[Do pain therapy patients benefit from their fellow patients? : A retrospective observational study on the influence of the stage of pain management and therapy experience of fellow patients on the individual therapy success in an inpatient interdisciplinary multimodal pain therapy (IMPT)]. / Profitieren Schmerztherapiepatienten von ihren Mitpatienten? : Eine retrospektive Beobachtungsstudie zum Einfluss des Stadiums der Schmerzbewältigung und der Therapieerfahrung der Mitpatienten auf den individuellen Therapieerfolg in einer stationären interdisziplinären multimodalen Schmerztherapie (IMST).

BACKGROUND: Interdisciplinary multimodal pain therapy (IMPT) is mostly run in a group setting to encourage the exchange of experiences between patients and thus facilitate the change of pain-related attitudes and behavior. As is known from psychotherapy research, the fellow patients in a therapy group have a relevant influence on the success of the therapy for the individual patient. OBJECTIVE: We examined the extent to which therapy success in an IMST group is influenced by individual co-patient characteristics, such as cognitive behavioral pain management, the difference to their own pain management and the proportion of co-patients who repeat therapy. METHOD: In a retrospectively planned investigation of the psychometric tests of all patients in an inpatient IMST between January 2013 and February 2020, the influence of fellow patient characteristics on clinically relevant changes with respect to various parameters of the severity of chronic pain disorders was analyzed using binary logistic regression analyses. RESULTS: We examined 636 treatment cases of which 540 were first-time stays. On each day of treatment, 5 fellow patients were present, 15% of whom had repeated the therapy. We were able to show that the proportion of fellow patients who repeat the therapy (p < 0.001; odds ratio, OR = 1.032) and the cognitive behavioral pain management of the fellow patients (p < 0.001; OR = 2.885) significantly increase the probability of achieving success in at least one of the parameters examined. An influence of a specific parameter on the success of therapy could not be proven. CONCLUSION: Despite methodological limitations our results suggest that in patient groups of an IMST, patients with therapy experience and those with advanced cognitive behavioral methods for pain management should be combined with novices and patients who are still at the beginning of coping with the chronic pain disorder.

[Palliative aspects in clinical acute and emergency medicine as well as intensive care medicine : Consensus paper of the DGIIN, DGK, DGP, DGHO, DGfN, DGNI, DGG, DGAI, DGINA and DGPalliativmedizin]. / Palliativmedizinische Aspekte in der klinischen Akut- und Notfallmedizin sowie Intensivmedizin : Konsensuspapier der DGIIN, DGK, DGP, DGHO, DGfN, DGNI, DGG, DGAI, DGINA und DGPalliativmedizin.

The timely integration of palliative medicine is an important component in the treatment of various advanced diseases. While a German S­3-guideline on palliative medicine exists for patients with incurable cancer, a recommendation for non-oncological patients and especially for palliative patients presenting in the emergency department or intensive care unit is missing to date. Based on the present consensus paper, the palliative care aspects of the respective medical disciplines are addressed. The timely integration of palliative care aims to improve quality of life and symptom control in clinical acute and emergency medicine as well as intensive care.

[Palliative aspects in clinical acute and emergency medicine as well as intensive care medicine : Consensus paper of the DGIIN, DGK, DGP, DGHO, DGfN, DGNI, DGG, DGAI, DGINA and DGPalliativmedizin]. / Palliativmedizinische Aspekte in der klinischen Akut- und Notfallmedizin sowie Intensivmedizin : Konsensuspapier der DGIIN, DGK, DGP, DGHO, DGfN, DGNI, DGG, DGAI, DGINA und DGPalliativmedizin.

The timely integration of palliative medicine is an important component in the treatment of various advanced diseases. While a German S­3-guideline on palliative medicine exists for patients with incurable cancer, a recommendation for non-oncological patients and especially for palliative patients presenting in the emergency department or intensive care unit is missing to date. Based on the present consensus paper, the palliative care aspects of the respective medical disciplines are addressed. The timely integration of palliative care aims to improve quality of life and symptom control in clinical acute and emergency medicine as well as intensive care.

[Palliative aspects in clinical acute and emergency medicine as well as intensive care medicine: consensus paper of the DGIIN, DGK, DGP, DGHO, DGfN, DGNI, DGG, DGAI, DGINA and DGPalliativmedizin]. / Palliativmedizinische Aspekte in der klinischen Akut- und Notfallmedizin sowie Intensivmedizin: Konsensuspapier der DGIIN, DGK, DGP, DGHO, DGfN, DGNI, DGG, DGAI, DGINA und DGPalliativmedizin.

