Publications by authors named "Nicholas McKenna"

Background: The incidence of rectal cancer has decreased overall, but the incidence of early-onset rectal cancer (eoRC) has increased. Early-onset rectal cancer and late-onset rectal cancer (loRC) differ due to phenotypical, genetic characteristics, and higher stage presentations in eoRC. Thus, eoRC patients undergo more aggressive neoadjuvant treatments.

View Article and Find Full Text PDF

Anal Melanoma (AM) is a rare and aggressive disease lacking standardized treatment protocols. Despite advancements in medical oncology, the 5-year overall survival (OS) remains at 20%. Local surgery (LS) has gained popularity over radical surgery (RS) due to its comparable OS when negative margins are achieved.

View Article and Find Full Text PDF

Introduction: Ileocolonic anastomoses have a low anastomotic leak (AL) risk, resulting in infrequent diverting loop ileostomy use. Identifying patients who warrant diverting loop ileostomy with right-sided resection is challenging due to this low incidence of AL. Therefore, a multicenter database was used to develop an AL risk score to help inform when diversion should be strongly considered after right-sided resections.

View Article and Find Full Text PDF

Introduction: The purpose of this study was to evaluate the association of MIS approaches for rectal cancer with long-term postoperative bowel dysfunction.

Materials And Methods: This was an Institutional Review Board-approved observational cohort study including consecutive patients with rectal or rectosigmoid cancer who underwent surgical resection between 2007 and 2017. The primary exposure was surgical approach, defined as open surgery or MIS (laparoscopy or robotic surgery).

View Article and Find Full Text PDF

Background: There has been concern among colon and rectal surgery residency programs in the United States that IPAA procedures have been decreasing, but evidence is limited.

Objective: The study aimed to evaluate the number of IPAAs performed by colon and rectal surgery residents in the United States and analyze the distribution of these cases on a national level.

Design: Retrospective.

View Article and Find Full Text PDF

Postoperative bowel dysfunction following restorative proctectomy, commonly referred to as Low Anterior Resection Syndrome (LARS), is a common long term sequela of rectal cancer treatment. While many of the established risk factors for LARS are non-modifiable, others may be well within the surgeon's control. Several pre-, intra-, and postoperative decisions may have a significant impact on postoperative bowel function.

View Article and Find Full Text PDF

The aim was to determine whether on-call case volumes differ amongst colorectal surgeons, and what cases are performed on-call in an academic colorectal surgery practice. The on-call schedule for the year 2021 of a colorectal surgery practice was analyzed. Details of the case origin and operative details were collected.

View Article and Find Full Text PDF

Background: Operative options for duodenal Crohn's disease include bypass, stricturoplasty, or resection. What factors are associated with operation selection and whether differences exist in outcomes is unknown.

Methods: Patients with duodenal Crohn's disease requiring operative intervention across a multi-state health system were identified.

View Article and Find Full Text PDF

Background: The COVID-19 pandemic has severely affected healthcare systems globally, resulting in significant delays and challenges in various medical treatments, particularly in cancer care. This study aims to investigate the repercussions of the pandemic on surgical interventions for colorectal cancer (CRC) in the US, using data from the National Cancer Database.

Study Design: We conducted a retrospective analysis of the National Cancer Database, encompassing adult patients who underwent surgical procedures for colon and rectal cancer in 2019 (pre-COVID) and 2020 (COVID).

View Article and Find Full Text PDF
Article Synopsis
  • - Patients with inflammatory bowel disease (IBD) have a higher risk of developing postoperative venous thromboembolism (VTE), with the majority of these events occurring within the first 30 days after surgery.
  • - In a study of 2716 ulcerative colitis (UC) surgeries and 2921 Crohn's disease (CD) surgeries, researchers found that patients experienced VTE rates of 1.95% and 1.43%, respectively, within the first 30 days post-operation.
  • - The most common location for VTE was found to be in the portomesenteric system, and specific surgical procedures like proctectomies (for UC) and total abdominal colectomies (
View Article and Find Full Text PDF

Background: Patients with inflammatory bowel disease (IBD) and primary sclerosing cholangitis (PSC) frequently undergo restorative proctocolectomy with ileal pouch-anal anastomosis (IPAA) for medically refractory disease or colonic dysplasia/neoplasia. Subtotal colectomy with ileosigmoid or ileorectal anastomosis may have improved outcomes but is not well studied. Due to increased risk for colorectal cancer in PSC-IBD, there is hesitancy to perform subtotal colectomy.

