Autogenous hepatic tissue transplantation into the omentum in a novel ectopic liver regeneration murine model.

BACKGROUND: Liver regeneration involves hyperplasia and hypertrophy of hepatic cells. The capacity of macroscopic liver tissue to regenerate in ectopic sites is unknown. We aim to develop a novel in vivo model of ectopic liver survivability and regeneration and assess its functionality. METHODS: Adult male Sprague-Dawley rats (n = 23) were divided into four groups: (1) single-stage (SS) group, wedge liver resection was performed, and the parenchyma was directly implanted into the omentum; (2) double-stage (DS) group, omentum pedicle was transposed over the left hepatic lobe followed by wedge liver resection along with omental flap; (3) Biogel + DS group, rats received intraperitoneal injection of inert polymer particles prior to DS; (4) Biogel + DS + portal vein ligation (PVL) group, Biogel + DS rats underwent subsequent PVL. Hepatobiliary iminodiacetic acid scintigraphy assessed bile excretion from ectopic hepatic implants. RESULTS: Histologically, the scores of necrosis (P < 0.001) and fibrosis (P = 0.004) were significantly improved in rats undergoing DS procedure (groups 2, 3, and 4) compared with the SS group. Biogel rats (Biogel + DS and Biogel + DS + PVL) demonstrated statistically increased scores of bile duct neoformation (P = 0.002) compared to those without the particles (SS and DS). Scintigraphy demonstrated similar uptake of radiotracer by ectopic hepatic implants in groups 2, 3, and 4. CONCLUSIONS: Omental transposition provided adequate microcirculation for proliferation of ectopic hepatic cells after liver resection. Inert polymers enhanced the regeneration by promoting differentiation of new bile ducts. The ectopic hepatic implants showed preserved function on scintigraphy. This model provides insights into the capacity of liver parenchyma to regenerate in ectopic sites and the potential as therapeutic target for cell therapy in end-stage liver disease.

Utilisation of radiology rotations in ACGME-accredited general surgery programmes.

BACKGROUND: General surgery (GS) residents are often required to provide immediate preliminary interpretations of radiological images, especially in critical situations. It is unclear whether residents in Accreditation Council for Graduate Medical Education-accredited GS programmes receive sufficient radiological training to deliver adequate patient care. OBJECTIVES: Determine the utilisation of radiology rotations (RR) during GS residency. METHODS: Between February and March 2015, a pilot voluntary 19-item survey was electronically distributed to GS programme directors (PDs) regarding the availability and value of a RR during GS training. RESULTS: A total of 234 PDs received the questionnaire and the response rate was 36.8% (n=86). Sixty-five (77.4%) PDs expected their trainees to interpret imaging studies in the acute setting; however, only 8.3% of programmes had a dedicated RR. RRs are more prevalent among community-based than university-based programmes (71.4% vs 27.9% p=0.003). The implementation of a RR may be limited due to insufficient number of GS residents in the department (p=0.002). 75.4% of PDs expect GS residents to confirm their findings with a radiologist. In those programmes with RR, most PDs (85.7%) believed that a dedicated rotation improved GS residents' understanding of radiological imaging. CONCLUSION: The majority of PDs are currently not confident that GS residents are capable of interpreting radiological imaging independently; however, the implementation of a mandatory RR in GS residency curriculum yet seems to be controversial. Given the expectation of PDs and the continued need to improve patient care, the integration of a dedicated RR in GS training should be encouraged.

Impact of medical or surgical admission on outcomes of patients with acute cholecystitis.

BACKGROUND: Although acute cholecystitis (AC) is a surgical disease, patients with the condition may be admitted to medical-related services (MS). This may lead to delayed cholecystectomy thereby affecting outcomes and quality of care. METHODS: Between July 2010 and March 2013, 329 patients under 70 years old presented to a community-based tertiary care hospital with AC and underwent same admission cholecystectomy. Outcomes were compared between patients admitted to MS and surgical services (SS). RESULTS: Two hundred fifteen patients (65.3%) were admitted to a MS. Patients under the MS had longer LOS (3.0 days vs. 2.0 days, p < 0.001), waiting time to surgical consultation (7.3 h vs. 5.0 h, p < 0.001) and to cholecystectomy (1.0, 0-2 days vs. 1.0, 0-1 day, p < 0.001), and increased hospital costs ($3685 vs. $4,688, p < 0.001) compared to the SS. Readmission and mortality rates were not significantly different between groups. CONCLUSION: Patients under 70 years old with AC undergoing cholecystectomy admitted to MS had increased LOS, delay to the operation, and hospital costs compared to those admitted to a SS. Admission of patients with AC to a SS needs to be emphasized to reduce costs and improve quality of care.

Optimal Surgical Management for Occult Breast Carcinoma: A Meta-analysis.

