Phuchungla
Prediction of difficult laparoscopic cholecystectomy while working up the patient for surgery

Kumar N1, Bhutia P2, Singh V. K3, Kharga B4, Sharma B. K5, Jain N6

1Dr. Kumar Nishant, Associate Professor, 2Dr. Phuchungla Bhutia, Assistant Professor, 3Dr. Varun Kumar Singh, Associate Professor, 4Dr. Bikram Kharga, Professor, All these authors are affiliated with Department of Surgery, Sikkim Manipal Institute of Medical Sciences, Gangtok, 5Dr. Barun Kumar Sharma, Associate Professor, Department of Radiodiagnosis, North East Indira Gandhi Regional Institute of Health and Medical Sciences, Shillong, 6Dr. Nitin Jain, Senior Resident, Department of Paediatric Surgery, Maulana Azad Medical College, Delhi, India.

Address for Correspondence: Dr. Phuchungla Bhutia, E-Mail Id: david999ran@gmail.com



Abstract

Introduction: Laparoscopic cholecystectomy [LC] has established itself as standard of care for gallstone disease. With the wide availability of expertise, complication rate and conversion rate both are coming down. Coupled with increase in patient awareness and easy accessibility of information, it is becoming increasingly difficult for surgical team to explain complication arising following surgery. A preoperative prediction can help ease doctor-patient relationship. Objective: To find out the predictors of difficult laparoscopic cholecystectomy while investigating the patient for surgery. Patient and methods: We selected 125 patients based on convenient sampling who underwent LC. A Likert type questionnaire was used to assess the difficulty. Weighted difficulty score [WDS] was calculated as the sum of product of parameter response and difficulty response score [WDS= ∑ (PR x DRS)]. Mean WDS was then compared against preoperative investigation findings. Results: Mean WDS was found to increase with raised leukocyte count as well as with altered liver function tests. Thickened gallbladder wall in ultrasonography had a positive correlation with difficulty in surgery but no association was found with the pericholecystic fluid. A larger size of stone, stone impacted at neck and a larger size of the impacted stone were all had a significant positive association with difficult LC but number of stones in GB had no impact on difficulty during surgery in our study. Altered liver echotexture and a contracted GB were the other factors which can predict a possible difficulty during LC. Conclusion: A careful watch on investigation which include leukocyte count, liver function tests and preoperative ultrasonography can help predict the difficulty, a possibility of conversion as well as complications. A discussion of these events with the patients and their relatives can create an atmosphere of mutual trust and better prepare to overcome of untoward events.

Key words- Cholecystectomy, Difficult, Laparoscopic, Weighted Difficulty Score



Manuscript Received: 18th October 2017, Reviewed: 28th October 2017
Author Corrected: 4th November 2017, Accepted for Publication: 10th November 2017

Introduction

Laparoscopic cholecystectomy [LC] has established itself as the standard of care for symptomatic gallstone disease [1].With the wide availability of expertise, the complication rate and conversion rate both are coming down. Coupled with the increase in the patient awareness and easy accessibility of information, it is becoming increasingly difficult for the surgical team to explain patients and their relatives to accept the complications that can arise following surgery. In the era of litigation, these untoward events may have significant consequences for everyone involved in the patient care. Because of high volume of cases, these consequences are increased several folds. On one hand, high volume of cases can enhance the surgical skills of the beginners, on the other hand can induce a tendency to take the surgery casually thus creating surprises in difficult cases. Anatomical variations in hepatobiliary system are common and can be present in about 30% of the population [2]. Any injury to them can cause significant morbidity bringing bad name to surgical team. And even if morbidityis avoided, a lot of already planned time is lost. The study was planned to know whether or not a difficult laparoscopic surgery could be predicted in order to help the patients develop a better understanding of “the things can go wrong even in best of hands and safest of procedures” and thus ease the doctor-patient relationship.

Objective

To identify risk factors during investigating and preparing the patient for surgery, responsible for technically difficult laparoscopic cholecystectomy.

Methods

Study design- The study was conceived as a prospective analytical study. Patients were selected using convenient sampling method.