View Article and Find Full Text PDF

Background: Brome grass (Bromus diandrus Roth) is prevalent in the southern and western cropping regions of Australia, where it causes significant economic damage. A targeted herbicide resistance survey was conducted in 2020 by collecting brome grass populations from 40 farms in Western Australia and subjecting these samples to comprehensive herbicide screening. One sample (population 172-20), from a field that had received 12 applications of clethodim over 20 years of continuous cropping, was found to be highly resistant to the acetyl-CoA carboxylase (ACCase)-inhibiting herbicides clethodim and quizalofop, and so the molecular basis of resistance was investigated.

View Article and Find Full Text PDF

Background: Surgical site infections (SSIs) are one of the most common complications following diverting loop ileostomy (DLI) closures. This study assesses SSIs after DLI closure and the temporal trends in skin closure technique.

Methods: A retrospective review was conducted using the American College of Surgeons National Surgical Quality Improvement Program database for adult patients who underwent a DLI closure between 2012 and 2021 across a multistate health system.

View Article and Find Full Text PDF

Background: Existing venous thromboembolism (VTE) risk scores help identify patients at increased risk of postoperative VTE who warrant extended prophylaxis in the first 30 days. However, these methods do not address factors unique to colorectal surgery, wherein the tumor location and operation performed vary widely. VTE risk may extend past 30 days.

View Article and Find Full Text PDF

Background: Postoperative day (POD) 1 laboratory tests are routinely ordered after bariatric operations.

Objectives: Determine how often these laboratory tests are abnormal and whether they represent value-added care.

Setting: Academic medical center, United States.

View Article and Find Full Text PDF

Background: A left-sided anastomotic leak risk score was previously developed and internally but not externally validated.

Methods: Left-sided colectomy anastomotic leak risk scores were calculated for patients within the ACS NSQIP Colectomy Targeted PUF from 2017 to 2018 and institutional NSQIP databases at three hospitals from 2011 to 2019. The calibration and discrimination of the risk score was assessed.

View Article and Find Full Text PDF

Background: The development of major low anterior resection syndrome (LARS) after low anterior resection is severely detrimental to quality of life, yet awareness of it by clinicians and patients and the frequency of treatment of LARS is unclear.

Study Design: Patients who underwent low anterior resection for sigmoid or rectal cancer at a tertiary center between 2007 and 2017 (n = 798) were surveyed in 2019 to assess LARS symptoms and report medications or treatment received for LARS. LARS scores were calculated (score range 0-42) and normalized to published data on LARS prevalence in the general population in Europe, stratified by age (<50 or ≥50) and sex.

View Article and Find Full Text PDF

This study aimed to compare the survival of patients with isolated inguinal lymph node metastases from rectal cancer to patients with inguinal and additional synchronous distant metastases from rectal cancer who treated with curative intent. A retrospective review of all consecutive adult patients with rectal adenocarcinoma and inguinal lymph node involvement who underwent curative therapy at our institution from 2002 to 2020 was conducted. Patients were classified as having synchronous inguinal lymph node metastasis (SILNM), or synchronous inguinal lymph node and distant organ metastasis (SILNDOM).

View Article and Find Full Text PDF

Here, we offer a step-by-step description of the technique for an Altemeier perineal rectosigmoidectomy, which is our institution's preferred perineal approach for patients with full-thickness rectal prolapse. This article is supplemented by a series of high-quality clinical images that are available in Figs S1-S11. The principles of this technique are to excise the rectal prolapse and improve structural support of the pelvic floor.

View Article and Find Full Text PDF

Background: Patients with IBD are at increased risk for developing colorectal cancer. However, overall survival and disease-free survival for rectal cancer alone in patients with IBD has not been reported.

Objective: This study aimed to determine overall survival and disease-free survival for patients with rectal cancer in IBD versus non-IBD cohorts.

View Article and Find Full Text PDF