The timely integration of palliative medicine is an important component in the treatment of various advanced diseases. While a German S-3-guideline on palliative medicine exists for patients with incurable cancer, a recommendation for non-oncological patients and especially for palliative patients being treated in the emergency department or intensive care unit is missing to date. Based on the present consensus paper, the palliative care aspects of the respective medical disciplines are addressed. The timely integration of palliative care aims to improve quality of life and symptom control in clinical acute and emergency medicine as well as intensive care.

[Palliative aspects in clinical acute and emergency medicine as well as intensive care medicine : Consensus paper of the DGIIN, DGK, DGP, DGHO, DGfN, DGNI, DGG, DGAI, DGINA and DG Palliativmedizin]. / Palliativmedizinische Aspekte in der klinischen Akut- und Notfallmedizin sowie Intensivmedizin : Konsensuspapier der DGIIN, DGK, DGP, DGHO, DGfN, DGNI, DGG, DGAI, DGINA und DG Palliativmedizin.

The integration of palliative medicine is an important component in the treatment of various advanced diseases. While a German S3 guideline on palliative medicine exists for patients with incurable cancer, a recommendation for non-oncological patients and especially for palliative patients presenting in the emergency department or intensive care unit is missing to date. Based on the present consensus paper, the palliative care aspects of the respective medical disciplines are addressed. The timely integration of palliative care aims to improve quality of life and symptom control in clinical acute and emergency medicine as well as intensive care.

[Basic Knowledge of Hygiene in Voluntary Disaster Control Using - German Red Cross in the Rhein-Erft District as an Example]. / Hygienisches Grundwissen im ehrenamtlichen Katastrophenschutz ­Am Beispiel des Deutschen Roten Kreuzes im Rhein-Erft-Kreis .

Full-time workers in the rescue service are often exposed to a risk of infection. The volunteers of the German disaster control (Katastrophenschutz; KatS) are exposed to a similar risk of infection when they are deployed. The aim of this study was to investigate the hygiene status of the two operational units of the German Red Cross (Deutsches Rotes Kreuz; DRK) in the Rhein-Erft District (Rhein-Erft-Kreis; REK). The 66 volunteers of the two operational units (Einsatzeinheiten; EE) "NRW BM 05" and "NRW BM 02" were assessed by means of a written questionnaire. The results showed that they had good general knowledge of hygiene.There were, however, deficits in the knowledge of specific diseases and some multi-resistant pathogens. In general, perceived risk varied greatly, and was often above 5 on a scale from 1-10, where "1" stands for no perceived risk and "10" for high perceived risk. Thus, there is a certain "concern" about getting an infection in action. Appropriate training courses are needed to optimize this situation in the future.

[Perceptions on handling of opioids: focus COVID-19 : A survey among anesthesiologists via the specialist societies DGAI/BDA]. / Wahrnehmungen zum Umgang mit Opioiden: Fokus COVID-19 : Eine Umfrage unter Anästhesist:innen über die Fachgesellschaften DGAI/BDA.

BACKGROUND: Opioids are part of the daily routine in anesthesiology and palliative care; however, treatment of dyspnea with opioids is presented heterogeneously in guidelines. This may result in an uncertainty concerning opioid indications and ethical concerns, especially when caring for COVID-19 patients. OBJECTIVE: We aimed to examine the perception of anesthesiologists concerning the handling of morphine as the reference opioid (subsequently termed M/O) for symptom control within and outside of a palliative care setting, including care for COVID-19 patients. MATERIAL AND METHODS: Members of the German Society of Anesthesiology and Intensive Care Medicine (DGAI) and the Professional Association of German Anesthesiologists (BDA) received an anonymized online questionnaire (Survey Monkey®; Momentive Inc., San Mateo, CA, USA) in October 2020, containing questions regarding their perception of symptom management with M/O in general, and in particular concerning COVID-19 patients. Participants were asked to rate their perception within and outside a palliative care setting. RESULTS AND DISCUSSION: A total of 1365 anesthesiologists participated; 46% women. Most anesthesiologists were 41-60 years old (58%), worked in a hospital setting (78%), in the operating theatre (63%) and in intensive care units (49%). The majority (57%) reported > 20 years of professional experience (52%) and partial involvement in palliative care (57%). Perception of M/O handling was mostly "certain and confident" (88%) and "clearly regulated" (85%) within a palliative care setting but rated substantially lower for outside palliative care (77%/63%). When caring for COVID-19 patients, handling of M/O was even less often rated "certain and confident" (40%) or "clearly regulated" (29%) outside palliative care. Dyspnea (95%/75%), relief of the dying process (84%/51%), agitation (59%/27%) and anxiety/panic (61%/33%) were more frequently rated as general indications for morphine within versus outside palliative care. The majority of anesthesiologists disputed that M/O is given with the intention to hasten death within (87%) and outside (93%) palliative care. Highest difference in route of administration was reported for the subcutaneous administration of M/O within (76%) versus outside (33%) palliative care, followed by the intravenous route (57%/79%), while oral (66/62%) and transdermal (48%/39%) administration were reported to be used comparatively frequently. Most participants (85%) wanted more frequent involvement of palliative care consultation teams but also more team conferences (75%), supervision (72%), and training on opioid management (69%). CONCLUSION: Anesthesiologists perceived considerable uncertainty in using M/O for nonpalliative care medical settings. Highest uncertainty was seen for the care of patients with COVID-19. The prevalent use of the subcutaneous route for M/O application in palliative care can serve as inspiration for areas outside palliative care as well. Uniform interdisciplinary guidelines for symptom control including dyspnea, education and involvement of a palliative care consultation team should be more considered in the future.

