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Sleeve Gastrectomy in Non-alcoholic Steatohepatitis …
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Sleeve Gastrectomy in Immunocompromised Patients

Amin Andalib

1 Introduction

Over the course of the past decade and a half, sleeve gastrectomy (SG) has become the most frequently performed primary bariatric surgery worldwide [1, 2]. During this time period, the popularity of SG has mainly been driven by the infe­rior results after adjustable gastric banding coupled with SG procedure being tech­nically easier to perform compared to bypass-type procedures [3, 4] as well as its safety profile and the satisfactory long-term outcomes [57]. Consequently, SG has turned into the procedure of choice in patients with complex medical histories including those suffering from advanced chronic kidney disease [8], renal trans­plant candidates [9] or patients suffering from inflammatory bowel disease (IBD) [10] and other conditions requiring chronic immunosuppressant therapy [11].

2 Safety and Postoperative Morbidity

In the general population and irrespective of comorbid conditions, laparoscopic SG is considered to be very safe with a thirty-day mortality and composite mor­bidity of 0.05% and 2.4%, respectively [12]. Two of the most troubling postop­erative complications are postoperative staple-line leaks (0.6–1%) and hemorrhage (0.7–1.4%) [1214].
In the current era of bariatric surgery, with the improved operative safety pro­files and the established role for minimally invasive techniques, patients who
A. Andalib (*) Center for Bariatric Surgery, Department of Surgery, McGill University, Montreal, QC, Canada e-mail: amin.andalib@mcgill.ca
© The Editor(s) (if applicable) and The Author(s), under exclusive license to Springer Nature Switzerland AG 2021 S. Al-Sabah et al. (eds.), Laparoscopic Sleeve Gastrectomy,
https://doi.org/10.1007/978-3-030-57373-7_16
139
A. Andalib140
undergo bariatric/metabolic procedures more frequently suffer from severe base­line chronic conditions including IBD, rheumatoid/autoimmune disorders, and solid organ transplantation. These conditions are routinely treated with immu­nosuppressive agents and other novel disease-modifying anti-rheumatic drugs (DMARDs). Consequently, the immunocompromised patients are considered a high-risk population for perioperative adverse events by the nature of their chronic use of immunosuppressants and other DMARDs that impact their wound healing and prone them to infectious postoperative complications [15, 16].
2.1 Postoperative Morbidity After SG
in Immunocompromised Patients
For the immunocompromised patient population, SG is widely accepted as the bariatric/metabolic procedure of choice [17] and this is primarily due to its accept­able safety profile and low incidence of major postoperative complications.
In a large multicenter study using 2005–2013 data from the American College of Surgeons National Surgical Quality Improvement Program (ACS NSQIP), Andalib et al. evaluated the 30-day postoperative outcomes of primary SG and roux-en y gastric bypass (RYGB) in patients on chronic immunosuppressant medications within at least 30 days prior to surgery [11]. While 30-day postop­erative mortality and major morbidity were significantly higher among the patients dependent of chronic immunosuppression compared to those who were not (0.5% vs. 0.1% and 5.0% vs. 2.5%, respectively), the prevalence of such major complica­tions were acceptable. Furthermore, both SG and RYGB procedures were found to be equally safe in this patient population [11]. In another large study by Mazzei et al. using 2015–2016 Metabolic and Bariatric Surgery Accreditation and Quality Improvement Program (MBSAQIP) data, after a propensity-matched analysis, chronic preoperative use of corticosteroids was not found to be an independent predictor for worse outcomes except for a two-fold higher risk for leak (0.6% vs.
0.3%) along with slightly higher risk of readmission and reintervention after both SG and RYGB compared to patients who did not take steroids [18]. Despite the ele­vated risk, the overall incidence of such postoperative adverse events remains low. In addition, there is also data demonstrating the safety of continuing certain immu­nomodulators and biologic agents in the immediate perioperative period leading up to surgery such as cardiac, orthopedic and colorectal procedures [1820].

