Abstract
Background
Symptomatic haemorrhoids affect a large number of patients throughout the world. The aim of this systematic review was to compare the surgical outcomes of stapled haemorrhoidopexy (SH) versus open haemorrhoidectomy (OH) over a 20-year period.
Methods
Randomized controlled trials published between January 1998 and January 2019 were extracted from Pubmed using defined search criteria. Study characteristics and outcomes in the form of short-term and long-term complications of the two techniques were analyzed. Any changes in trend of outcomes over time were assessed by comparing article groups 1998–2008 and 2009–2019.
Results
Twenty-nine and 9 relevant articles were extracted for the 1998–2008 (period 1) and 2009–2019 (period 2) cohorts, respectively. Over the two time periods, SH was found to be a safe procedure, associated with statistically reduced operative time (in 13/21 studies during period 1 and in 3/8 studies during period 2), statistically less intraoperative bleeding (3/7 studies in period 1 and 1/1 study in period 2) and consistently less early postoperative pain on the visual analogue scale (12/15 studies in period 1 and 4/5 studies in period 2) resulting in shorter hospital stay (12/20 studies in period 1 and 2/2 studies in period 2) at the expense of a higher cost. In the longer term, although chronic pain in SH and OH patents is comparable, patient satisfaction with SH may decline with time and at 2-year follow-up OH appeared to be associated with greater patient satisfaction.
Conclusions
SH appears to be safe with potential advantages, at least in the short term, but the evidence is lacking at the moment to suggest its routine use in clinical practice.
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Introduction
Symptomatic haemorrhoids account for approximately 3.3 million outpatient encounters annually in the United States [1], while up to 37% of the general population in the United Kingdom may be affected by the same disease process [2]. Grade III and IV haemorrhoidal disease (Goligher classification) responds more favourably to surgical treatment [3]. Traditional open haemorrhoidectomy (OH) is still the gold standard operation but it is associated with significant postoperative pain and a small risk of injury to the anal sphincter complex [4, 4]. Novel surgical procedures such as the haemorrhoidal artery ligation operation (HALO) and stapled haemorrhoidopexy (SH) have been increasingly used in recent years. However, robust evidence strongly supportive of a specific technique is lacking. The introduction of SH in 1998 promptly caught the interest of colorectal surgeons. The technique has been used mostly in North America and European countries. The United Kingdom has yet to adopt this procedure on a significant scale. The aim of this systematic review was to assess the surgical outcomes of this procedure in comparison to OH over a 20-year period (since the introduction of SH in 1998) and assess changes in its safety profile to the present day.
Materials and methods
Search strategy and study selection
The PubMed database was searched for relevant studies published between January 1998 and January 2019. The search criteria ‘staple* AND haemorrhoid* OR hemorrhoid’ were broadly used and a series of rigid inclusion criteria were subsequently applied. A study was deemed suitable for inclusion if the publication [1] was a randomized controlled trial (RCT) [2], compared at least two surgical methods of haemorrhoidal management with mandatory inclusion of OH [3], involved human subjects, and [4] was written in English. Two independent reviewers (QZR and AH) used the above-mentioned inclusion criteria for all research papers derived from the search. Studies were included after titles and abstracts were evaluated for suitability. Articles without abstracts were excluded. Full-text versions were then acquired. In the event of disagreement, a consensus method was used amongst the two reviewers The review was conducted in accordance with the guidelines set out in the “Preferred Reporting Items for Systematic Reviews and Meta-Analyses” (PRISMA) statement [6]. Collectively, selected articles were subcategorized into two classes by year (1998–2008; 2009–2019) for data interpretation and subsequent comparison.
Data extraction and outcome measures
Data extracted included study characteristics (study objective, type of study, methods of analysis) and outcomes (immediate complications, long-term complications, and overall qualitative conclusion). The derivative qualitative conclusions were defined by the positions represented by the most number of articles for that category (SH superior, SH similar to OH, SH inferior). If there were equal numbers of articles for opposing positions, the position with the most number of articles with supporting p values was taken as the overall qualitative conclusion. Only statistically significant p values were taken as the benchmark when assessing validity of study conclusions. Some studies did not calculate statistical significance when comparing the above parameters and chose to qualitatively summarize their data. We have made it a point to label their p values ‘undefined’, but their observations continued to be acknowledged during our analyses.
