Use Of Intravenous Patient-controlled Analgesia Research Articles

Adductor Canal Block versus Intravenous Patient Controlled Analgesia for Postoperative Pain Control for Primary Total Knee Arthroplasty

Abstract Background Uncontrolled postoperative pain has an adverse sequel of delayed resumption of normal pulmonary function, restriction of mobility, nausea and vomiting, increase in the systemic vascular resistance, cardiac work, and myocardial oxygen consumption through an increase in the catecholamine release induced by the stress response. Aim of the Work to compare efficacy, hemodynamic effects, opiate consumption and side effects of Adductor canal block and intravenous patient-controlled analgesia (PCA) in terms of postoperative primary total knee arthroplasty analgesia. Patients and Methods The study was performed upon 60 patients, randomly distributed into two equal groups: Group I: Patients of this group underwent ultrasound guided single shot adductor canal block after the end of surgery and before extubation with 20 ml of bupivacaine 0.5% and Group II: Patients of this group received intravenous patientcontrolled analgesia (PCA) with Nalbuphine after the end of surgery and before extubation. For each patient, the following data were collected: age, sex, weight, height, ASA, hemodynamic changes, VAS, Nalbuphine extradoses consumption, Side effects such as nausea, vomiting, pruritus, urinary retention and hypotension were recorded. Orthopedic rehabilitation indices were assessed by physiotherapy staff. Results ACB provided more effective analgesia for the first 6 hours but PCA with nalbuphine was superior after and for the rest of 24 postoperative hours. Conclusions Adductor canal block had good control of pain for the first 6 postoperative hours. However, the conventional use of intravenous PCA containing opioids was more effective for the rest of the first 24 postoperative hours.

The transversus abdominis plane block in conjunction with intrathecal morphine use after cesarean section in women with severe pre-eclampsia: a randomized controlled trial

BackgroundThe transversus abdominis plane (TAP) block in conjunction with intrathecal morphine has been demonstrated to provide more superior postcesarean analgesia to intrathecal morphine alone. However, the analgesia efficacy of their conjunction has not been demonstrated in patients with severe pre-eclampsia. The study aimed to compare the postcesarean analgesia of TAP block in conjunction with intrathecal morphine versus intrathecal morphine alone in women with severe pre-eclampsia.MethodsPregnant women with severe pre-eclampsia undergoing planned cesarean section were randomly allocated into 2 groups to receive TAP block with 20 ml of 0.35% Ropivacaine (TAP group) or with the same volume of 0.9% saline (Sham group) after undergoing elective cesarean section under spinal anaesthesia with 15 mg of 0.5% Ropivacaine plus 0.1 mg of morphine. The outcomes for this analysis include the visual analog scale (VAS) pain score at rest and with movement at 4,8,12,24 h after TAP block was performed, times of use of intravenous patient-controlled analgesia (PCA) within 12 h after anesthesia, the occurrence of maternal side effects, maternal satisfaction, and Apgar score at 1 and 5 min of newborns.Results119 subjects receive TAP block with 0.35% Ropivacaine (n = 59)or 0.9% saline (n = 60). At 4,8, 12 h after TAP block, the TAP group reported lower VAS score at rest [at 4 h: 1(0,1) vs. 1(1,2), P < 0.001; at 8 h:1(1,1) vs. 1(1.5,2),P < 0.001; at 12 h:1(1,2) vs. 2(1,2),P = 0.001] and higher satisfaction [53(89.9%) vs.45(75.0%), P < 0.05]. There were no differences between groups in VAS score at 24 h at rest and at all time points above with movement, times of use of PCA within 12 h after anesthesia, maternal side-effect, and Apgar score at 1 and 5 min of newborns.ConclusionsIn conclusion, The TAP block performed in conjunction with intrathecal morphine may not reduce opioid consumption, but it could reduce VAS scores at rest in the first 12 h after cesarean section in women with severe pre-eclampsia, and improve maternal satisfaction, which is worthy of clinical promotion.Trial registrationRegistered at Chinese Clinical Trial Registry(http://www.chictr.org.cn) on 13/12/2021: ChiCTR2100054293.