Setting- The study was conducted in Central Referral Hospital associated to Sikkim Manipal Institute of Medical Sciences, Gangtok from August 2012 to July 2013.

Inclusion and exclusion criteria- A total of 125 patients were included who fulfilled the inclusion criteria. The inclusion and exclusion criteria have been listed in table/figure1.

Table 1: Inclusion and exclusion criteria

Inclusion Criteria

Exclusion Criteria

1. Symptomatic gallstone disease

2. Asymptomatic gallstone disease with following

a.  Size of calculus <3 mm or >3 cm

b. Associated polyp

c.  Life expectancy >20 years

d. Associated diabetes mellitus

1. Equipment or other technical failure,

2. Complicated cholelithiasis [pancreatitis, choledocholithiasis]

3. Co-morbidities other than hypertension or diabetes mellitus

4. Surgeon’s experience of <30 cases/ 1 year

5. Reduced port surgeries


Outcome variable- Difficult LC was the outcome variable. To assess the difficulty, we sent a Likert type questionnaire to practising laparoscopic surgeons across the country using Google© Forms© [table/figure3] and then calculated a weighted difficulty score [WDS= ∑ (PR x DRS)]. PR was the parameter response recorded as one or zero for its presence or absence, respectively and DRS was the difficulty response score measured on a scale from 1 to 5. Mean WDS was then compared against preoperative investigations.

Procedure standardization- The operative protocol was standardized. We have total 8 surgeons in the department who perform laparoscopic surgeries but cases of 5 surgeons were counted as only they had sufficient experience as laid by the exclusion criteria. Only those cases were included which were performed using 4 standard ports [two 10 mm, two 5mm]. Pneumoperitoneum was created using CO2 gas creating a pressure of 12 mmHg. Cystic duct was clipped and cut in standard manner. Cystic artery was not clipped but dealt with energy sources. A retrieval bag was used to bring the GB out.

Analysis- Data was tabulated and analysed using Microsoft© Excel© 2013 and IBM© SPSS© 21.

Observations

The number of cholecystectomies are gradually increasing and over last 2-3 years and have risen from around 250 to more than 400 this year in our institute. Based on convenient sampling method, 125 consecutive patients were selected for their inclusion in to the study. To reduce the inclusion bias, the sample group [125 patients] was matched for age and sex to study population group [total number of patients who underwent LC]. The female to male ratio was 2.94 and 2.90 [p>0.05] in the study population and sample group respectively. Mean age [in years] of female patients was 39.1 and 38.96 [p>0.05] while that of male patients was 43.3 and 41.91 [p>0.05] for study population and sample group respectively.

Mean leukocyte count of the patients in sample group was 7802.8/cumm and 16% of them had leucocytosis. Average total and conjugated bilirubin was 0.88 and 0.46 mg/dl, respectively. Mean AST was 60.3 U/l and ALT was 9oo54.9 U/l. Average alkaline phosphatase level was 132.2 U/l and the value of GGT was 54.3 U/l [table 2].

Table 2: Preoperative variables: biochemistry and imaging

Variable/ Parameter

Overall

Female

Male

Total Leukocyte Count [per cumm, mean]*

7802

7894

7537

Liver Function Test

Total Bilirubin [mg/dl, mean]

0.88

0.89

0.86

Conjugated Bilirubin [mg/dl, mean]

0.46

0.49

0.36

AST [U/l, mean]

60.3

58.2

66.5

ALT [U/l, mean]

54.9

52.03

63.3

ALP [U/l, mean]

132.2

127.6

145.7

GGT [U/l, mean]

54.3

52.4

59.8

Imaging [Ultrasound]

GB wall [mm, mean]

3.6

3.7

3.4

Contracted GB [n]

6 [4.8%]

5

1

Pericholecystic fluid [n]

6 [4.8%]

5

1

Solitary calculus [n]

2

1

1

Largest stone [mm, mean]

12.6

12.3

13.5

Impacted stone in neck or infundibulum [n]

39 [31.2%]

25

14

Size of impacted stone [mm, mean]

3.6

3.02

5.3

GB polyp [n]

3

1

2

Altered liver echotexture [n]

27 [21.6]

24

3

*16% patients had count of >11,000.


