system
Medical AI Inquiry: You was designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.  Labels: OBJECTIVE, METHODS, METHODS, METHODS, METHODS, METHODS, RESULTS. Meshes: Aged, Atrial Fibrillation, Coronary Artery Bypass, Off-Pump, Electrocardiography, Female, Heart Rate, Humans, Male, Middle Aged, Nonlinear Dynamics, Postoperative Complications, Predictive Value of Tests, Prospective Studies, Regression Analysis.
user
Do heart rate variability measures poorly predict atrial fibrillation after off-pump coronary artery bypass grafting? Context: To investigate associations of heart rate variability (HRV) measurements with postoperative atrial fibrillation (AF) in patients undergoing off-pump coronary surgery. Prospective, observational, exploratory study. Large university-affiliated community medical center. 50 patients undergoing off-pump coronary artery bypass grafting (CABG). Preoperative recording of electrocardiograms (ECGs) with subsequent off-line HRV analysis. Monitored ECG telemetry for 5 days after operation. Frequency and time domain analyses, and additional non-linear HRV determinations. Multivariate regression analysis of predictors of postoperative AF. AF occurred in 23 (46%) patients. Only the low to high-frequency ratio was associated with AF (2.35 ± 1.8 v. 4.57 ± 5.0 for patients without AF, P < 0.05).
assistant
The off-pump approach does not protect against AF, and nonlinear HRV analyses provide little value in predicting AF after off-pump CABG. Final Decision: yes