Postoperative Pain in Patients Undergoing Cancer Surgery and Intravenous Patient-Controlled Analgesia Use: The First and Second 24h Experiences.

Postoperative cancer pain imposes severe physical and psychological problems. We aimed to investigate the pain experiences of patients with cancer after surgery, analyze the impact of infusion volume by patient-controlled analgesia (PCA), and explore the variations between day1 and day2. Data were retrospectively extracted from a large health data platform. Descriptive statistics were presented for the demographic and clinical profiles of patients. Multiple logistic regression analyses were performed to evaluate associations between intensity of pain and PCA use after adjustment for risk factors. Among 11,383 patients with cancer, the incidence of pain (moderate to severe pain) was 93.3% (18.3%) at the first 24h after operation, while the respect values decreased to 91.1% and 9.5% at the second 24h. Further, female patients consistently experienced higher risk of pain over the whole 48h postoperatively. Surgical sites were related to pain risk, with the highest risk among the respiratory system (OR 2.077, 95%CI 1.392-3.100). High doses of continuous volume (OR 2.453, 95%CI 1.742-3.456) and total volume (OR 2.830, 95%CI 2.037-3.934) of infusions were related to 1-3-fold elevated pain risk. Additionally, the observed associations were mostly repeated and could be up to over 10 times when pain was evaluated with number of PCA pump compressions instead of Numerical Rating Scale (NRS). High risk of postoperative cancer pain, particularly among the high PCA dose group, could possibly indicate inadequate pain control, and presence of modifiable risk factors warrants more aggressive pain management strategies perioperatively.

Association of Patient Controlled Analgesia and Total Inpatient Opioid Use After Pancreatectomy.

The initial settings on an intravenous patient-controlled analgesia (IV-PCA) pump can represent a significant source of postoperative opioid exposure. The primary aim of this study was to evaluate the impact of first day IV-PCA use on total inpatient opioid use after open pancreatectomy, before and after standardization of initial dosing. Inpatient oral morphine equivalents (OMEs) were reviewed for pancreatectomy patients treated with IV-PCA at a single institution before and after (3/2016-8/2017 versus 3/2019-11/2020) implementation of a standardized initial IV-PCA dosing regimen (initial limit 0.1mg hydromorphone, or 1mg OME, every 10min as needed). IV-PCA OME in the first 24h and the total inpatient OME were compared between cohorts. Of 220 total patients, 132 were in the prestandardization (PRE) historical cohort. A first-24-h IV-PCA use was different (PRE median 95mg versus poststandardization [POST] 15mg, P<0.001). The median total inpatient OME was different (P<0.001) between PRE (525mg, interquartile range [IQR] 239-951mg) and POST patients (129mg, IQR 65-204mg) with 77% (median 373mg) of total inpatient OMEs contributed by IV-PCA in the PRE and 56% (median 64mg) in the POST cohorts. There were similar patient-reported pain scores between groups. Standardizing initial IV-PCA settings was associated with a reduced first-24-h opioid exposure, proportional and absolute total IV-PCA use, and total inpatient OMEs. Because of the contribution of an IV-PCA to the total inpatient opioid exposure, purposeful reduction or omission of an IV-PCA is critical to perioperative opioid reduction strategies.

Comparing Analgesia on an As-Needed Basis to Traditional Intravenous Patient-Controlled Analgesia Within Fast-Track Orthopedic Procedures: A Randomized Controlled Trial

