volume control ventilation with a trigger time slot of 20% of the expiratory time
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SIMV + ASB (Synchronized Intermittent Mandatory Ventilation + Assisted Spontaneous Breathing): Assisted volume control ventilation with optional pressure support
IPPV
Intermittent Positive Pressure Ventilation
The IPPV mode is used for mandatory, volume control ventilation with a fixed tidal volume and fixed frequency. This mode is used on patients who have no spontaneous respiration. However, a spontaneously breathing patient can breathe deeply and freely during expiration.
Once the maximum ventilation pressure (pMax) has been reached, the device maintains the pMax until the end of the inspiratory time and then switches to expiration. It is therefore possible that the set tidal volume will not be fully applied if the maximum ventilation pressure (pMax) has been reached during inspiration.
S-IPPV
Synchronized Intermittent Positive Pressure Ventilation
The S-IPPV mode is a volume control ventilation mode with variable mandatory minute volume (MV). Throughout the entire expiratory phase, a trigger is active which enables the patient to trigger a new mechanical breath.
This means the patient has the option of increasing the respiratory rate and therefore the minute volume MV, and adapting these to his/her needs. As a rule this mode is used on patients who have inadequate spontaneous respiration.
SIMV
Synchronized Intermittent Mandatory Ventilation
The SIMV mode is used for volume control ventilation with a fixed mandatory minute volume. The patient can breathe spontaneously between the mandatory mechanical breaths and thereby increase the minute volume. During spontaneous respiration, the mandatory mechanical breath is synchronized with the patient’s breathing. The mandatory minute volume and the mandatory respiratory rate remain unchanged.
Once the maximum ventilation pressure (pMax) has been reached, the device maintains the pMax until the end of the inspiratory time and then switches to expiration. It is therefore possible that the set tidal volume will not be fully applied if the maximum ventilation pressure (pMax) has been reached during inspiration.
SIMV + ASB
SIMV: Synchronized Intermittent Mandatory Ventilation
ASB: Assisted Spontaneous Breathing
The SIMV + ASB mode is used for volume control ventilation with a fixed mandatory minute volume (MV). The patient can breathe spontaneously between the mandatory mechanical breaths and thereby increase the minute volume.
During spontaneous respiration, the mandatory mechanical breath is synchronized with the patient’s breathing. The mandatory minute volume and the mandatory respiratory rate remain unchanged.
