Closure of the Cystic Duct by Ultrasonic Energy: An Electron-microscopic and Biomechanical Study in Man

A comparative study of ultrasonic scalpel (US) versus conventional metal clips for closure of the cystic duct in laparoscopic cholecystectomy (LC): A meta-analysis

BACKGROUND

laparoscopic cholecystectomy (LC) has become the gold standard surgery for benign gallbladder diseases. Metal clips are conventionally used to secure the cystic duct and artery, while monopolar electrocautery (ME) predominates during laparoscopic dissection. ultrasonic scalpel (US) has already been explored for sealing the cystic duct and artery as a sole instrument, which has been regarded as a reasonable alternative to clips. The aim of this study was to investigate the safety and effectiveness of US versus clips for securing the cystic duct during LC.

METHODS

We identified eligible studies in PubMed, Medline, Cochrane Library, Embase, and SpringerLink up to 1st May 2018, together with the reference lists of original studies. Meta-analysis was conducted using STATA 14.0. Q-based chi-square test and the I statistics were utilized to assess heterogeneity among the included studies. A P-value below .05 was set for statistical significance. Forest plots of combined Hazard ratios (HRs) with 95% confidence intervals (CIs) were also generated.

RESULTS

Eight studies met eligibility criteria in this meta-analysis eventually. A total of 1131 patients were included, of whom 529 were contained in the US group, compared to 602 in the clips group, which showed a significant difference (P = .025) without substantial statistical heterogeneity (I = 0.0%). No statistical significance was revealed regarding age (I = 0.0%, P = .957), and sex (I = 0.0%, P = .578) between both groups. The operative time and hospital stay in the US group were significantly shorter than that in the clips group, with I = 95.0%, P = .000 and I = 72.8%, P = .005, respectively. Concerning conversion (I = 48.6%, P = .084), perforation (I = 12.0%, P = .338), along with bile leakage (I = 0.0% P = .594), and overall morbidity (I = 19.1%, P = .289), comparison between both groups exhibited no statistical significance.

CONCLUSIONS

US enabled shorter operative time and hospital stay during LC, compared with clips. Additionally, US was comparable to clips regarding conversion, perforation, along with bile leakage and overall morbidity. Therefore, our meta-analysis concluded that US is clinically superior to the conventional clips in some aspects, or is at least as safe and effective as them, concerning closure of the cystic duct and artery.

Ultrasonic versus electrosurgical device for laparoscopic cholecystectomy: A systematic review with meta-analysis and trial sequential analysis

BACKGROUND

Ultrasonic and electrosurgical energy dissectors are main dissecting devices widely used for the laparoscopic cholecystectomy. Trial sequential analyses can establish whether firm evidence favoring a specific device has been reached from accumulated literature. To explore this, we performed a meta-analysis and trial sequential analyses.

METHODS

PubMed, Embase, and the Cochrane Library were searched from inception to October 2016. The primary outcome was operative time. The secondary outcomes included adverse events during operation, postoperative complications, intra-abdominal collection, hospital stay, hospital costs, and sick leave or time to full recovery. Relative risks (RRs) were calculated for dichotomous outcomes and mean differences (MDs) for continuous outcomes. Finally, we calculated numbers needed to treat to examine benefits of the ultrasonic device.

RESULTS

We identified 19 studies. Compared with the electrosurgical device, the ultrasonic device led to shorter operative time (MD, -14.86; 95% confidence interval (CI), -21.45 to -8.27; P < 0.00001), less blood loss (MD, -47.24; 95% CI, -79.57 to -14.90; P = 0.004), fewer gallbladder perforations (RR, 0.45; 95% CI, 0.35 to 0.57; P < 0.00001), shorter hospital stay (MD, -0.37; 95% CI, -0.61 to -0.14; P = 0.002), and fewer abdominal pains (MD, -0.95; 95% CI, -1.40 to -0.50; P < 0.0001). The trial sequential analysis demonstrated that the cumulative z-curve crossed the trial sequential monitoring and reached the required information size of the operative time. The numbers needed to treat to avoid one gallbladder perforation and postoperative nausea, respectively, were 7 and 15.

