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Print version ISSN 0034-7094
Rev. Bras. Anestesiol. vol.60 no.3 Campinas May/June 2010
Luiz Eduardo Imbelloni, TSAI; Marcos FornasariII; José Carlos FialhoIII; Raphael Sant'AnnaIV; José Antonio CordeiroV
IIDirector of the Hospital Rio Laranjeiras
IIICoordinator of the Emergency Service of the Hospital Rio Laranjeiras
IVSurgeon of the Hospital Rio Laranjeiras
VProfessor of the Escola de Medicina - FAMERP São José do Rio Preto, SP
BACKGROUND AND OBJECTIVES: Laparoscopic cholecystectomy is the treatment of choice for cholelithiasis. The objective of this study was to compare the possibility of performing laparoscopic cholecystectomy under spinal anesthesia versus general anesthesia.
METHODS: Between July 2007 and September 2008, 68 patients with symptoms of cholelithiasis were included in this study. Patients with physical status ASA I and II were randomly divided to undergo laparoscopic cholecystectomy with low-tension pneumoperitoneum with CO2 under general anesthesia (n = 33) or spinal anesthesia (n = 35). Propofol, fentanyl, rocuronium, sevoflurane, and tracheal intubation were used for general anesthesia. Hyperbaric bupivacaine 15 mg, and fentanyl 20 µg to achieve a sensorial level of T3 were used for the spinal anesthesia. Intraoperative parameters, postoperative pain, complications, recovery, patient satisfaction, and cost were compared between both groups.
RESULTS: All surgical procedures were completed with the chosen method and spinal anesthesia was converted to general anesthesia only in one patient. Pain was significantly lower at 2, 4, and 6 hours after the procedure under spinal anesthesia. The cost of the spinal anesthesia was significantly lower than that of the general anesthesia. All patients were discharged after 24 hours. In the postoperative evaluation, all patients were satisfied with the spinal anesthesia and would recommend this procedure.
CONCLUSIONS: Laparoscopic cholecystectomy with low-pressure pneumoperitoneum with CO2 can be safely performed under spinal anesthesia. Spinal anesthesia was associated with an extremely low level of postoperative pain, better recovery, and lower cost than general anesthesia.
Keywords: ANESTHESIA, General; ANESTHETIC TECHNIQUE, Regional: subarachnoid; SURGERY, Abdominal: laparoscopic cholecystectomy.
Since the introduction in 1988, laparoscopic cholecystectomy is considered the procedure of choice for the management of symptomatic cholelithiasis 1,2. The procedure usually requires general anesthesia with tracheal intubation to avoid aspiration and respiratory complications secondary to the induction of pneumoperitoneum. Regional block such as low thoracic epidural 3, spinal 4, and combined spinal-epidural 5 blocks have been used in patients with relevant medical problems. The objective of this study was more to avoid general anesthesia than to promote the benefits of regional blocks, although some authors 4 consider by reducing the incidence of sequelae that spinal anesthesia seem better suited for laparoscopic cholecystectomy. We designed an almost randomized study to compare the possibility of performing laparoscopic cholecystectomy under spinal anesthesia when compared to the gold standard, general anesthesia, in healthy patients.
The protocol was approved by the Ethics Committee of the Hospital Rio Laranjeiras. From July 2007 to September 2008, all patients who presented to the General Surgery Department for elective cholecystectomy were considered eligible for the study as long as they fulfilled the following inclusion criteria: ASA I or II, between 20 and 65 years, BMI < 32, and normal coagulation profile. Exclusion criteria were: cholecystitis, pancreatitis, and cholangitis, prior laparotomy for upper abdominal surgery, and contra-indication for spinal anesthesia. All patients signed an informed consent.
Patients were chosen at random to undergo spinal anesthesia or general anesthesia for cholecystectomy through a computer-generated list. Sealed and numbered envelopes were placed in the operating room and opened only after the arrival of the patient, so the patient and the anesthesiologist in charge of the case did not know the group of the patient.
A study to determine the size of the study groups was not undertaken. The data was collected between July 2007 and September 2008. Both anesthesia and surgery were performed by the same anesthesiologist and surgical team.
