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High pressure ventilator alarms are triggered when the pressure required to deliver a breath exceeds a preset limit, indicating a potential obstruction or change in compliance. Water in the ventilator circuit can create resistance to airflow, which leads to increased pressure in the system. When moisture accumulates in the tubing, it can obstruct the passage of air and result in the alarm being activated.

In contrast, disconnected tubing typically leads to low pressure alarms rather than high pressure alarms, as the ventilator cannot effectively deliver the set tidal volume. Low tidal volume settings also do not directly contribute to increased pressures; instead, they are designed to minimize lung injury in certain situations. Finally, improper oxygen concentration primarily affects the gas mixture being delivered rather than the pressure dynamics within the ventilator circuit. Thus, the presence of water in the ventilator circuit is directly linked to triggering high pressure alarms due to the increased resistance it causes.