Respiratory complications after major surgery:

Use of thoracic fluid content for prediction of fluid balance and postoperative pulmonary complications after major abdominal surgery: an observational study

BACKGROUND AND OBJECTIVES

The harmful effects of excess fluids frequently manifest in the lungs. Thoracic fluid content (TFC) is a variable provided by the STARLINGTM bioreactance monitor, which represents the total volume of fluid in the chest. The objective is to analyse the association between the variation in TFC values (TFCd0%) at 24 h postoperatively, postoperative fluid balance, and postoperative pulmonary complications.

MATERIAL AND METHODS

Prospective and analytical observational study. Patients scheduled for major abdominal surgery at a tertiary teaching hospital were included. They were monitored during the intervention and the first 24 postoperative hours with the monitor. STARLINGTM, measuring TFC and its variation in different stages of the perioperative period. Serial lung ultrasounds were performed and postoperative pulmonary complications were recorded. Logistic regression was performed to predict the occurrence of atelectasis and pulmonary congestion. The Pearson correlation coefficient was calculated to verify the association between TFC and fluid balance.

RESULTS

50 patients were analyzed. TFCd0% measured on the morning of the first postoperative day increased by a median of 27.1% [IQR: 20.3-37.5] and was correlated at r = 0.44 with the postoperative balance of 677 ml [IQR: 125.5-1,412]. Increased TFC was related to a higher risk of atelectasis (OR = 1.24) and pulmonary congestion (OR = 1.3).

CONCLUSIONS

TFCd0% measured 24 h after surgery presents a moderate correlation with postoperative fluid balance. Its increase is a risk factor for the appearance of postoperative pulmonary complications.

Statin Therapy Is Associated With Decreased 90-Day Postoperative Mortality After Colon Cancer Surgery

BACKGROUND

There have been conflicting reports regarding a protective effect of statin therapy after colon cancer surgery.

OBJECTIVE

This study aimed to evaluate the association between statin therapy and the postoperative mortality following elective colon cancer surgery.

DESIGN

This population-based cohort study is a retrospective analysis of prospectively collected data from the Swedish Colorectal Cancer Register.

SETTINGS

Patient inclusion was achieved through a nationwide register.

PATIENTS

All adult patients undergoing elective surgery for colon cancer between January 2007 and September 2016 were included in the study. Patients who had received and collected a prescription for statins pre- and postoperatively were allocated to the statin-positive cohort.

MAIN OUTCOME MEASURES

The primary and secondary outcomes of interest were 90-day all-cause mortality and 90-day cause-specific mortality.

RESULTS

A total of 22,337 patients underwent elective surgery for colon cancer during the study period, of whom 6,494 (29%) were classified as statin users. Statin users displayed a significant survival benefit despite being older, having a higher comorbidity burden, and being less fit for surgery. Multivariate analysis illustrated significant reductions in the incidence risk for 90-day all-cause mortality (Incidence Rate Ratio = 0.12, p < 0.001) as well as 90-day cause-specific deaths due to sepsis, due to multiorgan failure, or resulting from a cardiovascular and respiratory origin.

LIMITATIONS

The limitations of this study include its observational retrospective design, restricting the ability to perform standardized follow-up of statin therapy. Confounding from other uncontrolled variables cannot be excluded.

CONCLUSIONS

Statin users had a significant postoperative benefit regarding short-term mortality following elective colon cancer surgery in the current study; however, further research is needed to ascertain whether this relationship is causal. See Video Abstract at http://links.lww.com/DCR/B738.

LA TERAPIA CON ESTATINAS SE ASOCIA CON UNA DISMINUCIN DE LA MORTALIDAD POSOPERATORIA A LOS DAS DESPUS DE LA CIRUGA DE CNCER DE COLON

ANTECEDENTES:Ha habido informes contradictorios con respecto al efecto protector de la terapia con estatinas después de la cirugía de cáncer de colon.OBJETIVO:Este estudio tuvo como objetivo evaluar la asociación entre la terapia con estatinas y la mortalidad postoperatoria después de la cirugía electiva por cáncer de colon.DISEÑO:Este estudio de cohorte poblacional es un análisis retrospectivo de datos recopilados prospectivamente del Registro Sueco de Cáncer Colorrectal.AJUSTES:La inclusión de pacientes se logró mediante la inclusión a través de un registro a nivel nacional.PACIENTES:Se incluyeron en el estudio todos los pacientes adultos sometidos a cirugía electiva por cáncer de colon en el período de enero de 2007 y septiembre de 2016. Los pacientes que habían recibido y recogido una receta de estatinas antes y después de la operación fueron asignados a la cohorte positiva de estatinas.PRINCIPALES MEDIDAS DE DESENLACES:Los desenlaces primarios y secundarios de interés fueron la mortalidad por cualquier causa a los 90 días y la mortalidad por causas específicas a los 90 días.RESULTADOS:Un total de 22.337 pacientes se sometieron a cirugía electiva por cáncer de colon durante el período de estudio, de los cuales 6.494 (29%) se clasificaron como usuarios de estatinas. Los usuarios de estatinas mostraron un beneficio significativo en la supervivencia a pesar de ser mayores, de tener una mayor carga de comorbilidad y de estar menos acondicionado para la cirugía. El análisis multivariado ilustró reducciones significativas en el riesgo de incidencia de mortalidad por cualquier causa a 90 días (índice de tasa de incidencia = 0,12, p < 0,001), así como muertes específicas ena 90 días debidas a sepsis, falla multiorgánica o dea enfermedades de origen cardiovascular y respiratorio.LIMITACIONES:Las limitaciones de este estudio incluyen su diseño observacional retrospectivo, que restringe la capacidad de realizar un seguimiento estandarizado de la terapia con estatinas. No se puede excluir confusión a partir de otras variables no controladas.CONCLUSIONES:Los usuarios de estatinas tuvieron un beneficio posoperatorio significativo con respecto a la mortalidad a corto plazo después de cirugía electiva por cáncer de colon en el estudio actual, sin embargo, se necesita más investigación para confirmar si eexiste una relación es causal. Consulte Video Resumen en http://links.lww.com/DCR/B738.

Do ARISCAT scores help to predict the incidence of postoperative pulmonary complications in elderly patients after upper abdominal surgery? An observational study at a single university hospital

Background

The incidence of postoperative pulmonary complications (PPCs) is increasing in line with the rise in the number of surgical procedures performed on geriatric patients. In this study, we determined the incidence and risk factors of PPCs in elderly Thai patients who underwent upper abdominal procedures, and we investigated whether the Assess Respiratory Risk in Surgical Patients in Catalonia (ARISCAT) score helps to predict PPCs in Thais.

Methods

A retrospective study was conducted on upper abdominal surgical patients aged over 65 years who had been admitted to the surgical ward of Siriraj Hospital, Mahidol University, Thailand, between January 2016 and December 2019. Data were collected on significant PPCs using the European Perioperative Clinical Outcome definitions. To identify risk factors, evaluations were made of the relationships between the PPCs and various preoperative, intraoperative, and postoperative factors, including ARISCAT scores.

Results

In all, 1100 elderly postoperative patients were analyzed. Their mean age was 73.6 years, and 48.5% were male. Nearly half of their operations were laparoscopic cholecystectomies. The incidence of PPCs was 7.7%, with the most common being pleural effusion, atelectasis, and pneumonia. The factors associated with PPCs were preoperative oxygen saturation less than 96% (OR = 2.6, 1.2–5.5), albumin level below 3.5 g/dL (OR = 1.7, 1.0–2.8), duration of surgery exceeding 3 h (OR = 2.0, 1.0–4.2), and emergency surgery (OR = 2.8, 1.4–5.8). There was a relationship between ARISCAT score and PPC incidence, with a correlation coefficient of 0.226 (P < 0.001). The area under the curve was 0.72 (95% CI, 0.665–0.774; P < 0.001).