Patients did not receive pre-anesthetic medication. All patients were monitored with non-invasive blood pressure, oxygen saturation, and expired CO2. An 18F catheter was inserted in the left hand for hydration and administration of drugs. Initially, 500 mL of Ringer's lactate were infused for the administration of cephalosporin 2 g, ranitidine 50 mg, omeprazole 40 mg, dexamethasone 10 mg, ondansetron 8 mg, and metochlopramide 10 mg, before the blockade or general anesthesia. A nasogastric tube was not inserted before induction in neither group.
In the general anesthesia group, anesthesia was induced with 2.5 mg.kg-1 of propofol, 5 µg.kg-1 of fentanyl, 0.6 mg.kg-1 of rocuronium, and 1.5 mg.kg-1 of lidocaine; all patients were ventilated with oxygen under a face mask, followed by laryngoscopy and tracheal intubation. After intubation the respiratory rate was adjusted to maintain PETCO2 between 33 and 36 mmHg with a tidal volume of 8 mL.kg-1, and PEEP of 5 cmH2O. Inhalational anesthesia (sevoflurane) was administered with a circular CO2 absorber and O2 flow of 2 l.min-1. Expired concentrations of CO2, O2, and sevoflurane were monitored continuously by a gas analyzer. Residual neuromuscular blockade was antagonized with 2 mg of neostigmine and 1 mg of atropine at the end of the surgery.
In patients who underwent spinal anesthesia, fentanyl (1 µg.kg-1) and midazolam (1 mg) were administered before the puncture. With the patient in left lateral decubitus, after establishing aseptic conditions, the subarachnoid space was punctured between the L3-L4 apophyses with a 27G cut-bevel needle. Backflow of CSF confirmed the position of the needle in the subarachnoid space; after the administration of 20 µg of fentanyl, 3 mL of hyperbaric bupivacaine were injected. Afterwards, patients were placed in the supine position with a 10-degree head-down. The stylet of the needle was used to test the lack of sensitivity of the patient, which should reach the level of T3· Once the goal was achieved, the surgical table was paced in the horizontal position and the patient was cleared for surgery.
If the mean arterial pressure dropped below 60 mmHg, 2 mg of ethylephrine IV would be administered.
After the second trocar, the subdiaphragmatic surface of the liver received more 100 mg of 1% lidocaine, injected through a catheter inserted through the xiphoid process trocar. If the patient still complained of shoulder pain after the administration of lidocaine, 50 µg of fentanyl were administered. The following criteria were established for conversion of the anesthesia: the need of a nasogastric tube, organ damage, difficult to control bleeding, or if the patient was not satisfied with the spinal anesthesia in any phase of the procedure.
Laparoscopic cholecystectomy was performed according to the four-trocar standard technique. The incision was made above the navel and a Veress needle was inserted until the peritoneum. Pneumoperitoneum was induced with CO2, up to a maximal pressure of 8 mmHg in all patients in both groups. Subxiphoid, midclavicular, and lateral trocars were inserted.
A clamp was used to traction the fundus of the gallbladder laterally and anteriorly through the lateral subcostal cannula. Dissection, clipping, and electrocauterization were performed through the 10-mm epigastric port. The gallbladder was dissected and exteriorized through the epigastric port, when it was decompressed by suction and the calculi were removed. The aponeurosis of the umbilical port was sutured with absorbable suture and a bupivacaine solution was injected in all surgical wounds before closure of the skin.
The time of surgery, as well as all intraoperative incidents especially those related to the spinal anesthesia such as pain in the right shoulder, headache, nausea, vomiting, and discomfort were recorded. In both groups hemodynamic changes, the need of nasogastric tube, time of pneumoperitoneum, time of anesthesia (spinal anesthesia group: from the puncture to the dressing; general anesthesia group: from intubation to extubation), and the need to increase intra-abdominal pressure higher than 8 mmHg were evaluated. In the spinal anesthesia group the time until the blockade reached T3, the time for regression of the sensorial and motor blockade, and the total dose of midazolam were also evaluated. The costs of each anesthesia were also recorded.
