Basic Physics Revisited for a Surgeon

3dct Conduit and Oesophageal Metrics, a Valuable Method to Diagnose Post Sleeve Gastrectomy Abnormalities

PURPOSE

Reflux after laparoscopic sleeve gastrectomy (LSG) may result from anatomical and functional anomalies in the gastric conduit. Three-dimensional CT scans (3DCT) offer a comprehensive view of gastric anatomy. This study aims to establish specific measurements associated with sleeve abnormalities to standardise the reporting of 3DCT which may help in management of LSG complications.

MATERIALS AND METHODS

This retrospective study analysed 64 post-LSG patients who underwent gastric 3DCT. Data included clinical demographics, pre-LSG BMI, BMI at 3DCT, and the duration between surgery and examination. Symptomatology prompts the scan and other concurrent investigations. Various 3DCT measurements were taken, including angularis angle (AA), surface area (ASA), conduit length (CL), proximal maximal surface area (PMSA), and distal maximal surface area (DMSA) of the gastric conduit. Patients were categorised based on endoscopy findings and symptomatology. Outcomes post-revisional surgery were assessed and analysed.

RESULTS

20.3% were male. Pre-LSG BMI and BMI at 3DCT were 45.57 (± 8.3) and 36.3 (± 8.7), respectively. Mean surgery-to-scan period was 6.2 years. 71.8% of patients presented with reflux, regurgitation, or dysphagia, whilst the remainder primarily exhibited weight regain. Patients with endoscopic evidence of stenosis/reflux demonstrated significantly lower gastric volume, ASA, and DMSA (p = 0.002 and p = 0.007, respectively). Oesophageal diameter above the conduit and an ASA to DMSA ratio ≤ 0.5 were negatively associated with AA (p = 0.008 and p = 0.08, respectively). Patients with improved outcomes after revisional bypass and gastrogastrostomy displayed a negative correlation with ASA and positive correlation with the ASA to PMSA ratio (≤ 0.5).

CONCLUSION

3DCT measurements have a potential role in defining post-LSG stenosis and predicting outcomes of revisional surgery. Patients with anatomic abnormalities that are shown on CT appear to improve with anatomic correction.

The Straw Pressure Gradient and Gravity (SPGG) Technique: A Safe and Cost-Effective Technique for Laparoscopic Suction

Suction devices are frequently used during laparoscopic surgery. However, their cost and limitations can be significant, depending on the clinical case, theatre setting and national health system. Furthermore, the continuous need to reduce the costs of the consumables in minimally invasive surgical procedures and their environmental burden creates extra pressure on the healthcare systems globally. Therefore, we present a new technique for laparoscopic suctioning, the Straw Pressure Gradient and Gravity (SPGG) technique. It is a safe, cost-effective and environmentally friendly technique compared to traditional suction devices. The technique involves using a sterile, single-use Suction Catheter 12-16 French after positioning the patient according to the targeted collection. The catheter is inserted via the laparoscopic port nearest the collection and directed using laparoscopic graspers. The outer end needs to be clamped to avoid fluid spillage, and the catheter tip is placed in the collection. Then after the clamp is released, the fluid will be successfully drained due to the pressure gradient into a pot placed at a lower level than the intra-abdominal collection. Minimal wash can be performed via the gas vent by using a syringe. SPGG is a safe and easy-to-learn technique that requires similar skills as placing an intra-abdominal drain during laparoscopy. It is softer than rigid, traditional suction devices and atraumatic. It can be used for suction, irrigation, collection of fluid for sampling and as a drain in case of an intraoperative indication. SPGG is a cost-effective device as it is cheaper than the average disposable suction device system and has multiple uses, which can significantly decrease the annual cost of laparoscopies. It can also reduce the number of consumables and lighten the environmental burden of laparoscopic procedures.

Impact of Treatment for Nasal Cavity Disorders on Sleep Quality: Systematic Review and Meta-analysis

OBJECTIVE

To determine the impact of treatment for patients with nasal obstruction secondary to allergic rhinitis (AR) and nasal septal deviation (NSD) on sleep quality.

DATA SOURCES

Primary studies were identified though PubMed, Scopus, Cochrane Library, and Web of Science.

REVIEW METHODS

A systematic review was performed by querying databases for articles published through August 2020. Studies were included that reported on objective sleep parameters (apnea-hypopnea index) and sinonasal and sleep-specific patient-reported outcome measures: Rhinoconjunctivitis Quality of Life Questionnaire, Nasal Obstruction Symptom Evaluation, Epworth Sleepiness Scale (EpSS), and Pittsburgh Sleep Quality Index (PSQI).

RESULTS

The database search yielded 1414 unique articles, of which 28 AR and 7 NSD studies were utilized for meta-analysis. A total of 9037 patients (8515 with AR, 522 with NSD) were identified with a mean age of 35.0 years (35.3 for AR, 34.0 for NSD). Treatment for AR and NSD significantly improved subjective sleep quality. For AR, the EpSS mean difference was -1.5 (95% CI, -2.4 to -0.5; P = .002) and for the PSQI, -1.7 (95% CI, -2.1 to -1.2; P < .00001). For NSD, the EpSS mean difference was -3.2 (95% CI, -4.2 to -2.2; P < .00001) and for the PSQI, -3.4 (95% CI, -6.1 to -0.6; P = .02).

CONCLUSION

Subjective sleep quality significantly improved following treatment for AR and NSD. There were insufficient data to demonstrate that objective metrics of sleep quality similarly improved.

Muscle elasticity is different in individuals with diastasis recti abdominis than healthy volunteers

Objective

To determine the value of shear wave elastography (SWE) in assessing abdominal wall muscles, including rectus abdominis (RA), external oblique muscle (EO), internal oblique muscle, and transversus abdominis (TrA) in patients with diastasis recti abdominis (DRA) and healthy controls.