Conclusions

PPCs are common in elderly patients. They are associated with increased levels of postoperative morbidities and extended ICU and hospital stays. Using the ARISCAT score as an assessment tool facilitates the classification of Thai patients into PPC risk groups. The ARISCAT scoring system might be able to be similarly applied in other Southeast Asian countries.

The Effects of Manual Lung Hyperinflation on Pulmonary Function after Weaning from Mechanical Ventilation among Patients with Abdominal Surgeries: Randomized Clinical Trial

Introduction: After abdominal surgery, the patients who are separated from mechanical ventilation and provided with oxygen therapy via a T-piece are at risk for respiratory complications. Therefore, they need additional respiratory support. This study aimed to evaluate the effects of manual hyperinflation (MHI) on pulmonary function after weaning. Methods: This randomized clinical trial included 40 patients who had undergone abdominal surgery and were receiving oxygen via a T-piece. Patients were selected from the intensive care units (ICU) of two hospitals in Mashhad, Iran. The subjects were randomly allocated to intervention (MHI) and control groups. Patients in the MHI group were provided with three 20-minute MHI rounds using the Mapleson C, while the control group received routine cares. Tidal volume (Vt), Rapid Shallow Breathing Index (RSBI), and the ratio of arterial oxygen partial pressure to fractional inspired oxygen (P/F ratio) were measured before the intervention, as well as 5 and 20 minutes after the intervention. Atelectasis prevalence was assessed before and 24 hours after the intervention. Data were analysed by SPSS software version 13. Results: At baseline, there were no significant differences between the groups regarding Vt, RSBI, P/F ratio, and atelectasis rate. No significant difference was also found between the groups regarding atelectasis rate 24 hours after the intervention. However, at both posttests, Vt, RSBI, and P/F ratio in the MHI group were significantly better than the control group. Conclusion: In patients with artificial airway and spontaneous breathing, MHI improves pulmonary function.

The Association Between Revised Cardiac Risk Index and Postoperative Mortality Following Elective Colon Cancer Surgery: A Retrospective Nationwide Cohort Study

INTRODUCTION

Despite improvements in the perioperative care during the last decades for oncologic colon resection, there is still a substantial risk for postoperative complications and mortality. Opportunities exist for improvement in preoperative risk stratification in this patient population. We hypothesize that the Revised Cardiac Risk Index, a user-friendly tool, could better identify patients with high postoperative mortality risks.

METHODS

A retrospective analysis of operated patients between the years 2007 and 2017 was undertaken, using the prospectively recorded Swedish Colorectal Cancer Registry, which has a 99.5% national coverage for all cases of colon cancer. Patients were cross-referenced with the Swedish National Board of Health and Welfare dataset, a government registry of mortality and comorbidity data. Revised Cardiac Risk Index (RCRI) scores were calculated for each patient and stratified into four groups (RCRI 1, 2, 3, ⩾ 4). A Poisson regression model with robust standard errors of variance was employed to correlate the 90-day postoperative survival with each level of the Revised Cardiac Risk Index.

RESULTS

A total of 24,198 patients met the study inclusion criteria. 90-day postoperative mortality increased from 2.4% in patients with RCRI 1 to 10.1% in patients with RCRI ⩾ 4 (p < 0.001). Adjusted 90-day postoperative mortality increased linearly with an increasing RCRI, where an RCRI of 2, 3, and ≥ 4 respectively led to a 46%, 80%, and 167% increased risk of mortality compared to RCRI 1 (p < 0.001).

CONCLUSIONS

A strong association between an increasing Revised Cardiac Risk Index score and increased 90-day postoperative mortality risk was detected. The Revised Cardiac Risk Index may facilitate risk stratification of patients undergoing elective colon cancer surgery.

Statin Use and Long-Term Mortality after Rectal Cancer Surgery

BACKGROUND

The current study aimed to assess the association between regular statin therapy and postoperative long-term all-cause and cancer-specific mortality following curative surgery for rectal cancer. The hypothesis was that statin exposure would be associated with better survival.

METHODS

Patients with stage I-III rectal cancer undergoing surgical resection with curative intent were extracted from the nationwide, prospectively collected, Swedish Colorectal Cancer Register (SCRCR) for the period from January 2007 and October 2016. Patients were defined as having ongoing statin therapy if they had filled a statin prescription within 12 months before and after surgery. Cox proportional hazards models were employed to investigate the association between statin use and postoperative five-year all-cause and cancer-specific mortality.

RESULTS

The cohort consisted of 10,743 patients who underwent a surgical resection with curative intent for rectal cancer. Twenty-six percent (n = 2797) were classified as having ongoing statin therapy. Statin users had a considerably decreased risk of all-cause (adjusted hazard ratio (HR) 0.66, 95% confidence interval (CI): 0.60-0.73, p < 0.001) and cancer-specific (adjusted HR 0.60, 95% CI: 0.47-0.75, p < 0.001) mortality up to five years following surgery.

CONCLUSIONS

Statin use was associated with a lower risk of both all-cause and rectal cancer-specific mortality following curative surgical resections for rectal cancer. The findings should be confirmed in future prospective clinical trials.

Improving the use of the 'COUGH' bundle in Surgical High Dependency Unit, Ninewells Hospital, Dundee

Developing respiratory complications postoperatively is one of the major determinants of longer hospital stay, morbidity, mortality and increased healthcare costs. The incidence of postoperative respiratory complications varies from 1% to 23%. Given that postoperative respiratory complications are relatively common and costly, there have been various studies which look at ways to reduce the risk of these occurring. One such protocol is the ICOUGH bundle which stands for Incentive spirometry, Coughing and deep breathing, Oral care, patient Understanding, Getting out of bed and Head of bed elevation. This has been adapted locally to the Coughing and deep breathing, Oral care, patient Understanding, Getting out of bed and Head of bed elevation (COUGH) bundle which consists of these components excluding incentive spirometry. Within our surgical high dependency unit (HDU), the COUGH bundle should be implemented in patients who have a moderate or high risk of developing postoperative respiratory complications with an Assess Respiratory Risk in Surgical Patients in Catalonia (ARISCAT) score of 26 or above. Studies have shown that the ICOUGH bundle has reduced rates of pneumonia and unplanned intubation in general surgical and vascular patients. Baseline data taken from surgical HDU showed that the COUGH bundle was not well implemented. One out of eight patients who had an ARISCAT score greater than 26 had the COUGH bundle implemented on admission to the unit. Three out of eight patients had the ARISCAT score documented in their admission medical review. One patient who should have received the bundle, but did not, developed a hospital acquired pneumonia postoperatively. To address this issue, we aimed to increase awareness surrounding the COUGH bundle and to increase the number of patients who had the COUGH bundle started on admission. This quality improvement project had four cycles (plan, do, study, act) and after these, 100% of patients who had an ARISCAT score of 26 or more had the COUGH bundle implemented.

Statin therapy and postoperative short-term mortality after rectal cancer surgery

AIM

This study aimed to assess the correlation between regular statin therapy and postoperative mortality following surgical resection for rectal cancer.

METHOD

This retrospective cohort study included all adult patients undergoing abdominal rectal cancer surgery in Sweden between January 2007 and September 2016. Data were gathered from the Swedish Colorectal Cancer Registry, a large population-based prospectively collected registry. Statin users were defined as patients with one or more collected prescriptions of a statin within 12 months before the date of surgery. The statin-positive and statin-negative cohorts were matched by propensity scores based on baseline demographics.

