DR. ALI MOHAMMAD MAHMUD M.S (GENERAL SURGEON)
Laparoscopic splenectomy (LS) provides health benefits to patients compared with open splenectomy (OS) in terms of perioperative morbidity, complications, and patient recuperation.
Prospective operative and outcome data of LS patients were compared with those of OS patients (historical controls).
Data were gathered, and patients were evaluated and treated at 2 McMaster University teaching hospitals in Hamilton, Ontario, and at the University of Kentucky Chandler Medical Center, Lexington, also a teaching hospital.
From January 1, 1994, through October 31, 1998, a total of 210 patients were studied. Of them, 147 patients from 3 university teaching hospitals underwent LS. These patients were matched with 63 OS patients according to age, sex, spleen weight, indication for splenectomy, and preoperative morbidity score.
A total of 147 patients evaluated for elective splenectomy underwent LS.
Main Outcome Measures:
Spleen weight, operative time, intraoperative blood loss, postoperative hospital stay, perioperative complications, and cost.
No significant difference in mean spleen weight was found between groups. Mean operative time was significantly longer for LS, but intraoperative blood loss was significantly lower. Mean postoperative hospital stay was significantly lower and perioperative complications significantly fewer for LS patients. Mean cost for LS with no complications was slightly lower than for OS.
Compared with OS, the lateral approach to LS takes longer to perform but results in reduced blood loss, shorter postoperative stay, and fewer complications. Mean weighted cost of LS is lower than OS at the study institutions. A prospective, randomized, controlled trial comparing these techniques is planned.
SINCE THE earliest reports of laparoscopic splenectomy (LS) in 1991 and 1992, 1-4 it has grown to become one of the most widely performed laparoscopic solid-organ procedures. It is not yet commonly performed because elective splenectomy remains a relatively infrequent operation. Moreover, LS remains an advanced technique and, like other solidorgan laparoscopic procedures, poses specific technical challenges to be mastered, such as management of intracorporeal bleeding and specimen extraction.5 Nevertheless, several authors5-10 have nowreported series of LSs, revealing the operation to be feasible and safe and demonstrating increasingly consistent results. Most of these authors report encouraging data with regard to perioperative morbidity, complications, and patient recuperation. The purpose of this study is to evaluate our ongoing experience with LS and to compare it with that of our OS patients. Splenectomy was most commonly performed in the OS and LS groups for idiopathic thrombocytopenic purpura. Other indications included lymphoma (Hodgkin and non-Hodgkin), autoimmune hemolytic anemia, hereditary spherocytosis, splenic cysts, Evans and Felty syndromes, and hypersplenism. Patients ranged in age from 2 to 83 years and were well matched in OS and LS groups with regard to age, sex distribution, and American Society of Anesthesiologists score Laparoscopic splenectomy was attempt tedin 147 patients and completed successfully in 143. Four patients (2.7%) were converted to laparotomy for completion of splenectomy. Three of these occurred in the first 20 patients of the study and were due to bleeding, and the fourth had extensive dense and vascular adhesions to the superior pole of his spleen that were not accessible via the laparoscope. One patient who underwent an uneventful and technically successful LS died. After surgery for hypersplenism, this patient—who had a history of deep vein thrombosis—was discharged from the hospital on postoperative day 2. Within 1 week, she returned to the hospital with worsening abdominal pain. An ultrasound scan revealed no intra-abdominal or left upper quadrant collection, and her hemoglobin and hematocrit values were well within normal limits. Further investigations revealed that she wasin a hypercoagulable state and that her inferior vena cava was thrombosed. The superior mesenteric vein also thrombosed, and despite intensive care and anticoagulation therapy, the patient died on postoperative day 18. Nine LS and 8 OS patients had undergone previous abdominal surgery. Also, 7 OS patients had separate procedures performed concomitantly with their splenectomies: staging laparotomy (n = 4), small bowel resection (n = 1), liver biopsy (n = 1), and cholecystectomy (n = 1).By comparison, 14 LS patients underwent concomitant laparoscopic procedures: cholecystectomy (n = 9), staging laparoscopy (n = 3), and distal pancreatectomy (n = 2). Twenty-two accessory spleens (15.0%) were identified and resected in the LS group, but only 3 were recorded in OS patients (4.8%). Spleen size ranged from 8.5 to 24.0 cm in greatest dimension in the OS group, and from 7.0 to 23.0 cm in the LS group. Perioperative data from both groups are summarized. There was no significant difference in mean spleen weight between groups. In the OS group, the resected spleen was simply weighed, but the weights recorded in the LS group were obtained from collected,
Patients and Methods
Background: In this study of laparoscopic splenectomy (LS), we evaluate prospectively gathered perioperative patient data and review lessons learned in the evolution of this procedure.
