Superior Parietal Lobule: A Role in Relative Localization of Multiple Different Elements

Simultanagnosia is an impairment in processing multiple visual elements simultaneously consecutive to bilateral posterior parietal damage, and neuroimaging data have specifically implicated the superior parietal lobule (SPL) in multiple element processing. We previously reported that a patient with focal and bilateral lesions of the SPL performed slower than controls in visual search but only for stimuli consisting of separable lines. Here, we further explored this patient's visual processing of plain object (colored disk) versus object consisting of separable lines (letter), presented in isolation (single object) versus in triplets. Identification of objects was normal in isolation but dropped to chance level when surrounded by distracters, irrespective of eccentricity and spacing. We speculate that this poor performance reflects a deficit in processing objects' relative locations within the triplet (for colored disks), aggravated by a deficit in processing the relative location of each separable line (for letters). Confirming this, performance improved when the patient just had to detect the presence of a specific colored disk within the triplets (visual search instruction), while the inability to identify the middle letter was alleviated when the distracters were identical letters that could be grouped, thereby reducing the number of ways individual lines could be bound.

Prognostic relevance of the posterior resection margin for predicting disease free survival in ampullary adenocarcinoma

BACKGROUND

Pancreaticoduodenectomy is the only curative treatment option for patients with resectable ampullary adenocarcinoma (AA). Excellent disease free survival (DFS) can be achieved in patients with clear resection margins but it is poorly understood which patients are at increased risk of recurrence and hence would benefit from adjuvant chemotherapy. There is evolving evidence that the anatomical location of incomplete resection margins influences DFS in pancreatic adenocarcinoma. It is unknown if this also pertains to AA and therefore this study aimed to assess individual resection margin status and other predictors of DFS in AA.

MATERIAL & METHODS

Consecutive patients undergoing pancreaticoduodenectomy for AA at our institution from 1996 to 2017 were analysed. Pancreas neck, posterior and superior mesenteric vein margins were assessed individually. Cox proportional hazards modelling was used to identify predictors of 5-year DFS. Factors with p < 0.1 on univariate analysis were included for multivariate analysis.

RESULTS

Analysis of 104 patients revealed median OS and DFS of 56 and 34 months, respectively. Predictors associated with worse DFS on multivariate analysis were T3-stage (HR 3.6, p = 0.048), N1 (HR 2.9, p = 0.01) and N2 -stage (HR 3.6, p = 0.006), R1 status at the posterior margin (HR 3.0, p = 0.009) and a visible mass on CT (HR 2.0, p = 0.039).

CONCLUSION

Routine histopathological assessment of individual resection margins may aid in predicting recurrence of AA. Future studies to assess if routine mesopancreas excision during pancreaticoduodenectomy can reduce the incidence of R1 status at the posterior margin are warranted.

Thoracic cancer surgery during the COVID-19 pandemic: a consensus statement from the Thoracic Domain of the Asian Society for Cardiovascular and Thoracic Surgery

OBJECTIVES

Healthcare resources have been mobilized to combat the COVID-19 pandemic of 2020. The Thoracic Domain of the Asian Society for Cardiovascular and Thoracic Surgery reports a consensus statement on the provision of thoracic cancer surgery during this pandemic.

METHODS

A Thoracic Experts Panel was convened by the Society. A consensus on the provision, safety, and setting of thoracic cancer surgery during the pandemic was obtained through a Delphi process.

RESULTS

Responses were received from 26 panel members (96% response rate) from 10 regions across Asia. The Society recommended that elective thoracic cancer surgery services may need to be reduced or postponed if medical resources were needed for COVID-19 patients, especially intensive care unit beds and ventilators. However, thoracic cancer surgery should proceed as normal for all solid tumors, without restrictions based on disease stage, availability of non-surgical treatment options, or patient condition (unless there is a high likelihood of postoperative intensive care unit stay). Aerosol-forming procedures should be avoided intra- and perioperatively. The surgical approach does not make a difference in terms of safety. Services for thoracic cancer patients should be offered only in hospitals that maintain isolation wards for patients with confirmed or suspected COVID-19.

CONCLUSIONS

Services for patients with thoracic cancer should be maintained during the COVID-19 pandemic. The position of the Society is that thoracic surgeons have a responsibility to perform good surgical management of thoracic cancer during the pandemic, to advocate for patients' rights to receive it, and to safeguard patients and staff from infection.

General thoracic surgery services across Asia during the 2020 COVID-19 pandemic

The COVID-19 pandemic of 2020 posed an historic challenge to healthcare systems around the world. Besides mounting a massive response to the viral outbreak, healthcare systems needed to consider provision of clinical services to other patients in need. Surgical services for patients with thoracic disease were maintained to different degrees across various regions of Asia, ranging from significant reductions to near-normal service. Key determinants of robust thoracic surgery service provision included: preexisting plans for an epidemic response, aggressive early action to "flatten the curve", ability to dedicate resources separately to COVID-19 and routine clinical services, prioritization of thoracic surgery, and the volume of COVID-19 cases in that region. The lessons learned can apply to other regions during this pandemic, and to the world, in preparation for the next one.