On ultrasonography, average thickness of gallbladder wall was 3.6 mm. GB was contracted in 6 [4.8%] patients. Pericholecystic fluid was present in only 6 [4.8%] patients. In 39 [31.2%] patients, stone was impacted in the neck of gallbladder. Two [1.6%] patients had solitary calculus and 3 [2.4%] patients had polyp. The average size of the largest stone was 12.6 mm while the size of the stone impacted at infundibulum was 3.6 mm. Liver echotexture was increased in 27 [21.6%] patients and coarsened in 98 [78.4%] patients [table/figure 2].

An average of 144.7 litres of gas was used per case during the study. Harmonic© scalpel [84.8%] and bipolar Maryland [53.6%] were the energy source used during the study.The ease and the difficulty of surgery was graded on a scale of 1 to 5 by the practising laparoscopic surgeons across the country who responded to the questionnaire sent to them using Google© Forms©. A weighted difficulty score was calculated after the responses obtained from them [table/figure 3].

Table/Figure-3: Parameter Response and Difficulty Response Score
 
figure01

During surgery, we found the gallbladder contracted in 7 [5.6%] patients. Cystic duct and CBD were not seen initially in 7 [5.6%] and 5 [4%] patients respectively. Omental adhesions to GB and Calot’s were most common followed by other adhesions [table/figure4]. The angle between cystic duct and common hepatic duct was narrow in 4 [3.2%] patients and Calot’s tringle was frozen in 13 [10.4%] patients. Multiple or aberrant vessels were present in cystohepatic triangle in 4 [3.2%] patients. Peritoneal contamination was high as stone and bile spillage was present in 56 [44.8%] and 15 [12%] patients respectively. Main cystic artery was safely clipped in all cases but minor bleeding was present due to minor vessels in 55 [44%] cases. There was one patient who suffered CBD injury which was recognized on table and dealt with. We encountered frozen cystic plate in 8 [6.4%] patients leading to difficult removal. GB bed bleeding was there in 21 [16.8%] patients. Conversion rate was 6.4% [8 patients]. Mean duration of surgery was 100.56 minutes.

Table 4: Intraoperative findings – adhesions

Intraoperative adhesions

Overall

Female

Male

Omental adhesions to

1. Gallbladder

92 [73.6%]

66

26

2. Calot’s triangle

22 [17.6%]

13

9

3. Anterior abdominal wall/ falciform ligament

13 [10.4%]

12

1

Other adhesions between

1. GB and anterior abdominal wall

9 [7.2%]

5

4

2. GB and bowel

17 [13.6%]

13

4

3. Bowel and Calot’s triangle

1 [0.8%]

1

0

4. Liver and anterior abdominal wall or diaphragm

28 [22.4%]

20

8

5. Bowel and anterior abdominal wall

1 [0.8%]

0

1


Mean WDS was found to increase with rising total leukocyte count (Pearson’s correlation coefficient=0.348) and this positive correlation was statistically significant. (p=6.825×10-5). Mean WDS increased with rising total bilirubin (Pearson’s correlation coefficient=0.443, p=2.163×10-7) but was not found to be significantly changed with conjugated bilirubin level (Pearson’s correlation coefficient=0.108, p=0.231). The liver enzymes AST [Pearson’s correlation coefficient=0.572, p=2.973×10-12] and ALT [Pearson’s correlation coefficient=0.658, p=6.230×10-17] had a significant positive correlation with the WDS. Similarly, other liver enzymes including ALP [Pearson’s correlation coefficient=0.508, p=1.382×10-9] and GGT [Pearson’s correlation coefficient=0.586, p=6.303×10-13] too had a positive correlation that was statistically significant [table/figure 5, 6].

