This is a single-centre, prospective study to determine the correlation and comparative thresholds between N-terminal pro-brain natriuretic peptide (NT ProBNP, Roche) and brain natriuretic peptide (BNP, Abbott) tests. The study population will include patients assessed in presurgical screening (PSS) or on the day of surgery (DOS) who are presenting for elective surgery requiring a minimum of one-night admission, and are a) \>65 years old, b) RCRI ≥1 or c) \>45 years old with significant cardiovascular disease (coronary artery disease, peripheral arterial disease, cerebral vascular disease, congestive heart failure, obstructive intracardiac disease such as severe aortic stenosis, severe mitral stenosis or severe hypertrophic obstructive cardiomyopathy). Informed consent will be obtained at PSS or on the DOS by study staff. High sensitivity troponin I measurements will be taken on postoperative day (POD) 0, 1 and 2, and the outcome of MINS (high sensitivity troponin \> 30 ng/L) or vascular death will be determined by an assessor blinded to BNP/NT ProBNP results at postoperative day (POD) 30. Given a sample size of 431 patients and based upon previous local data that found approximately 500 patients qualifying for BNP testing in a six month period, the investigators predict data collection to be completed in approximately six months.
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BNP/NT ProBNP Conversion Formula
Timeframe: Within three months before surgery