Robotic thoracic surgery in inflammatory and infective diseases

Tuberculosis and inflammatory conditions are endemic in India and South-East Asia. They cause intense inflammatory reactions and adhesions, thus making surgical resection difficult. In 2009, we installed an intuitive da Vinci HDSi robot to perform our surgery as a part of a robotic thoracic surgery unit. We reviewed our practice to report the trials and tribulations of starting a robotic thoracic surgery program in an inflammatory and infective disease endemic third-world country. With the success of the multispecialty robotic surgery program, we were able to purchase a second robot with an operating console and a training console. The robot is an additional tool in the armamentarium of the thoracic surgeon. It provides good vision in inflammatory conditions, facilitates dissection of dense adhesions with minimal blood loss, and the ability of the robotic endowrist allows maximum and safe manipulation at the thoracic outlet. Sleeve resection and sleeve lobectomy are technically possible, due to ease of suturing with the robotic platform. Complex resections for tuberculosis, aspergilloma, inflammatory tumours and post-infective bronchiectasis are safer using the robotic thoracic platform. This is our operation of choice in complex thoracic surgery cases.

Improvement of Storage Medium for Cultured Human Retinal Pigment Epithelial Cells Using Factorial Design

Storage of human retinal pigment epithelium (hRPE) can contribute to the advancement of cell-based RPE replacement therapies. The present study aimed to improve the quality of stored hRPE cultures by identifying storage medium additives that, alone or in combination, contribute to enhancing cell viability while preserving morphology and phenotype. hRPE cells were cultured in the presence of the silk protein sericin until pigmentation. Cells were then stored for 10 days in storage medium plus sericin and either one of 46 different additives. Individual effects of each additive on cell viability were assessed using epifluorescence microscopy. Factorial design identified promising additive combinations by extrapolating their individual effects. Supplementing the storage medium with sericin combined with adenosine, L-ascorbic acid and allopurinol resulted in the highest cell viability (98.6 ± 0.5%) after storage for three days, as measured by epifluorescence microscopy. Flow cytometry validated the findings. Proteomics identified 61 upregulated and 65 downregulated proteins in this storage group compared to the unstored control. Transmission electron microscopy demonstrated the presence of melanosomes after storage in the optimized medium. We conclude that the combination of adenosine, L-ascorbic acid, allopurinol and sericin in minimal essential medium preserves RPE pigmentation while maintaining cell viability during storage.

Genetic barcoding and phylogenetic analysis of dusky cotton bug (Oxycarenus hyalinipennis) using mitochondrial cytochrome c oxidase I gene

Cotton dusky bug (Oxycarenus spp.) mostly attack on cash crops such as Gossypium, Cola and Hibiscus which affect the national economy therefore sustainable pest management is needed. Cytochrome c oxidase I (COI) gene is utilized as marker gene for DNA barcoding, genetic and ecological study of insects. In present study insect (cotton dusky bug) samples were collected from cotton fields in Faisalabad. COI gene was amplified from genomic DNA of bug and cloned into pTZ57R/T vector (Fermentas). The clone was sent to Macrogen (South Korea) for Sanger sequencing. The phylogenetic analysis and pairwise multiple sequence alignment showed that our cotton dusky bug grouped with two species of Oxycarenus genus and highest sequence identity was 91.1% with Oxycarenus hylinipennis. This is the first report of genetic barcode of Oxycarenus hylinipennis from cotton from Pakistan.

Meta-analysis of adjuvant therapy following curative surgery for periampullary adenocarcinoma

BACKGROUND

Periampullary cancers are uncommon malignancies, often amenable to surgery. Several studies have suggested a role for adjuvant chemotherapy and chemoradiotherapy in improving survival of patients with periampullary cancers, with variable results. The aim of this meta-analysis was to determine the survival benefit of adjuvant therapy for periampullary cancers.

METHODS

A systematic review was undertaken of literature published between 1 January 2000 and 31 December 2015 to elicit and analyse the pooled overall survival associated with the use of either adjuvant chemotherapy or chemoradiotherapy versus observation in the treatment of surgically resected periampullary cancer. Included articles were also screened for information regarding stage, prognostic factors and toxicity-related events.

RESULTS

A total of 704 titles were screened, of which 93 full-text articles were retrieved. Fourteen full-text articles were included in the study, six of which were RCTs. A total of 1671 patients (904 in the control group and 767 who received adjuvant therapy) were included. The median 5-year overall survival rate was 37·5 per cent in the control group, compared with 40·0 per cent in the adjuvant group (hazard ratio 1·08, 95 per cent c.i. 0·91 to 1·28; P = 0·067). In 32·2 per cent of patients who had adjuvant therapy, one or more WHO grade 3 or 4 toxicity-related events were noted. Advanced T category was associated worse survival (regression coefficient -0·14, P = 0·040), whereas nodal status and grade of differentiation were not.

