Certified Neuroscience Registered Nurse (CNRN) Practice Exam

For each risk factor exceeding one in PONV, how much does the risk increase?

1. 10%

2. 15%

3. 20%

4. 25%

The correct answer is: 20%

In the context of Postoperative Nausea and Vomiting (PONV), research indicates that for each additional risk factor present, the likelihood of experiencing PONV increases significantly. Specifically, it has been established that the risk increases by approximately 20% for each additional risk factor beyond the first one. This understanding is rooted in the performance of various studies that have assessed the contribution of multiple risk factors, such as patient demographics, type of surgery, and anesthetic techniques. Recognizing this increment validates clinical protocols aimed at risk stratification for PONV, allowing healthcare providers to implement preventative measures more effectively. Therefore, when assessing a patient's overall risk for PONV, a practitioner must consider how each risk factor correlates with a substantial increase in the likelihood of this common postoperative complication.