BACKGROUND: Occult breast cancer (OBC) represents a rare clinical entity and poses a therapeutic dilemma. Due to limited experience, no optimal treatment approaches have yet been established. METHODS: A meta-analysis was performed using MEDLINE and EMBASE databases to identify all studies investigating the surgical options for OBC: (1) axillary lymph node dissection (ALND) with radiotherapy (XRT); (2) ALND with mastectomy; and (3) ALND alone. Comparative studies including nonoperative management (observation or XRT alone) were excluded. The primary endpoints were locoregional recurrence, distant metastasis, and mortality rates. RESULTS: The literature search yielded 42 publications. Seven studies met the inclusion criteria comprising 241 patients. Among these patients, 94 (39 %) underwent ALND with XRT, 112 (46.5 %) underwent mastectomy, and 35 (14.5 %) underwent ALND alone. Mean follow-up was 61.8 ± 16.2 months (range 5-396 months). Locoregional recurrence (12.7 vs. 9.8 %), distant metastasis (7.2 vs. 12.7 %), and mortality rates (9.5 vs. 17.9 %) were similar between ALND with XRT and mastectomy. ALND with XRT was superior to ALND alone regarding locoregional recurrence (12.7 vs. 34.3 %, p < 0.01) and there was a trend toward improved mortality rates (9.5 vs. 31.4 %, p = 0.09). CONCLUSIONS: There was no difference in survival outcomes between mastectomy and ALND with XRT of patients with OBC. Radiotherapy improves locoregional recurrence and, possibly mortality rates of patients undergoing ALND. Based on this meta-analysis, combined ALND and radiation therapy may appear as the optimal surgical approach in these patients.

Chest wall lump: lipoma or intramuscular myxoma?

Intramuscular myxomas (IM) of the chest wall are extremely rare. We present the case of a 58-year-old African-American female who was initially diagnosed with having a chest wall lipoma. After re-evaluation, the lesion was consistent with an intercostal myxoma versus myxoid sarcoma. Preoperative imaging could not exclude malignancy. Given the diagnostic uncertainty, she underwent primary wide local resection and placement of polypropylene mesh for chest wall reconstruction. Histopathological examination revealed an intramuscular myxoma without sarcomatous changes arising from the 8th intercostal muscle bundle.

Robotic Cholecystectomy Is a Safe Educational Alternative to Laparoscopic Cholecystectomy During General Surgical Training: A Pilot Study.

OBJECTIVE: The role of robotic surgery in general surgery (GS) continues to expand. Several programs have integrated robotic-based simulators and models into surgical education; however, residents' robotic experience in the operating room is currently limited. We sought to assess the safety and feasibility of robotic cholecystectomy (RC) when independently performed by GS chief residents. METHODS: From June 2016 to October 2018, RC and laparoscopic cholecystectomies (LC) performed independently by chief residents on a resident staff surgical service were prospectively included. Patient demographics, intraoperative variables, and postoperative complications were analyzed and compared between both cohorts. RESULTS: A total of 20 RC and 70 LC were included. Patient characteristics, indications for surgery, and comorbidities were similar in both groups. RC was more likely to be performed electively (95% vs. 17.1%, p < 0.001). No difference in operative time, estimated blood loss, intraoperative bile duct injury, or conversion to open was observed. Patients undergoing LC had an overall longer mean length of hospital stay (2.7 days ± 2.1 vs. 0.8 days ± 0.4, p < 0.001); however, length of hospital stay was similar between RC and LC performed electively (p = 0.946). No difference in postoperative complications and 30-day readmission was observed. CONCLUSIONS: RC can be safely and independently performed by GS residents with similar outcomes as LC. Efforts should be directed toward creating a platform to bridge competent simulator skills into safe performance in the operating suite. The integration of robotic training into the core GS curriculum should be encouraged.

Interpretation of Basic Clinical Images: How Are Surgical Residents Performing Compared to Other Trainees?

BACKGROUND: During medical training students, residents, and fellows learn how to accurately interpret basic radiographic images. This skill is mostly utilized by physicians in the acute and critical care settings. It is unclear whether surgical residents' interpretation skills differ from that of other trainees. METHODS: A 30-question online quiz was developed to evaluate trainees' skills in interpreting images using various radiologic modalities. The participating cohort included (1) medical students (MS), (2) general surgery residents (GST), internal medicine residents and fellows (IMT), and radiology trainees (RT). The impact of residency specialty and level of training on performance was evaluated. RESULTS: A total of 69 postgraduate trainees and 19 MS enrolled in the online quiz. The average score was 67.6% (±16.6). GST scored higher than IMT (74.2% ± 10.7% vs. 67.9% ± 11.3%, p = 0.038); however, they were equally proficient to RT. MS had the lowest interpretation accuracy rates compared to postgraduate trainees (57.4% ± 16.8%, p < 0.001). On different radiographic modalities, junior GST performance was comparable to MS, JR-IMT, and Junior Radiology Trainees (JR-RT). On computed tomography (CT) body, GST (83.1% ± 15.7%) scored higher than IMT (70.3% ± 17.7%, p = 0.026) and MS (61.7% ± 23.4%, p < 0.001). Similar findings were demonstrated on ultrasound modality. A difference in performance was not evident for X-rays, CT head, and tubes/lines localization images. CONCLUSIONS: GST were able to correctly interpret 74.2% of basic clinical images. Although superior in the evaluation of pathologies seen on CT body and ultrasound, GST have comparable performance to other trainees in X-rays, tube/line localization images, and CT head. Integration of radiology education in surgical training may enhance performance and potentially improve patient care.