CONCLUSION

This systematic review found no associated survival benefit for adjuvant chemotherapy or chemoradiotherapy in the treatment of periampullary cancer.

Aspergilloma of the Lung: Strategy to Prevent Endobronchial Spillage

Aspergilloma of the lung eroding into the airway may lead to perioperative endobronchial spillage and contamination of the normal lung. Our aim in this group of patients who are undergoing robotic- or video-assisted thoracoscopic lobectomy is to protect the contralateral lung and, if possible, uninvolved lobes of ipsilateral lung. Double-lumen endobronchial tubes do provide lung protection to the contralateral lung intraoperatively, but there is no protection to the ipsilateral lung lobes not involved by the disease process. Moreover, there is no lung protection against endobronchial spillage during the period of induction of general anesthesia, when the cough reflex and gag reflex are absent. We have devised a technique to advance from side selection to lobe selection, that is, selective lobar isolation to prevent perioperative contamination of uninvolved lung lobes. This technique has two components viz positioning of the patient and securing the airway. The technique can also be used in other conditions such as hydatid cyst of the lung, lung abscess communicating with the airway and bleeding into the airway.

A tale of surviving three consecutive cardiorespiratory arrests on table during a right sided pneumonectomy

Background

Intraoperative cardiorespiratory arrest secondary to lower airway obstruction is often difficult to manage. We describe the management of one such technically challenging case of three consecutive cardiorespiratory arrests during a right pneumonectomy in a young boy.

Methods

A 10 years boy with a large fleshy vascular endobronchial tumor (biopsy proven squamous papilloma), completely occluding the right main-stem bronchus with collapse-consolidation of underlying right lung, was posted for a right pneumonectomy. There were dense adhesions of lung to the parieties and the lung was completely damaged. Twenty-five minutes into the surgery, patient started desaturating and the anesthetist was having difficulty in ventilating him. Check bronchoscopy showed endobronchial bleeding and the double lumen tube abutting the tumor. He was turned supine and CPR performed along with suctioning of blood and repositioning of tube. Patient revived and surgery continued. One and a half hour into the surgery the boy had a second cardiorespiratory arrest due to similar airway obstruction and managed in similar fashion. Lower lobectomy was speedily done to gain access to the hilum followed by quick completion pneumonectomy. Immediately following specimen removal, the patient had the third cardiorespiratory arrest and anesthetist was unable to ventilate the patient even after suctioning and repositioning of tube. With patient in lateral position, through the thoracotomy, right bronchial stump was opened and a quick bronchial intubation performed by the surgeon in chief. On opening the bronchus a tumor ball was seen occluding the left main bronchus, which probably got detached from the main tumor during pneumonectomy. Residual tumor was delivered out and the bronchial stump closed. Patient was transferred to ICU on ventilatory support.

Results

Postoperatively he was extubated after 48 hours and was found to have no neurological deficit. Chest drain came out on POD2 and he was discharged on POD5.

Conclusions

Promptly and methodically addressing this technical challenge helped us to prevent mortality. We also managed to avoid neurological sequelae of cardiorespiratory arrest. Learning point in this case is that when faced with a similar situation, it's important to stay calm and focused and to handle the challenge in a scientific and logical manner.

Robotic assisted thoracoscopic right upper lobectomy for post tuberculosis aspergilloma

BACKGROUND

Minimally invasive techniques for non-oncologic lung resections especially fungal infections are not widely employed. Through this video we share our experience of one such case of a robotic resection of pulmonary aspergilloma.

METHODS

A 55-year-old male with recurrent hemoptysis underwent surgical resection of post tuberculosis aspergilloma of right upper lobe using a 4-arm DaVinci Robot.

RESULTS

He received antituberculous drugs for 6 weeks pre-operatively. Systemic antifungals were given 2 weeks prior and continued for 3 months postoperatively. The operative time was 188 minutes and blood loss was 560 mL. Postoperative Chest X-rays showed complete lung expansion.

CONCLUSIONS

Robotic resection of lung is technically possible with good clinical outcomes even in infective pathologies. Robotic technique allows excellent 3D visualisation and good dexterity for easier and safe dissection of adhesions, as well as effective and precise anatomical lung resections for pulmonary aspergilloma.

From 200 BC to 2015 AD: an integration of robotic surgery and Ayurveda/Yoga

BACKGROUND

Among the traditional systems of medicine practiced all over the world, Ayurveda and Yoga has a documented history dating back to beyond 200 BC. Robotic and video assisted thoracic surgery (VATS) is an invention of the 21(st) century. We aim to quantify the effects of integration of Ayurveda and Yoga on patients undergoing minimally invasive robotic and VATS.

METHODS

Four hundred and fifty-four patients undergoing VATS and robotic thoracic surgery were introduced to a pre and postoperative protocol of Yoga therapy, mediation and oil massages. Yoga exercises included Pranayam, Anulom Vilom, and Oil Massages included Urotarpan. Preoperative and postoperative respiratory functions were recorded. Patient satisfaction questionnaire were noted. Statistical comparison was made to control group undergoing minimally invasive thoracic surgery without integrative medicine. Only one patient refused to undergo Ayurveda therapy and was deleted from the group.

