An umbrella review of the surgical performance of Harmonic ultrasonic devices and impact on patient outcomes

BMC Surgery

Table 2 Summary systematic reviews comparing Harmonic to advanced bipolar devices

Study	No. of patients	Effect estimate (95% CI)	p-value
Operating Time
Colectomy (Tou, 2011) [15]	181	MD: -3.22 (-15.31, 8.87)	0.6
Thyroidectomy (Cannizzaro, 2016) [16]	474	WMD: -9.67 (-20.27, 0.92)	0.074
Length of Stay
Colectomy (Tou, 2011) [15]	181	MD: 0.41 (-0.49, 1.31)	0.38
Thyroidectomy (Cannizzaro, 2016) [16]	284	WMD: -0.01 (NR)	0.778
Blood Loss
Colectomy (Tou, 2011) [15]	181	MD: -3.74 (-19.04, 11.55)	0.63
Thyroidectomy (Cannizzaro, 2016) [16]	322	WMD: -3.61 (-13.6, 6.39)	0.48
Overall Complications
Colectomy (Tou, 2011) [15]	208	RR: 0.81 (0.46, 1.4)	0.45
Thyroidectomy (Cannizzaro, 2016) [16]	474	OR: 1.47 (0.98, 2.12)	0.061

Mean difference is defined as (Harmonic value – comparator value) and relative risk is defined as (Harmonic value / comparator value)
Abbreviations: CI confidence interval, MD mean difference, OR odds ratio, RR risk ratio, WMD weighted mean difference

ISSN: 1471-2482