2.2 Perioperative Timing of Immunosuppressive Therapy

Given that the use of immunosuppressant/modulators is often critical for mainte­nance and management of patients’ chronic rheumatoid and autoimmune disor­ders, the consequences of withholding perioperative dosing should be carefully considered by bariatric surgeons and in consultation with the respective treating specialists. Moreover, due to the lack of high-quality studies on the perioperative
Sleeve Gastrectomy in Immunocompromised Patients
141
use and management of these agents in patients undergoing bariatric surgery, there is great variability in clinical practice regarding holding or timing of perioperative dosing of immunosuppressive agents [21].
In a recent systematic review, Kassel et al. attempted to evaluate the impact and management of perioperative use of immunosuppressive agents in patients undergoing bariatric surgery [21]. However, given the limited literature available on the use of immunosuppressive therapies in patients undergoing bariatric sur­gery, data from non-bariatric procedures, specifically abdominal or other gastro­intestinal operations were used to examine the risks associated with perioperative use of immunosuppressive agents and DMARDs. Also due to the small and het­erogeneous nature of the available studies, the data could not be pooled to pro­vide a meta-analysis [21]. Although immunosuppressants discussed in this review article were associated with an increased risk for infections, the limited data available suggest corticosteroids, methotrexate, and tumor necrosis factor-alpha (TNF-α) inhibitors may be safe to restart postoperatively provided there are no signs of infections [21]. Furthermore, if medically possible prior to elective bari­atric surgery, one should aim to hold immunosuppressants 2–12 weeks preopera­tively and until 2–4 weeks after surgery [22, 23]. For biologic immunomodulators and other DMARDs like TNF-α inhibitors, the timing of the surgery should ide­ally be planned according to the last dose since most agents are administered every 2–8 weeks (Table 1) and if needed only one dose may be skipped after surgery [24].
Therefore, management of each immunosuppressant agent must be han­dled individually and based on their respective routine interval dosing due to the
Table 1 Summary of preoperative dosing recommendations for selected TNF-α inhibitors. (Adapted from Ref. [21])
Generic name (Brand)
Adalimumab (Humira)
Certolizumab (Cimzia)
Etanercept (Enbrel) SC 1–2 weeks 3 days 2–3 weeks Golimumab
(Simponi)
Infliximab (Remicade)
TNF-α = Tumor necrosis factor-alpha; SC = Subcutaneous; IV = Intravenous
a
Dosing interval may vary based on the indication for the medication and the severity of the
disease
b
Administration of the last dose may vary depending on the dosing interval
Route of administration
SC 1–2 weeks 14 days 2–3 weeks
SC 2–4 weeks 14 days 3–5 weeks
SC 4 weeks 14 days 5 weeks IV 8 weeks 9 weeks SC 4–8 weeks 9 days 5–9 weeks
Dosing intervalaHalf-life
Recommended administration of last dose (before surgery date)
b
A. Andalib142
varying disease-specific desired effects and the potential for undesired periopera­tive adverse events. Ideally, the decision and the timing to withhold the immuno­suppressant medications should be weighed against the benefits of their use for each case individually and in a multi-disciplinary fashion. Additional research is needed to determine, with more granularity, the timing recommendations to hold and restart these medications with respect to bariatric surgery.

3 Outcomes of SG in Immunocomromised Patients

3.1 Weight Loss and Improvements in Obesity-Related
Conditions
As previously mentioned, the literature on the use of bariatric surgery especially SG in immunocompromised patients is scant. Therefore, the data on the beneficial outcomes of SG in this patient population is also mainly driven from case series [10, 2527]. Furthermore, given the small sample size in reported studies, and an even smaller sample size for those who underwent SG, reported weight loss and comorbidity outcomes are pooled together and reported for all types of bariatric surgery included [10, 2527].
In a systematic review, Shoar et al. discuss 7 studies that have reported out­comes of bariatric surgery in a total of 43 IBD patients of whom 58% suffered from Crohn’s disease [27]. Crohn’s patients more often underwent SG (72%), while those with ulcerative colitis underwent SG or RYGB in similar frequency (44%). Overall between 8 and 77 months after bariatric surgery, IBD patients had an average 71% excess weight loss (EWL) and a 14.3 kg/m2 drop in body mass index (BMI) [27].
In a recent prospective cohort study, Xu et al. report on the 1-year outcomes of obese patients suffering from rheumatoid arthritis who underwent bariatric surgery (n = 32) and compared them to an obese non-surgical group (n = 33) [28]. In the surgical arm, 41% of patients underwent SG procedure and the rest had RYGB. At one-year, bariatric surgery yielded an average 33 kg weight loss equivalent to 11.3
2
drop in BMI [28].
kg/m
In terms of long-term weight loss after SG procedure in the general population, a 40–60% EWL or a mean BMI reduction of 8–10 kg/m2 are realistic estimates to consider [2931]. Moreover, long-term improvements in obesity-related condi­tions especially metabolic syndrome including type 2 diabetes mellitus after SG are impressive and occur in >60% of patient population [6, 30, 31]. When compar­ing long-term outcomes of SG to RYGB, a recent meta-analysis of 4 randomized control trials with reported 5-year outcomes of SG and RYGB procedures revealed that weight loss up to 5 years after surgery has been either comparable or favoring RYGB with only a modest difference in BMI (1–2 kg/m2) and weight loss up to 5 kg [7]. Moreover, five years after surgery, the remission rate of type 2 diabetes mellitus was similar between SG and RYGB (55% vs. 60%, respectively; p = 0.42) [7]. Hence, SG procedure is highly effective for weight loss and improving
Sleeve Gastrectomy in Immunocompromised Patients
143
obesity-related conditions. Finally, as demonstrated above the weight loss and related comorbidity outcomes after SG procedure appear to be similar among the immunocompromised patients and the general population.