[Self-hypnosis training for in-hospital chronic pain patients : A retrolective observational study]. / "Selbsthypnosetraining" bei chronischen stationären Schmerzpatienten : Eine retrolektive Beobachtungsstudie.

BACKGROUND: Hypnosis is probably one of the oldest therapies known to man. In the last decades modern hypnosis has mainly been used by psychotherapists; however, hypnosis is becoming increasingly more important as a therapeutic method in medicine. Hypnosis can be used for a variety of medical indications. In the literature there is much evidence for the effectiveness of hypnosis. The aim of the present investigation was to demonstrate the effectiveness of hypnosis in inpatient treatment of chronic pain patients and to present a self-hypnosis program, which can be easily integrated into pain therapy. METHODS: From October 2012 to April 2013 all inpatient chronic pain patients were included (group 1: non-hypnosis group, group 2: hypnosis group). Concerning group 2 a standardized protocol for hypnotherapy was integrated in addition to the standardized pain management program. The main goal of hypnotherapy was to integrate a self-hypnosis training so that further implementation in a domestic setting could be guaranteed. By means of standardized test procedures, e. g. Patient Health Questionnaire (PHQ-9), Pain Disability Index (PDI), Generalized Anxiety Disorder (GAD-7) and Numerical Rating Scales (NRS) for pain and general well-being, data were evaluated before and after the pain therapy. RESULTS: The prestandardized and poststandardized test procedures of 30 chronic pain patients were evaluated (17 patients without hypnosis, 13 patients with hypnosis). The main diagnosis according to ICD-10 was "chronic pain disorder" (F45.41) with a MPSS stage III in all patients. The PDI was significantly improved in the hypnosis group (p = 0.019). The other items all showed a trend towards improvement in the hypnosis group (exception GAD-7) but without statistical significance (p > 0.05). DISCUSSION: In a small patient collective, the present investigation was able to show that the integration of modern hypnotherapy into the treatment of chronic pain patients in an inpatient setting can be another useful therapeutic aspect. In particular, the instructions for learning independently seem to be useful due to the limited in-patient time. More research needs to be carried out to support our initial findings.

Is Every Life Worth Saving: Does Religion and Religious Beliefs Influence Paramedic's End-of-Life Decision-making? A Prospective Questionnaire-based Investigation.

BACKGROUND: Paramedics, arriving on emergency cases first, have to make end-of-life decisions almost on a daily basis. Faith shapes attitudes toward the meaning and worth of life itself and therefore influences decision-making. OBJECTIVE: The objective of this study was to detect whether or not religious and spiritual beliefs influence paramedics in their workday life concerning end-of-life decisions, and whether it is legally possible for them to act according to their conscience. METHODS AND DESIGN: This is a literature review of prior surveys on the topic using five key words and questionnaire-based investigation using a self-administered online survey instrument. SETTINGS/PARTICIPANTS: Paramedics all over Germany were given the opportunity to participate in this online questionnaire-based study. MEASUREMENTS: Two databases were searched for prior studies for literature review. Participants were asked about their religiosity, how it affects their work, especially in end-of-life situations, how experienced they are, and whether or not they have any legal latitude to withhold resuscitation. RESULTS: A total of 429 paramedics answered the questionnaire. Religious paramedics would rather hospitalize a patient holding an advance directive than leave him/her at home (P = 0.036) and think death is less a part of life than the nonreligious (P = 0.001). Otherwise, the Spearman's rho correlation was statistically insignificant for all tests regarding resuscitation. CONCLUSIONS: The paramedic's religiosity is not the prime factor in his/her decision-making regarding resuscitation.