RESULTS

Acceptability was high among all patients. Preoperative training led to implementation as early as 6 hours post surgery. Pulmonary function test showed significant improvement. All patients suggested an improvement in satisfaction score. Pain score were less in study patients. Quicker mobilization led to early discharge and drain removal. Chronic pain was prevented in patients having oil massages over the healed wound sites.

CONCLUSIONS

Integration of Ayurveda, Yoga and minimally invasive robotic and VATS is acceptable to Indian patients and gives better clinical results and higher patient satisfaction.

The Silk-protein Sericin Induces Rapid Melanization of Cultured Primary Human Retinal Pigment Epithelial Cells by Activating the NF-κB Pathway

Restoration of the retinal pigment epithelial (RPE) cells to prevent further loss of vision in patients with age-related macular degeneration represents a promising novel treatment modality. Development of RPE transplants, however, requires up to 3 months of cell differentiation. We explored whether the silk protein sericin can induce maturation of primary human retinal pigment epithelial (hRPE) cells. Microarray analysis demonstrated that sericin up-regulated RPE-associated transcripts (RPE65 and CRALBP). Upstream analysis identified the NF-κB pathway as one of the top sericin-induced regulators. ELISA confirmed that sericin stimulates the main NF-κB pathway. Increased levels of RPE-associated proteins (RPE65 and the pigment melanin) in the sericin-supplemented cultures were confirmed by western blot, spectrophotometry and transmission electron microscopy. Sericin also increased cell density and reduced cell death following serum starvation in culture. Inclusion of NF-κB agonists and antagonists in the culture medium showed that activation of the NF-κB pathway appears to be necessary, but not sufficient, for sericin-induced RPE pigmentation. We conclude that sericin promotes pigmentation of cultured primary hRPE cells by activating the main NF-κB pathway. Sericin’s potential role in culture protocols for rapid differentiation of hRPE cells derived from embryonic or induced pluripotent stem cells should be investigated.

Evaluation of Pulmonary Nodules: Clinical Practice Consensus Guidelines for Asia

BACKGROUND

American College of Chest Physicians (CHEST) clinical practice guidelines on the evaluation of pulmonary nodules may have low adoption among clinicians in Asian countries. Unique patient characteristics of Asian patients affect the diagnostic evaluation of pulmonary nodules. The objective of these clinical practice guidelines was to adapt those of CHEST to provide consensus-based recommendations relevant to practitioners in Asia.

METHODS

A modified ADAPTE process was used by a multidisciplinary group of pulmonologists and thoracic surgeons in Asia. An initial panel meeting analyzed all CHEST recommendations to achieve consensus on recommendations and identify areas that required further investigation before consensus could be achieved. Revised recommendations were circulated to panel members for iterative review and redrafting to develop the final guidelines.

RESULTS

Evaluation of pulmonary nodules in Asia broadly follows those of the CHEST guidelines with important caveats. Practitioners should be aware of the risk of lung cancer caused by high levels of indoor and outdoor air pollution, as well as the high incidence of adenocarcinoma in female nonsmokers. Furthermore, the high prevalence of granulomatous disease and other infectious causes of pulmonary nodules need to be considered. Therefore, diagnostic risk calculators developed in non-Asian patients may not be applicable. Overall, longer surveillance of nodules than those recommended by CHEST should be considered.

CONCLUSIONS

TB in Asia favors lesser reliance on PET scanning and greater use of nonsurgical biopsy over surgical diagnosis or surveillance. Practitioners in Asia are encouraged to use these adapted consensus guidelines to facilitate consistent evaluation of pulmonary nodules.

Video assisted thoracoscopic excision of mediastinal ectopic parathyroid adenomas: a UK regional experience

BACKGROUND

To report the first series of video-assisted thoracoscopic surgery (VATS) resection of mediastinal ectopic parathyroid adenomas (MEPAs) in the UK.

METHODS

A case series of seven cases undergoing VATS between 2004 and 2009 to treat single gland hyperparathyroidism. Methylene blue (MB) was used in 5/7 cases immediately before exploration to identify the adenomas. Carbon dioxide (CO2) up to pressures of 10 mmHg was used safely to deflate the lung in two cases.

RESULTS

There were five women and two men with a mean age of 53 years (range, 27-72 years). Histopathology confirmed successful resection of the parathyroid adenoma in 6/7 cases. There was one conversion to open thoracotomy due to bleeding from the azygos vein resulting from excessive traction. Despite marked MB uptake, this patient proved to have tuberculoid adenopathy and no parathyroid tissue was identified. Postoperative plasma calcium returned to normal in 6/7 patients and parathyroid hormone (PTH) level in 6/7 patients. The median hospital stay was 2 days and there was no mortality in this series.