BackgroundThe aim was to determine if the use of intravenous patient-controlled analgesia (IVPCA) in a fast-track joint replacement program is associated with increased use of perioperative opioid consumption and increased length of hospital stay. DesignA prospective, double-blind, randomized controlled trial. SettingsAcademic hospital. Participants/SubjectsA total of 80 patients aged 18-85 years, with body mass index (BMI) 18-40, undergoing elective total knee arthroplasty were recruited. MethodsPre-operatively, patients received gabapentin, celecoxib, and acetaminophen. Peri-operatively, patients received spinal anesthesia with morphine and fentanyl, and periarticular local anesthetic administration by the surgeon. Postoperatively, 80 patients were randomized by a computer-generated sequence into IVPCA group (group A, n = 40) and non-IVPCA group (group B, n = 40). ResultsThe primary outcome was 48-hour postoperative opioid consumption and length of hospital stay. Secondary outcomes included side effects of opioids, patient satisfaction, and pain scores. There was no significant difference within 48-hour postoperative opioid consumption (median 61.3 vs. 87.5, p = .181) and length of hospital stay (median 49.8 hours vs. 49.5 hours; p = .89) between the two groups. Also, there was no significant difference in patient satisfaction (median 5 in both groups), pain scores, and opioid-related side effects. ConclusionsIVPCA was associated with nonsignificant reduction in opioid exposure in elective total knee arthroplasty surgery within 48 hours. Neither group was superior in terms of length of hospital stay, opioid related side-effects, pain scores, and patient satisfaction.

Short-term outcomes of laparoscopic versus open total gastrectomy after neoadjuvant chemotherapy: a cohort study using the propensity score matching method.

Until now, little is known about the benefit of laparoscopic total gastrectomy (LTG) after neoadjuvant chemotherapy (NACT). This study was designed to compare the safety and efficacy of the LTG versus the open total gastrectomy (OTG) approach after NACT treatment in patients with advanced gastric cancer (AGC). This study involved a cohort of 145 patients with AGC who underwent total gastrectomy after NACT at our centre between April 2013 and August 2018 including 24 cases of LTG and 121 OTG. The baseline characteristics were matched based on 1:2 balanced propensity score-matching method. Sixty-nine marched cases were finally analysed (23 LTG vs. 46 OTG). All patients underwent R0 resection. Compared to the OTG group, the LTG group had a longer surgery duration (P<0.001), but a shorter incision length (P<0.001) and less intravenous patient-controlled analgesia (IV-PCA) time after surgery (P=0.027). No statistical differences were observed in terms of blood loss, retrieved lymph nodes (LNs), resection margin, length of stay, postoperative pain intensity, and complications (P>0.05). LTG had comparable safety and histological findings to OTG after NACT in the perioperative period; however, LTG is less invasive and patients can benefit from less IV-PCA use. Further research is needed to investigate long-term effects. Gastric cancer (GC); neoadjuvant chemotherapy (NACT); safety; laparoscopic technique.

Anesthetic and analgesic approach in total knee arthroplasty: A national survey study

Aim: Although the optimum anesthetics and analgesic choice for total knee arthroplasty is a heavily debated topic in recent years, the failure to reach any ideal consensus on this topic leads clinicians to adopt different approaches. This study was conducted to assess differences in general anesthetic and analgesic approaches toward the total knee arthroplasty across Turkey. Materials and Methods: Our 28-item survey was presented online to physicians who work as Anesthesiology and Reanimation specialists in Turkey and agreed to participate in the study. The survey includes questions about the techniques preferred by the clinicians in the management of anesthesia and postoperative analgesia in TKA and the main reasons underlying their preferences. Results: 255 anesthesiologists, i.e. 72 (28.1%) faculty members and 183 (71.9%) specialists, completed the study in full. According to our survey, spinal anesthesia (61.3%) comes first in the selection of an anesthetic method in TKA, followed by the Combined Spinal-Epidural Anesthesia (32.4%). The spinal anesthesia is the most frequently preferred method in training and state hospitals and Combined Spinal-Epidural Anesthesia is the most frequently preferred method in private hospitals. The use of peripheral nerve blocks is 49.8% (127). Femoral nerve block is preferred with 79.7%, followed by adductor canal block with 36.1%. The rate of use of intravenous patient-controlled analgesia is 38.1% and the most commonly preferred analgesia is Tramadol (69.1%). 63.1% of those using epidural anesthesia do not use any epidural patient-controlled analgesia device. The physicians reported that the lack of a team to follow up epidural patient-controlled analgesia device (50.9%) as the most common reason for not choosing epidural patient-controlled analgesia. Conclusion: Regional anesthesia is the first preference in the anesthesia management of total knee arthroplasty in our country. In postoperative analgesia practice, peripheral nerve blocks are preferred at a higher rate than epidural and intravenous patient-controlled analgesia.