At 2 universities medical centers between November 1993 and March 2000, there were 203 patients (122 female patients and 81 male patients) who underwent LS after preoperative evaluation.
LS were successfully completed in 197 patients (97%). The mean operative time was 145.5 minutes and the length of stay averaged 2.7 days with 143 (70.4%) staying less than 48 hours. The most common indication was idiopathic thrombocytopenic purpura (ITP). Six patients required conversion to open splenectomy (OS), with only 2 conversions in the last 163 cases. No deaths were attributed to the procedure. Complications occurred in 19 patients (9.3%). Thirty accessory spleens were identified in 25 patients (12.3%). Seventeen patients (8.4%) underwent concomitant procedures, most commonly cholecystectomy.
LS by the lateral approach are both safe and feasible in patients of all ages. These patients were matched with LS patients according to age, sex, spleen weight, indication for splenectomy, and preoperative morbidity score. The American Society of Anesthesiologists score was used as a measure of preoperative comorbid factors. This study compares operative and perioperative data between OS and LS patients.
Although not consistently the practice in OS patients, all patients undergoing LS received polyvalent pneumococcal, meningococcal,and Haemophilus influenzae vaccines at least 1 week before surgery. To optimize perioperative coagulation status, each patient was individually evaluated for need for transfusion of blood products or platelets. Preoperative blood transfusions were ordered at the discretion of the referring hematologist. Patients who were given maintenance corticosteroid therapy before surgery were given parenteral corticosteroids through the perioperative period.Weattempted to obtain a preoperative ultrasound measurement of spleen size in the LS patients. Because their spleens were morcellated before extraction, postoperative specimen dimensions were not obtainable. Splenic dimensions in the OS group were obtained, when possible, from operative reports. Only 1 LS patient (with portal hypertension and hypersplenism) underwent preoperative splenicartery embolization.
Two of the authors (A.P. and M.M.) had experience with LS before this study. Those cases are not included in this study because some were performed at a separate center and, in several cases, a different operative technique (anterior approach) was used. All LSs in this series were performed using the lateral approach, a technique described by one of the authors (A.P.)10 and introduced to McMasterUniversity teaching hospitals in December 1993.The technique of the lateral approach to LS has been previously described in detail.11 The patient is placed in the right lateral decubitus position over a break in the operating table. The table is broken 20° to 30° below level in the cephalad and caudad portions . These maneuvers maximally open the space between the left costal margin and left iliac crest. Three or 4 trocars are used, generally two 5-mm (grasper and retractor), one 10-mm (camera),and one 11-mm (working and stapling port also used for extraction) trocar. Increasingly, we are using microlaparoscopic instrumentation, particularly in the pediatric population,in whom 2-mm (n = 2), 5-mm (n = 1), and 11-mm(n = 1) ports are used. Dissection is commenced by mobilizing the splenic flexure of the colon and dividing all colosplenic ligaments. Lateral splenic attachments (splenorenal and splenophrenic) are then divided. A cuff of peritoneum is left on the spleen. Retracting forceps are either used to grasp the peritoneal cuff and draw the spleen medially or are placed under the inferior pole of the spleen to simply elevate it so that the spleen is never grasped directly. The vessels of the splenic pedicle are then dissected and ligated in a cephalad progression. Increasingly wide use is made of ultrasonic dissection, particularly for division of the short gastric vessels. The main arteries and veins, once dissected free, are ligated by means of endoscopic stapling devices, clips, or suture ligatures. The tail of the pancreas is easily visualized and avoided using this approach. The small cuff of avascular superior pole splenophrenic attachment is temporarily left in place to facilitate introduction of the spleen into a durable nylon sac, wherein it is mechanically morcellated before extraction through the 10-mm trocar site the spleen, and any erring on the weights would have been toward underestimation.Mean operative time was significantly longer for LS vs OS (145.1 vs 77.3 minutes; P,.001). Mean intraoperative blood loss (derived from operative records) was significantly lower for LS vs OS (162.3 mL vs 380.8 mL; P = .002). A significant difference in mean postoperative hospital stay was also seen for the LS vs OS groups (2.4 vs 9.2 days; P,.001).Further analysis of the data revealed that older ($65 years) and younger (,65 years) LS patients had shorter postoperative hospital stays than their OS counterparts. Although the mean postoperative hospital stay for older LS patients (3.7 days) was slightly longer than for younger LS patients (2.2 days), the difference between OS and LS patient hospital stay was even more pronounced in older patients. Mean operative times were shorter for OS than for LS patients for normal-sized (#180 g) and large (.180 g) spleens. The difference in operative times between the OS and LS groups was more evident in patients with large spleens. Operative blood loss was significantly greater in OS than in LS patients for both large and normal-sized spleens. The largest difference in blood loss between LS and OS patients was seen in patients with large spleens.
