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Original Research

Chronic postsurgical pain: still a neglected topic?

Igor KissinDepartment of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USACorrespondence[email protected]
&
Simon GelmanDepartment of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA
Pages 473-489 | Published online: 05 Nov 2012

Abstract

Background

Surgical injury can frequently lead to chronic pain. Despite the obvious importance of this problem, the first publications on chronic pain after surgery as a general topic appeared only a decade ago. This study tests the hypothesis that chronic postsurgical pain was, and still is, represented insufficiently.

Methods

We analyzed the presentation of this topic in journal articles covered by PubMed and in surgical textbooks. The following signs of insufficient representation in journal articles were used: (1) the lack of journal editorials on chronic pain after surgery, (2) the lack of journal articles with titles clearly indicating that they are devoted to chronic postsurgical pain, and (3) the insufficient representation of chronic postsurgical pain in the top surgical journals.

Results

It was demonstrated that insufficient representation of this topic existed in 1981–2000, especially in surgical journals and textbooks. Interest in this topic began to increase, however, mostly regarding one specific surgery: herniorrhaphy. It is important that the change in the attitude toward chronic postsurgical pain spreads to other groups of surgeries.

Conclusion

Chronic postsurgical pain is still a neglected topic, except for pain after herniorrhaphy. The change in the attitude toward chronic postsurgical pain is the important first step in the approach to this problem.

Introduction

The recent report of the Institute of Medicine’s committee on pain relief in the US indicated that “more than 116 million Americans have pain that persists for weeks to years.”Citation1 The important part of this problem is chronic postsurgical pain. Aasvang and KehletCitation2 estimated the incidence of chronic pain after some surgical procedures: thoracotomy (approximately 50%), breast surgery (30%), cholecystectomy (10%–20%), and inguinal herniorrhaphy (10%). When the total number of patients who undergo these surgeries each year is taken into account, those figures are stunning. MacraeCitation3 tried to present some figures that reflect the magnitude of the chronic postsurgical pain problem. His calculations yielded at least 400,000 new cases of chronic pain each year (in the US). He also indicatedCitation4 that about 20% of patients attending chronic pain clinics name surgery as one of the causes of their chronic pain, and for about half of these patients it was the sole cause.

Despite the obvious importance of this problem, publications on chronic pain after surgery as a general topic began to appear only a decade ago.Citation4–Citation6 These authors analyzed more than 100 references related to chronic postsurgical pain, noting that several features were common to all publications: (1) they were strictly limited to specific operations, (2) they failed to give a detailed description of the operative approaches, and (3) they usually provided only superficial assessments of chronic pain.Citation4,Citation6 Their conclusion was that “chronic pain after surgery has been a neglected topic.”Citation4

The word “postsurgical” in the term “chronic postsurgical pain” already indicates the role of surgery in its genesis. The combination of two factors related to coping with this problem gives surgery an additional importance: (1) ineffective existing treatments of neuropathic pain and (2) the importance of surgical techniques avoiding nerve injuries in the prevention of this type of chronic pain. Unfortunately, treatments for neuropathic pain, including the majority of chronic postsurgical pain cases, are not very effective. No more than 40%–60% of patients obtain pain relief; in addition, the relief is only partial.Citation7 Existing evidence indicates that intraoperative nerve injury is the most important contributor to the development of chronic postsurgical pain.Citation8,Citation9 The analysis of all possible approaches for the prevention of postsurgical pain points to one reliable solution: surgical techniques that avoid nerve damage should be used wherever possible.Citation8 As a result, although chronic postsurgical pain is a topic relevant to many specialties (surgery, anesthesiology, neurology, pain medicine, rehabilitation medicine, and psychology), currently, the most promising approach to reducing the incidence and intensity of chronic postsurgical pain is almost completely in the hands of surgeons, who can select techniques that minimize the risk of nerve damage. Therefore, the adequate presentation of chronic postoperative pain in surgical journals and textbooks is especially important.