CONCLUSIONS

MEPAs can be safely resected using VATS with minimal surgical morbidity, short drainage time and short hospital stay. CO2 insufflation and the intraoperative use of MB are safe and help to accurately localise the ectopic adenoma. VATS should be considered as the first-line approach for resection of MEPAs.

A novel technique to prevent endobronchial spillage during video assisted thoracoscopic lobectomy

Endobronchial spillage of fungal material into normal lung can infect it and the spillage of fungal material should be prevented during surgery. We report our experience of a patient who presented for right upper lobectomy with bronchiectasis, tubercular destruction and subsequent aspergilloma. A 4F Fogarty catheter was introduced through the tracheal lumen of the left sided endobronchial double lumen tube (DLT) to occlude the bronchus intermedius to prevent spillage of aspergilloma into the non-infected lower and middle lobes of the right lung. The Fogarty catheter was pulled into the trachea just before stapling the bronchus; thereafter, right upper lobectomy was completed successfully. The patient was extubated uneventfully and transferred to post-operative recovery ward. The endobronchial blockage of the intermediate bronchus of the operative lung by the Fogarty catheter and isolation of the left lung by the DLT prevented spillage of aspergilloma in both the operative right lung and the left lung.

The Attentional Fields of Visual Search in Simultanagnosia and Healthy Individuals: How Object and Space Attention Interact

Simultanagnosia is a deficit in which patients are unable to perceive multiple objects simultaneously. To date, it remains disputed whether this deficit results from disrupted object or space perception. We asked both healthy participants as well as a patient with simultanagnosia to perform different visual search tasks of variable difficulty. We also modulated the number of objects (target and distracters) presented. For healthy participants, we found that each visual search task was performed with a specific "attentional field" depending on the difficulty of visual object processing but not on the number of objects falling within this "working space." This was demonstrated by measuring the cost in reaction times using different gaze-contingent visible window sizes. We found that bilateral damage to the superior parietal lobule impairs the spatial integration of separable features (within-object processing), shrinking the attentional field in which a target can be detected, but causing no deficit in processing multiple objects per se.

The effect of a primary tumour resection on the progression of synchronous colorectal liver metastases: an exploratory study

AIM

The objective of this study was to determine the effect of an upfront primary tumour resection on the progression of synchronous colorectal liver metastases.

MATERIALS AND METHODS

Patients with synchronous colorectal liver metastases referred between 2005 and 2010 were identified. Patients were analysed according to the following two groups: 1) an upfront primary tumour resection and 2) neo-adjuvant chemotherapy. A univariate and multivariate analysis was performed to identify factors significantly contributing to progressive disease. Cox regression analysis was undertaken to determine the effect of management on overall survival (OS) and time to tumour progression (TTP).

RESULTS

A total of 116 patients with synchronous colorectal liver metastases were identified of which 49 patients received an upfront primary tumour resection and 67 received neo-adjuvant chemotherapy. Liver resections were performed in 18 (36.7%) and 14 (20.9%) of the patients in the upfront and neo-adjuvant groups respectively (P 0.06). On multivariate analysis, an upfront primary tumour resection significantly affected progressive disease (p < 0.001, OR 5.67; 95% CI 2.71-11.79). An upfront tumour resection was not a significant predictor of overall survival (P = 0.83; HR 1.10; 95% CI 0.48-2.52).

CONCLUSION

Our findings suggest that an upfront primary tumour resection in patients with synchronous colorectal liver metastases results in progressive disease. These preliminary findings need to be validated in a future multi-centre independent study.

Uniportal video-assisted thoracic surgery: the lesser invasive thoracic surgery

OBJECTIVES

We evaluated whether single-port video-assisted thoracic surgery is feasible without compromising outcomes, and whether the technique could be reproduced by a trainee.

METHODS

In a 6-month period, 37 operations were performed by single-port video-assisted thoracic surgery. Of the 37 patients, 27 (73%) were male and the mean age was 45.1 ± 21 years. Twenty-three (62%) were operated on by consultants and 14 (38%) by trainees. The procedures included 19 (51.3%) operations for treatment of pneumothoraces, 8 (21.6%) metastasectomies, 7 (18.9%) lung biopsies, 2 (5.4%) empyema débridements, and 1 (2.7%) pleuropericardial window.

RESULTS

Mean operative time was 51.8 ± 14.7 min. Patient-controlled analgesia infusion was used for 1.3 ± 1 days. Three (8.1%) patients needed an operative reintervention, but there was no intensive treatment unit admission or hospital mortality. Mean postoperative hospital stay was 3.3 ± 2.7 days. On follow-up, all patients had a tissue diagnosis and all lung nodules were R0 resections. Patients operated on by consultants and trainees had similar preoperative profiles and postoperative outcomes, except that those operated on by trainees used patient-controlled analgesia significantly longer (1.8 ± 1.48 vs. 1 ± 0.48 days; p = 0.03).