CONCLUSIONS

Compared with the electrosurgery device, the ultrasonic device could be superior with more clinical effectiveness. The trial sequential analysis demonstrated that further studies about the operative time were not needed.

Optimum cystic duct closure: a comparative study using metallic clips, ENSEAL, and ENDOLOOP in swine

BACKGROUND

Metal clips are commonly used to secure the cystic duct during cholecystectomy, although use of an ENDOLOOP (Ethicon Endo-Surgery, Blue Ash, OH) is often touted as a more secure closure when postoperative endoscopic retrograde cholangiopancreatography (ERCP) is anticipated. The objective of this study was to test the strength of 3 different cystic duct closure methods in a model simulating postoperative biliary insufflation.

METHODS

The extrahepatic biliary system, including common bile duct, gallbladder, and cystic duct, was harvested en bloc from 22 swine postmortem. A cholecystectomy was performed and the cystic duct was secured using 1 of 3 randomly assigned methods: metallic clips (Ethicon Endo-Surgery), an ENDOLOOP (Ethicon Endo-Surgery), or an ENSEAL tissue sealing device (Ethicon Endo-Surgery). The common bile duct was cannulated with a pressure-monitoring system and insufflated with air. The burst pressures, location of rupture, and size of the common bile duct and cystic duct were recorded and compared.

RESULTS

There were 7 pigs each in the ENDOLOOP and ENSEAL groups and 8 in the metallic clip group, with no statistical significance between cystic and common bile duct size. Mean burst pressure was 432 mm Hg for metallic clips, 371 mm Hg for the ENDOLOOP, and 238 mm Hg for the ENSEAL device (P = .02). Post hoc analysis revealed clips to be statistically superior when compared with the ENSEAL (P= .01). There was no statistical difference between the ENDOLOOP and metal clips or between the ENDOLOOP and the ENSEAL.

CONCLUSIONS

All 3 closure methods successfully secured the cystic duct, with mean burst pressures exceeding 195 mm Hg. Metallic clips demonstrated the highest burst pressures and no cystic duct stump leaks. This study challenges the traditional dogma of additionally securing the cystic duct with an ENDOLOOP when postoperative biliary instrumentation is expected and also suggests that an adequately secure closure may be obtained with thermal sealing devices.

Single-working-instrument, double-trocar, clipless cholecystectomy using harmonic scalpel: a feasible, safe, and less invasive technique

AIM

The aim of this study was to evaluate the safety and efficacy of the Harmonic scalpel (Ethicon Endo-Surgery, Cincinnati, OH) in the closure/division of the cystic duct and artery, and bladder dissection in laparoscopic cholecystectomy as a single working instrument, with the use of a two-working-trocar technique, compared with the regular laparoscopic clip/cautery, three-trocar technique.

METHODS

This prospective study included 160 patients with symptomatic gallstone disease who were randomly assigned for laparoscopic cholecystectomy by either Harmonic shear as a single working instrument, with the two-trocar technique (group 1 = 80 patients) or group 2 (regular clip/cautery, three-trocar technique) comprising 80 patients.

RESULTS

No significant complications were encountered in either group; however, 1 case in the regular laparoscopy group suffered mild leakage that was treated conservatively. Intraoperative bile spillage was insignificantly comparable in both groups (10 versus 13%; P = 0.46). The median operative time was statistically significantly shorter in the Harmonic group (20 versus 45 minutes; P = 0.0001). Also, hospital stay was significantly shorter in the Harmonic group (1 versus 1.5 days, respectively; P = 0.001), but no statistically significant difference was found in the incidence of postoperative complications. The overall cosmetic results and patient satisfaction was better in the Harmonic group.

CONCLUSIONS

The Harmonic shear is as safe and effective as the clip/cautery technique in laparoscopic cholecystectomy in achieving hemobiliary stasis, with shorter operative time, especially if used solely as a working instrument. The two-trocar technique is safe, feasible, and provides better cosmetic results and patient satisfaction.