The purpose of this study was to analyze the published perioperative results of laparoscopic splenectomy (LS) compared to open splenectomy (OS), and to determine the impact of LS on the incidence and type of splenectomy-related complications.
Perioperative results and complications were tabulated from all English-language reports of LS from 1991 through 2002, and complications were analyzed further by type. Data were taken from 26 series that compared OS to LS within an institution (paired analysis) and from an additional 25 series of only LS (unpaired analysis), and a meta-analysis was performed.
A total of 2940 patients from 51 published series were included (LS, 2119 patients; OS, 821 patients). Age, gender, and American Society of Anesthesiologists class were similar. In the analysis of paired OS and LS studies, the mean operative time for LS was significantly longer (LS, 180 minutes; OS, 114 minutes; P<.0001,) but the postoperative hospital stay was shorter (LS, 3.6 days; OS, 7.2 days; P<.001). Accessory spleens were identified in 11% of cases in both groups. The total complication rate for LS was 15.5%, compared with 26.6% for OS (P<.0001). LS was associated with significantly fewer pulmonary, wound, and infectious complications (P<.001 for all) but with more hemorrhagic complications, when conversions for bleeding were included. Mortality rates for LS and OS were similar (OS, 1.1%; LS, 0.6%; P=not significant). Comparable results were obtained when the unpaired LS series were added to the analysis.
Although operative times are longer for LS than OS, LS is associated with a significant reduction in splenectomy-related morbidity, primarily as a function of fewer pulmonary, wound, and infectious complications. Surgery. 2000 Oct; 128(4):660-7.There was a significantly lower rate of perioperative complications in the LS group (15 [10.2%] of 147 patients) than in the OS group (22 [34.9%] of 63 patients) ( P = .04). Complications within the LS group included intraoperative bleeding in 4 patients (resulting in conversion to laparotomy) and postoperative bleeding in 1 patient who, although hemodynamically stable, demonstrated a decreasing hematocrit value. This patient underwent a successful second laparoscopy during which a bleeding vein was ligated, thus achieving hemostasis. Two LS patients developed a deep venous thrombosis, and 1 had a pulmonary embolus. Two patients in this group also revealed left pneumothoraces after surgery: 1 had a chest tube inserted for 2 days and otherwise recovered well, and the other required no chest tube insertion. Other complications included pneumonia and pleural effusion in 1 patient converted to laparotomy and 1 case of urinary retention. Of patients who underwent successful.LS, there were no cases of intra-abdominal or subphrenic abscesses. Six patients in the LS group required blood transfusions. Complications in the OS group included postoperative bleeding, wound and subphrenic abscesses, pneumonia, cardiac arrhythmias, and urinary retention. All of the conversions and 5 (83%) of the blood transfusions in the LS group occurred in the first 40 patients.