Statistical analysis
GraphPad Prism 7.0 (GraphPad Software, Inc. La Jolla, CA, USA) was used for all statistical calculations in this paper. Student’s t test and the Mann–Whitney test were employed to compare continuous trends in complications across the two chronological classes (1998–2008 and 2009–2019), while Fisher’s exact test was used to determine differences in categorical outcomes. A p value < 0.05 was considered statistically significant.
Results
In total, 1716 articles were initially identified by the search on 12th January 2019. After abstract screening and exclusion, a total of 38 articles met inclusion criteria for further analysis (Fig. 1).
Twenty-nine [7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35] and 9 articles [36,37,38,39,40,41,42,43,44] were selected for the chronological categories of 1998–2008 and 2009–2019, respectively. The mean number of patients per study was 197 ± 80 (range 22–3000 patients). Patients were followed-up for a mean of 76.5 ± 14.4 weeks (range 4.4–365.4) weeks. Randomisation was conducted prior to treatment for the majority of the studies (24 of 38). Twenty-three of the studies demonstrated that there was no statistically significant difference in demographics between the patient groups being compared. Basic study characteristics are demonstrated in Tables 1, 2.
Fourteen of the trials included procedures on grades III and IV haemorrhoids only. The remaining trials included interventions on grades II, III and IV haemorrhoids in various permutations. Ten articles did not ascertain the types of haemorrhoids treated. All patients had previously failed non-operative management. Specifically for SH, the majority of studies used the “Procedure for Prolapse and Haemorrhoids” (PPH) stapler (22 of 38). All studies assessed similar outcomes, classifying them largely into immediate complications, long-term complications, recurrences and patient satisfaction. Three of the trials performed cost analyses.
For comparisons against SH, alternative operative interventions considered OH Harmonic scalpel haemorrhoidectomy (HSH) and Ligasure haemorrhoidectomy (LH).
Studies performed from 2009 to 2019 incorporated larger study populations (561 ± 314 vs 84 ± 16, p = 0.009) and trended towards a longer follow-up period (103.4 ± 30.2 weeks vs 68.1 ± 16.4 weeks, p = 0.3) compared to the period of 1998–2008. The likelihood of the RCTs having formal descriptions of comparable patient demographics (p > 0.9) and study randomization (p = 0.44) were similar over the two time periods, as were studies to include a section on cost analyses comparing the methods of haemorrhoidectomy (p > 0.9).
Immediate complications
Multiple immediate complications and outcomes were assessed among various operative groups including prolonged operative time, intraoperative blood loss, postoperative burning, postoperative bleeding, urinary retention, length of hospital stay and wound infection.
From 1998 to 2008, a total of 13 out of 21 studies reported a significantly shorter operative duration for SH than for OH in comparison to just 2 which stated otherwise (Table 3). Similarly from 2009 to 2019 (Table 4), five of eight studies reported similar findings (3 to statistical significance) with just one arguing the reverse (that SH requires longer operative time). Immediate postoperative bleeding was similar between SH and OH in both decade-long categories but more studies revealed SH to be favourable in reducing urinary retention in the 1998–2008 group (10 of 17 vs 4 of 17), although this only reached significance in 1 study, as well as the 2009–2019 group (3 of 6 vs 0 of 6) 2 studies reaching significance. Total length of hospital stay of SH patients was shorter in both groups, with 14 of 20 (10 reaching significance) (1998–2008) and 3 of 6 (2 reaching significance) (2009–2019) articles demonstrating shorter hospital stay over the last 20 years. The above data are summarized in Tables 3, 4.