RESULTS

A total of 11 966 patients underwent surgical resection for rectal cancer, of whom 3019 (25%) were identified as statin users. After applying propensity score matching (1:1), 3017 pairs were available for comparison. In the matched groups, statin users demonstrated reduced 90-day all-cause mortality (0.7% vs. 5.5%, p < 0.001) and also showed significantly reduced cause-specific mortality due to cardiovascular and respiratory events, as well as sepsis and multiorgan failure. The significant postoperative survival benefit of statin users was seen despite a higher rate of cardiovascular comorbidity.

CONCLUSION

Preoperative statin therapy displays a strong association with reduced postoperative mortality following surgical resection for rectal cancer. The results from the current study warrant further investigation to determine whether a causal relationship exists.

Multimorbidity and Critical Care Neurosurgery: Minimizing Major Perioperative Cardiopulmonary Complications

With increasing prevalence of chronic diseases, multimorbid patients have become commonplace in the neurosurgical intensive care unit (neuro-ICU), offering unique management challenges. By reducing physiological reserve and interacting with one another, chronic comorbidities pose a greatly enhanced risk of major postoperative medical complications, especially cardiopulmonary complications, which ultimately exert a negative impact on neurosurgical outcomes. These premises underscore the importance of perioperative optimization, in turn requiring a thorough preoperative risk stratification, a basic understanding of a multimorbid patient’s deranged physiology and a proper appreciation of the potential of surgery, anesthesia and neurocritical care interventions to exacerbate comorbid pathophysiologies. This knowledge enables neurosurgeons, neuroanesthesiologists and neurointensivists to function with a heightened level of vigilance in the care of these high-risk patients and can inform the perioperative neuro-ICU management with individualized strategies able to minimize the risk of untoward outcomes. This review highlights potential pitfalls in the intra- and postoperative neuro-ICU period, describes common preoperative risk stratification tools and discusses tailored perioperative ICU management strategies in multimorbid neurosurgical patients, with a special focus on approaches geared toward the minimization of postoperative cardiopulmonary complications and unplanned reintubation.

Association of preoperative spirometry with cardiopulmonary fitness and postoperative outcomes in surgical patients: A multicentre prospective cohort study

BACKGROUND

Preoperative spirometry and cardiopulmonary exercise testing (CPET) may stratify risk for respiratory complications. This secondary analysis of the Measurement of Exercise Tolerance before Surgery (METS) study examined whether CPET performance (i.e., cardiopulmonary fitness) confounds associations of spirometry with outcomes.

METHODS

The analysis included 1200 participants having major non-cardiac surgery at 25 hospitals in Canada, Australia, New Zealand and UK. Forced expiratory volume in 1 s (FEV₁), and ratio of FEV₁ to forced vital capacity (FVC) were measured during preoperative spirometry, and peak oxygen consumption and ventilatory efficiency during preoperative CPET. Outcomes were respiratory morbidity (Postoperative Morbidity Survey) and pulmonary complications (pneumonia or respiratory failure). We used multivariable logistic regression models to estimate associations of FEV₁ with outcomes after adjustment for risk factors and either peak oxygen consumption or ventilatory efficiency.

FINDINGS

128 participants (11%) developed respiratory morbidity, and 48 (4%) developed pulmonary complications. There was no strong evidence that FEV₁ predicted respiratory morbidity after adjustment for peak oxygen consumption (p = 0·80) or ventilatory efficiency (p = 0·76), or FEV₁ predicted pulmonary complications after adjustment for ventilatory efficiency (p = 0·37). Peak oxygen consumption (odds ratio 0·66 per 5 mL/kg/min increase; 95% CI, 0·54-0·82) was associated with respiratory morbidity. Ventilatory efficiency was associated with respiratory morbidity (p = 0·04) and pulmonary complications (p = 0·02). Peak oxygen consumption also confounded the association between FEV₁ and respiratory morbidity.

INTERPRETATION

After accounting for fitness and clinical factors, FEV₁ was not strongly predictive of respiratory complications. Prior associations between FEV₁ and respiratory morbidity may be explained by confounding by peak oxygen consumption.

FUNDING

Canadian Institutes of Health Research, Heart and Stroke Foundation of Canada, Ontario Ministry of Health and Long-Term Care, Ontario Ministry of Research, Innovation and Science, UK National Institute of Academic Anaesthesia, UK Clinical Research Collaboration, Australian and New Zealand College of Anaesthetists, and Monash University.

To Compare the Changes in Hemodynamic Parameters and Blood Loss during Percutaneous Nephrolithotomy - General Anesthesia versus Subarachnoid Block

Background

Percutaneous nephrolithotomy (PCNL) is done under general anesthesia (GA) in most of the centers. However, associated complications and cost are higher for GA than for regional anesthesia.

Aim

The aim of the study was to compare the efficacy of GA versus subarachnoid block (SAB) with regard to intraoperative blood loss and postoperative drop in hemoglobin (Hb) in patients undergoing PCNL.

Setting and Design

This prospective, randomized, comparative clinical trial was carried out at a tertiary care hospital. After obtaining the institute ethical committee clearance (vide no 57/15), patients were randomly allocated into two groups using table of randomization (n = 30 each), Group A - GA, Group B - SAB.

Materials and Methods

Intraoperative blood loss was assessed by measuring the Hb of irrigated fluid and postoperative drop in Hb concentration. Other parameters such as intraoperative mean arterial pressure and heart rate were also compared in these groups.

Statistical Analysis

The results are presented in frequencies, percentages, and mean ± standard deviation. The Chi-square test was used to compare the categorical variables between the groups. Unpaired t-test was used to compare the continuous variables between the groups.

Results

Hemodynamic parameters were similar in both the groups preoperatively. The Hb drop was significant in Group A (1.28 ± 0.35 g.dl^-1) as compared to Group B (1.10 ± 0.67 g.dl^-1). On calculating Hb in irrigated fluid-blood mixture, it was found to be significantly higher in Group A (1.87 ± 0.44 g.L^-1) as compared to Group B (1.25 ± 0.25 g.L^-1).

Conclusions

Both GA and SAB are effective and safe in PCNL. However, SAB is associated with less blood loss as estimated by intraoperative blood loss and Hb drop.

Obesity associated with increased postoperative pulmonary complications and mortality after trauma laparotomy

Background

Patient-related risk factors for the development of postoperative pulmonary complications (PPCs) include age ≥ 60-years, congestive heart failure, hypoalbuminemia and smoking. The effect of obesity is unclear and has not been shown to independently increase the likelihood of PPCs in trauma patients undergoing trauma laparotomy. We hypothesized the likelihood of mortality and PPCs would increase as body mass index (BMI) increases in trauma patients undergoing trauma laparotomy.

Methods

The Trauma Quality Improvement Program (2010–2016) was queried to identify trauma patients ≥ 18-years-old undergoing trauma laparotomy within 6-h of presentation. A multivariable logistic regression analysis was used to determine the likelihood of PPCs and mortality when stratified by BMI.

Results

From 8,330 patients, 2,810 (33.7%) were overweight (25–29.9 kg/m²), 1444 (17.3%) obese (30–34.9 kg/m²), 580 (7.0%) severely obese (35–39.9 kg/m²), and 401 (4.8%) morbidly obese (≥ 40 kg/m²). After adjusting for covariates including age, injury severity score, chronic obstructive pulmonary disease, smoking, and rib/lung injury, the likelihood of PPCs increased with increasing BMI: overweight (OR = 1.37, CI 1.07–1.74, p = 0.012), obese (OR = 1.44, CI 1.08–1.92, p = 0.014), severely obese (OR = 2.20, CI 1.55–3.14, p < 0.001), morbidly obese (OR = 2.42, CI 1.67–3.51, p < 0.001), compared to those with normal BMI. In addition, the adjusted likelihood of mortality increased for the morbidly obese (OR = 2.60, CI 1.78–3.80, p < 0.001) compared to those with normal BMI.