The greatest advantages to a laparoscopic approach are seen in operations in which the major morbidity is related to the incisions by which the target structure is accessed and removed. Consider laparoscopic cholecystectomy: it is the same procedure—including, for the most part, the sequence of dissection—as open cholecystectomy. The ostensible difference between laparoscopic and open cholecystectomy is related to the incision(s) used to complete the operation. The dramatic impact of this most common laparoscopic procedure needs no elaboration, having evolved to outpatient surgery in many centers. The concept of LS has similar theoretical appeal. After LS, the patient simply has to recover from the incisions; there is no anastomosis to heal or other altered physiological effects. Anticipation of an improved postoperative recovery led to LS being performed as one of the earliest laparoscopic solid-organ procedures. Several early descriptions of LS1-4 and case series5, 910, and 13 seemed to confirm these early optimistic projections. Comparative studies6-8, 14 of LS vs OS are now emerging, and they offer a clearer picture of the advantages and disadvantages of each. This is the largest such study reported to date, to our knowledge. Certain flaws inherent in the design of a nonrandomized, prospective study such as this preclude the making of emphatic statements regarding differences in outcomes between groups. Patients in the OS group underwent surgery and postoperative care several years before many patients in the LS group. Although unlikely to be major, there may exist differences in aspects of postoperative care between these groups. Otherwise, on analysis, the LS and OS patients seem to represent fairly well-matched cohorts with regard to personal demographics, spleen size, indications for surgery, and preoperative morbidity. Perhaps the most obvious advantage of LS vs OS in this study is the markedly reduced postoperative hospital.
(n = 147)
(n = 63)
Male 62 28
Female 85 35
Age, mean (range), y 38.3 (2.0-82.0) 42.5 (8.0-83.0)
Score, mean (range)
1.8 (1.0-4.0) 1.9 (1.0-4.0)
In fact, our current experience is that most patients undergoing LS alone are discharged from the hospital 1 to 2 days after surgery .This finding was maintained across the spectrum of patient ages represented in this study. The greatest advantage was seen in patients older than 65 years, suggesting that the attenuated catabolic response seen in laparoscopy vs laparotomy6 may be particularly significant in this patient group Despite successful ascension of the learning curve for LS, it still takes longer to perform than OS, which reflects several factors that bear consideration. Laparoscopic splenectomy requires more time to position the patient and establish pneumoperitoneum. The process of laparoscopically placing the resected spleen into a sac, morcellating it and extracting it via a trocarsite takes more time than simply removing the spleen at laparotomy. Although improved systems of specimen recovery and extraction in minimally invasive surgery are anticipated, at present it must be accepted that these aspects of the operation will remain relatively more timeconsuming than in open surgery. Early in our LS experience, 1 patient developed a deep vein thrombosis and another pulmonary embolus after surgery. We postulated that lateral decubitus positioning and added operative time may contribute to venous stasis.
All patients now receive perioperative deep vein thrombosis prophylaxis. With the exception of the 1 patient who underwent successful LS only to develop a lethal hypercoagulable state and portal vein thrombosis after surgery, there have been no further cases of postoperative venous thrombosis. This complication has also been reported15 after elective OS.Anotable difference in comparing the postoperative complications between the LS and OS groups is the absence of pneumonia, wound infection, and subphrenic abscess in the LS group. The avoidance of such major morbidity in the LS group may be explained by results of studies12, 16-21 that suggest that the immune function is less suppressed after laparoscopy than after laparotomy. Laparoscopic splenectomy was completed successfully in 143 (97.3%) of 147 patients in this consecutive 200
Spleen Weight, g
Operative Time, min
Complications of Splenectomy in 210 Patients*
During surgery 4 0
After surgery 1 5
Wound 0 1
Abscess 0 1
Pulmonary embolus 1 1
Pneumonia 1 5
Effusion/atelectasis 1 3
Pneumothorax 2 0
Deep vein thrombosis 2 0
Cardiac 0 2
Genitourinary 1 3
Bowel 0 1
Other 2 0
Total 15 (10.2) 22 (34.9)
*Data are given as number (percentage).
Patient Age, y
Hospital Stay, d
Difference in length of postoperative hospital stay by age between
patients who underwent open and laparoscopic splenectomy.