Determinants of completion of advance directives: a cross-sectional comparison of 649 outpatients from private practices versus 2158 outpatients from a university clinic.

OBJECTIVES: To compare outpatients from private practices and outpatients from a university clinic regarding the determinants of completion of advance directives (AD) in order to generalise results of studies from one setting to the other. Five determinants of completion of AD were studied: familiarity with AD, source of information about AD, prior experiences with own life-threatening diseases or family members in need of care and motives in favour and against completion of AD. DESIGN: Observational cross-sectional study. SETTING: Private practices and a university clinic in Germany in 2012. PARTICIPANTS: 649 outpatients from private practices and 2158 outpatients from 10 departments of a university clinic. OUTCOME MEASURES: Completion of AD, familiarity with AD, sources of information about AD (consultation), prior experiences (with own life-threatening disease and family members in need of care), motives in favour of or against completion of AD, sociodemographic data. RESULTS: Determinants of completion of AD did not differ between outpatients from private practices versus university clinic outpatients. Prior experience with severe disease led to a significantly higher rate of completion of AD (33%/36% with vs 24%/24% without prior experience). Participants with completion of AD had more often received legal than medical consultation before completion, but participants without completion of AD are rather aiming for medical consultation. The motives in favour of or against completion of AD indicated inconsistent patterns. CONCLUSIONS: Determinants of completion of AD are comparable in outpatients from private practices and outpatients from a university clinic. Generalisations from university clinic samples towards a broader context thus seem to be legitimate. Only one-third of patients with prior experience with own life-threatening diseases or family members in need of care had completed an AD as expression of their autonomous volition. The participants' motives for or against completion of AD indicate that ADs are considered a kind of 'negative autonomy' as instruments to prevent particular forms of therapy. Interactive, repeated and situation-based AD discussions might reach a higher percentage of patients and concurrently enable personal volitions and thereby strengthen individual 'positive autonomy'.

Effects of Lidocaine on HT-29 and SW480 Colon Cancer Cells In Vitro.

BACKGROUND: Evidence is growing that the risk of cancer dissemination may be enhanced during the perioperative period. Whether particular anesthetic techniques influence oncological outcome is still under discussion. For pain management, lidocaine can be administered perioperatively by intravenous, intraperitoneal or epidural infusion. Here we investigated the effect of lidocaine on colon carcinoma cell lines (HT-29 and SW480) in vitro. MATERIALS AND METHODS: ELISA BrdU (Roche) for cell proliferation and FITC Annexin V detection kit (BD Pharming) for apoptosis analysis were applied. Cell-cycle profiles were investigated by flow cytometry. RESULTS: Cell-cycle arrest was induced in both cell lines by 1000 µM lidocaine, while no inhibition of cell proliferation was detected. Apoptosis decreased in SW480 but not in HT-29 cells. CONCLUSION: Lidocaine induces cell-cycle arrest in both colon carcinoma cell lines in vitro. The effective drug concentration can be obtained by local infiltration.

Palliative patients under anaesthesiological care: a single-centre retrospective study on incidence, demographics and outcome.

BACKGROUND: While anesthesiologist's involvement in palliative care has been widely researched, extensive data on palliative patients under anesthesiological care in the operating room is missing. This study was performed to assess the incidence, demographics, and outcome of palliative patients under anesthesiological care. METHODS: We conducted a single-center retrospective chart review of all palliative patients under anesthesiological care at a university hospital in 1 year. Patients were classified as palliative if they fulfilled all predefined criteria (a) incurable, life-threatening disease, (b) progression of the disease despite therapy, (c) advanced stage of the disease with limited life-expectancy, (d) receiving or being in need of a specific palliative therapy. Demographics, periprocedural parameters, symptoms at evaluation, and outcome were determined using different medical records. RESULTS: Of 17,580 patients examined, 276 could be classified as palliative patients (1.57%). Most contacts with palliative patients occurred in the operating room (68.5%). In comparison to the non-palliative patients, procedures in palliative patients were significantly more often urgent or emergency procedures (39.1% vs. 27.1%., P < 0.001), and hospital mortality was higher (18.8% vs. 5.0%, P < 0.001). Preprocedural symptoms varied, with pain, gastrointestinal, and nutritional problems being the most prevalent. CONCLUSIONS: Palliative patients are treated by anesthesiologists under varying circumstances. Anesthesiologists need to identify these patients and need to be aware of their characteristics to adequately attend to them during the periprocedural period.

