Propensity score analysis of stroke after off-pump coronary artery bypass grafting Gary L Grunkemeier, PhD, Nicola Payne, MPhiL, Ruyun Jin, MD, John R.

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Presentation transcript:

Propensity score analysis of stroke after off-pump coronary artery bypass grafting Gary L Grunkemeier, PhD, Nicola Payne, MPhiL, Ruyun Jin, MD, John R Handy, MD The Annals of Thoracic Surgery Volume 74, Issue 2, Pages 301-305 (August 2002) DOI: 10.1016/S0003-4975(02)03783-9

Fig 1 The number of papers from a Medline search using the text string “propensity score” according to the year of publication. This term has had a recent increase, although it is still not widely used. The Annals of Thoracic Surgery 2002 74, 301-305DOI: (10.1016/S0003-4975(02)03783-9)

Fig 2 Off-pump coronary artery bypass grafting (OPCAB) utilization by hospital. The percentage of off-pump coronary artery bypass graftings from 1988 to 2000 varied greatly among the nine hospitals. The total number of operations is shown below each bar. Hospitals with larger numbers of cases tended to have lower off-pump coronary artery bypass grafting usage. Hospitals were put into four groups depending on off-pump coronary artery bypass grafting usage; the low utilization hospitals (<10% off-pump coronary artery bypass grafting) were not used for the comparison of off-pump coronary artery bypass grafting to on-pump results. The Annals of Thoracic Surgery 2002 74, 301-305DOI: (10.1016/S0003-4975(02)03783-9)

Fig 3 Percentage of postoperative stroke by off-pump coronary artery bypass grafting (OPCAB) versus on-pump for hospitals with low, moderate, medium, and high off-pump coronary artery bypass grafting usage. In each group, the stroke percentage was lower for patients with off-pump coronary artery bypass grafting. The arrows indicate the mean values for all hospitals: 2.2% for on-pump and 1.1% for off-pump coronary artery bypass grafting. (CVA = cerebrovascular accident; Post-op = postoperative.) The Annals of Thoracic Surgery 2002 74, 301-305DOI: (10.1016/S0003-4975(02)03783-9)

Fig 4 Boxplots of the propensity scores for off-pump coronary artery bypass grafting (OPCAB) and on-pump patients, excluding the low usage hospitals. For each distribution, the interquartile range (the values for the 25th and 75th percentiles) form the lower and upper edges of the box. The horizontal line within the box indicates the median (50th percentile) and the outer horizontal lines at the end of the vertical lines indicate the maximum and minimum. The number of patients in each group is shown below the horizontal axis. The Annals of Thoracic Surgery 2002 74, 301-305DOI: (10.1016/S0003-4975(02)03783-9)

Fig 5 Boxplots of the propensity scores for off-pump coronary artery bypass grafting (OPCAB) and on-pump patients, excluding the low usage hospitals, grouped according to quintile of propensity score. There is fairly close agreement within each quintile. The number of patients in each group is shown below the horizontal axis. The Annals of Thoracic Surgery 2002 74, 301-305DOI: (10.1016/S0003-4975(02)03783-9)