Contribution of systemic factors on macular vessel density: a sex-specific population-based study.

PURPOSE: To evaluate the influence of systemic factors on macular vessel density in quantitative Optical Coherence Tomography Angiography (OCTA) by sex. STUDY DESIGN: A cross-sectional study. METHODS: A total of 2018 adults were recruited in this study. Participants were excluded (n=964) due to missing data, eye-related problems, or low OCTA scan quality. Macular vessel densities were measured with OCTA using split-spectrum amplitude decorrelation angiography algorithm. Only the data from the right eyes were selected for analysis. Multivariable linear regression analysis was performed to determine the associations between macular vessel density and obesity-related systemic factors in each gender group. RESULTS: The right eyes of 1054 participants (59.6% women) were enrolled. Men had significantly higher obesity parameters and associated risk factors. In multivariable linear regression analysis in men, older age and type 2 diabetes mellitus were independently associated with lower superficial retinal vessel density (ß = -0.37, p = 0.002; ß = -1.22, p = 0.03) and deep retinal vessel density, respectively (ß = -0.66, p < 0.001; ß = -1.76, p = 0.02); positive association was also observed between body mass index (BMI) and superficial retinal vessel density (ß = 0.56, p = 0.02). In women, only higher systolic blood pressure was independently associated with a lower deep retinal vessel density (ß = -0.50, p = 0.003). CONCLUSIONS: This large cross-sectional study shows that older age and type 2 diabetes mellitus are associated with lower superficial and deep retinal capillary vessel density in men. This may help clinicians better understand how systemic factors influence retinal vessel density in different genders and future studies can ascertain more potential sex differences.

The great pretender-Bell's palsy secondary to SARS-CoV-2?

This case series highlights a possible association between isolated facial nerve palsy and SARS-CoV-2. Caution should be exercised in the use of steroids in patients with COVID-19 as its impact is still not well established.

Bipolar Hemiarthroplasty and Parathyroidectomy at the Same Setting for Fragility Fractures Secondary to Renal Bone Disease.

BACKGROUND: From 1980s to the new millennium, the number of patients surviving with end stage renal disease (ESRD) has increased by 3 fold. This is driven by early detection of primordial and primary risk factors, state of the art renal replacement therapy and ease of public access to healthcare. Renal osteodystrophy (RO) is a metabolic bone disease causing significant morbidity in patients with ESRD, in particular fragility fractures. In this case series, we present the surgical management of 3 ESRD patients with pathological fractures of the neck of femur (NOF) and surgical treatment (parathyroidectomy) of tertiary hyperparathyroidism of ESRD patients in the same surgical setting. Up to date there has been no reports on bipolar hemiarthroplasty and total parathyroidectomy implemented in the same operative setting. METHODS: We present 3 cases, 2 males and a female with an average age of 48 years. All patients presented with no trauma or minimal trauma. With high index of suspicion and after confirming the diagnosis with advanced imaging, the patients underwent cemented modular hemiarthroplasty with posterior approach. Parathyroidectomy was sequentially performed to address the tertiary hyperparathyroidism at the same setting. We followed them for 48 months. RESULTS: At 48-month follow up, all the patients were at their pre-morbid ambulatory status and there were no major complications. They did not need any revision surgery or re-operation either for the hemiarthroplasty surgery or the parathyroidectomy during the follow up period. CONCLUSION: To avoid diagnostic pitfalls in this group of patients we recommend MRIs of both hips in patients complaining of unilateral hip pain even when the roentgenograms are clear of fractures. Total parathyroidectomy at the same setting with the bipolar hemi-arthroplasty is a safe combination. This reduces the anaesthesia risk, the recovery time as well as the equilibrium time for calcium homeostasis.

Impact of the COVID-19 pandemic on sports and exercise.

