Table 1 Baseline demographic data, surgical factors, and length of stay in unmatched and matched patients who did and did not undergo a dipyridamole-thallium scan

Age, mean ± SD, years

79.8 ± 8.3

74.7 ± 11.3

< 0.001

79.9 ± 8.3

0.901

Sex, n (%)

0.590

0.908

 Male

37 (32.7)

221 (30.2)

109 (32.2)

 Female

76 (67.3)

510 (69.8)

230 (67.8)

Body mass index, mean ± SD, kg/m²

22.6 ± 3.5

22.7 ± 4.1

0.774

22.5 ± 3.9

0.980

ASA grade, n (%)

< 0.001

0.010

 1

0 (0.0)

11 (1.5)

2 (0.6)

 2

5 (4.4)

185 (25.3)

57 (16.8)

 3

106 (93.8)

523 (71.5)

270 (79.6)

 4

1 (0.9)

10 (1.4)

8 (2.4)

Delay until surgery, mean ± SD, days

7.0 ± 12.4

2.4 ± 3.3

< 0.001

3.7 ± 4.2

< 0.001

Delay until surgery > 2 days, n (%)

110 (97.3)

352 (48.2)

< 0.001

127 (37.5)

< 0.001

 Ischemic heart disease

25 (22.1)

56 (7.7)

< 0.001

47 (13.9)

0.038

 CHF

6 (5.3)

27 (3.7)

0.431

20 (5.9)

0.816

 Valvular heart disease

11 (9.7)

18 (2.5)

0.001

17 (5.0)

0.071

 CVA

11 (9.7)

76 (10.4)

0.829

34 (10.0)

0.928

 Diabetes

44 (38.9)

216 (29.5)

0.044

123 (36.3)

0.613

 COPD

13 (11.5)

53 (7.3)

0.117

31 (9.1)

0.464

 RA

1 (0.9)

14 (1.9)

0.440

3 (0.9)

1.000

 Liver disease

2 (1.8)

37 (5.1)

0.121

7 (2.1)

1.000

 Renal disease

14 (12.4)

59 (8.1)

0.129

37 (10.9)

0.668

 Cancer

4 (3.5)

48 (6.6)

0.213

12 (3.5)

1.000

Anesthesia type, n (%)

0.071

0.597

 General

94 (83.2)

651 (89.1)

289 (85.3)

 Regional

19 (16.8)

80 (10.9)

50 (14.7)

Cemented stem, n (%)

65 (57.5)

297 (40.6)

< 0.001

199 (58.7)

0.826

Time in surgical theater, mean ± SD, min

125.9 ± 36.3

132.3 ± 44.5

0.142

125.5 ± 33.8

0.930