Conclusion

Obese trauma patients undergoing emergent trauma laparotomy have a high likelihood for both PPCs and mortality, with morbidly obese trauma patients having the highest likelihood for both. This suggests obesity should be accounted for in risk prediction models of trauma patients undergoing laparotomy.

Electronic supplementary material

The online version of this article (10.1007/s00068-020-01329-w) contains supplementary material, which is available to authorized users.

Preoperative Evaluation: Estimation of Pulmonary Risk Including Obstructive Sleep Apnea Impact

One in 4 deaths occurring within a week of surgery are related to pulmonary complications, making it the second most common serious morbidity after cardiovascular events. The most significant predictors of the postoperative pulmonary complications (PPCs) are American Society of Anesthesiologists physical status, advanced age, dependent functional status, surgical site, and duration of surgery. The overall risk of PPCs can be predicted using scores that incorporate readily available clinical data.

Impact of preoperative patient education on the prevention of postoperative complications after major visceral surgery: the cluster randomized controlled PEDUCAT trial

Background

The prevention of postoperative complications is of prime importance after complex elective abdominal operations. Preoperative patient education may prevent postoperative complications and improve patients’ wellbeing, but evidence for its efficacy is poor. The aims of the PEDUCAT trial were (a) to assess the impact of preoperative patient education on postoperative complications and patient-reported outcomes in patients scheduled for elective complex visceral surgery and (b) to evaluate the feasibility of cluster randomization in this setting.

Methods

Adult patients (age ≥ 18 years) scheduled for elective major visceral surgery were randomly assigned in clusters to attend a preoperative education seminar or to the control group receiving the department’s standard care. Outcome measures were the postoperative complications pneumonia, deep vein thrombosis (DVT), pulmonary embolism, burst abdomen, and in-hospital fall, together with patient-reported outcomes (postoperative pain, anxiety and depression, patient satisfaction, quality of life), length of hospital stay (LOS), and postoperative mortality within 30 days after the index operation. Statistical analysis was primarily by intention to treat.

Results

In total 244 patients (60 clusters) were finally included (intervention group 138 patients; control group 106 patients). Allocation of hospital wards instead of individual patients facilitated study conduct and reduced confusion about group assignment. In the intervention and control groups respectively, pneumonia occurred in 7.4% versus 8.3% (p = 0.807), pulmonary embolism in 1.6% versus 1.0% (p = 0.707), burst abdomen in 4.2% versus 1.0% (p = 0.165), and in-hospital falls in 0.0% versus 4.2% of patients (p = 0.024). DVT did not occur in any of the patients. Mortality rates (1.4% versus 1.9%, p = 0.790) and LOS (14.2 (+/− 12.0) days versus 16.1 (+/− 15.0) days, p = 0.285) were also similar in the intervention and control groups.

Conclusions

Cluster randomization was feasible in the setting of preoperative patient education and reduced the risk of contamination effects. The results of this trial indicate good postoperative outcomes in patients undergoing major visceral surgery without superiority of preoperative patient education compared to standard patient care at a high-volume center. However, preoperative patient education is a helpful instrument not only for teaching patients but also for training the nursing staff.

Trial registration

German Clinical Trials Registry, DRKS00004226. Registered on 23 October 2012. Registered 8 days after the first enrollment.

Electronic supplementary material

The online version of this article (10.1186/s13063-018-2676-6) contains supplementary material, which is available to authorized users.

Prophylactic continuous positive airway pressure after pulmonary lobectomy: a randomized controlled trial

Background

Despite advances in perioperative care and surgical techniques, patients undergoing pulmonary lobectomy are still at high risk for postoperative complications. Among interventions expected to reduce complications, continuous positive airway pressure (CPAP) is a discussed option. This trial aims to test the hypothesis whether prophylactic application of CPAP following pulmonary lobectomy can reduce postoperative complications.

Methods

The study was designed as a prospective, randomized, controlled trial. Patients with clinical stage I non-small cell lung cancer scheduled for pulmonary lobectomy were eligible and were trained for the use of CPAP interface. The control group received standard postoperative pain management and physiotherapy; in addition, the study group received CPAP (PEEP 8-12 cmH₂O, 2 hours thrice daily for three days).

Results

After the appropriate selection, 163 patients were considered for the analysis: 82 patients constituted the control group, 81 the study group. The two groups were substantially comparable for preoperative parameters. The rate of postoperative complications was lower in the study group (24.7% vs. 43.9%; P=0.015) as well as the hospital stay (6 vs. 7 days; P=0.031). The stepwise logistic regression model identified: CPAP [odd ratio (OR): 0.3026, CI: 0.1389-0.6591], smoke habits [OR: 2.5835, confidence interval (CI): 1.0331-6.4610] and length of surgery in minutes (OR: 1.0102, CI: 1.0042-1.0163) as regressors on postoperative complications.

Conclusions

The present trial demonstrated that prophylactic application of CPAP during the postoperative period after pulmonary lobectomy for stage I non-small cell lung cancer was effective in prevent postoperative complications.

Postoperative pain management practices and their effectiveness after major gynecological surgery: An observational study in a tertiary care hospital

Background and Aims:

Despite advances in postoperative pain management, patients continue to experience moderate to severe pain. This study was designed to assess the strategy, effectiveness, and safety of postoperative pain management in patients undergoing major gynecological surgery.

Material and Methods:

This observational study included postoperative patients having major gynecological surgery from February 2016 to July 2016. Data collected on a predesigned data collection sheet included patient's demographics, postoperative analgesia modality, patient satisfaction, acute pain service assessment of numeric rating scale (NRS), number of breakthrough pains, number of rescue boluses, time required for the pain relief after rescue analgesia, and any complication for 48 h.

Results:

Among 154 patients reviewed, postoperative analgesia was provided with patient-controlled intravenous analgesia in 91 (59.1%) patients, intravenous opioid infusion in 42 (27%), and epidural analgesia in 21 (13.6%) patients with no statistically significant difference in NRS between different analgesic modalities. On analysis of breakthrough pain, 103 (66.8%) patients experienced moderate pain at one time and 53 (51.4%) at two or more times postoperatively. There were 2 (0.6%) patients experiencing severe breakthrough pain due to gaps in service provision and inadequate patient's knowledge. Moderate-to-severe pain perception was irrespective of type of incision and surgery. Vomiting was significantly higher (P = 0.049) in patients receiving opioids.

Conclusion:

Adequacy of postoperative pain is not solely dependent on drugs and techniques but on the overall organization of pain services. However, incidence of nausea and vomiting was significantly higher in patients receiving opioids.

Effects of Positive End-Expiratory Pressure on the Risk of Postoperative Pulmonary Complications in Patients Undergoing Elective Craniotomy

BACKGROUND

Intraoperative use of positive end-expiratory pressure (PEEP) has a protective effect in patients with acute lung injury and is recommended during anesthesia to minimize postoperative pulmonary complications. However, high levels of pressure might also cause harm to the lung because of overdistension. This retrospective study was designed to compare the effect of low and high levels of PEEP on the risk of postoperative pulmonary complications in patients with normal lung function who were undergoing an elective craniotomy.

METHODS

Two thousand four hundred thirty-seven patients without any pre-existing respiratory disease, who underwent an elective craniotomy, were hospitalized from January 1, 2008, to December 31, 2012. The patients were divided into 2 groups according to the application of an intraoperative PEEP < 5 or ≥ 5 cm H₂O, referred as low and high groups. Primary outcome was the odds of postoperative pneumonia and the requirement for either noninvasive ventilation (NIV) or reintubation and mechanical ventilation (MV).