The relatively low conversion rate (2.7%) may partly reflect the main indications for which LS were performed. This is a direct consequence of referral pattens within our centers. Most of our patients underwent LS for benign (136 of 147) rather than malignant (11 of 147) disease, and although mean spleen weight (264.5 g) was well above the upper limits of normal, we did not have to contend with any massive spleens (.30 cm). Three conversions were caused by difficulties encountered in controlling bleeding laparoscopically. With experience, bleeding can be avoided, or at least temporized, with judiciously placed grasping forceps, facilitating either a laparoscopic recovery of hemostasis or, if necessary, a controlled conversion to laparotomy. It is our practice to have a basic laparotomy tray opened and set up with every LS. The fourth patient who underwent conversion had a large spleen, perisplenitis, and dense vascular superior pole attachments that were not accessible via laparoscopy. This case illustrated a major challenge of advanced laparoscopy: the anatomic site of interest can be well visualized, but the surgeon is currently limited by laparoscopic instrumentation possessing limited degrees of freedom. By comparison, in open surgery a surgeon is able to profit from the combined flexibilities of a wrist and elbow and is afforded many more degrees of movement. The technique of the lateral approach to LS has evolved through the period of this study. Initially, four 11-mm trocars were used. It is now routine to use only 1 or at most two 10- or 11-mm trocars; the other ports are 2 or 5 mm in size. This has provided an improved cosmetic result, but has been more difficult to demonstrate improved functional recovery. Much wider use is now made of ultrasonic dissection, allowing a more expedient division of the short gastric vessels. Moreover, the use of ultrasonic dissection caudad to the splenic hilum has resulted in the application of fewer hemostatic clips, which can impair the subsequent placement of an endovascular stapling device on splenic hilar structures. Great care is taken to avoid any direct grasping or manipulation of the spleen, which greatly reduces the risk of bleeding and parenchymal injury, identified by Gigot et al21 as 1 of 2 factors (as well as extended operative time) for splenosis after LS. An often mentioned criticism of LS is the potential for missing accessory spleens.6, 8, 22 In one study, 8 an accessory spleen along the greater curve of the stomach was identified on a preoperative computed tomographic scan but could not be detected laparoscopically. During subsequent laparotomy, the accessory spleen was apparently easily palpated and resected.8 In this series, 22 accessory spleens (15%) were detected and removed laparoscopically, which is consistent with a published incidence5,6 of 10% to 20% in patients undergoing splenectomy for hematologic disease. It is unclear why such a low incidence of accessory spleens (4.8%) was noted in the OS group. Using the lateral approach to LS, most but not all of the most common sites for accessory spleens can be inspected. These locations, in descending order of frequency, are the splenic hilum and vascular pedicle, gastrocolic ligament, pancreatic tail, greater omentum, greater curve of the stomach, splenocolic ligament, small and large bowel mesentery, left broad ligament in women, and left spermatic cord in men.21 It is our practice to routinely examine, laparoscopically, the anatomic areas listed previously—except the mesenteries and deep pelvic structures because of technical limitations—before commencing the splenectomy. Although it is possible that some accessory spleens were missed in LS patients by not searching the distant sites, there is little support for the routine use of preoperative screening techniques such as denatured red blood cell scintigraphy to detect the more remote accessory spleens.16 To date, there has been only 1 patient in our LS group with recurrent idiopathic thrombocytopenic purpura, most likely on the basis of a missed accessory spleen or splenosis, as demonstrated by scintigraphy after LS. Concern has also been raised23 about laparoscopically retrieving an adequate tissue sample for pathological examination. We found that, once the spleen is morcellated (in a durable sac) and the splenic capsule is disrupted, it is possible to extract intact large portions of spleen through a dilated 10-mm trocar incision. It has been possible for our pathologists to comment on splenic histological features as well as tissue architecture from these specimens. Although some authors19 suggest restricting the indications for LS, most5, 10,12,18,24 advocate a more widespread role for LS in treating hematologic diseases in adults and children. Some authors19 have even tentatively proposed the use of laparoscopy in splenic trauma, and LS may play a role in treatment of the blastic phase of chronic myelogenous leukemia.25 We have witnessed increased patient interest in LS and diminished reluctance to proceed with the surgery compared with those previously considering OS. This partly accounts for the relatively large number of patients who have undergone LS in our centers during the past few years. In conclusion, the lateral approach to LS affords clear visualization of the splenic hilum. Easy access to splenic hilar structures diminishes the risk of injury to the spleen or tail of the pancreas. Compared with OS, the lateral approach to LS takes longer to perform but results in reduced blood loss, shorter postoperative hospital stays, and fewer complications. Mean weighted cost of LS is lower than that of OS at our institutions. A prospective, randomized, controlled trial comparing these techniques is planned.
- Delaitre B, Maignien B. Laparoscopic splenectomy: one case [letter]. Presse Med. 1991; 44:2263.
- Delaitre B, Maignien B, Icard P. Laparoscopic splenectomy [letter]. Br J Surg. 1992; 79:1334.
- Caroll BJ, Phillips EH, Semel CJ, et al. Laparoscopic splenectomy. Surg Endosc. 1992; 6:183- 185.