BACKGROUND: COVID-19 is a droplet-transmitted potentially fatal coronavirus pandemic affecting the world in 2020. The WHO recommended social distancing and human-to-human contact was discouraged to control the transmission. It has put many countries in a state of lockdown and sporting events (including the 2020 Olympics) have been affected. Participation in sports and exercise, typically regarded as healthy activities, were also debated. The local professional football leagues, governed by the Hong Kong Football Association, ultimately postponed all matches after much deliberation on the transmission risk for the spectators and on-field players. Large spectating crowds are well-known to be infectious hazards, but the infection risk for on-field players is less recognized. Aside from watching professionals exercise, many people opted to hike in the countryside during the weekends to avoid city crowds. This led to a widespread discussion on the issue of wearing a facemask during outdoor activities. METHODS: A small sample of video footage of professional football players were analysed to track each players' time of close body contact and frequency of infection-risky behaviours to investigate the risk of virus transmission during football games.To investigate the physiological effect of wearing a facemask during exercise, we conducted a controlled laboratory, within-subject, repeated measures study of 23 healthy volunteers of various sporting backgrounds. They underwent graded treadmill walking at 4 km per hour for 6 min with and without wearing a surgical mask in a randomized order with sufficient resting time in between trials. The heart rate and the rate of perceived exertion (RPE) were recorded. RESULTS: In a 90 min match, the average duration of close contact between professional football players was 19 min and each player performed an average of 52 episodes of infection-risky behaviours. The heart rate and RPE of subjects wearing a facemask was 128 beats per minute and 12.7 respectively. In those without a facemask, the results were a heart rate of 124 beats per minute and a RPE of 10.8. CONCLUSION: This suggests that the infection risk was high for the players, even without spectators. The laboratory study to investigate the physiological effect of wearing a facemask found that it significantly elevated heart rate and perceived exertion. Those participating in exercise need to be aware that facemasks increase the physiological burden of the body, especially in those with multiple underlying comorbidities. Elite athletes, especially those training for the upcoming Olympics, need to balance and reschedule their training regime to balance the risk of deconditioning versus the risk of infection. The multiple infection-control measures imposed by the Hong Kong national team training centre was highlighted to help strike this balance. Amidst a global pandemic affecting millions; staying active is good, but staying safe is paramount.

Development of an enhanced acute care surgery service in response to the COVID-19 global pandemic.

BACKGROUND: As the COVID-19 pandemic sweeps across the world, healthcare departments must adapt to meet the challenges of service provision and staff/patient protection. Unlike elective surgery, acute care surgery (ACS) workloads cannot be artificially reduced providing a unique challenge for administrators to balance healthcare resources between the COVID-19 surge and regular patient admissions. METHODS: An enhanced ACS (eACS) model of care is described with the aim of limiting COVID-19 healthcare worker and patient cross-infection as well as providing 24/7 management of emergency general surgical (GS) and trauma patients. The eACS service comprised 5 independent teams covering a rolling 1:5 24-hr call. Attempts to completely separate eACS teams and patients from the elective side were made. The service was compared to the existing ACS service in terms of clinical and efficiency outcomes. Finally, a survey of staff attitudes towards these changes, concerns regarding COVID-19 and psychological well-being was assessed. RESULTS: There were no staff/patient COVID-19 cross-infections. Compared to the ACS service, eACS patients had reduced overall length of stay (2-days), time spent in the Emergency Room (46 min) and time from surgery to discharge (2.4-hours). The eACS model of care saved financial resources and bed-days for the organisation. The changes were well received by team-members who also felt that their safety was prioritised. CONCLUSION: In healthcare systems not overwhelmed by COVID-19, an eACS model may assist in preserving psychological well-being for healthcare staff whilst providing 24/7 care for emergency GS and trauma patients.

NOR-1 distinguishes acinic cell carcinoma from its mimics on fine-needle aspiration biopsy specimens.