Table/Figure-5: Correlation coefficients of preoperative investigations
 
figure02

Mean WDS increased significantly with wall thickness of gall bladder on ultrasonography (Pearson’s correlation coefficient=0.623, p=7.945×10-15). Mean WDS was not found to be significantly changed with presence or absence of pericholecystic fluid on ultrasonography. It was 19.7 in patients with and 13.8 in patients without pericholecystic fluid (p=0.224). Mean WDS increased in patients with impacted stone on ultrasonography [21.8 in patients with and 10.6 in patients without impacted stone] and the difference was significant (p=1.49 ×10-7). Mean WDS was also found to increase significantly with the size of impacted stone at infundibulum [r=0.250, p=0.005] as well as with the size of largest stone in GB (r= 0.542, p=6.162×10-11). Altered liver echotexture too was found to significantly affect WDS with a mean value of 21.01 compared to those with normal liver echotexture with a mean WDS of 12.2 [p=0.00033]. A contracted GB posed more difficulty during surgery compared to normally distended GB [WDS=39.7 and 12.6, respectively, p=5.94×10-11). The number of calculi hadn’t been found to have any relation to WDS [14.39 in patients with multiple calculi and 8.98 in patients with solitary calculus, p=0.515] [table/figure 5, 6].

Table 6: Significance of correlation of various clinical parameters in predicting difficult laparoscopic cholecystectomy [in descending order]

P value

Parameter

Statistical association

Pearson correlation coefficient (r)

Data

6.230×10-17

ALT

Significant

0.658

Continuous

7.945×10-15

Increased wall thickness

Significant

0.623

Continuous

6.304×10-13

GGT

Significant

0.586

Continuous

2.973×10-12

AST

Significant

0.572

Continuous

5.94 ×10-11

Contracted gall bladder

Significant

 

Nominal

6.162×10-11

Size of largest stone

Significant

0.542

Continuous

1.382×10-9

ALP

Significant

0.508

Continuous

1.49 ×10-7

Stone impacted at infundibulum

Significant

 

Nominal

2.163×10-7

Total bilirubin level

Significant

0.444

Continuous

6.825×10-5

Total leukocyte count

Significant

0.348

Continuous

0.00033

Liver echotexture

Significant

 

Nominal

0.005

Size of impacted stone at infundibulum

Significant

0.249

Continuous

0.515

Solitary or multiple calculi#

Insignificant

 

Nominal

0.231

Conjugated bilirubin

Insignificant

0.108

Continuous

0.224

Presence of pericholecystic fluid

Insignificant

 

Nominal

#Three cases of GB polyp are excluded.


Discussion

If we look at the disease burden in the state and then compare it to available literature, we find hardly few articles around. This isafter the hospital statistics show cholecystectomies constitute almost 70% of all surgical procedures[3,4].Patient profile here is typical of any hilly area in the country where people get adjusted to a higher threshold of tolerance to pain either due to socio-cultural practices or mainly due to poor outreach of health services. And therefore a “difficult gallbladder” is not uncommon to find during LC.

We found leucocytosis in acute phase of the disease is associated with difficult surgery. Leucocytosis may be a reflection of extent of involvement of pericholecystic tissue which can cause difficulty during surgery even in the elective setting. Similar findings have been reported by various other authors where they have found the incidence of leucocytosis almost similar to that in our study [16-18%], Kumar found it to be less than 10% while in Yetkin’s study it was 56.17%, however, all of them found it to be risk factor for difficult surgery[5-8].Elevated bilirubin in cholecystitis is not a common finding when we see the literature as is the case in present study [4%] but various studies including us have reported that raised bilirubin levels are associated with difficulty during surgery and resultant more chances of conversion[7, 9, 10].We found an independent positive correlation of increase in liver enzymes viz aspartate aminotransferase, alanine aminotransferase, alkaline phosphatase and γ-glutamyl transpeptidase with difficulty in LC. Vivek, Alponat and Kama mentioned in their research that chances of adhesiolysis are increased and Calot’s triangle dissection becomes difficult if there is a history of liver dysfunction [9, 11, 12].