CONCLUSION

Single-port video-assisted thoracic surgery can be performed and reproduced well without compromising outcomes. It is considered aesthetically better and may reduce analgesic requirements, but it might not reduce hospital stay.

Improving integration for integrated coastal zone management: an eight country study

Integrated coastal zone management (ICZM) is a widely accepted approach for sustainable management of the coastal environment. ICZM emphasizes integration across sectors, levels of government, uses, stakeholders, and spatial and temporal scales. While improving integration is central to progress in ICZM, the role of and the achievement of integration remain understudied. To further study these two points, our research analyzes the performance of specific mechanisms used to support ICZM in eight countries (Belgium, India, Israel, Italy, Portugal, Sweden, UK, and Vietnam). The assessment is based on a qualitative comparative analysis conducted through the use of two surveys. It focuses on five ICZM mechanisms (environmental impact assessment; planning hierarchy; setback lines; marine spatial planning, and regulatory commission) and their role in improving integration. Our findings indicate that certain mechanisms enhance specific types of integration more effectively than others. Environmental impact assessment enhances science-policy integration and can be useful to integrate knowledge across sectors. Planning hierarchy and regulatory commissions are effective mechanisms to integrate policies across government levels, with the latter also promoting public-government integration. Setback lines can be applied to enhance integration across landscape units. Marine spatial planning is a multi-faceted mechanism with the potential to promote all types of integration. Policy-makers should adopt the mechanisms that are suited to the type of integration needed. Results of this study also contribute to evidence-based coastal management by identifying the most common impediments related to the mechanisms of integration in the eight studied countries.

The role of surgery in patients with advanced gynaecological cancers participating in phase I clinical trials

OBJECTIVE

While gynaecological cancer patients who participate in Phase I clinical trials are not routinely considered for elective surgery because of a short life expectancy, this should not be overlooked in carefully selected responding patients.

METHODS/RESULTS

We describe two cases of patients with different gynaecological cancers, who received treatment within separate phase I trials, and who then proceeded to surgical resection of their cancers, resulting in complete remission.

CONCLUSION

Surgery, when feasible, should be taken into consideration as a potential management option, even when patients are receiving treatment within a phase I trial.

Pleuropancreatic fistulae: specialist center management

BACKGROUND AND AIMS

Internal pancreatic fistulae are uncommon sequelae of severe acute pancreatitis. Due to their low prevalence, experience in the management of this condition remains sparse outside specialist centers and management remains controversial. We report our experience with pleuropancreatic fistulae (PPF).

PATIENTS

Six patients (three males, median age 34 years [range, 32-74 years]) with PPF were managed in our unit over a 24-month period from April 2006 to April 2008. The etiology of pancreatitis was alcohol (four), gallstones (one), and unknown cause (one). All patients had documented pleural effusions with amylase content >1,000 iu/dl.

RESULTS

All patients underwent computerized tomography (CT) and magnetic resonance imaging (MRI) cross-sectional scanning to identify the site of ductal disruption. CT alone was able to identify the disruption in four cases and a combination of CT and MRI localized the ductal disruption in all patients. Five of six patients required ERCP and placement of a pancreatic duct (PD) stent. No patient required pancreatic surgery and all patients remain well at a median follow up of 39 weeks.

CONCLUSION

Pleuropancreatic fistulae can present a challenging diagnostic dilemma. A multi-disciplinary approach addressing nutritional support and endotherapy allows successful non-operative resolution within specialist units.

The impact of caudate lobe involvement after hepatic resection for colorectal metastases

BACKGROUND

Hepatic resections involving the caudate lobe are technically challenging with results from some centers indicating inferior outcomes. We assessed outcomes following hepatic resection for colorectal metastases involving the caudate lobe in a tertiary care center.

METHODS

Operative and oncological data from a prospectively maintained database were analyzed on 687 patients undergoing hepatic resection for colorectal metastases between 1993 and 2006. Patients were analyzed as those with caudate lobe metastases (CLM) and compared with those without caudate lobe involvement (NCLM).

RESULTS

Fifty-two of 687 patients had metastases involving the caudate lobe (8%). Patients with caudate lobe involvement were more likely to require an extended hepatic resection (75% vs 27%, P=0.001), perioperative blood transfusion (29% vs 14%, P=0.002), have a positive resection margin (57% vs 32%, P=0.001) and stay longer in hospital (12 vs 8 days, P=0.001). There was no difference in the complication rates (37% vs 29%) or 30-day mortality between the two groups (2% vs 1%). The median disease free (20 months vs 21 months), and cancer specific survival (42 months vs 59 months) were also similar in the CLM and NCLM groups.

CONCLUSIONS

Although caudate lobe involvement adds to the technical complexity of hepatic resection, these patients can be offered long term survival, similar to other patients with hepatic metastases from colorectal cancer.

Lisinopril-induced acute pancreatitis

Drugs are an uncommon but well-recognised cause of acute pancreatitis and new agents of drug-induced pancreatitis continue to be reported. We describe only the 10th reported case of lisinopril-induced pancreatitis in a young female patient.