Acinic cell carcinoma of the salivary gland (ACC-SG) is characterized by a recurrent chromosomal rearrangement (t(4; 9)(q13; q31)) that upregulates the transcription factor NR4A3. Studies conducted on formalin-fixed paraffin-embedded (FFPE) tissue have found that nuclear expression of a monoclonal antibody NR4A3 (NOR-1) is a sensitive and specific diagnostic marker for ACC-SG. The aims of this study were to evaluate the performance of the NOR-1 antibody and to compare its utility in separating ACC-SG from its mimics on cytology cell block specimens. Cell blocks were obtained from 70 fine-needle aspiration specimens from multiple institutional archives over a 7-year period (2013-2019). These included 10 cases of conventional low-grade ACC-SG, 1 case of dedifferentiated high-grade ACC-SG, and 59 cases of non-ACC-SG. An automated immunohistochemistry system (Bond-III, Leica) was used for the detection of NR4A3, using the commercially available antibody NOR-1 (sc-393902 [H-7], Santa Cruz Biotechnology Inc.). Optimization of the antibody on the cell blocks was successfully completed by increasing the titer from 1:100 (suggested titer for FFPE specimens) to 1:30. Distinct nuclear reactivity was observed in all 11 cases of ACC-SG (10 of 11 with 3+ diffuse nuclear positivity and 1 case with 2+ focal reactivity). Expression of NR4A3 was absent in all non-ACC-SG cases in the cell blocks. Application of the NOR-1 immunohistochemical staining in fine-needle aspirates of salivary gland tumors for which ACC-SG is a diagnostic consideration successfully distinguishes ACC-SG from its cytologic mimics and provides an early opportunity for oncologic intervention.

Randomized control trial comparing an Alvarado Score-based management algorithm and current best practice in the evaluation of suspected appendicitis.

BACKGROUND: An objective algorithm for the management of suspected appendicitis guided by the Alvarado Score had previously been proposed. This algorithm was expected to reduce computed tomography (CT) utilization without compromising the negative appendectomy rate. This study attempts to validate the proposed algorithm in a randomized control trial. METHODS: A randomized control trial comparing the management of suspected acute appendicitis using the proposed algorithm compared to current best practice, with the rate of CT utilization as the primary outcome of interest. Secondary outcomes included the percentage of missed diagnosis, negative appendectomies, length of stay in days, and overall cost of stay in dollars. RESULTS: One hundred sixty patients were randomized. Characteristics such as age, ethnic group, American Society of Anesthesiologist score, white cell count, and symptom duration were similar between the two groups. The overall CT utilization rate of the intervention arm and the usual care arm were similar (93.7% vs 92.5%, p = 0.999). There were no differences in terms of negative appendectomy rate, length of stay, and cost of stay between the intervention arm as compared to the usual care arm (p = 0.926, p = 0.705, and p = 0.886, respectively). Among patients evaluated with CT, 75% (112 out of 149) revealed diagnoses for the presenting symptoms. CONCLUSION: The proposed AS-based management algorithm did not reduce the CT utilization rate. Outcomes such as missed diagnoses, negative appendectomy rates, length of stay, and cost of stay were also largely similar. CT utilization was prevalent as 93% of the study cohort was evaluated by CT scan. TRIAL REGISTRATION: The study has been registered at ClinicalTrials.gov (NCT03324165, Registered October 27 2017).

Hungry bone syndrome after parathyroidectomy in end-stage renal disease patients: review of an alkaline phosphatase-based treatment protocol.

AIM: Hyperparathyroidism in chronic kidney disease-mineral and bone disorder is associated with significant morbidity and mortality. Parathyroidectomy is widely carried out as treatment despite complications such as hypocalcaemia post-surgery. Our centre has been using an ALP-based protocol to replace calcium postoperatively to prevent hypocalcaemia. We aim to describe and audit our calcium replacement protocol post-parathyroidectomy METHODS: We, retrospectively, analyse 167 end-stage kidney disease patients who had parathyroidectomy with auto-implantation in Singapore General Hospital between January 2008 and December 2013. Their calcium replacement postoperatively was initiated upon patient arrival back in ward on the same day of surgery based on their pre-op ALP prior to occurrence of hypocalcaemia. Patient demographics, surgical and laboratory parameters were reviewed from medical records. Changes in calcium postoperatively were reported to look for incidence of calcium derangement. RESULTS: Mean calcium levels between pre-operation day and post-operation day 7 ranged from 2.31 to 2.70 mmol/L. Decline in serum calcium was common in all patients prior to starting calcium replacement. Eighteen patients (10.9%) experienced hypocalcaemia immediately post-operation prior to commencement of IV calcium replacement. Patients with immediate post-operation hypocalcaemia had lower pre-operation calcium but higher pre-operation alkaline phosphatase (ALP) and pre-operation intact parathyroid hormone. Hypercalcaemia is common likely from aggressive IV calcium replacement using the protocol. The average length of stay for patients prior to calcium stabilization and discharge was 9 days. CONCLUSION: Implementation of an ALP-based prophylactic calcium replacement protocol with daily serum calcium monitoring can ameliorate severe hypocalcaemia post-parathyroidectomy.