Factors associated with success and failure of patient-controlled oral analgesia after total hip and knee arthroplasty: a historical comparative cohort study.

Patient-controlled oral analgesia (PCOA) is a novel method of oral opioid administration using set doses of short-acting oral opioids self-administered by patients with a "lockout" period as part of a multimodal regimen. Failure of PCOA can result in severe postoperative pain necessitating use of intravenous patient-controlled analgesia (IV-PCA) with its potential complications. This study evaluated factors related to success or failure of PCOA following total hip arthroplasty (THA) and total knee arthroplasty (TKA). We conducted a retrospective cohort study of all adults who underwent THA and TKA at our institution by extracting data from the proprietary database of our acute pain service. Patient, anesthetic, and surgical variables associated with PCOA failure defined as inadequate analgesia requiring conversion to IV-PCA within 24 hr following THA and TKA were evaluated. Univariable and multivariable logistic regression analyses were performed to identify predictors of PCOA failure. Of the 926 patients who underwent THA or TKA (n = 411 and 515, respectively), 147 (15.9%) patients (67 THA and 80 TKA patients) had PCOA failure with moderate-to-severe pain. Multivariable regression analysis showed that PCOA failure occurred in those with younger age (adjusted odds ratio [aOR] per year of age, 0.97; 99% CI, 0.95 to 0.99; P < 0.001), preoperative chronic use of controlled-release opioids (aOR, 3.45; 99% CI, 1.60 to 7.35; P < 0.001), and with the use of general anesthesia vs spinal anesthesia (aOR, 2.86; 99% CI, 1.20 to 6.84; P = 0.002). The use of PCOA provides adequate analgesia to a majority of patients undergoing THA and TKA. Factors predictive for PCOA failure should be considered when choosing the primary breakthrough analgesic modality following THA/TKA.

Droperidol Reduces Postoperative Nausea and Vomiting and Supports the Continuation of Intravenous Patient-Controlled Analgesia with Fentanyl.

To examine the impact of adding droperidol to fentanyl-based intravenous patient- controlled analgesia (IVPCA) on the discontinuation of IVPCA use due to postoperative nausea and vomiting (PONV). Patients who underwent surgeries other than abdominal surgeries and used IVPCA between April 2014 and March 2018 were selected. Patients using IVPCA with fentanyl alone were compared to patients using droperidol added to IVPCA. Patients were allocated to one of two groups depending on the drug used for IVPCA: 1) control group, fentanyl alone; 2) droperidol group, droperidol with fentanyl. The primary endpoint was the discontinuation of IVPCA due to PONV. Secondary endpoints included PONV within 48 hours after surgery, the number of antiemetics used, pain score, and adverse effects. Propensity score matching was used to control the differences in clinical features among patients. Among the 793 patients initially enrolled in this study, 145 were excluded via propensity score matching; 364 of the remaining patients received IVPCA supplemented with droperidol. Propensity score matching showed that discontinuation of IVPCA due to PONV was significantly decreased in the droperidol group compared to the control group (P = 0.01). Further, compared with the control group, the droperidol group had reduced nausea up to 24 hours after surgery (P < 0.01), and the number of vomiting episodes and use of antiemetics decreased within 12 hours after surgery (P < 0.01). The addition of droperidol to IVPCA is associated with a decrease in PONV, as well as the improved continuation of pain treatment with fentanyl-based IVPCA, similar to IVPCA with morphine. However, it is necessary to monitor the side effects of this treatment.

Enhanced Recovery after Lumbar Spine Fusion: A Randomized Controlled Trial to Assess the Quality of Patient Recovery.