Complete pathological response following down-staging chemoradiation in locally advanced pancreatic cancer: Challenging the boundaries

Pancreatic cancer is an aggressive malignancy, relatively resistant to chemotherapy and radiotherapy, which usually presents late. Disease specific mortality approaches unity despite advances in adjuvant therapy. We present the first reported case of complete pathological response following neoadjuvant therapy in a locally advanced pancreatic adenocarcinoma.

Rectovaginal fistula in Crohn's disease

PURPOSE

Crohn's disease is characterized by transmural bowel inflammation and a tendency to form fistulas with adjacent structures. Several different fistulas have been described: enterocutaneous, enteroenteric, enterovesical, enterovaginal, and perineal. Rectovaginal fistulas are difficult to treat despite multimodal therapy. This study was designed to review the current strategic options to best manage this condition.

METHODS

We reviewed the English-language literature from 1966 to 2006, using PUBMED, targeting Crohn's disease involving vagina using key words "rectovaginal fistula and CD," "anovaginal fistula and CD," "anovaginal fistula," and "rectovaginal fistula." We excluded the involvement of the vagina from a pouch after a proctectomy. A total of 776 articles were found; 206 articles were identified and judged as being relevant on the basis of title-related articles and links were reviewed. Fifty-three articles were selected after reading the abstract or full manuscript.

RESULTS

The management of rectovaginal fistula, representing 9 percent of all fistulas, remains a challenge in the setting of Crohn's disease. Medical treatments are not favorable with low rates of long-term symptomatic control and unacceptable high rates of recurrence. Several novel and new surgical techniques have been described, and rectal advancement flap, in selected patients, seems to have the most successful results.

CONCLUSIONS

The management of rectovaginal fistula of Crohn's origin should involve both gastroenterologists and coloproctologists, with the best surgical results being achieved in patients receiving optimum medical therapy. More focused studies targeting these patients with the use of combined medical and surgical therapy are necessary.

Refining the technique of hepatic parenchymal transection: combined saline-linked radiofrequency precoagulation and ultrasonic aspiration

BACKGROUND/AIMS

With recognition of its benefits, there has been a trend towards minimizing blood loss during hepatic parenchymal transection but no one technique has been shown to be superior to another. We analyzed our experience with using a novel combined technique of saline-linked radiofrequency precoagulation and ultrasonic aspiration for hepatic parenchymal transection.

METHODOLOGY

This combined technique was used in 12 patients for parenchymal transection for metastatic hepatic disease and data was collected prospectively. Total blood loss, bile leaks, parenchymal transection time, hepatic pedicle clamp requirement and 30-day mortality were used as outcome measures.

RESULTS

Four minor and 8 major hepatic resections were performed in twelve patients of who two underwent a synchronous resection of the rectum. The median blood loss was 525 mL (IQR 312.5-1150) in these patients who had a median postoperative stay of 7 days (IQR 7-14). The median parenchymal transection time was 120 minutes (IQR 100-153.75). No patient required portal triad clamping at anytime and there was no mortality.

CONCLUSIONS

Combined technique of saline-link radiofrequency ablation and ultrasonic aspiration appears to be comparable to other techniques and should be considered as an alternative.

Lessons to be learned: a case study approach. Lateral aberrant thyroid tissue: is it always malignant?

Traditionally 'lateral aberrant thyroid' tissue present in cervical lymph nodes in the face of a clinically normal thyroid gland is held to be a metastasis from an occult primary thyroid carcinoma. A patient in whom follicular thyroid tissue was found in a lymph node lateral to the carotid sheath in the presence of a thyroid gland which was histologically free of cancer is herewith presented.

Trends in the surgical management of Klatskin tumours

Outcomes are improving

Single center experience of laparoscopic vs. open resection for gastrointestinal stromal tumors of the stomach

BACKGROUND/AIMS

With better understanding of disease biology and technological advances, an increasing number of gastric gastrointestinal stromal tumors (GISTs) are being resected laparoscopically. We assessed our management of gastric GISTs in our institution.

METHODOLOGY

Prospectively collected data from 13 patients who underwent surgery for gastric gastrointestinal stromal tumors over an 18-month period were analyzed with respect to operative and oncological outcomes. Seven patients underwent open resection and 6 patients had laparoscopic resection.

RESULTS

The tumors were evenly distributed in both groups in whom the median age was 68 years in the open group vs. 70 years in the laparoscopic group. The median operating time was 132 min in the open group and 110 min in the laparoscopic group and patients who had a laparoscopic resection had a shorter hospital stay (4 days versus 11 days). Patients in the open group had a larger tumor the patients in the laparoscopic group (11.5 x 6 x 4 cm vs. 5 x 4 x 3 cm). No patient had evidence of recurrence at median follow-up of 9 months.

CONCLUSIONS

Patients with small gastric GISTs can be safely resected with a laparoscopic approach, offering a quicker operation and shorter hospital stay. A laparoscopic approach does not alter risk of early local or distant recurrence.