Comparing the Utility and Surgical Outcomes of Harmonic Focus Ultrasonic Scalpel with Ligasure Small Jaw Bipolar Device in Thyroidectomies: A Prospective Randomized Controlled Trial.

BACKGROUND: Ultrasonic or bipolar radiofrequency energy devices are routinely used for dissection and hemostasis during thyroidectomy. We report a single-center, prospective, randomized controlled trial comparing the utility and outcomes of Harmonic Focus, an ultrasonic coagulating shear device (UCSD), versus Ligasure Small Jaw, an electrothermal bipolar vessel sealer (EBVS) in thyroidectomy (NCT01765686). METHODS: Between December 2012 to January 2016, eligible patients were randomized to undergo hemithyroidectomy using either a UCSD or an EBVS. The primary outcome was duration of surgery. Secondary outcomes included blood loss, postoperative complications, ease of device use, ease of device set-up, vocal cord function, postoperative wound drainage, pain score, and adverse events. RESULTS: Of 110 patients assessed for eligibility, 100 were randomly allocated (UCSD: 49 patients; EBVS: 51 patients) and analyzed by intention-to-treat. There were no differences in specimen delivery time, total duration of surgery, wound drainage, and adverse events between the two groups. The UCSD group had a greater proportion of patients with higher postoperative pain scores in the first 72 h (8.1% vs. 2.0%, p = 0.043). Surgeons reported greater ease of use for the UCSD (49% vs. 27%; p = 0.005), while operating room staff favored the EBVS (60% vs. 33%, p = 0.005). CONCLUSIONS: Energy devices are equally effective in reducing thyroidectomy operative times, with no differences in the duration of surgery, drainage, or adverse events. Use of the UCSD was associated with higher postoperative pain scores, but was favored by the surgeons, likely due to the ability to perform fine dissection with the device itself.

A Practical Multi-Sensor Cooling Demand Estimation Approach Based on Visual, Indoor and Outdoor Information Sensing.

The operating efficiency of heating, ventilation and air conditioning (HVAC) system is critical for building energy performance. Demand-based control is an efficient HVAC operating strategy, which can provide an appropriate level of HVAC services based on the recognition of actual cooling "demand." The cooling demand primarily relies on the accurate detection of occupancy. The current researches of demand-based HVAC control tend to detect the occupant count using cameras or other sensors, which often impose high computation and costs with limited real-life applications. Instead of detecting the occupant count, this paper proposes to detect the occupancy density. The occupancy density (estimated by image foreground moving pixels) together with the indoor and outdoor information (acquired from existing sensors) are used as inputs to an artificial neural network model for cooling demand estimation. Experiments have been implemented in a university design studio. Results show that, by adding the occupancy density, the cooling demand estimation error is greatly reduced by 67.4% and the R value is improved from 0.75 to 0.96. The proposed approach also features low-cost, computationally efficient, privacy-friendly and easily implementable. It shows good application potentials and can be readily incorporated into existing building management systems for improving energy efficiency.

Invasive and non-invasive assessment of portal hypertension.

Portal hypertension is the central driver of complications in patients with chronic liver diseases and cirrhosis. The diagnosis of portal hypertension has important prognostic and clinical implications. In particular, screening for varices in patients with portal hypertension can effectively reduce the morbidity and mortality of variceal bleeding. In this article, we review the invasive and non-invasive methods to assess portal hypertension. Hepatic venous pressure gradient remains the gold standard to measure portal pressure but is invasive and seldom performed outside expert centers and research settings. In recent years, a number of non-invasive tests of fibrosis have shown good correlation with liver histology. They also show promise in identifying patients with portal hypertension and large varices. As a result, the latest Baveno VI consensus guidelines endorse the use of liver stiffness measurement by transient elastography and platelet count as initial assessment to select patients for varices screening. On the other hand, the performance of non-invasive tests in assessing the response to non-selective beta-blockers or transjugular intrahepatic portosystemic shunting is either suboptimal or unclear.