In the postoperative period, all patients received conventional intravenous hydration (1.5 L of D5W over the next 24 hours) and intravenous analgesia (100 mg of ketoprofen every 8 hours and 1 g of dipyrone every 6 hours). Postoperative pain was evaluated, in both groups, by the Visual Analogue Scale at 2, 4, 6, and 12 hours after the end of the surgery. Other postoperative events related to the surgery or anesthesia, such as discomfort, nausea, vomiting, shoulder pain, urinary retention, pruritus, headache, or any other neurologic complaint, were also recorded. Patients received oral feeding in the following morning, being discharged 24 hours after the procedure, except in case of complications. Phone follow-up was maintained with all patients for one week. They were questioned about their degree of satisfaction with the procedure (good, medium, and dissatisfied).
The Student t test was used to compare means, the Mood test for medians, and percentages by the Pearson's chi-square test or Fisher exact test. The time of motor and sensorial blockade in the spinal anesthesia group was compared by the paired t test. Differences were considered significant when p < 0.05 and the Bonferroni test was used to compare the medians of pain in the Visual Analogue Scale with correction applied when considered significant only with p < 0.0125.
Between July 2007 and September 2008, 117 patients underwent laparoscopic cholecystectomies. Sixty-eight patients, 49 females and 19 males, who fulfilled the criteria agreed to participate in the study. The demographic distribution was similar in both groups (Table I). Patients were randomly assigned to undergo laparoscopic cholecystectomy under general anesthesia (n = 33) or spinal anesthesia (n = 35). One spinal anesthesia was converted to general anesthesia due to bleeding. This patient was excluded from the analysis and, therefore, 34 patients were included in the analysis.
Perioperative ethylephrine was administered to 14 (41%) patients in the spinal anesthesia group and to 1 (3%) patient in the general anesthesia group. In 12 of those cases mean arterial pressure returned to normal with one dose and two patients required two doses, and the surgery was completed without complications. Sixteen (47%) patients in the spinal anesthesia group had some degree of pain in the right shoulder. Irrigation of the lower surface of the diaphragm relieved the pain in 14 patients. However, the pain was severe enough to require the intravenous administration of fentanyl in 10 patients, which required only one dose.
The mean time (SD) for the blockade to reach T3 was 7.35 (1.05) minutes (Table II). In the spinal anesthesia group, the duration of anesthesia was similar to the duration of the surgery, both ended at the same time, while in the general anesthesia group it lasted 10 minutes more than the time of the surgery. The mean duration (SD) of the motor blockade was 3:01 (0:42) (h:min), while that of the sensorial blockade was 4:18 (0:42) (h:min) (Table III). The duration of the motor blockade was significantly shorter than that of the sensorial blockade (p < 0.0005). Significant differences were not observed in the volume of Ringer's lactate, time of the pneumoperitoneum, and total time of surgery. None of the patients in the spinal anesthesia group required a nasogastric tube while it was necessary in 14 patients in the general anesthesia group, and this difference was significant. Eight patients in the general anesthesia group, and none in the spinal anesthesia group had CO2 retention. In the general anesthesia group, it was necessary to adequate ventilatory parameters while none of the patients in the spinal anesthesia group had any complaints, and this difference was significant. It was necessary to increase the pneumoperitoneum pressure to 12 mmHg in 14 patients in the general anesthesia group to maintain surgical conditions, while it was not necessary in any patient in the spinal anesthesia group.
Table III shows surgery/anesthesia-related postoperative events such as nausea, vomiting, urinary retention, pain in the right shoulder, and pruritus. Shoulder pain was significantly less frequent in the spinal anesthesia group. None of the patients complained of post-spinal anesthesia headache or neurological sequela related to the spinal anesthesia. All patients were discharged from the hospital 24 hours after the surgery and none of the patients was readmitted for any reasons. After one week of follow-up, no late complications were observed. The cost was lower for the spinal anesthesia.
As can be seen in Figure 1, pain evaluated by the Visual Analogue Scale was significantly less severe in the spinal anesthesia group at 2, 4, and 6 hours. At 12 hours both groups had the same evaluation in the Visual Analogue Scale.
All patients in the spinal anesthesia group reported great satisfaction. In the general anesthesia group 26 patients reported great satisfaction while three reported being reasonably satisfied. This was due to having experienced severe postoperative right shoulder pain. All patients would recommend spinal anesthesia for laparoscopic cholecystectomy.
