Question special

The Canadian guidelines on perioperative risk assessment and management differ from the American guidelines on several points. For example, Canadian guidelines recommend measuring BNP preoperatively to improve risk prediction in patients 65 and older, patients aged between 45-64 and patients with an RCRI score of 1 or more. They also recommend biomarker testing rather than noninvasive tests to enhance risk assessment. Do any of our experts use biomarker testing? Is there a reason the American guidelines do not include this?