It was concluded from our study that difficulty arises during the course of surgery if wall thickness is increased in pre-operative ultrasonography. GB wall thickness has been identified as a risk factor for conversion. The critical thickness of GB wall associated with conversion varies from study to study. It was 3mm to 6mm in different studies. In a study conducted by S. Kumar it was 4mm. The same has been confirmed by other researchers like Lal, Nachnani and Baki who considered GB wall thickness to be the most important sonographic risk factor of conversion to open cholecystectomy[5,13-15]. We didn’t find significant correlation between the presence of Pericholecystic fluid on pre-operative ultrasonography and difficult course of surgery. Surprisingly we had the least number of patients who had been shown to have pericholecystic fluid in abdominal sonography [4.8%]. The proportion is varied ranging from 8% to 37% in various other articles. In contrast to our study, the other studies had shown the presence of pericholecystic fluid as a risk factor for conversion to open procedure [6, 7, 14, 16]. Level of operative difficulty was found to increase with the finding of contracted GB on ultrasonography in our study. The finding was not universally supported in literature as Kumar, Nachnani and Vivek found evidence in favour of it while Baki suggested that course of surgery was not related to the shape of the gallbladder [5, 9, 14, 15].

Altered liver echotexture was a predictor of difficult LC in our study. Though literature is silent over this particular finding of ‘altered liver echotexture’, there are series which have reported that patients with cirrhosis took longer time and had more conversions as well as raised incidences of postoperative complications. Altered liver echotexture may be an indication of liver pathology especially cirrhosis or pre-cirrhotic changes that can pose difficulty during surgery [17-19]. Presence of stone itself causes difficulty at times. We found that surgery becomes difficult in cases having the stone impacted in neck or infundibulum as there will be difficulty in grasping the gall bladder due to over distension and the level of difficulty increases with size of impacted stone at infundibulum. Operative time was found to increase with the presence of a large stone even in absence of impaction at neck. Jansen found a stone size of >20 mm if impacted at Hartmann’s pouch made the dissection difficult [20]. Lal and Kumar too find a similar association of impacted stone with increasing difficulty in surgery [5,13]. Kumar and other authors also found that operative difficulty had an association with the increased size of stone but few other like Kama and Fried could not establish this association [5, 12, 21]. Most controversial of all is the number of stones. In our study, number of stones whether single or multiple couldn’t find an association with difficult surgery. Nachnani too in his series didn’t find any association between number of stones and risk of conversion however Vivek found multiple stones were associated with difficult Calot’s triangle dissection as well as gallbladder extraction [9, 14].On the other hand Kumar noticed that a single stone had more chances of conversion. Baki too supported him with his finding of association of single large stone with longer operative time [15].

Conclusion

As the field of surgery is evolving, the minimum invasive surgery is becoming the undisputed leader at least in the elective setup. And laparoscopic cholecystectomy is the gate way to it. With time, LC has become safer, the procedure is standardized, steps are defined and therefore is serving as a research tool for advanced minimum invasive surgery like reduced port surgeries, single incision laparoscopic surgeries, natural orifice transluminal endoscopic surgery and much more. The importance of preoperative prediction of a possible difficulty lies with the fact that the LC is now regarded as a very basic procedure among the people, for three reasons: for its volume, increasing awareness and availability of information. LC in present scenario is slowly converting towards day care surgery and with it the mindset of people considering it as a minor procedure and not understanding the complications associated with it.In the era of increasing litigation, the present study can help the professionals in explaining and informing the patient about possible complicationsthat can happen during difficult surgery and inform beforehand the cases who are likely to have a difficult surgery.

Contribution- KN, PB, VKS, BK and NJ were the operative surgeons. BKS was associated with the imaging work up. Data collection and tabulation was done by PB, BK and NJ. Statistical analysis was mainly handled by KN and VKS. All the authors were actively involved in the manuscript writing.

Funding: Nil, Conflict of interest: None initiated
Permission from IRB: Yes

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How to cite this article?

Kumar N, Bhutia P, Singh V.K, Kharga B, Sharma B.K, Jain N. Prediction of difficult laparoscopic cholecystectomy while working up the patient for surgery. Surgical Update: Int J surg Orthopedics. 2017;3(4): 107-113.doi:10.17511/ijoso.2017.i4.03.


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