When a client's oxygen saturation drops to 89% during suctioning, the nurse's immediate response should be to:

When a client's oxygen saturation drops to 89% during suctioning, the most appropriate response is to stop the suctioning process and provide the client with 100% oxygen. This action is critical for several reasons.

First, suctioning can be an invasive procedure that can temporarily disrupt a patient's ability to breathe effectively, leading to decreased oxygen saturation levels. When you notice a drop in saturation, it indicates the patient is not receiving sufficient oxygen, which can cause further complications if not immediately addressed. By stopping suctioning, you prevent further irritation and allow the airway to stabilize, which is crucial in maintaining the client's airway and breathing.

Second, administering 100% oxygen helps to quickly replenish the oxygen levels in the blood. It acts as an immediate intervention to counteract the effects of lowered oxygen saturation and ensures that the client is receiving adequate oxygen to support their vital functions.

This approach not only prioritizes the safety and well-being of the client but also aligns with basic principles of emergency care, which emphasize stabilizing a patient's condition before proceeding with further interventions. Providing oxygen can help increase the saturation levels back to an acceptable range, allowing for a more effective and safe continuation of care.