Which of the following factors could contribute to a high pressure alarm on a mechanical ventilator? Select All that Apply.

Mechanical ventilation alarms are critical safety features that alert the nurse to changes in airway resistance or lung compliance. A high-pressure alarm indicates increased resistance to airflow, which can be caused by airway obstruction, bronchospasm, secretions, or patient-related factors such as biting the endotracheal tube. Prompt identification of the cause is essential to restore adequate ventilation and prevent hypoxia or barotrauma. Rationale: A. Stable respiratory rate per minute as prescribed does not contribute to a high-pressure alarm. A set and stable respiratory rate indicates that the ventilator is functioning as intended and does not reflect increased airway resistance or obstruction. This finding is unrelated to causes of increased airway pressure. B. Cuff pressure maintained above 30 cm H₂O is not a direct cause of a high-pressure ventilator alarm, although it may increase the risk of tracheal mucosal injury. High-pressure alarms are typically triggered by airway obstruction or reduced lung compliance rather than cuff inflation levels. Normal cuff pressures are maintained to prevent air leaks and aspiration. C. Excess secretions in the airway can obstruct airflow through the endotracheal tube, increasing resistance and triggering a high-pressure alarm. Secretions narrow the airway lumen, making ventilation more difficult and requiring suctioning to restore patency. This is a common and reversible cause of ventilator alarms. D. Bronchospasm increases airway resistance due to constriction of bronchial smooth muscles, which reduces airflow and elevates airway pressures. This condition is commonly seen in clients with asthma or reactive airway disease. It requires prompt intervention with bronchodilators to relieve airway obstruction. E. Biting the endotracheal tube can physically obstruct airflow, leading to increased resistance and activation of the high-pressure alarm. This is often seen in inadequately sedated clients or those emerging from sedation. Use of bite blocks or sedation adjustment may be necessary to prevent recurrence.