Table 1 POQI- IX Individualized Right Heart Risk Assessment Tool (PIRRAT) for early identification of patients at risk for perioperative right heart dysfunction. The total PIRRAT score is calculated by adding the medical risk score (maximum of 4) to the surgical or procedural score (maximum of 6) and then multiplying that number by the functional status score. For example, a 72-year-old patient with a BMI of 45 and sleep apnea (3 points) undergoing single lung ventilation (1 point) and functional status of 3 will have a PIRRAT score of 3 + 1 = 4 × 3 = 12—a PIRRAT score of 12 warrants a BNP measurement for additional workup and assessment

From: Perioperative Quality Initiative (POQI) consensus statement on perioperative assessment of right ventricular function