RESULTS

One thousand twenty-three (42%) of 2437 patients were in the low group, and 1414 patients (58%) were in the high group. Patients in the low group did not show any difference in the incidence of postoperative pneumonia (P = 0.523) or the requirement of postoperative reintubation and MV (P = 0.999) compared with those in the high group. The incidence of reintubation and MV is significantly associated with postoperative pneumonia (P < 0.001).

CONCLUSIONS

Low and high levels of PEEP show similar incidences of postoperative pneumonia and requirement of postoperative NIV or invasive MV in patients with normal function of the lungs undergoing elective craniotomy.

Systematic review and meta-analysis of frailty as a predictor of morbidity and mortality after major abdominal surgery

Background

Frailty is associated with poor prognosis, but the multitude of definitions and scales of assessment makes the impact on outcomes difficult to assess. The aim of this study was to quantify the effect of frailty on postoperative morbidity and mortality, and long‐term mortality after major abdominal surgery, and to evaluate the performance of different frailty metrics.

Methods

An extended literature search was performed to retrieve all original articles investigating whether frailty could affect outcomes after elective major abdominal surgery in adult populations. All possible definitions of frailty were considered. A random‐effects meta‐analysis was carried out for all outcomes of interest. For postoperative morbidity and mortality, overall effect sizes were estimated as odds ratios (OR), whereas the hazard ratio (HR) was calculated for long‐term mortality. The potential effect of the number of domains of the frailty indices was explored through meta‐regression at moderator analysis.

Results

A total of 35 studies with 1 153 684 patients were analysed. Frailty was associated with a significantly increased risk of postoperative major morbidity (OR 2·56, 95 per cent c.i. 2·08 to 3·16), short‐term mortality (OR 5·77, 4·41 to 7·55) and long‐term mortality (HR 2·71, 1·63 to 4·49). All domains were significantly associated with the occurrence of postoperative major morbidity, with ORs ranging from 1·09 (1·00 to 1·18) for co‐morbidity to 2·52 (1·32 to 4·80) for sarcopenia. No moderator effect was observed according to the number of frailty components.

Conclusion

Regardless of the definition and combination of domains, frailty was significantly associated with an increased risk of postoperative morbidity and mortality after major abdominal surgery.

Impact of intrathecal morphine analgesia on the incidence of pulmonary complications after cardiac surgery: a single center propensity-matched cohort study

Background

Acute pain and systemic opioids may both negatively impact respiratory function after cardiac surgery. This study analyzes the local practice of using intrathecal morphine analgesia (ITMA) with minimal parenteral opioid administration in cardiac surgery, specifically the impact on postoperative pulmonary complications (PPCs).

Methods

Data from adult patients who underwent elective cardiac surgery between January 2002, and December 2013 in a single center were analyzed. Propensity scores estimating the likelihood of receiving ITMA were used to match (1:1) patients with ITMA and patients with intravenous analgesia (IVA). Primary outcome was PPCs, a composite endpoint including pneumonia, adult respiratory distress syndrome, and any type of acute respiratory failure. Secondary outcomes were in-hospital mortality, cardiovascular complications, and length of stay in the intensive care unit (ICU) and hospital.

Results

From a total of 1′543 patients, 920 were treated with ITMA and 623 with IVA. No adverse event consequent to the spinal puncture was reported. Propensity score matching created 557 balanced pairs. The occurrence of PPCs in patients with ITMA was 8.1% vs. 12.8% in patients with IVA (odds ratio, 0.6; 95% CI, 0.40–0.89; p = 0.012). Fewer patients with ITMA had a prolonged stay in the ICU (> 4 days; 16.5% vs. 21.2%, p = 0.047) or in the hospital (> 15 days; 25.5% vs. 31.8%. p = 0.024). In-hospital mortality and cardiovascular complications did not differ significantly between the two groups.

Conclusion

In this study involving cardiac surgical patients, ITMA was safely applied and was associated with fewer PPCs.

Electronic supplementary material

The online version of this article (doi:10.1186/s12871-017-0398-z) contains supplementary material, which is available to authorized users.

Nasal high flow therapy: a novel treatment rather than a more expensive oxygen device

Nasal high flow is a promising novel oxygen delivery device, whose mechanisms of action offer some beneficial effects over conventional oxygen systems. The administration of a high flow of heated and humidified gas mixture promotes higher and more stable inspiratory oxygen fraction values, decreases anatomical dead space and generates a positive airway pressure that can reduce the work of breathing and enhance patient comfort and tolerance. Nasal high flow has been used as a prophylactic tool or as a treatment device mostly in patients with acute hypoxaemic respiratory failure, with the majority of studies showing positive results. Recently, its clinical indications have been expanded to post-extubated patients in intensive care or following surgery, for pre- and peri-oxygenation during intubation, during bronchoscopy, in immunocompromised patients and in patients with “do not intubate” status. In the present review, we differentiate studies that suggest an advantage (benefit) from other studies that do not suggest an advantage (no benefit) compared to conventional oxygen devices or noninvasive ventilation, and propose an algorithm in cases of nasal high flow application in patients with acute hypoxaemic respiratory failure of almost any cause.

Comparison of general versus isolated regional anesthesia in total shoulder arthroplasty: A retrospective propensity-matched cohort analysis

BACKGROUND

Intraoperative anesthetic typically consists of either general anesthesia (GA) or isolated regional anesthesia (RA).

METHODS

A retrospective propensity-matched cohort analysis on patients undergoing TSA was performed to determine differences between GA and RA in regard to patient population, complications, LOS and hospital readmission.

RESULTS

4158 patients underwent TSA with GA or isolated RA. Propensity-matching resulted in 912 patients in each cohort. RA had lower overall in-hospital complications and greater homebound discharge disposition with lower 90-day readmission rates than GA.

CONCLUSION

After TSA, isolated RA was associated with lower in-hospital complications, readmission rates and odds of hospital readmission than GA.

Pulmonary complications after abdominal surgery in patients with mild-to-moderate chronic obstructive pulmonary disease

Postoperative pulmonary complications (PPCs) are one of the most important causes of postoperative morbidity and mortality after abdominal surgery. Although chronic obstructive pulmonary disease (COPD) has been considered a risk factor for PPCs, it remains unclear whether mild-to-moderate COPD is a risk factor. This retrospective cohort study included 387 subjects who underwent abdominal surgery with general anesthesia in a tertiary referral hospital. PPCs included pneumonia, pulmonary edema, pulmonary thromboembolism, atelectasis, and acute exacerbation of COPD. Among the 387 subjects, PPCs developed in 14 (12.0%) of 117 patients with mild-to-moderate COPD and in 13 (15.1%) of 86 control patients. Multiple logistic regression analysis revealed that mild-to-moderate COPD was not a significant risk factor for PPCs (odds ratio [OR] =0.79; 95% confidence interval [CI] =0.31-2.03; P=0.628). However, previous hospitalization for respiratory problems (OR =4.20; 95% CI =1.52-11.59), emergency surgery (OR =3.93; 95% CI =1.75-8.82), increased amount of red blood cell (RBC) transfusion (OR =1.09; 95% CI =1.05-1.14 for one pack increase of RBC transfusion), and laparoscopic surgery (OR =0.41; 95% CI =0.18-0.93) were independent predictors of PPCs. These findings suggested that mild-to-moderate COPD may not be a significant risk factor for PPCs after abdominal surgery.

Continuous Positive Airway Pressure Versus Oxygen Therapy in the Cardiac Surgical Ward: A Randomized Trial

BACKGROUND

Noninvasive ventilation (NIV) is a common technique to manage patients with acute respiratory failure in the intensive care unit. However, use of NIV in general wards is less well described. The authors' aim was to demonstrate efficacy of NIV, applied in a cardiac surgery ward, in improving oxygenation in patients who developed hypoxemic acute respiratory failure after being discharged from the intensive care unit.

