When is invasive monitoring indicated during anesthesia?

• A. Use invasive monitoring as appropriate
• B. Use invasive monitoring in every case
• C. Never use invasive monitoring
• D. Only if the patient requests

Answer: (A)

Invasive monitoring is used when the benefits of continuous, precise physiologic data and reliable access for treatment outweigh the risks, and the decision is based on the patient's risk factors and the planned procedure. It isn’t something to do in every case; you tailor it to the situation.

Arterial lines give beat-to-beat blood pressure and allow frequent blood gas sampling, which is especially helpful in hemodynamically unstable patients, major blood loss, or procedures where tight BP control is crucial. Central venous access provides reliable venous access for vasoactive medications and can help monitor venous pressure and fluid status in complex cases. In more complex or high-risk surgeries—such as major cardiac, vascular, neurosurgical procedures, extensive trauma, or liver transplantation—the need for continuous, real-time data and rapid intervention often makes invasive monitoring appropriate.

So the best approach is to use invasive monitoring as appropriate, not universally or never, and not based on patient request.