The expenditure of computer-related worktime using clinical decision support systems in chronic pain therapy.

BACKGROUND: Estimate the expenditure of computer-related worktime resulting from the use of clinical decision support systems (CDSS) to prevent adverse drug reactions (ADR) among patients undergoing chronic pain therapy and compare the employed check systems with respect to performance and practicability. METHODS: Data were collected retrospectively from 113 medical records of patients under chronic pain therapy during 2012/2013. Patient-specific medications were checked for potential drug-drug interactions (DDI) using two publicly available CDSS, Apotheken Umschau (AU) and Medscape (MS), and a commercially available CDSS AiDKlinik® (AID). The time needed to analyze patient pharmacotherapy for DDIs was taken with a stopwatch. Measurements included the time needed for running the analysis and printing the results. CDSS were compared with respect to the expenditure of time and usability. Only patient pharmacotherapies with at least two prescribed drugs and fitting the criteria of the corresponding CDSS were analyzed. Additionally, a qualitative evaluation of the used check systems was performed, employing a questionnaire asking five pain physicians to compare and rate the performance and practicability of the three CDSSs. RESULTS: The AU tool took a total of 3:55:45 h with an average of 0:02:32 h for 93 analyzed patient regimens and led to the discovery of 261 DDIs. Using the Medscape interaction checker required a total of 1:28:35 h for 38 patients with an average of 0:01:58 h and a yield of 178 interactions. The CDSS AID required a total of 3:12:27 h for 97 patients with an average time of analysis of 0:01:59 h and the discovery of 170 DDIs. According to the pain physicians the CDSS AID was chosen as the preferred tool. CONCLUSIONS: Applying a CDSS to examine a patients drug regimen for potential DDIs causes an average extra expenditure of work time of 2:09 min, which extends patient treatment time by 25 % on average. Nevertheless, the authors believe that the extra expenditure of time employing a CDSS is outweighed by their benefits, including reduced ADR risks and safer clinical drug management.

Effects of ketamine, s-ketamine, and MK 801 on proliferation, apoptosis, and necrosis in pancreatic cancer cells.

BACKGROUND: Adenocarcinoma of the pancreas is one of the most aggressive cancer diseases affecting the human body. The oncogenic potential of this type of cancer is mainly characterized by its extreme growth rate triggered by the activation of signaling cascades. Modern oncological treatment strategies aim at efficiently modulating specific signaling and transcriptional pathways. Recently, anti-tumoral potential has been proven for several substances that are not primarily used in cancer treatment. In some tumor entities, for example, administration of glutamate antagonists inhibits cell proliferation, cell cycle arrest, and finally cell death. To attain endogenic proof of NMDA receptor type expression in the pancreatic cancer cell lines PaTu8988t and Panc-1 and to investigate the impact of ketamine, s-ketamine, and the NMDA receptor antagonist MK 801 on proliferation, apoptosis, and necrosis in pancreatic carcinoma. METHODS: Cell proliferation was measured by means of the ELISA BrdU assay, and the apoptosis rate was analyzed by annexin V staining. Immunoblotting were also used. RESULTS: The NMDA receptor type R2a was expressed in both pancreatic carcinoma cell lines. Furthermore, ketamine, s-ketamine, and MK 801 significantly inhibited proliferation and apoptosis. CONCLUSIONS: In this study, we showed the expression of the NMDA receptor type R2a in pancreatic cancer cells. The NMDA antagonists ketamine, s-ketamine, and MK 801 inhibited cell proliferation and cell death. Further clinical studies are warranted to identify the impact of these agents on the treatment of cancer patients.

Genetic Polymorphisms in Endothelin-1 as Predictors for Long-Term Survival and the Cardiac Index in Patients Undergoing On-Pump Cardiac Surgery.