A total of 20 studies used a visual analogue scale (VAS) to assess postoperative pain. Earlier studies (1998–2008) tended to measure postoperative pain over the short term (hours to days), with only one study exploring pain at the 4-week mark [34]. These studies were consistent in demonstrating significantly lower VAS scores in the SH group, especially in the hours to days following surgery. More recent studies performed after 2008 explored pain control up to a year post procedure [47]. The advantages of SH in limiting short-term postoperative pain in this group largely corroborate with findings in the 1998–2008 group, while long-term benefits were more difficult to discern (Table 5).
Long-term complications
The long-term complications evaluated included fistulae, incontinence, anal stenosis, tenesmus, chronic pain and recurrence (Tables 6, 7). There was limited evidence of any single complication being significantly more closely associated with SH compared to the other surgical approaches. Risks of incontinence and recurrence were the two complications most frequently measured by studies throughout the last 2 decades.
From 1998 to 2008, SH was associated with less chronic pain postoperatively, with two studies reaching significance. This was mirrored by Ripetti et al. [41] who were able to demonstrate a lower risk of anal stenosis (p = 0.004) and chronic rectal pain (p < 0.01) with SH in the 2009–2019 group. There was a study that suggested SH had a higher risk of causing postoperative tenesmus (p = 0.0012) [43]. As far as other complications were concerned, there were no differences between SH and OH. For recurrence, from 1998 to 2008, close to half of the articles (5 of 14) raised concerns of higher recurrence in SH but only 2 studies reached significance, while from 2009 to 2019, the number was reduced to 2 out of 7 with both studies reaching significance.
Patient satisfaction
From 1998 to 2008, 22 articles assessed postoperative patient satisfaction. Fourteen of the 22 articles failed to demonstrate a difference in satisfaction scores between SH and OH groups but 6 studies reported statistically significant satisfaction post SH (Table 8).
Regarding articles published from 2009 to 2019, Wang et al. compared overall satisfaction scores of SH and OH, and reported a 97% satisfaction rate in SH vs 78% in OH [40]. An analysis of patient quality of life calculated via the EQ 5D 3L score was performed in the eTHOs trial by Watson et al. [43]. They demonstrated that scores were higher in the SH group up to 6 weeks postoperatively (p = 0.0235). At 12 months, there was no statistically significant difference in satisfaction between SH and OH or closed haemorrhoidectomy (CH) patient groups, but at 24 months, satisfaction became highest in the OH/CH group (p = 0.0342).
Cost
The cost of treatments was mentioned in three of the studies. In 2002, Wilson et al. calculated that open haemorrhoidectomy cost $1798 per procedure, higher than that of Autosuture stapled anopexy ($1156) and Ethicon stapled anopexy ($1312). In 2016, the eTHOs trial showed that SH cost £941 per patient and OH or CH cost £602 per patient, concluding that SH costs more and provides a lower number of quality-adjusted life years (QALYs) per patient than OH or CH [43]. Bilgin et al. [42] did not perform a formal cost analysis but pointed out that the equipment costs for the harmonic scalpel were double that for SH.
Discussion
SH was introduced in 1998 as a conceptually attractive surgical technique as it mobilizes the prolapsed rectal mucosa above the dentate line, back to its original anatomical position [48]. Since stapling is meant to be performed above the dentate line on insensate rectal mucosa, postoperative pain and discomfort ought to be minimized, thereby positively influencing length of stay [42]. Resection of a circumferential ring of rectal mucosa eliminates all distal feeding vessels from the superior rectal artery, theoretically attaining a higher degree of surgical completeness and an expected lower risk of recurrence.
This systematic review appears to show that SH is a safe procedure potentially associated with decreased intraoperative blood loss and operative times. It is interesting to note that the shorter SH operative time was already well demonstrated early on (1998–2008) but did not improve further during the latter time period (2009–2019), as shown in Tables 3, 4. In fact, the operative time did not change across the two decades, perhaps indicating that a plateau is reached early beyond which further improvement is not possible [20].