In the spinal anesthesia group all patients recovered six hours after the surgery and were ready to be discharged from the hospital, but they only received permission to leave the institution in the following day to be observed clinically, including heart rate, blood pressure, nausea, vomiting, and headache.
This study showed that there are some indications for spinal anesthesia in patients undergoing elective laparoscopic cholecystectomy. It confirmed the superiority of spinal anesthesia in the control of pain in the immediate postoperative period when compared to general anesthesia, besides having a lower cost. Laparoscopic cholecystectomy, considered a minimally invasive surgery, is usually done under general anesthesia. The advantages of this procedure, including less pain and shorter hospitalization, make spinal anesthesia the procedure of choice 1,2. Surprisingly, in the era of minimally invasive medicine the use of regional block in laparoscopic cholecystectomy has not become popular. This is due mainly to the notion that laparoscopic cholecystectomy requires tracheal intubation to prevent aspiration and respiratory complication due to the introduction of CO2 in the peritoneum 6, which would not be well tolerated by an awake patient during the procedure 1. In the present study, spinal anesthesia did not produce any modification in surgical technique except for the reduction in peritoneal pressure to 8 mmHg to avoid vagal reflexes and bradycardia. Comparing spinal block to general anesthesia, conversion of the anesthesia due to technical difficulty or respiratory problems was not necessary. However, one patient experienced pain after bleeding which indicated the need of conversion to general anesthesia. This patient was excluded from the protocol.
We conclude that spinal anesthesia is associated not only to low mortality indices, but also to a lower incidence of severe complications such as deep venous thrombosis, pulmonary embolism, pneumonia, respiratory depression, myocardial infarction, and renal failure when compared to general anesthesia 7. In another series, spinal anesthesia was associated with a lower incidence of postoperative complaints and treatments as well as shorter observation time when compared to general anesthesia 8. Consequently, laparoscopic cholecystectomy under spinal anesthesia should be an appropriate method. In the present study we used a low dose of midazolam (3 mg) for sedation, residual anesthesia (sensorial blockade) lasted 4.18 hours, with a low incidence of nausea and vomiting, and at a lower cost than general anesthesia.
Unlike other authors 9, a nasogastric (NG) tube was not used routinely in both groups. The determination of its real need was part of the protocol. We believe that the nasogastric tube is uncomfortable in awaken patients, and its need would be one of the criteria for conversion of the anesthesia. None of 34 patients in the spinal anesthesia group required a NG tube compared to 14 patients in the general anesthesia group. This confirms that the anesthesiologist by inflating the stomach while ventilating with a face mask during induction and before intubation is the main responsible for the need of a nasogastric tube.
Unlike other studies 9, this is a comparative study and we believe that the majority of our patients had better experience of postoperative analgesia than those undergoing general anesthesia during this period. This is particularly true during the first six hours after the procedure, most likely due to two factors: absence of a tracheal tube and its discomforts, and presence of an adequate level of analgesia, and analgesia in the first postoperative hours due to the choice of agents used in the subarachnoid space. The use of head-down after the administration of the opioid and hyperbaric anesthetic was responsible for the differential between the sensorial blockade which lasted 4:18 (0:42) hours, and the motor which lasted 3:01 (0:42) hours. Our data confirms the superiority of the spinal anesthesia' over general anesthesia in the control of postoperative pain.
This study has proven that laparoscopic cholecystectomy can be successful using the classic and well-tested pneumoperitoneum with CO2 with a lower pressure, and with less if any discomfort 9,10. Pain in the shoulder related to laparoscopy is attributed to irritation of the lower surface of the diaphragm by carbon dioxide during the pneumoperitoneum 3,4,9. Occasionally, this can be severe enough to lead to conversion of the anesthetic technique 4. After introduction of CO2, 18 out of 34 patients did not report pain in the shoulder. In the remaining 16 patients, local irrigation of the right hemidiaphragm with 100 mg of 1% lidocaine relieved the symptoms. After relief of the shoulder pain, the surgery progressed without any problems. The use of midazolam prevents the recall of any event during the immediate postoperative period.