Prospective trials of enhanced recovery after spine surgery are lacking. We tested the hypothesis that an enhanced recovery pathway improves quality of recovery after one- to two-level lumbar fusion. A patient- and assessor-blinded trial of 56 patients randomized to enhanced recovery (17 evidence-based pre-, intra-, and postoperative care elements) or usual care was performed. The primary outcome was Quality of Recovery-40 score (40 to 200 points) at postoperative day 3. Twelve points defined the clinically important difference. Secondary outcomes included Quality of Recovery-40 at days 0 to 2, 14, and 56; time to oral intake and discharge from physical therapy; length of stay; numeric pain scores (0 to 10); opioid consumption (morphine equivalents); duration of intravenous patient-controlled analgesia use; complications; and markers of surgical stress (interleukin 6, cortisol, and C-reactive protein). The analysis included 25 enhanced recovery patients and 26 usual care patients. Significantly higher Quality of Recovery-40 scores were found in the enhanced recovery group at postoperative day 3 (179 ± 14 vs. 170 ± 16; P = 0.041) without reaching the clinically important difference. There were no significant differences in recovery scores at days 0 (175 ± 16 vs. 162 ± 22; P = 0.059), 1 (174 ± 18 vs. 164 ± 15; P = 0.050), 2 (174 ± 18 vs. 167 ± 17; P = 0.289), 14 (184 ± 13 vs. 180 ± 12; P = 0.500), and 56 (187 ± 14 vs. 190 ± 8; P = 0.801). In the enhanced recovery group, subscores on the Quality of Recovery-40 comfort dimension were higher (longitudinal mean score difference, 4; 95% CI, 1, 7; P = 0.008); time to oral intake (-3 h; 95% CI, -6, -0.5; P = 0.010); and duration of intravenous patient-controlled analgesia (-11 h; 95% CI, -19, -6; P < 0.001) were shorter; opioid consumption was lower at day 1 (-57 mg; 95% CI, -130, -5; P = 0.030) without adversely affecting pain scores (-2; 95% CI, -3, 0; P = 0.005); and C-reactive protein was lower at day 3 (6.1; 95% CI, 3.8, 15.7 vs. 15.9; 95% CI, 6.6, 19.7; P = 0.037). Statistically significant gains in early recovery were achieved by an enhanced recovery pathway. However, significant clinical impact was not demonstrated.

Impact of first-day intravenous patient controlled analgesia use on total inpatient opioid use after pancreatectomy

Impact of first-day intravenous patient controlled analgesia use on total inpatient opioid use after pancreatectomy

Patient-controlled analgesia for background pain of major burn injury.

Studies have suggested that intravenous patient-controlled analgesia (IV-PCA) can be used safely for the treatment of background pain in burn patients. However, no comprehensive protocols have been published. How patient or surgical factors correlate with the amount of opioid consumption remains unclear. The aim of this study is to provide an IV-PCA protocol for alleviating pain for burn injuries, and to assess factors correlated with opioid consumption. At the Mackay Memorial Hospital, a retrospective analysis from June 27th to October 31st of 2015 was carried out to investigate the use of IV-PCA in relation to the demographic and clinical data of patients who suffered from burn injuries due to a massive explosion of flammable powder. A standardized morphine IV-PCA protocol with rapid escalation was implemented. Variables assessed included age, weight, gender, days of usage, total surface area burned (TBSAB) and operations. Among the 23 patients who received IV-PCA for burn pain control, it was noted that the larger the TBSAB and the higher the visual analogue scale (VAS), the more amount of morphine was consumed. Correlations between morphine consumption positively with weight (P<0.01), female gender (P<0.01), severity of injury (P=0.01), and negatively with receiving operations (P=0.01) were statistically significant. As the daily morphine consumption was positively correlated with TBSAB, VAS, weight, female gender, the use of our IV-PCA protocol was sufficient in the management of background pain for patients with major burn injury.

Pain management following the Nuss procedure: a survey of practice and review.

