Table 3 Comparison of flap perfusion measurement values separately for flap type.

From: Attached compared with unattached surface probes for monitoring flap perfusion in microvascular head and neck reconstruction: a feasibility study

Tissue depth

Timepoint of measurement

All

0 h

12 h

24 h

36 h

48 h

Blood flow (AU)

 RFFF

  2 mm

37.0 (35.0)*

31.5 (21.0)*

32.5 (41.0)*

27.5 (18.0)*

39.0 (24.0)*

32.5 (26.0)*

  3 mm

124.5 (134.0)

145.5 (121.0)

149.0 (125.0)

157.0 (129.0)

148.0 (124.0)

140.5 (128.0)

  8 mm

102.5 (95.0)

110.0 (55.0)

131.0 (58.0)

122.0 (110.0)

159.0 (89.0)

124.5 (81.0)

 ALTF

  2 mm

15.0 (14.0)*

12.0 (9.0)*

16.0 (7.0)*

16.5 (32.0)*

16.0 (16.0)*

16.0 (13.0)*

  3 mm

87.0 (63.0)

80.0 (33.0)

82.0 (80.0)

101.5 (73.0)

108.5 (76.0)

91.5 (53.0)

  8 mm

73.0 (34.0)

83.0 (31.0)

102.0 (93.0)

107.0 (129.0)

116.0 (115.0)

84.0 (88.0)

 FFF

  2 mm

19.5 (19.0)*

25.0 (45.0)*

15.5 (24.0)*

28.5 (37.0)*

27.0 (26.0)*

21.0 (25.0)*

  3 mm

92.5 (97.0)

107.0 (65.0)

94.0 (65.0)

109.0 (44.0)

112.5 (36.0)

106.5 (54.0)

  8 mm

101.5 (125.0)

126.5 (79.0)

122.5 (99.0)

145.0 (98.0)

165.5 (106.0)

136.5 (90.0)*

Hemoglobin concentration (AU)

 RFFF

  2 mm

69.0 (15.0)*

56.5 (19.0)*

60.0 (21.0)*

55.0 (16.0)*

54.5 (24.0)*

58.0 (21.0)*

  3 mm

91.0 (28.0)

82.5 (23.0)

82.5 (22.0)

85.5 (24.0)

85.5 (24.0)

86.5 (24.0)

  8 mm

38.5 (20.0)*

35.0 (14.0)*

39.0 (13.0)*

37.0 (14.0)*

40.5 (13.0)*

38.0 (13.0)*

 ALTF

  2 mm

43.0 (12.0)*

43.0 (15.0)*

42.0 (9.0)*

42.5 (15.0)*

38.5 (16.0)*

42.0 (13.0)*

  3 mm

63.5 (13.0)

55.5 (15.0)

59.5 (14.0)

59.5 (13.0)

60.5 (12.0)

60.0 (12.0)

  8 mm

30.0 (5.0)*

29.0 (6.0)*

29.0 (5.0)*

28.5 (15.0)*

31.0 (12.0)*

30.0 (7.0)*

 FFF

  2 mm

60.5 (14.0)*

58.5 (28.0)*

51.0 (17.0)*

50.5 (19.0)*

44.0 (22.0)*

51.5 (22.0)*

  3 mm

67.5 (29.0)

70.0 (28.0)

67.0 (26.0)

66.5 (24.0)

67.0 (27.0)

67.5 (22.0)

  8 mm

34.5 (5.0)*

37.5 (20.0)*

35.0 (13.0)*

32.0 (11.0)*

36.0 (11.0)*

35.0 (10.0)*

Hemoglobin oxygen saturation (%)

 RFFF

  2 mm

62.5 (22.0)

54.0 (26.0)

61.0 (30.0)

56.5 (32.0)*

54.5 (25.0)*

58.0 (21.0)*

  3 mm

68.0 (22.0)

67.5 (31.0)

65.0 (21.0)

69.5 (20.0)

70.5 (13.0)

67.5 (19.0)

  8 mm

74.0 (28.0)

69.5 (35.0)

70.5 (29.0)

74.0 (33.0)

67.5 (19.0)

71.0 (28.0)

 ALTF

  2 mm

33.5 (29.0)*

27.5 (18.0)*

33.0 (31.0)*

24.5 (34.0)*

13.0 (34.0)*

28.0 (31.0)*

  3 mm

48.0 (24.0)

40.0 (13.0)

47.0 (24.0)

48.0 (22.0)

47.0 (24.0)

47.0 (18.0)

  8 mm

71.0 (26.0)*

69.0 (25.0)*

69.5 (22.0)*

69.5 (23.0)*

69.5 (29.0)*

69.5 (23.0)*

 FFF

  2 mm

47.0 (49.0)

48.0 (36.0)

52.5 (62.0)

46.0 (24.0)

46.5 (38.0)

47.5 (37.0)*

  3 mm

57.0 (23.0)

51.0 (36.0)

51.0 (33.0)

52.0 (23.0)

54.0 (26.0)

54.0 (25.0)

  8 mm

67.5 (24.0)

70.5 (25.0)

64.5 (25.0)

69.5 (26.0)

71.5 (24.0)

68.5 (21.0)*

  1. Perfusion measurement values are indicated as median (with interquartile range) for each measurement time point (0 h postoperatively, 12 h postoperatively, 24 h postoperatively, 36 h postoperatively, 48 h postoperatively) and for all measurement time points combined (all) separately for flap type (RFFF, ALTF and FFF); *p < 0.05 corresponding to testing for differences between tissue measurement depths with Wilcoxon signed-rank test (2 mm or 8 mm vs. 3 mm).
  2. AU arbitrary units, RFFF radial free forearm flap, ALTF anterolateral thigh flap, FFF fibula free flap.
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