In the immediate postoperative period, eight out of 33 patients in the general anesthesia group, and two out of 34 patients in the spinal anesthesia group developed pain in the right shoulder. We believe that the use of 100 mg of lidocaine on the right hemidiaphragm contributed for the reduction in the incidence of shoulder pain. For this reason, lidocaine was adopted as a routine in patients who undergo general anesthesia.
The negative effects of the pneumoperitoneum with CO2 on the respiratory function have been widely investigated 11. Usually CO2 is used for safety due to its high water solubility and its high capacity of exchange in the lungs. The concentration of CO2 can be easily monitored by capnography and controlled by ventilation 12. Pneumoperitoneum induces systemic effects due to the absorption of CO2, and in venous return due to the increase in intra-abdominal pressure 13. Initially, absorption of CO2 increases its elimination in the expired air, in the arterial and venous blood 13,14. This carboxemia induces metabolic and respiratory acidosis decreasing arterial and mixed venous pH and arterial pO2 12,14. Absorption of CO2 affects negatively the respiratory function 15, which is not observed with inert gases such as helium and argon. Minute ventilation, peak inspiratory pressure, pulmonary vascular resistance, alveolar concentration of CO2, calculated physiological short circuit, central venous pressure, diastolic and systolic blood pressure, systemic vascular resistance, and cardiac index are all increased 12,13. Those effects are more pronounced in patients with pulmonary and cardiac adaptation 12 and in long procedures in endoscopies and forced head-down. Very high intra-abdominal pressure is associated with a reduction in visceral blood flow and glomerular filtration 13. SpO2 and PETCO2 remained within normal limits during the procedure confirming that spinal anesthesia can be safe even without tracheal intubation. Retention of CO2 and hypoxemia were not observed in the spinal anesthesia group during the procedure.
Some surgeons prefer high pressures (14 mmHg) while others maintain lower pressures (11 mmHg 4 or 10 mmHg 3,6,9). We chose a low pressure of up to 8 mmHg to reduce diaphragmatic irritation. This pressure was the same used in the general anesthesia group. Spinal anesthesia offered sensorial and motor blockade up to a level high enough to avoid the use of muscle relaxants, which are usually necessary when general anesthesia is used. It was not necessary to increase the pressure of the pneumoperitoneum in the spinal anesthesia group while, in the general anesthesia group, it was necessary in 14 patients, which could be explained by the pressure necessary to ventilate the patient. Abdominal relaxation was adequate in all 34 patients in the spinal block group.
Intraoperative hypotension is another problem in laparoscopic cholecystectomy under spinal anesthesia 4,9,10. Hypotension was observed in 17/29 patients 10, in 29/50 patients 16, while in the present study 14/34 patients in the spinal anesthesia group developed hypotension. Intravenous ethylephrine was successful for the treatment of all cases.
Postoperative nausea and vomiting are relatively common after laparoscopic cholecystectomy under general anesthesia 17. One of our patients developed postoperative nausea and vomiting, while three patients in the general anesthesia group developed this complication. In another series with laparoscopic cholecystectomy under spinal anesthesia, nausea and vomiting were not common 4,9,10. The surgical technique was not different than that of general anesthesia indicating, therefore, that the low incidence of nausea and vomiting seems to be related to the spinal anesthesia 10.
Recently, the authors 18 reported the importance of achieving high-quality analgesia in the immediate postoperative period if one intends to maintain effective analgesia related to the regional block. The spinal anesthesia is a vital prerequisite for this success. In a recent study with 3,492 patients, the spinal block was the technique of choice for laparoscopic cholecystectomy 19. To conclude, this is a retrospective, controlled, randomized study that provided evidence that spinal anesthesia can be an effective technique for elective laparoscopic cholecystectomy with low pressure CO2, for the pneumoperitoneum, and it can be an alternative for general anesthesia.
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Correspondence to: Submitted on July 20, 2009 Received from the Hospital Rio Laranjeiras, Rio de Janeiro, RJ
Dr. Luiz Eduardo Imbelloni
Av. Epitácio Pessoa, 2356/203 Lagoa
22471-072 - Rio de Janeiro, RJ, Brasil
Approved on February 8, 2010
Submitted on July 20, 2009
Received from the Hospital Rio Laranjeiras, Rio de Janeiro, RJ