Pectus excavatum is the most common congenital chest wall deformity. The Nuss procedure is frequently used for surgical correction and this technique has been associated with severe and prolonged post-operative pain. At the present time, the optimal analgesic strategy for managing patients following this procedure has not been determined. A web-based survey was sent to representatives from 108 primarily pediatric hospitals in North America, Europe, Asia and Australia. One individual per institution was contacted to complete the survey on behalf of their department. Survey response rate was 54% and 55 institutions reported using the Nuss procedure for correction of pectus excavatum. Annual case volume is less than or equal to 25 cases in 57% of institutions, and the most common age of patients is 14 to 17 years old. A clinical protocol for patient post-operative pain management is used in 45% of institutions. Thoracic epidural is utilized as a primary analgesic modality by 91% of institutions. Concomitant use of intravenous patient-controlled analgesia is reported by 27% of institutions. Nine respondents (16%) reported that they had recently stopped performing epidurals because of surgeon preference. Referral of one or more patients annually for chronic pain management was reported in 22% of surveys. Post-operative pain management following the Nuss procedure is variable and poorly characterized. Clinical trials or large observational registries comparing the safety and efficacy of primary modalities and long-term outcomes are needed to enable evidence-based decision-making for the management of these patients.

Intravenous Patient-controlled Analgesia Has a Positive Effect on the Prognosis of Delirium in Patients Undergoing Orthopedic Surgery.

BackgroundPostoperative delirium is relatively common. However, the relationship between intravenous patient-controlled analgesia (IV-PCA) and delirium has not been thoroughly investigated. The aim of this study was to evaluate the effects of IV-PCA on the prognosis of postoperative delirium in patients undergoing orthopedic surgery.MethodsMedical records of 129 patients with postoperative delirium were reviewed. Patients were divided into two groups according to whether they used IV-PCA with fentanyl and ketorolac. The IV-PCA group consisted of 73 patients who were managed with IV-PCA; the NO-PCA group consisted of 56 patients who were managed without PCA.ResultsIncidences of multiple psychiatric consultations and prolonged delirium were significantly lower in patients using IV-PCA with fentanyl and ketorolac than in those without PCA.ConclusionsWe recommend the use of IV-PCA for pain control and management of delirium in patients with postoperative delirium.

Effects of Adding Ketamine to Fentanyl Plus Acetaminophen on Postoperative Pain by Patient Controlled Analgesia in Abdominal Surgery

Background:Postoperative pain is one of the most important complications encountered after surgery. A number of options are available for treating pain following surgery. One of those options is the use of intravenous patient-controlled analgesia (PCA). Ketamine is an anesthetic drug relieving pain with its NMDA receptor antagonistic effect.Objectives:This study is aiming at better pain management after abdominal surgery; the effects of adding ketamine to intravenous fentanyl plus acetaminophen PCA were evaluated.Patients and Methods:In a double-blind randomized clinical trial 100 patients, ASA I or II, 20 - 60 years old were divided into two groups. These patients were abdominal surgery candidates. In order to control postoperative pain in the control group an IV patient-control analgesia (PCA) containing fentanyl 10 μg/mL plus acetaminophen 10 mg/mL was instructed to be used for the patients, but the patients in ketamine group received ketamine 0.5 mg/mL plus control group PCA content. During the first 48 hours after surgery, ketamine patients were evaluated every 8 hours (at rest, while moving and coughing) to determine their pain scores using VAS scale, sedation score, additional analgesics, nausea and vomiting.Results:There were no significant demographic differences between two groups. Pain scores (at rest, while moving and coughing) during the first 48 hours were not significantly different between two groups (P values = 0.361, 0.367 and 0.204, respectively). Nausea scores were significantly lower in the ketamine group (P = 0.026).Conclusions:The addition of ketamine to intravenous fentanyl plus acetaminophen PCA had not extra effects in relieving post abdominal surgery pain.