Our study tested the hypothesis that chronic pain after surgery was, and still is, represented insufficiently. We analyzed the presentation of this topic in journal articles covered by PubMed, especially in surgical journals, and also in surgery textbooks.

Methods

To test the study hypothesis with journal articles, we used the following three signs of insufficient representation: (1) the lack of journal editorials on chronic pain after surgery, (2) the lack of journal articles with titles clearly indicating that they are devoted to chronic postsurgical pain, and (3) the insufficient representation of chronic postsurgical pain in the top surgical journals. Concerning the analysis of textbooks, we followed the general approach used by Rabow et al.Citation10 The representation of chronic postsurgical pain in textbooks was assessed on the basis of the presence of this topic in general chapters and in the chapters on specific surgeries, as well as on the total content volume related to chronic pain after surgery. Journal articles were collected using the National Library of Medicine’s PubMed website (http://www.ncbi.nlm.nih.gov/PubMed). All types of articles published in English during 30 years (1981–2010) were included. Keywords related to the names of surgical interventions were added to the terms related to the chronic pain (“chronic pain” OR “neuropathy” OR “neuralgia”). Boolean operations were used in which the following variables were selected: keywords, years of publications, and type of publications. In addition to the electronic search of articles, related publications were also collected manually from the literature on chronic postsurgical pain ().

Figure 1 Flow chart of screened, excluded, and included articles on chronic postsurgical pain (1981–2010).

Figure 1 Flow chart of screened, excluded, and included articles on chronic postsurgical pain (1981–2010).

Editorials

The editorials (articles solicited by an editorial board to provide an editorial perspective on the article published in a journal) on chronic postsurgical pain were grouped into 5-year periods, starting with 1981–1985, separately for (1) all journals covered by PubMed and (2) only surgical journals.

Topic-in-title articles

To select journal articles with titles clearly indicating that they are devoted to chronic postsurgical pain (topic-in-title articles), the indication “[Title]” was added to all terms placed into PubMed search boxes. The topic-in-title type of articles were searched as representing chronic pain after surgery in general (when terms “surgery” [Title] OR “postoperative” [Title] were added to pain terms “chronic pain” [Title] OR “neuropathy” [Title]) or as representing chronic pain after specific surgeries (see ). The specific surgeries were selected on the basis of preliminary PubMed searches conducted with inclusion of various specific terms of surgical interventions and specific pain-related terms (indicated in ). In the preliminary searches, the indication “[Title]” in the PubMed search box was not used. The preliminary searches resulted in a total of 1043 references. The topic-in-title articles for a specific group of surgeries were counted only when a preliminary search for this group gave ten or more general (non-topic-in-title) references. Eight groups of surgeries were selected: herniorrhaphy, limb amputation, thoracic surgery, arthroplasty, breast surgery, cardiac surgery, gallbladder surgery, and prostatectomy. For inclusion as the topic-in-title publication, articles found in various searches were reviewed to make sure that they fit the definition of chronic pain after surgery. Articles with titles without certain indication of pain duration, such as “persistent,” “persisting,” “long-term,” “residual pain,” or “pain syndrome” were checked and included only if the duration of pain was 6 months or longer. If the duration of pain was indicated in the title of an article as 6 months or longer, it was also included in the database.

Table 1 Numerical representation of topic-in-title articles on chronic pain after specific surgeries, 1981–2010Table Footnotea

To quantitatively evaluate the response of surgical journals to the problem of chronic postsurgical pain, we analyzed the publications of topic-in-title articles in the top 20 surgical journals. It has been observed that the number of journal articles on a new and important topic rises much faster in the top specialty journals than it does in all other journals covered by PubMed.Citation11 We also calculated the Top Journal Selectivity Index (TJSI). This index represents the ratio of the number of articles in the top 20 surgical journals to the number of articles in all journals covered by PubMedCitation11,Citation12 (see Discussion). We counted only articles with titles clearly announcing that they are devoted to chronic pain after surgery (topic-in-title articles). The selection of the top 20 surgical journals was based on the rank of a journal sorted by the impact factor, as indicated by Journal Citation Reports for year 2010 (http://science.thomsonreuters.com). The following surgical journals were included: the American Journal of Surgery, American Journal of Surgical Pathology, American Journal of Transplantation, Annals of Surgery, Annals of Surgical Oncology, Archives of Surgery, British Journal of Surgery, Dermatologic Surgery, Endoscopy, Journal of the American Academy of Orthopaedic Surgeons, American Journal of Bone and Joint Surgery, Journal of Gastrointestinal Surgery, Journal of Shoulder and Elbow Surgery, Journal of Surgical Oncology, Journal of Vascular Surgery, Journal of Thoracic and Cardiovascular Surgery, Surgical Endoscopy, Surgery, Transplantation, and World Journal of Surgery.