Methods

From October 2018 to December 2019, 36 postpartum DRA patients and 24 nulliparous healthy women were identified. Inter-rectus distance (IRD) measurements were taken by B-mode ultrasound. Shear wave speed (SWS) values were acquired by one operator at ten specific locations. Clinical and ultrasound variables, including demographics, IRD, muscle thickness, and muscle SWS, were compared between the two groups using Student’s t test or Fisher's exact test. Pearson correlation analyses were conducted for the variables of IRD, muscle thickness, and SWS in the 36 DRA patients.

Results

The maximum diameter of recti abdominus separation was located at the umbilicus in DRA patients (4.59 ± 1.14 cm). The SWS value was significantly lower in the RA (p = 0.003) and higher in the TrA muscle (p < 0.001) in DRA patients compared with the age-matched controls. However, SWS in both muscles (RA and TrA) showed a statistically positive correlation with IRD (p < 0.05). In addition, the SWS value in EO statistically decreased in DRA patients compared with the healthy controls (1.65 ± 0.15 vs. 1.79 ± 0.14, p = 0.001).

Conclusions

The application of SWE to abdominal wall muscles in DRA patients is feasible. The correlation between SWS value and IRD in RA should be interpreted with caution.

Hybrid approach to ventral wall hernia repair: a single-institution cohort study

Background

Ventral hernias pose a substantial challenge for surgeons. Even though minimally invasive surgery and hernia repair have evolved rapidly, there is no standardised method that has been widely accepted as standard of practice. Hybrid ventral hernia repair (HVR) is an alternative surgical approach, which has not been adopted widely to date. It combines laparoscopic mesh insertion with closure of the hernia defect. The aim of this retrospective cohort study is to evaluate short- and long-term outcomes in patients undergoing HVR.

Methods

Between October 2012 and June 2016, 56 HVRs were performed at St Mary’s Hospital, Imperial College London. The medical records of these patients were reviewed retrospectively for demographics, comorbidities, previous surgeries, operative technique, complications and recurrences over a 3-year follow-up.

Results

HVRs were performed by four surgeons. Mean age was 48 years with a mean body mass index (BMI) of 32.8 kg/m2. 71.4% had incisional hernias and 28.6% had primary hernias. The number of hernia defects ranged from 1 to 4, with average defect size 42.9 cm2 (range 8–200 cm2). Adhesiolysis was performed in 66.1% of patients. Recurrence occurred in 2 patients (3.6%), 16.1% of patients developed postoperative seroma, 0.3% had respiratory complications, 0.3% had paralytic ileus and 0.2% had urinary retention. Only 2 patients required epidural postoperatively, both had a defect size of 150.0 cm2. There were no reoperations within 90 days. Mean length of hospital stay was 2 days (1–10 days). Over the follow-up period, 2 patients (3.6%) developed chronic pain.

Conclusion

The hybrid technique is safe and feasible, and has important benefits including low rates of seroma formation, chronic pain and hernia recurrence. Future investigations may include randomised controlled trials to evaluate the benefits of VHR, with careful assessment of patient-reported outcome measures including quality of life and postoperative pain.

Primary non-complicated midline ventral hernia: is laparoscopic IPOM still a reasonable approach?

PURPOSE

Ventral hernia repair has become a common procedure, but the way in which it is performed still depends on surgeon's skill, experience, and habit. The initial open approach is faced with extensive dissection and a high risk of infection and prolonged hospital stay. To tackle these problems, minimally invasive procedures are gaining interest. Several new techniques are emerging, but laparoscopic intra-peritoneal onlay mesh (IPOM) is still the mainstay for many surgeons. We will discuss why laparoscopic IPOM is still a valuable approach in the treatment of primary non-complicated midline hernias and review the current literature.

METHODS

We performed a literature search across PubMed and MEDLINE using the following search terms: "Laparoscopic hernia repair", "Ventral hernia repair" and "Primary ventral hernia". Articles corresponding to these search terms were individually reviewed by the primary author and selected on relevance.

CONCLUSION

Laparoscopic IPOM still is a good approach for the efficient treatment of primary non-complicated midline hernias. Several techniques are emerging, but are faced with increased costs, technical difficulties, and low study patient volume. Further research is warranted to show superiority and applicability of these new techniques over laparoscopic IPOM, but until then laparoscopic IPOM should remain the go-to technique.

Management of colon stents based on Bernoulli's principle

BACKGROUND AND AIMS

The colonic self-expanding metal stent (SEMS) has been widely used for "bridge to surgery" and palliative therapy. However, if the spread of SEMS is insufficient, not only can a decompression effect not be obtained but also perforation and obstructive colitis can occur. The mechanism of occurrence of obstructive colitis and perforation was investigated by flow dynamics.

METHODS

Bernoulli's principle was applied, assuming that the cause of inflammation and perforation represented the pressure difference in the proximal lumen and stent. The variables considered were proximal lumen diameter, stent lumen diameter, flow rate into the proximal lumen, and fluid density. To model the right colon, the proximal lumen diameter was set at 50 mm. To model the left-side colon, the proximal lumen diameter was set at 30 mm.

RESULTS

For both the right colon model and the left-side colon model, the difference in pressure between the proximal lumen and the stent was less than 20 mmHg, when the diameter of the stent lumen was 14 mm or more. Both the right colon model and the left-side colon model were 30 mmHg or more at 200 mL s^-1 when the stent lumen was 10 mm or less. Even with an inflow rate of 90-110 mL s^-1, the pressure was 140 mmHg when the stent lumen diameter was 5 mm.

CONCLUSION

In theory, in order to maintain the effectiveness of SEMS, it is necessary to keep the diameter of the stent lumen at 14 mm or more.