Safety profile of intravenous patient-controlled analgesia for breakthrough pain in cancer patients: a case series study

The WHO analgesic ladder supports medication choice according to pain intensity. The use of the analgesic ladder in an inverse way, has the advantage of using the same principles of the original ladder to treat crisis of pain in cancer patients. The purpose of this study is to describe the use of intravenous patient-controlled analgesia (IV-PCA) technique in patients admitted to an oncological Hospital. This is a case series study. Patients assigned to receive IV-PCA between March 2011 and May 2012 were selected for the study. Medical records were reviewed, patients stratified according to the Karnofsky Performance Score (KPS). The primary outcome was to verify if different IV-PCA opioid solutions could be equally effective providing pain relief. Secondary outcomes were the incidence of clinical side effects that can be associated to IV-PCA infusions. A total of 95 medical records were reviewed. Most patients used IV-PCA with morphine (42.1 %), fentanyl (42.1 %) or methadone (15.7 %) to treat exacerbation periods of cancer pain. IV-PCA used as supplementary therapy successfully improved pain control in 78.9 % of the patients, without any difference related to opioid solution. KPS <40 was related to higher rate of pain relief, without any difference in side effects in this group of patients. The most common side effects were sedation (10.5 %) followed by constipation (9.4 %) and nausea (4.2 %). Morphine presented a higher risk than fentanyl for sedation. Analgesia-related delirium or respiratory depression were not reported in this case series study. IV-PCA provided timely, safe and useful analgesia for patients with severe breakthrough pain and may be useful to help titration of opioids, weaning to oral analgesia and to decide for interventional procedures.

The efficacy of automated intermittent boluses for continuous femoral nerve block: a prospective, randomized comparison to continuous infusions

Study ObjectiveTo determine whether an automated intermittent bolus technique provides enhanced analgesia compared with a continuous infusion for femoral nerve block. DesignProspective, single-blinded, randomized controlled trial (ClinicalTrials.gov Identifier: NCT01226927). SettingPerioperative areas and orthopedic surgical ward of a university hospital. Patients45 ASA physical status 1, 2, and 3 patients undergoing unilateral primary total knee arthroplasty. InterventionsAll patients received single-injection sciatic and femoral nerve blocks plus femoral nerve catheter placement for postoperative analgesia. Patients were randomly assigned to an automated intermittent bolus (5 mL every 30 min with 0.1 mL/hr basal rate) or a continuous infusion (10.1 mL/hr) delivery method of 0.2% ropivacaine. MeasurementsConsumption of intravenous patient-controlled analgesia (IV-PCA) and visual analog scale (VAS) pain scores were assessed postoperatively at set intervals until the morning of postoperative day (POD) 2. Main ResultsThe mean (SEM) cumulative IV-PCA dose (mg of hydromorphone) for the 36-hour postoperative interval measured was 12.9 ± 2.32 in the continuous infusion rate group (n = 20) and 7.8 ± 1.02 in the intermittent bolus group [n = 21, t(39) = 2.04, P = 0.048; a 39 ± 14% difference in total usage]. Pain scores were statistically significantly lower in the intermittent bolus group in the afternoon of POD 1 (t(39) = 2.47, P = 0.018), but were otherwise similar. ConclusionsAn automated intermittent bolus infusion technique for femoral nerve catheters is associated with clinically and statistically significantly less IV-PCA use (ie, an opioid-sparing effect) than a continuous infusion technique.

A Cost Utilization Analysis of Intrathecal Therapy for Refractory Cancer Pain: Identifying Factors Associated with Cost Benefit

