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ST mode (GH-B20T/B25V): balances spontaneous/timed ventilation.
T mode (GH-B20T/B25T): fixed-interval ventilation.
S mode (GH-B20/B25V): patient-triggered.
APAP mode (GH-A20A/B25): auto-pressure adjustment.
CPAP mode (GH-A20/B20): continuous airway patency.
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