Which symptom should prompt immediate assessment in a client recovering from lung surgery?

A sudden increase in respiratory rate is a critical symptom that necessitates immediate assessment in a client recovering from lung surgery. This increase can indicate various complications, such as respiratory distress, pneumothorax, or other issues related to the surgery that may require prompt intervention. Monitoring respiratory rate is essential in post-operative care, especially in lung surgery patients, as it can provide insight into the respiratory status and effectiveness of lung function after the procedure.

While minor pain at the incision site is a common experience following surgery, it typically falls within the expected range of post-operative symptoms and does not usually signify an urgent problem. Slight dizziness while standing may be related to factors like dehydration or the effects of anesthesia but is less urgent compared to changes in breathing patterns. Stable oxygen saturation levels are a good indicator of adequate lung function and gas exchange, meaning that they wouldn't trigger immediate concern like changes in respiratory rate would. Thus, a sudden increase in respiratory rate is a clear signal for immediate evaluation and intervention to prevent severe complications.