Leachate breakthrough mechanism and key pollutant indicator of municipal solid waste landfill barrier systems: Centrifuge and numerical modeling approach.

Groundwater pollution by leachate leakage is one of the most common environmental hazards associated with municipal solid waste (MSW) landfill sites. However, landfill leachate contains a large variety of pollutants with widely different concentrations and biotoxicity. Thus, selecting leachate pollutant indicators and levels for identifying breakthrough of barrier systems are key factors in assessing their breakthrough times. This study investigated the transport behavior of leachate pollutants through landfill barrier systems using centrifuge tests and numerical modeling. The overall objective of this study is to investigate breakthrough mechanism to facilitate the establishment of a consistent pollutant threshold concentration for use as a groundwater pollution alert. The specific objective of the study is to identify which pollutant and breakthrough threshold concentration should be used as an indicator in the transport of multiple pollutants through a landfill barrier system. The threshold concentration from the Chinese groundwater quality standards was used in the analysis of the properties of leachates from many landfill sites in China. The time for the chemical oxygen demand (COD) to reach the breakthrough threshold concentration at the bottom of a 2m compacted clay liner was 1.51years according to centrifuge tests, and 1.81years according to numerical modeling. The COD breakthrough times for single and double composite liners were within the range of 16 and 36.58years. Of all the pollutants, COD was found to consistently reach the breakthrough threshold first. Therefore, COD can be selected as the key indicator for pollution alerts and used to assess the environmental risk posed by MSW landfill sites.

Effect of Hydrochloric Acid Decalcification on Expression Pattern of Prognostic Markers in Invasive Breast Carcinomas.

CONTEXT: In the United States, it is estimated that 100,000 people are living with metastatic breast cancer (BC) with bone representing the most common site of involvement. However, patients with isolated bone metastasis at presentation may have a longer survival. Therapeutic options for BC bone metastases often include systemic anticancer therapy (endocrine, chemotherapy, monoclonal antibodies, and/or other targeted therapies), which is largely dependent on the immunohistochemical (IHC) repertoire of the cancer for the prognostic markers [estrogen (ER) and progesterone receptors (PR), Ki-67, p53, and Her-2/neu] at its osseous metastatic site. Traditionally, specimens obtained from the bone metastasis require decalcification, which may affect the immunoreactivity of these prognostic markers. To the best of our knowledge, limited studies describe the effect of decalcification on immunoexpression of the above-mentioned markers. A detailed illustration of the effect of decalcification on BC specimens in a real-time manner is lacking in the literature. OBJECTIVE: Herein, we sought to determine the impact of decalcification on the IHC expression pattern of the above listed markers on BC tissue following decalcification. DESIGN: After Institutional Review Board approval, sections from the residual tumor specimens were collected prospectively from 15 BC excision specimens and 1 curetting from a BC bone metastasis. The sections (3 to 6 sections/case) for decalcification were collected following routine submission for pathologic evaluation. The sections were subjected to hydrochloric acid (HCl)-based Decal Stat decalcifying solution for 2, 12, 18, and 24 hours in each case. IHC studies for ER, PR, Ki-67, p53, and Her-2/neu were performed on 1 representative section of the regularly processed tumor block and 1 decalcified tumor block from each time point. Scoring of ER and PR were performed according to the Allred scoring system. Scoring of Her-2/neu was performed according to CAP/ASCO guidelines. RESULTS: The tumors comprised 11 grade 3 invasive ductal carcinomas, 2 grade 2 invasive ductal carcinomas, 2 grade 3 invasive lobular carcinoma, and 1 metastatic BC to bone. Nine cases showed Allred score 8 for ER, 1 case showed Allred score 4, 1 case showed Allred score 2, and the remaining 5 were ER negative. For PR, 1 showed Allred score 8, 2 Allred score 7, 4 Allred score 6, 1 each Allred score 5 and score 2 with the remainder negative for PR. Ki-67 ranged from 5% to 95%. Five cases showed p53 overexpression ranging from 35% to 95%. Five cases each showed 3+, 6 cases showed 2+ Her-2/neu, 3 cases showed 1+ Her-2/neu, and the remaining 2 were negative. All specimens demonstrated decline in ER, PR, Ki-67, and p53 immunoreactivity after 2 hours of decalcification, with additional decline up to 24 hours. The most significant declines in immunoreactivity occurred with Ki-67 and p53. Most of the Her-2/neu cases with an equivocal score declined to zero after 24 hours of decalcification. However, 3 out of 11 cases showing Her-2/neu overexpression remained at the baseline scoring even after extended (24 h) decalcification. CONCLUSIONS: Our results demonstrated that the decalcification process affects the immunoreactivity of the prognostic BC markers. There is progressive loss of reactivity at 2 hours and beyond for markers with lower degrees of expression. In addition, heterogeneity in marker distribution progressed from diffuse to more focal beyond 1 hour.