DESIGN

Randomized, open-label trial.

SETTING

University hospital.

PARTICIPANTS

Sixty-four patients with hypoxemia (PaO₂/F_IO₂ ratio between 100 and 250) admitted to the main ward after cardiac surgery.

INTERVENTIONS

Patients were randomized to receive standard treatment (oxygen, early mobilization, a program of breathing exercises and diuretics) or continuous positive airway pressure in addition to standard treatment. Continuous positive airway pressure was administered 3 times a day for 2 consecutive days. Every cycle lasted 1 to 3 hours. All patients completed their 1-year follow-up. Data were analyzed according to the intention-to-treat principle.

MEASUREMENTS AND MAIN RESULTS

The primary endpoint was the number of patients with PaO₂/F_IO₂<200 48 hours after randomization. Continuous positive airway pressure use was associated with a statistically significant reduction in the number of patients with PaO₂/F_IO₂<200 (4/33 [12%] v 14/31 [45%], p = 0.003). One patient in the control group died at the 30-day follow-up.

CONCLUSIONS

Among patients with acute respiratory failure following cardiac surgery, administration of continuous positive airway pressure in the main ward was associated with improved respiratory outcome. This was the first study that was performed in the main ward of post-surgical patients with acute respiratory failure.

Application of a Multidisciplinary Enhanced Recovery After Surgery Pathway to Improve Patient Outcomes After Transcatheter Aortic Valve Implantation

Enhanced recovery after surgery (ERAS) protocols have proven effective in a variety of surgical specialties. Published reports on these pathways within cardiac surgery and interventional cardiology are limited. Invasive aortic valve replacement procedures are increasingly being performed by hybrid groups of interventional cardiologists and surgeons through transcatheter aortic valve implantation (TAVI). The TAVI patient population is at a higher surgical risk compared with those undergoing surgical aortic valve replacement since they are older, frailer, and have significant co-morbidities which result in an increased risk of perioperative complications. ERAS protocols have the potential to help these patients undergoing TAVI procedures. In conclusion, we propose a TAVI ERAS protocol with a call-to-action for other centers to implement an ERAS protocol to improve hospital and cardiac outcomes.

Effects of Low-Flow Sevoflurane Anesthesia on Pulmonary Functions in Patients Undergoing Laparoscopic Abdominal Surgery

Objective. The aim of this prospective, randomized study was to investigate the effects of low-flow sevoflurane anesthesia on the pulmonary functions in patients undergoing laparoscopic cholecystectomy. Methods. Sixty American Society of Anesthesiologists (ASA) physical status classes I and II patients scheduled for elective laparoscopic cholecystectomy were included in the study. Patients were randomly allocated to two study groups: high-flow sevoflurane anesthesia group (Group H, n = 30) and low-flow sevoflurane anesthesia group (Group L, n = 30). The fresh gas flow rate was of 4 L/min in high-flow sevoflurane anesthesia group and 1 L/min in low-flow sevoflurane anesthesia group. Heart rate (HR), mean arterial blood pressure (MABP), peripheral oxygen saturation (SpO₂), and end-tidal carbon dioxide concentration (ETCO₂) were recorded. Pulmonary function tests were performed before and 2, 8, and 24 hours after surgery. Results. There was no significant difference between the two groups in terms of HR, MABP, SpO₂, and ETCO₂. Pulmonary function test results were similar in both groups at all measurement times. Conclusions. The effects of low-flow sevoflurane anesthesia on pulmonary functions are comparable to high-flow sevoflurane anesthesia in patients undergoing laparoscopic cholecystectomy.

Preoperative Evaluation: Estimation of Pulmonary Risk

Postoperative pulmonary complications (PPCs) are common after major non-thoracic surgery and associated with significant morbidity and high cost of care. A number of risk factors are strong predictors of PPCs. The overall goal of the preoperative pulmonary evaluation is to identify these potential, patient and procedure-related risks and optimize the health of the patients before surgery. A thorough clinical examination supported by appropriate laboratory tests will help guide the clinician to provide optimal perioperative care.

Journal of Clinical Monitoring and Computing 2015 end of year summary: respiration

This paper reviews 17 papers or commentaries published in Journal of Clinical Monitoring and Computing in 2015, within the field of respiration. Papers were published covering monitoring and training of breathing, monitoring of gas exchange, hypoxemia and acid-base, and CO2 monitoring.

Respiratory management of the obese patient undergoing surgery

As a reflection of the increasing global incidence of obesity, there has been a corresponding rise in the proportion of obese patients undergoing major surgery. This review reports the physiological effect of these changes in body composition on the respiratory system and discusses the clinical approach required to maximize safety and minimize the risk to the patient. The changes in respiratory system compliance and lung volumes, which can adversely affect pulmonary gas exchange, combined with upper airways obstruction and sleep-disordered breathing need to be considered carefully in the peri-operative period. Indeed, these challenges in the obese patient have led to a clear focus on the clinical management strategy and development of peri-operative pathways, including pre-operative risk assessment, patient positioning at induction and under anesthesia, modified approach to intraoperative ventilation and the peri-operative use of non-invasive ventilation (NIV) and continuous positive airways pressure.

Superiority of respiratory failure risk index in prediction of postoperative pulmonary complications after digestive surgery in Japanese patients

BACKGROUND

Several multifactorial risk indexes have been proposed by Western countries for identifying patients at a high risk of developing postoperative pulmonary complications (PPC). However, there is no consensus on how to evaluate the risk of PPC and what multifactorial risk index should be adapted for Japanese patients. This study aimed at clarifying the utility of risk indexes to predict PPC following digestive surgeries in Japanese patients.

METHODS

We retrospectively analyzed 892 patients who underwent digestive surgeries under general anesthesia in Niigata University Medical and Dental Hospital between January 2009 and March 2011. PPC was defined as postoperative respiratory failure and postoperative pneumonia. We calculated three risk indexes (respiratory failure risk index (RFRI), postoperative pneumonia risk index, and PPC risk score), and compared them between the PPC group and the non-PPC group. A receiver operating characteristic (ROC) curve analysis was employed to compare the usefulness of each index.

RESULTS

PPC developed in 55 patients (6.2%). All risk indexes were significantly higher in the PPC group than the non-PPC group. The category classification of the risk scores demonstrated a significant tendency to increase the incidence rate of PPC. In the ROC analysis, the area under the curve for RFRI was 0.762 (95% CI 0.697-0.826), which was the highest value observed among these indexes.

CONCLUSIONS

Multifactorial risk indexes are useful tools for identifying Japanese patients at a high risk of developing PPC following digestive surgeries. Of the risk indexes evaluated in this study, RFRI is potentially the most accurate in predicting PPC.

Pulmonary complications after major abdominal surgery: National Surgical Quality Improvement Program analysis

BACKGROUND

Postoperative pulmonary complications (PPCs) after major abdominal surgery are common and associated with significant morbidity and high cost of care. The objective of this study was to identify the risk factors for PPCs after major abdominal surgery.

MATERIALS AND METHODS

The American College of Surgeons' National Surgical Quality Improvement Program database from 2005-2012 was queried for patients who underwent major abdominal surgery (esophagectomy, gastrectomy, pacnreatectomy, enterectomy, hepatectomy, colectomy, and proctectomy). Predictors of PPCs were identified using multivariate logistic regression.