Boerhaave's syndrome: Diagnosis and surgical management

Spontaneous oesophageal perforation, or Boerhaave's syndrome, represents barogenic oesophageal injury. Patients don't always present with classical features and treatment may be delayed. Various approaches and strategies have been described but, despite advances in surgery and critical care, the condition continues to carry a high morbidity and mortality. Primary repair may be undertaken in patients who present within 24 hours of perforation and remains the gold standard. Increasingly, this strategy is being adopted for patients who present later with similar mortality rates. Diversion with exclusion and resectional procedures may be undertaken when repair is not possible.

The impact of staging laparoscopy prior to hepatic resection for colorectal metastases

AIMS

To evaluate the role of routine laparoscopy as a staging modality prior to laparotomy and hepatic resection for metastatic colorectal cancer.

METHODS

Prospectively collected data were analysed from a database. In the first half of the series patients underwent selective laparoscopy before proceeding to laparotomy and in the second part of the series laparoscopy was used routinely. Patients undergoing laparotomy directly were analysed in Group 1 and those having laparoscopy before laparotomy in Group 2. The ability of laparoscopy to pick up unresectable and extrahepatic disease, resectability rate and open and close laparotomy rate were recorded.

RESULTS

Of the 284 patients, 74 were in Group 1 (no laparoscopy) and 210 in Group 2 (laparoscopy as standard). The resectability rate was 81% in Group 1 and 87% in Group 2. The open and close laparotomy rate was 19% and 8%, respectively (p=0.025). In Group 2 alone, laparoscopy identified 39% of unresectable disease and prevented an open and close procedure.

CONCLUSIONS

Routine use of staging laparoscopy increases the resectability rate and reduces the inoperability rate in these patients.

Proprioceptive guidance of saccades in eye-hand coordination

The saccade generator updates memorized target representations for saccades during eye and head movements. Here, we tested if proprioceptive feedback from the arm can also update handheld object locations for saccades, and what intrinsic coordinate system(s) is used in this transformation. We measured radial saccades beginning from a central light-emitting diode to 16 target locations arranged peripherally in eight directions and two eccentricities on a horizontal plane in front of subjects. Target locations were either indicated 1) by a visual flash, 2) by the subject actively moving the handheld central target to a peripheral location, 3) by the experimenter passively moving the subject's hand, or 4) through a combination of the above proprioceptive and visual stimuli. Saccade direction was relatively accurate, but subjects showed task-dependent systematic overshoots and variable errors in radial amplitude. Visually guided saccades showed the smallest overshoot, followed by saccades guided by both vision and proprioception, whereas proprioceptively guided saccades showed the largest overshoot. In most tasks, the overall distribution of saccade endpoints was shifted and expanded in a gaze- or head-centered cardinal coordinate system. However, the active proprioception task produced a tilted pattern of errors, apparently weighted toward a limb-centered coordinate system. This suggests the saccade generator receives an efference copy of the arm movement command but fails to compensate for the arm's inertia-related directional anisotropy. Thus the saccade system is able to transform hand-centered somatosensory signals into oculomotor coordinates and combine somatosensory signals with visual inputs, but it seems to have a poorly calibrated internal model of limb properties.

Optic ataxia errors depend on remapped, not viewed, target location

Optic ataxia is a disorder associated with posterior parietal lobe lesions, in which visually guided reaching errors typically occur for peripheral targets. It has been assumed that these errors are related to a faulty sensorimotor transformation of inputs from the 'ataxic visual field'. However, we show here that the errors observed in the contralesional field in optic ataxia depend on a dynamic gaze-centered internal representation of reach space.

Spontaneous splenic rupture--a rare complication of amyloidosis

We present a case of spontaneous rupture of the spleen, an uncommon complication of systemic amyloidosis. Amyloid deposition leading to capsular distension and increased vascular fragility is thought to predispose the spleen to rupture spontaneously.

Ocular kinematics and eye-hand coordination

Eye-hand coordination is complicated by the fact that the eyes are constantly in motion relative to the head. This poses problems in interpreting the spatial information gathered from the retinas and using this to guide hand motion. In particular, eye-centered visual information must somehow be spatially updated across eye movements to be useful for future actions, and these representations must then be transformed into commands appropriate for arm motion. In this review, we present evidence that early visuomotor representations for arm movement are remapped relative to the gaze direction during each saccade. We find that this mechanism holds for targets in both far and near visual space. We then show how the brain incorporates the three-dimensional, rotary geometry of the eyes when interpreting retinal images and transforming these into commands for arm movement. Next, we explore the possibility that hand-eye alignment is optimized for the eye with the best field of view. Finally, we describe how head orientation influences the linkage between oculocentric visual frames and bodycentric motor frames. These findings are framed in terms of our 'conversion-on-demand' model, in which only those representations selected for action are put through the complex visuomotor transformations required for interaction with objects in personal space, thus providing a virtual on-line map of visuomotor space.