Histological severity and clinical outcomes of nonalcoholic fatty liver disease in nonobese patients.

Although nonalcoholic fatty liver disease (NAFLD) is closely linked to obesity, around 10%-20% of nonobese Americans and Asians still develop NAFLD. Data on this special group are limited. We therefore studied the severity and clinical outcomes of nonobese NAFLD patients. Consecutive NAFLD patients who underwent liver biopsy were prospectively recruited. We used the NASH Clinical Research Network system to score the histology. The Asian body mass index cutoff of 25 kg/m2 was used to define nonobese NAFLD. Among 307 recruited NAFLD patients, 72 (23.5%) were nonobese. Compared to obese patients, nonobese patients had lower NAFLD activity score (3.3 ± 1.3 vs. 3.8 ± 1.2; P = 0.019), mainly contributed by steatosis (1.7 ± 0.8 vs. 2.0 ± 0.8; P = 0.014) and presence of hepatocyte ballooning (60.9% vs. 73.4%; P = 0.045). Similarly, nonobese patients had lower fibrosis stage (1.3 ± 1.5 vs. 1.7 ± 1.4; P = 0.004), serum cytokeratin-18 fragments (283 vs. 404 U/L; P < 0.001) and liver stiffness measurement by transient elastography (6.3 vs. 8.6 kilopascals; P < 0.001). By multivariate analysis in nonobese patients, only elevated serum triglyceride level was independently associated with higher NAFLD activity score (adjusted odds ratio [OR], 1.644; P = 0.021), whereas elevated creatinine level was the only factor associated with advanced fibrosis (adjusted OR, 1.044; P = 0.025). After a median follow-up of 49 months, 6 patients died, 2 developed hepatocellular carcinoma, and 1 had liver failure, all of whom were in the obese group. CONCLUSION: Nonobese NAFLD patients tend to have less-severe disease and may have a better prognosis than obese patients. Hypertriglyceridemia and higher creatinine are the key factors associated with advanced liver disease in nonobese patients. (Hepatology 2017;65:54-64).

Application of the combined FibroMeter vibration-controlled transient elastography algorithm in Chinese patients with non-alcoholic fatty liver disease.

BACKGROUND AND AIM: The FibroMeter vibration-controlled transient elastography (FM VCTE) is a new formula combining the serum test FM and liver stiffness measurement (LSM) by VCTE. We tested the accuracy and utility of FM VCTE for fibrosis staging in patients with non-alcoholic fatty liver disease (NAFLD). METHODS: Two hundred fifteen NAFLD patients with LSM, FM NAFLD, FM VCTE, and other serum tests (aspartate aminotransferase-to-platelet ratio index, fibrosis-4 index, BARD score, NAFLD fibrosis score, and aspartate aminotransferase-to-alanine aminotransferase ratio) performed 1 day before liver biopsy were evaluated. RESULTS: Sixty-nine (32.1%) and 43 (20.0%) patients had F2-4 and F3-4, respectively. LSM had higher diagnostic accuracy (area under receiver-operating characteristics curves [AUROC] 0.851 for F2-4, 0.940 for F3-4; Obuchowski index 0.937 ± 0.007) than all evaluated serum tests, while FM NAFLD was the most accurate serum test (AUROC 0.775 and 0.774; Obuchowski index 0.891 ± 0.013). FM VCTE had similar accuracy to LSM (AUROC 0.855 and 0.901; Obuchowski index 0.927 ± 0.009). LSM had excellent negative predictive values of 92.4% and 99.2% to exclude F2-4 and F3-4, but the positive predictive values (PPV) were only 71.4% and 61.0%, respectively. In patients with high LSM, the use of FM VCTE improved the PPV from 71.4% to 84.4% for F2-4 and from 61.0% to 88.9% for F3-4. Liver biopsy could be spared in around 50-65% of patients. CONCLUSIONS: Liver stiffness measurement alone can confidently exclude significant and advanced fibrosis in NAFLD patients. Using FM VCTE in patients with high liver stiffness can increase the positive predictive value to rule in F2-4 and F3-4.