RESULTS

Of 165,196 patients who underwent major abdominal surgery 9595 (5.8%) suffered PPCs (pneumonia 3.2%, prolonged ventilator support ≥48 h 3.0%, and unplanned intubation 2.8%). On multivariate analysis, significant predictors of overall and individual PPCs include esophagectomy, advanced American Society of Anesthesiology Classification System, dependent functional status, prolonged operative time, age ≥80 y, severe chronic obstructive pulmonary disease, preoperative shock, ascites, and smoking. Obesity was not a risk factor. Female gender was overall protective for PPCs.

CONCLUSIONS

PPCs after abdominal procedures are associated with a number of clinical variables. Esophageal operations and American Society of Anesthesiology Classification System were the strongest predictors. These results provide a framework for identifying patients at risk for developing pulmonary complications after major abdominal surgery.

Spirometric values and chest pain intensity three days post-operative coronary artery bypass graft surgery

Aim

Coronary artery bypass graft surgery (CABG) is proved to have ventilatory complications and reduction in spirometric values. This study aimed to examine the hypothesis that reduction of post-operative chest pain intensity would be associated with improvement in the spirometric values for patient underwent CABG.

Materials and method

26 cardiac patients recruited for this study. Their convenience to the study inclusion criteria decided their eligibility. Through 3 days after elective CABG their spirometric values were measured along with their perception to chest pain intensity using 0–10 numeric rating scale. Collected data were recorded and analyzed statistically.

Results

Chest pain intensity showed progressive significant (P = 0.0001) reduction through the 3 days post-operative. On the other hand spirometric values also showed progressive improvement through the 3 days post-operative. This improvement was significant for all measured spirometric values except for the ratio of forced expiratory volume in the 1st second to the forced vital capacity (P = 0.134). There was no significant relationship between the chest pain intensity and spirometric values. This was applied to all measured spirometric values and to the 3 days postoperative.

Conclusion

The current study findings rejected the examined hypothesis that reduction of post-operative chest pain intensity would be associated with improvement in the spirometric values for patient underwent coronary artery bypass graft surgery. There was no significant relationship between the chest pain intensity and any of the spirometric values at any of the 3 post-operative days.

Risk factors and prognosis of critically ill cancer patients with postoperative acute respiratory insufficiency

BACKGROUND

This study aimed to investigate the risk factors and outcome of critically ill cancer patients with postoperative acute respiratory insufficiency.

METHODS

The data of 190 critically ill cancer patients with postoperative acute respiratory insufficiency were retrospectively reviewed. The data of 321 patients with no acute respiratory insufficiency as controls were also collected. Clinical variables of the first 24 hours after admission to intensive care unit were collected, including age, sex, comorbid disease, type of surgery, admission type, presence of shock, presence of acute kidney injury, presence of acute lung injury/acute respiratory distress syndrome, acute physiologic and chronic health evaluation (APACHE II) score, sepsis-related organ failure assessment (SOFA), and PaO2/FiO2 ratio. Duration of mechanical ventilation, length of intensive care unit stay, intensive care unit death, length of hospitalization, hospital death and one-year survival were calculated.

RESULTS

The incidence of acute respiratory insufficiency was 37.2% (190/321). Multivariate logistic analysis showed a history of chronic obstructive pulmonary diseases (P=0.001), surgery-related infection (P=0.004), hypo-volemic shock (P<0.001), and emergency surgery (P=0.018), were independent risk factors of postoperative acute respiratory insufficiency. Compared with the patients without acute respiratory insufficiency, the patients with acute respiratory insufficiency had a prolonged length of intensive care unit stay (P<0.001), a prolonged length of hospitalization (P=0.006), increased intensive care unit mortality (P=0.001), and hospital mortality (P<0.001). Septic shock was shown to be the only independent prognostic factor of intensive care unit death for the patients with acute respiratory insufficiency (P=0.029, RR: 8.522, 95%CI: 1.243-58.437, B=2.143, SE=0.982, Wald=4.758). Compared with the patients without acute respiratory insufficiency, those with acute respiratory insufficiency had a shortened one-year survival rate (78.7% vs. 97.1%, P<0.001).

CONCLUSION

A history of chronic obstructive pulmonary diseases, surgery-related infection, hypovolemic shock and emergency surgery were risk factors of critically ill cancer patients with postoperative acute respiratory insufficiency. Septic shock was the only independent prognostic factor of intensive care unit death in patients with acute respiratory insufficiency. Compared with patients without acute respiratory insufficiency, those with acute respiratory insufficiency had adverse short-term outcome and a decreased one-year survival rate.

Positive end-expiratory pressure (PEEP) during anaesthesia for prevention of mortality and postoperative pulmonary complications

BACKGROUND

General anaesthesia causes atelectasis, which can lead to impaired respiratory function. Positive end-expiratory pressure (PEEP) is a mechanical manoeuvre that increases functional residual capacity (FRC) and prevents collapse of the airways, thereby reducing atelectasis. It is not known whether intraoperative PEEP alters the risks of postoperative mortality and pulmonary complications. This review was originally published in 2010 and was updated in 2013.

OBJECTIVES

To assess the benefits and harms of intraoperative PEEP in terms of postoperative mortality and pulmonary outcomes in all adult surgical patients.

SEARCH METHODS

We searched the Cochrane Central Register of Controlled Trials (CENTRAL) 2013, Issue 10, part of The Cochrane Library, as well as MEDLINE (via Ovid) (1966 to October 2013), EMBASE (via Ovid) (1980 to October 2013), CINAHL (via EBSCOhost) (1982 to October 2013), ISI Web of Science (1945 to October 2013) and LILACS (via BIREME interface) (1982 to October 2010). The original search was performed in January 2010.

SELECTION CRITERIA

We included randomized clinical trials assessing the effects of PEEP versus no PEEP during general anaesthesia on postoperative mortality and postoperative respiratory complications in adults, 16 years of age and older.

DATA COLLECTION AND ANALYSIS

Two review authors independently selected papers, assessed trial quality and extracted data. We contacted study authors to ask for additional information, when necessary. We calculated the number of additional participants needed (information size) to make reliable conclusions.

MAIN RESULTS

This updated review includes two new randomized trials. In total, 10 randomized trials with 432 participants and four comparisons are included in this review. One trial had a low risk of bias. No differences were demonstrated in mortality, with risk ratio (RR) of 0.97 (95% confidence interval (CI) 0.20 to 4.59; P value 0.97; 268 participants, six trials, very low quality of evidence (grading of recommendations assessment, development and evaluation (GRADE)), and in pneumonia, with RR of 0.40 (95% CI 0.11 to 1.39; P value 0.15; 120 participants, three trials, very low quality of evidence (GRADE)). Statistically significant results included the following: The PEEP group had higher arterial oxygen pressure (PaO2)/fraction of inspired oxygen (FiO2) on day one postoperatively, with a mean difference of 22.98 (95% CI 4.40 to 41.55; P value 0.02; 80 participants, two trials, very low quality of evidence (GRADE)), and postoperative atelectasis (defined as an area of collapsed lung, quantified by computerized tomography scan) was less in the PEEP group (standard mean difference -1.2, 95% CI -1.78 to -0.79; P value 0.00001; 88 participants, two trials, very low quality of evidence (GRADE)). No adverse events were reported in the three trials that adequately measured these outcomes (barotrauma and cardiac complications). Using information size calculations, we estimated that a further 21,200 participants would have to be randomly assigned to allow a reliable conclusion about PEEP and mortality.

AUTHORS' CONCLUSIONS

Evidence is currently insufficient to permit conclusions about whether intraoperative PEEP alters risks of postoperative mortality and respiratory complications among undifferentiated surgical patients.