- Hashizume M, Sugimachi K, Ueno K. Laparoscopic splenectomy with an ultrasonic dissector [letter]. N Engl J Med. 1992; 327:438.
- Glasgow RE, Yee LF, Mulvihill SJ. Laparoscopic splenectomy: the emerging standard.
- Brunt LM, Langer JC, Quasebarth MA. Comparative analysis of laparoscopic versus open splenectomy. Am J Surg. 1996; 172:596-601.
- Hashizume M, Ohta M, Kishihara F, et al. Laparoscopic splenectomy for idiopathic thrombocytopenic purpura: comparison of laparoscopic surgery and conventional open surgery. surgery. Surg Laparosc Endosc. 1996; 6; 129-135.
- Watson DI, Coventry BJ, Chin T, Gill PG, Malycha P. Laparoscopic versus open splenectomy for immune thrombocytopenic purpura. Surgery. 1997; 121:18-22.
- Flowers JL, Lefor AT, Steers J, et al. Laparoscopic splenectomy in patients with hematologic diseases. Ann Surg. 1996; 224:19-28.
- Park A, Gagner M, Pomp A. Laparoscopic splenectomy: superiority of the lateral approach. Abstract presented at: Annual Meeting of the Royal College of Physicians and Surgeons of Canada; September 8, 1993; Vancouver, British Columbia.
- Park A, Gagner M, Pomp A. The lateral approach to laparoscopic splenectomy. Am J Surg. 1997; 173:126-130.
- Poulin EC, Thibault C, Mamazza J. Laparoscopic splenectomy. Surg Endosc. 1995; 9:172- 177.
- Gigot J-F, deGoyet JD, Van Beers BE, et al. Laparoscopic splenectomy in adults and children: experience with 31 patients. Surgery. 1996; 119:384-389.
- Friedman RL, Fallas MJ, Carroll BJ, et al. Laparoscopic splenectomy for ITP: the gold standard. Surg Endosc. 1996; 10:991-994.
- Rattner DW, Ellamn L, Warshaw AL. Portal vein thrombosis after elective splenectomy. Arch Surg. 1993; 128:565-570.
- Bessler M, Whelan RL, Halverson A, et al. Is immune function better preserved after laparoscopic versus open colon resection? Surg Endosc. 1994; 8:881-883.
- Trokel MJ, Bessler M, Treat MR, et al. Preservation of immune response after laparoscopy. Surg Endosc. 1994; 8:1385-1388.
- Reynold M, Klar E, Trachtenber L, Vitale G. Peritoneal host defenses are less impaired by laparoscopic than by open operation. Surg Endosc. 1994; 8:240.
- Pons MJ, Targarona EM, Balague C, et al. Laparoscopic cholecystectomy induces an attenuated metabolic response to surgical injury: a comparative study with open cholecystectomy. Surg Endosc. 1994; 8:263.
- Glerup H, Heindorff H, Flyvbjerg A, et al. Elective laparoscopic cholecystectomy nearly abolishes the postoperative hepatic catabolic stress response. Ann Surg. 1995; 221:214-219.
- Gigot J-F, Jamar F, Ferrant A, et al. Inadequate detection of accessory spleens and splenosis with laparoscopic splenectomy: a shortcoming of the laparoscopic approach in hematologic diseases. Surg Endosc. 1998; 12:101-106.
- Gigot J-F, Lengele B, Gianello P, et al. Present status of laparoscopic splenectomy for hematologic diseases: certitudes and unresolved issues. Semin Laparosc Surg. 1998; 5:147- 167.
- Lobe TE, Schropp KP, Joyner R, et al. The suitability of automatic tissue morcellation for the endoscopic removal of large specimens in pediatric surgery. J Pediatr Surg. 1998; 29:232- 234.
- Katkhouda N, Hurwitz MB, Rivera RT, et al. Laparoscopic splenectomy: outcome and efficacy in 103 consecutive patients. Ann Surg. 1998; 228:568- 578.
- Ueo H, Honda M, Adachi M, et al. Minimal increase in serum interleukin-6 levels during laparoscopic cholecystectomy. Am J Surg. 1994; 168:358-360. ARCH SURG/VOL 134, NOV 1999 WWW.ARCHSURG.COM 1269
- Am J Surg. 1996 Nov;172(5):596-9; discussion 599-601