Prevalence and Severity of Nonalcoholic Fatty Liver Disease in Non-Obese Patients: A Population Study Using Proton-Magnetic Resonance Spectroscopy.

OBJECTIVES: Some studies suggest that non-obese patients with nonalcoholic fatty liver disease (NAFLD) may have more severe disease. We aim to study the epidemiology and severity of non-obese NAFLD. METHODS: A total of 911 community subjects were randomly recruited from the census database of the Hong Kong Government. Intrahepatic triglycerides (IHTG) and liver fibrosis were assessed by proton-magnetic resonance spectroscopy and transient elastography, respectively. The Asian body mass index cutoff of 25 kg/m(2) was used to define non-obese NAFLD. RESULTS: The prevalence of NAFLD was 19.3% in non-obese subjects and 60.5% in obese subjects (P<0.001). Compared with obese NAFLD patients, non-obese NAFLD patients had similar IHTG content (median 9.8% vs. 9.9%; P=0.100) but lower cytokeratin-18 fragments (149 vs. 182 IU/l; P=0.019) and liver stiffness (4.6 vs. 5.6 kPa; P<0.001). The G allele at the patatin-like phospholipase domain-containing protein 3 gene (PNPLA3 rs738409) was more common in non-obese than obese NAFLD patients (78.4% vs. 59.8%; P=0.001). Obesity, high hemoglobin A1c, insulin resistance, hyperferritinemia, and the PNPLA3 G allele were independent factors associated with NAFLD in non-obese subjects. Even among non-obese subjects with normoglycemia, those with NAFLD were more insulin resistant (mean homeostasis model assessment of insulin resistance: 2.0±1.0 vs. 1.1±1.1; P<0.001). CONCLUSIONS: One-fifth of the general non-obese Chinese population has NAFLD. Non-obese patients with NAFLD do not have a higher risk of steatohepatitis or advanced fibrosis. Patients with risk factors of advanced fibrosis such as metabolic syndrome and PNPLA3 G allele carriage should be assessed for severe NAFLD.

Transaxillary thyroidectomies: a comparative learning experience of robotic vs endoscopic thyroidectomies.

OBJECTIVE: Robotic and endoscopic approaches have become more accepted in thyroid surgery, with current literature documenting the experience of high-volume centers. We adopted both approaches concurrently, and this series presents our initial experience to assess the more practical option for low- to moderate-volume centers starting out with transaxillary thyroidectomies. STUDY DESIGN: Case series with chart review. SETTING: Tertiary academic center. SUBJECTS AND METHODS: Over a period of 4 years, 101 patients underwent transaxillary thyroidectomies, of whom 48 underwent robotic thyroidectomy and 53 underwent endoscopic thyroidectomy. Data analysis includes patient characteristics, procedure time, thyroid pathology, and postoperative complications. A survey was conducted among surgeons to assess the subjective experience. RESULTS: Endoscopic hemithyroidectomies had a significantly shorter duration of operation (145.8 minutes) vs that of robotic hemithyroidectomies (193.6 minutes), P < .001. The mean time taken for the first 5 hemithyroidectomies vs the last 5 hemithyroidectomies showed a greater drop in the endoscopic group (49.1%) vs the robotic group (18.6%). There were 2 cases of transient recurrent laryngeal nerve injury. In the surgeon survey, the endoscopic technique was perceived to have less need for peripheral support, while the robotic technique was preferred for its shorter learning curve. CONCLUSION: In terms of outcome, both techniques are comparable at least in the initial phase. Based on our early experience, the endoscopic technique may be less intuitive with a longer learning curve, although at steady state, it may be the quicker procedure. This is relevant for low- to moderate-volume centers starting their transaxillary thyroidectomy program.