Genetic variants within the endothelin-1 gene (EDN1) have been associated with several cardiovascular diseases and may act as genetic prognostic markers. Here, we explored the overall relevance of EDN1 polymorphisms for long-term survival in patients undergoing on-pump cardiac surgery. A prospectively collected cohort of 455 Caucasian patients who underwent cardiac surgery with cardiopulmonary bypass was followed up for 5 years. The obtained genotypes and inferred haplotypes were analyzed for their associations with the five-year mortality rate (primary endpoint). The EDN1 T-1370G and K198N genotype distributions did not deviate from Hardy-Weinberg equilibrium and the major allele frequencies were 83% and 77%, respectively. The cardiovascular risk factors were equally distributed in terms of the different genotypes and haplotypes associated with the two polymorphisms. The five-year mortality rate did not differ among the different EDN1 T-1370G and K198N genotypes and haplotypes. Haplotype analysis revealed that carriers of the G-T (compound EDN1 T-1370G G/K198N T) haplotype had a higher cardiac index than did non-carriers (p = 0.0008); however, this difference did not reach significance after adjusting for multiple testing. The results indicate that common variations in EDN1 do not act as prognostic markers for long-term survival in patients undergoing on-pump cardiac surgery.

The possible impact of the German DRGs reimbursement system on end-of-life decision making in a surgical intensive care unit.

BACKGROUND: More than 70 % of critically ill patients die in intensive care units (ICUs) after treatment is reduced. End-of-life decision making in the ICU is a grey area that varies in practice, and there are potential economic consequences of over- and under-treatment. The aim of this study was to describe the end-of-life decisions of critically ill patients in a surgical ICU in Germany and to identify how financial incentives may influence decision making. METHODS: Data on the admission diagnosis, end-of-life decision making and cause of death were obtained for 69 critically ill patients who died in the ICU (Hospital of Bayreuth, Germany) in 2009. A cost-revenue analysis was conducted on the 46 patients who did not die within 3 days of ICU admission. Because we lacked real data on costs, our analysis was based on the average cost for each diagnosis-related group (DRG) from the Institute for the Hospital Remuneration System (InEK). Hospital revenues based on the DRG were considered. Subsequently, we compared the estimated financial impact of earlier and later decisions to withdraw or withhold futile therapy. RESULTS: In this study, we found that end-of-life decision making was poorly documented. Only 11 % of patients had a valid power of attorney and advanced directives, and therapy with presumed consent was performed in 43 % of all cases. From long-stay patients, therapy was withdrawn for 37 % of patients and withheld from 26 % of patients, and 37 % of the patients died receiving maximal therapy. Almost 72 % of DRG-related reimbursements were dependent on ventilation hours. The average total cost estimate (according to InEK) for the 46 long-stay patients was 1,201,000 . The revenues without additional remuneration were 1,358,000 , and the total estimated profit was approximately 157,000 . Only 10 cases were assumed to be non-profitable. In cases where the decision to withdraw or withhold therapy could have occurred 3 days earlier, the estimated profit shrank to 72,000 (46 % of estimated ICU profit). In situations where the decision to withdraw or withhold therapy from patients could have occurred 3 days later, the hypothetical profit rose to 217,000 (138 % of estimated ICU profit). CONCLUSION: There are still few patients with clear self-determination, and almost half of therapies are performed only according to presumed consent. The strong nonlinear dependence of DRG revenues on ventilation hours could influence ethical decision making of medical professionals. The decision-making process and appropriate therapy in the ICU setting need to be defined more clearly and better documented, focusing on the benefits to the patient while respecting patient consent.

Ketamine in outpatient arthroscopic shoulder surgery: Effects on postoperative pain, hemodynamic stability and process times.

BACKGROUND: Pain after arthroscopic shoulder surgery is often severe, and establishing a pain treatment regimen that does not delay discharge can be challenging. The reported ability of ketamine to prevent opioid-induced hyperalgesia has not been investigated in this particular setting. METHODS: 300 adult patients scheduled for shoulder arthroscopy under general anesthesia were recruited for this observational clinical trial and were allotted to either receive 1mg/kg IV bolus of ketamine before surgery (ketamine group, KG) or to a control group (CG) without ketamine. NRS pain scores were obtained on the operative day and on postoperative days 1 and 2 and compared between groups. Secondary variables were blood pressure, heart rate, process times, satisfaction with the anesthetic and unwanted effects. RESULTS: Pain severity did not differ significantly between the groups at any time. Propofol injection rate and cumulative dose were higher in the KG. Heart rates and blood pressures were similar. Time to emergence and time in PACU were longer and vomiting was more frequent in patients given ketamine. CONCLUSION: Preoperative low-dose ketamine added to a general anesthetic does not reduce perioperative pain after outpatient shoulder arthroscopy. It increases procedural times and the incidence of PONV.