Intrathecal therapy (ITT) for cancer pain is characterized by high initial cost followed by low maintenance costs. Non-ITT pain management is associated with steadily increasing cumulative cost that can equal the cost of ITT over time. The intent of this modeling project is to identify factors associated with relatively rapid achievement of cost-benefit with ITT. A retrospective chart review was performed on 36 patients with cancer pain who underwent ITT and survived beyond 4 weeks. Data on the cost of conventional opioid therapy prior to ITT and at 4-6 weeks were collected and projected over time. ITT costs included all intrathecal pump implantation and maintenance costs. Pre-ITT opioid regimens were stratified into high-cost conventional (HCC-high-dose, nongeneric, or use of intravenous patient-controlled analgesia, N = 12) and low-cost conventional (low-dose or generic, N = 24) regimens. The median daily cost of opioid medications pre-ITT was $21.26 (25th-75th percentile $10.31-78.85, range 0-$971.97) vs $0 (25th-75th percentile $0-0.70), P = 0.007, post-ITT. In the HCC group, the median daily cost was $172.47 (25th-75th percentile $67.29-406.20). The median daily cost of ITT medications was $16.01 (25th-75th percentile $9.52-23.23).When these data were used to model costs over the long term, including pump implantation costs, cost-benefit for all patients compared with conventional therapy was predicted at 344 months but at 7.4 months in the HCC group. Seven patients (19%) achieved cost equivalence within 6 months and three of these within the first 3 months. In selected patients on high-cost opioid regimens, ITT may become cost-beneficial within 6 months. Factors associated with earlier attainment of ITT cost-benefit include the use of parenteral therapy, high-dose opioids, and the use of nongeneric opioid products.

The willingness of patients to pay for intravenous patient-controlled analgesia in Korea.

BackgroundThe use of intravenous patient-controlled analgesia (IV-PCA) has been increasing because it has advantages such as improved pain relief, greater patient satisfaction, and fewer postoperative complications. However, current research has not considered the patients' thoughts about IV-PCA's cost-effectiveness. The purpose of this study was to investigate the willingness to pay (WTP) for IV-PCA and the relationship between patients' characteristics and WTP in Korea.MethodsWe enrolled 400 adult patients who were scheduled for elective surgery. The patient was requested to indicate a series of predefined amounts of money (Korean won; 30,000/50,000/100,000/150,000/200,000/300,000/500,000). We also recorded patient characteristics, such as age, sex, type of surgery, IV-PCA history, education level, the person responsible for medical expenses, type of insurance, net annual income, and residential area. Three days after surgery, we asked about the degree of satisfaction and the WTP for IV-PCA.ResultsFor IV-PCA, the median WTP was 100,000 won (25-75%; 50,000-200,000 won: US$1 = W1078.04; July 19, 2011) before surgery. All patients' characteristics were not related to preoperative WTP for IV-PCA, whereas the increase in WTP after surgery showed a tendency correlated to higher IV-PCA satisfaction.ConclusionsThe median WTP was 100,000 won. The satisfaction of IV-PCA increased patients' WTP after surgery, but the WTP may be independent of patient characteristics in Korea.

The effect of patient-controlled intravenous analgesia on postoperative hypokalemia in patients undergoing laparoscopic cholecystectomy

We investigated whether hypokalemia developed during the postoperative period and whether the use of intravenous patient-controlled analgesia (IV-PCA) could decrease the incidence of postoperative hypokalemia in patients who underwent laparoscopic cholecystectomy. Sixty patients undergoing laparoscopic cholecystectomy were randomly assigned to either IV-PCA (n=30) or control (n=30) groups. We measured serum potassium concentration at the outpatient department (T1), at 8:00a.m. on the day of surgery (T2), at 6h after the end of surgery (T3), and at 8:00a.m. on the first (T4), second (T5), and third (T6) postoperative days. Serum potassium concentration, incidence of hypokalemia, mean blood pressure, heart rate, respiratory rate, and the patient-reported visual analogue scale score were compared within each group and between groups at each time point. Serum potassium concentrations in all patients showed a significant decrease at T2-T4 compared to the preoperative concentration (T1). Serum potassium concentrations at T3 and T4 in the IV-PCA group were significantly higher than those in the control group. Also, the incidence of hypokalemia at T3 and T4 was significantly lower in the IV-PCA group. Mean blood pressure and heart rate were significantly lower in the IV-PCA group than in controls at T3 and T4. The results show that hypokalemia developed during the perioperative period and the use of IV-PCA in patients undergoing laparoscopic cholecystectomy effectively decreased the degree and incidence of postoperative hypokalemia on the day of the operation and postoperative day one.