The importance of in-hospital mortality for patients requiring free tissue transfer for head and neck oncology

Mortality is a rare but disastrous complication of microvascular head and neck reconstruction. The investigators attempt to identify the procedure-related mortality cases and analyse the causes of death. A retrospective analysis of 804 consecutive free flap procedures during a 19-year period was performed and fatal cases were identified (n=42 deaths). Multivariate logistic regression was employed to determine the association of in-hospital mortality with patient-related characteristics. The 30-day post-operative mortality rate was 1% (8 out of 804 patients), and the in-hospital mortality rate (post-operative deaths in-hospital before or after the 30th post-operative day without discharge) was 5.2% (42 out of 804 patients). Cancer recurrence and metastases related pneumonia were the most common causes of death (n=26, 62%), followed by cardiac, pulmonary, infectious and hepatic/renal aetiologies. Logistic regression analysis revealed that patients with stage IV disease and an operation time of >9h were significantly associated with post-operative mortality. Malignancy-related conditions were the most common causes of death following free flap transfer for head and neck reconstruction. For patients with stage IV head and neck cancer, this aggressive surgical approach should be cautiously justified due to its association with post-operative mortality. To shorten the operation time, experienced microsurgical operation teams are necessary.

Complications of general anesthesia

A summary of complications associated with general anesthesia including their incidence, mechanism, risk factors, prevention strategies, and management is presented.

N-terminal prohormone B-type natriuretic peptide and weaning outcome in postoperative patients with pulmonary complications

Objective

To evaluate the relationship between plasma N-terminal prohormone B-type natriuretic peptide (NT-proBNP) and weaning outcomes, and the ability of NT-proBNP level to predict weaning success, in cancer patients with pulmonary complications undergoing noncardiac major surgeries.

Methods

Patients who were mechanically ventilated following postoperative respiratory failure were enrolled. NT-proBNP levels at the end of a 2-h spontaneous breathing trial were measured. Weaning was considered a success in patients who completed the trial and maintained spontaneous breathing following extubation for >48 h.

Results

Out of 29 patients, 22 patients weaned successfully but weaning failed in 7 patients. Plasma NT-proBNP was significantly higher in the weaning failure group than in the weaning success group. For predicting weaning success, the optimal NT-proBNP threshold value at the end of the spontaneous breathing trial was <448 ng/l (receiver operating characteristic analysis; sensitivity 68.18%, specificity 85.71%, positive predictive value 93.7% and negative predictive value 46.2%).

Conclusion

Measuring NT-proBNP at the end of a spontaneous breathing trial may assist in predicting weaning success, as a noninvasive, quantitative and repeatable indicator of cardiac stress in patients with postsurgical respiratory failure.

Postoperative pulmonary complications: reducing risks for noncardiac surgery

Postoperative pulmonary complications (PPCs) are a major contributor to the overall risk of noncardiac surgery that may lead to serious postoperative morbidity and long-term mortality. Nurse practitioners should be familiar with risk indices for PPCs, clinical guidelines, and risk reduction strategies to prevent PPCs and improve PPC outcomes.

Postoperative adverse outcomes in surgical patients with dementia: a retrospective cohort study

BACKGROUND

Dementia patients often present with coexisting medical conditions and potentially face higher risk of complications during hospitalization. Because the general features of postoperative adverse outcomes among surgical patients with dementia are unknown, we conducted a nationwide, retrospective cohort study to characterize surgical complications among dementia patients compared with sex- and age-matched nondementia controls.

METHODS

Reimbursement claims from the Taiwan National Health Insurance Research Database were studied. A total of 18,923 surgical patients were enrolled with preoperative diagnosis of dementia for 207,693 persons aged 60 years or older who received inpatient major surgeries between 2004 and 2007. Their preoperative comorbidities were adjusted and risks for major surgical complications were analyzed.

RESULTS

Dementia patients who underwent surgery had a significantly higher overall postoperative complication rate, adjusted odds ratio (OR) 1.79 (95 % confidence interval [CI] 1.72-1.86), with higher medical resources use, and in-hospital expenditures. Compared with controls, dementia patients had a higher incidence of certain postoperative complications that are less likely to be identified in their initial stage, such as: acute renal failure, OR = 1.32 (1.19-1.47); pneumonia, OR = 2.18 (2.06-2.31); septicemia, OR = 1.8 (1.69-1.92); stroke, OR = 1.51 (1.43-1.6); and urinary tract infection, OR = 1.62 (1.5-1.74).

CONCLUSIONS

These findings have specific implications for postoperative care of dementia patients regarding complications that are difficult to diagnose in their initial stages. Acute renal failure, pneumonia, septicemia, stroke, and urinary tract infection are the top priorities for prevention, early recognition, and intervention of postoperative complications among surgical patients with dementia. Further efforts are needed to determine specific protocols for health care teams serving this population.

Preoperative warming up exercises improve laparoscopic operative times in an experienced laparoscopic surgeon

BACKGROUND AND PURPOSE

Performing warm-up exercises before athletic competition or stage performance is very common; however, most surgeons do not "warm up" before performing complex surgery. We analyzed the intraoperative effects of warming up before surgery in an experienced laparoscopic surgeon.

METHODS

A retrospective review of all laparoscopic partial (LPN) and radical nephrectomies (LRN) completed by an experienced laparoscopic surgeon (RVC) were analyzed according to whether warm-up exercises were performed before surgery. Routine warm-up consisted of 15 to 20 minutes of pelvic trainer suturing exercises (forehand and backhand sutures and knot tying), using both hands. Intraoperative and postoperative parameters were examined.

RESULTS

LRN and LPN subjects were well matched among the warm-up group and nonwarm-up group. Patients in the LPN warm-up group did have significantly larger tumors (3.7 cm vs 2.4 cm, P=0.02). Despite larger tumors, surgical time was significantly less in the warm-up group (227 min vs 281 min, P=0 .04), and total operating room time trended toward significance (320 min vs 371 min, P=0.0501). Similarly, in the LRN group, operative times and total operating room time was significantly less in the preoperative warm-up group (P=0.0068 and P=0.014, respectively). Intraoperative and postoperative complications, estimated blood loss, positive margin rate, warm ischemia time, length of stay, changes in hemoglobin and creatinine levels from baseline were not significantly different between the two groups.

CONCLUSION

Performing warm-up exercises before complex laparoscopic surgery may improve operative times and performance in the operating room, especially for complex laparoscopic surgeries.

Rationale and study design of PROVHILO - a worldwide multicenter randomized controlled trial on protective ventilation during general anesthesia for open abdominal surgery

BACKGROUND

Post-operative pulmonary complications add to the morbidity and mortality of surgical patients, in particular after general anesthesia >2 hours for abdominal surgery. Whether a protective mechanical ventilation strategy with higher levels of positive end-expiratory pressure (PEEP) and repeated recruitment maneuvers; the "open lung strategy", protects against post-operative pulmonary complications is uncertain. The present study aims at comparing a protective mechanical ventilation strategy with a conventional mechanical ventilation strategy during general anesthesia for abdominal non-laparoscopic surgery.

METHODS

The PROtective Ventilation using HIgh versus LOw positive end-expiratory pressure ("PROVHILO") trial is a worldwide investigator-initiated multicenter randomized controlled two-arm study. Nine hundred patients scheduled for non-laparoscopic abdominal surgery at high or intermediate risk for post-operative pulmonary complications are randomized to mechanical ventilation with the level of PEEP at 12 cmH(2)O with recruitment maneuvers (the lung-protective strategy) or mechanical ventilation with the level of PEEP at maximum 2 cmH(2)O without recruitment maneuvers (the conventional strategy). The primary endpoint is any post-operative pulmonary complication.

DISCUSSION

The PROVHILO trial is the first randomized controlled trial powered to investigate whether an open lung mechanical ventilation strategy in short-term mechanical ventilation prevents against postoperative pulmonary complications.

TRIAL REGISTRATION

ISRCTN: ISRCTN70332574.