An Unforeseeable Complication; Posterior Ischemic Optic Neuropathy after Penetrating Injury to the Heart.

Trauma surgeons are currently encountering unusual adverse events after traumatic injuries. Ischemic optic neuropathy is a rare complication that may occur in trauma and burn patients that present in extremis and require massive resuscitation. A 29-year-old male patient sustains a penetrating injury to the heart that required primary repair. He remained hemodynamically stable and required a limited amount of resuscitative fluids and products. Postoperatively, the patient develops acute painless bilateral loss of vision. These findings were consistent with posterior ischemic optic neuropathy. Ischemic optic neuropathy are uncommon entities that arise in trauma patients who require massive resuscitation. Given the limited treatment options, early diagnosis is key in limiting the hemodynamic insult to the optic nerve.

Assessing surgical residents' imaging interpretation skills.

PURPOSE: During general surgery (GS) training, residents are expected to accurately interpret radiologic images. Objective evidence evaluating residents' ability to provide accurate interpretation of imaging studies is currently lacking. METHODS: A 30-item web-based test was developed using images from different radiologic modalities. Residents from 6 ACGME accredited GS programs participated. Residents from 1 radiology program served as a control group. RESULTS: 74 GS residents (GSR) enrolled in the online test. The mean score for GSR was 75% (±9) and 83% (±6) for RR (p = 0.006). Residents correctly answered 63% x-rays, 74%, CT(head), 84% CT(body), 69% ultrasound, and 88% tube/line localization questions. Senior residents were more proficient than junior residents at interpreting CT (body) and ultrasound images. CONCLUSION: GS residents were able to accurately interpret 75% of basic radiology images. In an effort to improve patient care, programs should consider integrating radiological education during surgical training.

Differences in duty hours and their relationship with academic parameters between preliminary and categorical general surgery residents.

BACKGROUND: There is the perceived notion that nondesignated preliminary general surgery (P-GS) interns are treated differently (i.e., overworked) than their categorical GS (C-GS) counterparts are treated, or in an effort to prove themselves worthy of a categorical position, nondesignated preliminary residents may self-choose to work more. Empirical evidence examining duty-hour differences between P-GS and C-GS residents is lacking. METHODS: We retrospectively reviewed 4 academic years (July 2009 to June 2013) of our self-entered duty-hour database. Duty hours were averaged over 4-week periods and then averaged annually for each intern. Duty-hour averages and the percentage of conference attendance between P-GS and C-GS interns were compared. Sensitivity analyses were conducted to evaluate the effect of the 2011 duty-hour regulations, attendance to educational activities, seasonal variations in workload, and the Match Day effect. RESULTS: A total of 70 P-GS and 43 C-GS interns were compared. Duty-hour averages (±standard deviation, range) were 64.4h/wk (±4.6; 45-70) for the P-GS interns and 64.1h/wk (±3.9; 57-72) for the C-GS interns, p = 0.8. Mean (±standard deviation, range) conference attendance was 61% (±17; 33-89) for the P-GS interns and 66% (±18; 44-85) for the C-GS interns (p = 0.13). Duty-hour averages for both the groups positively correlated with conference attendance (r = 0.27, p = <0.001). The P-GS and the C-GS interns worked on average 4.8 hours more a week after the implementation of the 2011 Accreditation Council of Graduate Medical Education duty-hour regulations when compared with before implementation (66.7 ± 4.1 vs 62 ± 3.1, p < 0.0001), with no difference between both the groups. No seasonal variation in duty hours was encountered for either group. For the P-GS interns, no difference in duty hours was observed before or after the Match Day. CONCLUSIONS: At our institution, the P-GS and the C-GS interns have equivalent duty-hour periods and similar conference attendance. An expected, a positive correlation was observed between duty hours and conference attendance. Average weekly duty hours increased by almost 5 hours after the implementation of the 2011 duty-hour regulations.

An unusual cecal mass on routine colonoscopy.

Cecal masses secondary to extra-luminal compression are rare. We report a case of a 72-year-old man with a cecal mass found during routine colonoscopy with multiple biopsies showing normal colonic mucosa. The patient had a relevant past surgical history of a bilateral open inguinal hernia repair using the 'Plug-and-Patch' mesh system. A computed tomography scan of the abdomen and pelvis showed a 4 × 3.3 cm mass that compressed the wall of the cecum. A neoplastic process could not be ruled out. Diagnostic laparoscopy with intraoperative colonoscopy showed that the right hernia plug was not deployed and was causing extrinsic compression of the anterior cecal wall and an intraluminal impression upon insufflation of the colon. This case report reiterates the importance of combining intraoperative colonoscopy with laparoscopy for diagnosis of undetermined colonic masses.