3.2 Changes to Rheumatoid and Autoimmune Conditions

Obesity is common among patients with rheumatoid and autoimmune disorders such as rheumatoid arthritis and IBD [32, 33]. Moreover, obese patients with these conditions often have worse response to therapy after all types of DMARDs [3436]. This association is not very surprising as obesity is linked to an increase in a pro-inflammatory state mediated by known cytokines such as interleukin-6, TNF-α, as well as adipokines such as leptin, adiponectin, and resistin, or neuro­peptides such as substance P, which are all molecules either produced within adipocytes or within macrophages and lymphocytes that infiltrate the mesenteric fat [37, 38]. Consequently, since both obesity and autoimmune disorders share a chronic inflammatory state, the advantage of bariatric/metabolic surgery in allevi­ating severity of such conditions is not surprising.
Various studies have demonstrated the improvement in many autoimmune dis­orders after bariatric surgery. In a study using 2004–2014 United States National Inpatient Sample database, Sharma et al. identified 15,319 morbidly obese patients who had a combined discharge diagnosis of IBD, of whom 3.2% (n = 493) had prior bariatric surgeries (47% underwent SG; n = 233) [39]. They found that a prior bariatric surgery was associated with lower incidence rate ratios for renal failure, malnutrition, and fistulae formation compared to obese non-surgical group [39]. The systematic review by Shoar et al. mentioned earlier evaluating out­comes of bariatric surgery in 43 IBD patients, of whom 58% had Crohn’s disease mainly involving the small bowel, reported disease remission in 20 patients (48%), improvement in another two individuals (5%), but disease exacerbation was noted in 17% [27]. Interestingly, intestinal bacterial overgrowth that can develop due to bypass-type bariatric procedures like RYGB, may be associated with acute flare-ups of Crohn’s disease [40, 41]. Also, there is a potential risk of flare-up cri­ses in patients with small bowel Crohn’s disease, involving the operated segments of the small bowel after RYGB. Thus, one might argue that for obese patients with Crohn’s disease especially those with small bowel involvement and previous bowel resections, SG should be the bariatric procedure of choice.
Similar association and improvements were shown after bariatric surgery for patients with other rheumatoid disorders including gout, psoriasis, systemic lupus erythematosus, multiple sclerosis, and rheumatoid arthritis [4246]. As mentioned above, in a prospective cohort study, Xu et al. reported on 1-year outcomes of obese patients suffering from rheumatoid arthritis who underwent bariatric surgery (41% had SG surgery) compared to an obese non-surgical group [28]. At 1-year follow-up and compared to obese controls, patients who underwent bariatric sur­gery, showed significantly better American College of Rheumatology 20/50/70
A. Andalib144
(ACR 20/50/70) criteria and the weight loss after surgery was associated with lower disease activity [28].
Finally, although bariatric procedures are shown to improve outcomes of obese patients with rheumatoid disorders, bariatric surgery could also lead to some del­eterious effects especially with respect to bone metabolism and is associated with an elevated risk of fractures [46]. SG is shown to have a less negative impact on bone metabolism compared to bypass-type procedures like RYGB or duodenal switch [4749]. Thus, in the absence of any contraindication like severe gastroe­sophageal reflux disease, SG may once again be a better procedure choice in the immunocompromised patients due to rheumatoid disorders.

4 Summary

In summary, while studies on the perioperative use of immunosuppressive agents in patients undergoing bariatric surgery are lacking, the use of these medications in this population are not. The timing and the risk of withholding immunosuppres­sant medications should be weighed against the benefits of their use in each case and in a multi-disciplinary fashion. If medically possible prior to elective bariat­ric surgery, one should aim to hold immunosuppressants 2–12 weeks preopera­tively and until 2–4 weeks after surgery. When applicable, for some DMARDs like TNF-α inhibitors, the timing of the surgery should be planned according to the last dose since most agents are administered every 2–8 weeks and if needed only one dose can be skipped after surgery. The beneficial outcomes of SG including weight loss and improvements in obesity-related conditions in the immunocompromised patients are comparable to those in immunocompetent individuals. Furthermore, given that both obesity and rheumatoid/autoimmune disorders share a chronic inflammatory state, it is not surprising that a reduction in obesity-induced inflam­mation after SG can lead to improvements in these conditions requiring immuno­suppressive therapy.

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