SH seems to be less painful in the immediate postoperative period leading to less urinary retention. In the longer term, although pain was less frequent post SH, overall patient satisfaction appears to decline with time with OH/CH associated with greater quality of life scores after 2 years [43]. Despite the lack of formal statistical analysis when it came to cost-evaluation, mainly due to the fact that cost was not consistently reported in all studies, SH is probably less cost efficient compared to OH or CH, although the supporters of the procedure state that it is not the most resource-demanding procedure on the market and savings are accrued through reduced operative time and shorter length of hospital stay. However, the eTHos trial reported a lower number of QALYs casting further doubts on its potential advantages [43].
Recurrence is an important measure of technical efficacy and SH appears to be just as effective as other surgical interventions. Reports in the past had shown concerns about using SH on grade IV haemorrhoids due to the risk of higher recurrence but this has not been convincingly demonstrated. In our review, the risk of recurrence was deemed similar in SH and OH through both decades, with a smaller fraction of published articles demonstrating higher recurrence risks in SH from 2009 to 2019 compared to 1998–2008, possibly due to increased experience and improved stapling devices. Doppler-guided transanal haemorrhoidal dearterialization (THD) did, however, seem to consistently be associated with higher recurrence rates than SH [45]. Furthermore, despite the inability of SH to excise external haemorrhoidal components, it was often observed that the external lesions shrink due to disruption of their blood supply [34]. It has also been suggested that as the stapling preserves the haemorrhoid tissues and seeks only to disrupt its blood supply, its elimination is more physiological than outright excision, therefore reducing the risk of anal stenosis [12], which supports the findings in Table 7.
Severe complications such as deep pelvic sepsis and peritonitis are recognised but rare complications of haemorrhoidal surgery. It was thought that SH, due to the extent of its tissue manipulation and circumferential involvement of the rectal mucosa, would dispose patients to a higher risk of deep infections. Furthermore, rectal perforation was considered to be an almost exclusive complication of SH from inappropriate deployment of the stapling mechanism [52]. Our review did not identify a single case of these complications although anecdotally they have occurred. Furthermore, it is worthy of note that several other high-volume techniques used in haemorrhoid surgery such as Doppler-guided THD [53] as well as haemorrhoid laser procedure (HeLP) [54] have been associated with postoperative complications necessitating faecal diversion. These occurrences show that the potential for postoperative morbidity is not exclusive to SH. Nonetheless, one must be vigilant in recognizing rare complications such as rectal pocket syndrome [55], rectocoele and rectal intussusception [56] so as to prevent severe pelvic or intra-abdominal sepsis.
Studies were keen to include patients’ self-rated satisfaction levels following surgery in an attempt to quantify the more subjective components of a successful procedure. The most comprehensive of them used the EQ 5D 3L, which captures personal dimensions of mobility, self-care, activity, pain, anxiety as well as an overall self-rated well-being score [57]. SH was good in measurements of patient satisfaction in most selected RCTs we evaluated [40, 47] even when placed under the scrutiny of EQ 5DL 3L, although satisfaction appeared to decline with time [43].
Current evidence suggests that SH is a safe surgical option in the management of haemorrhoid disease. It continues to be embraced by many in the field as a robust and reliable technique with potential, but not fully proven, advantages, at least in the short term. Nevertheless, it has not been found to be inferior to other techniques in this review. The concerns regarding the use of staples remain, which explains why the technique has not been widely adopted in the UK and many other countries. Perhaps the use of biodegradable staples may alleviate some of these concerns and further improve its safety profile.
Conclusions
The evidence is lacking at the moment to suggest routine use of SH but it can be safely considered in selected patients. It is still not known what group of patients is most likely to benefit from the procedure.
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Ruan, Q.Z., English, W., Hotouras, A. et al. A systematic review of the literature assessing the outcomes of stapled haemorrhoidopexy versus open haemorrhoidectomy. Tech Coloproctol 25, 19–33 (2021). https://doi.org/10.1007/s10151-020-02314-6
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DOI: https://doi.org/10.1007/s10151-020-02314-6