Textbooks

The assessment of representation of chronic postsurgical pain in the surgical textbooks was based on the analysis of three texts selected on the basis of two factors: the text should be eponymously titled (named texts) and also should be sorted as one of the top three surgical texts held in libraries as listed in the meta-catalog WorldCat (worldcat.org). The following textbooks were selected: Sabiston Textbook of Surgery, 18th ed, 2008;Citation13 Schwartz’s Principles of Surgery, 9th ed, 2009;Citation14 and Greenfield’s Surgery, 5th ed, 2010.Citation15 For comparison, an anesthesiology textbook was also analyzed: Miller’s Anesthesia, 7th ed, 2010.Citation16 All textbooks were inspected on the presence of materials related to chronic postsurgical pain (number of lines of text, tables, figures, references). The data were collected in three steps: (1) review of chapters on basic principles (examination of the table of contents, identification of chapters devoted to general topics, inspection of all pages of identified chapters), (2) review of specific surgeries (examination of text index for keywords concerning specific surgeries: limb amputation, thoracotomy, coronary artery bypass grafting, mastectomy, cholecystectomy, herniorrhaphy, and arthroplasty; inspection of all pages of identified chapters), and (3) examination of the text index (keywords concerning specific chronic pain syndromes: causalgia, complex regional pain syndrome, neuralgia, neuropathy, pain chronic, pain neuropathic, phantom pain; inspection of all pages indicated for these terms.) Each textbook was assessed by two reviewers (SG and IK). Discrepancies in the count were resolved by consensus.

Results

Editorials

The results on the representation of chronic postsurgical pain in journal editorials are presented in . Since 1981 only nine editorials were published (two in 2001–2005 and seven in 2006–2010). Seven of them appeared in anesthesiological journals (four in Anesthesiology) and none in surgical journals.

Table 2 Editorials on chronic postsurgical pain

Topic-in-title articles

Topic-in-title articles (clearly announcing the problem of chronic postsurgical pain) are presented in . This table reflects only the number of articles that represent chronic pain after surgery in general. It indicates that the topic-in-title articles began to appear in significant numbers only relatively late, especially in surgical journals (2001–2010). compares the numbers of topic-in-title articles on chronic and acute postsurgical pain represented as a percentage of all articles on chronic or acute pain (without the indication “surgery” and “postoperative”). The percentage of the topic-in-title type of articles on chronic postsurgical pain was 0% in 1981–1990 and rose to 0.8% in 2001–2010. Nevertheless, even in 2001–2010 it was one-seventh the number on acute postsurgical pain.

Table 3 Topic-in-title articles on chronic postsurgical pain, 1981–2010

Table 4 Comparisons of topic-in-title articles on chronic and acute postsurgical pain

The summary of the results with the topic-in-title articles for eight specific groups of surgeries is presented in . The most publications were on herniorrhaphy (54 articles), then, in decreasing order, amputation (47), thoracic surgery (28), arthroplasty (21), breast surgery (15), and cardiac surgery (13). There were only five topic-in-title articles on gallbladder surgery and three on prostatectomy. The distribution of articles among journals of different specialties depended on the type of specific surgeries. With herniorrhaphy it was mostly surgical journals, with limb amputation mostly pain journals and disability/rehabilitation journals, and with all other surgeries mostly anesthesiology and pain journals. presents the time-related progress in numerical representation of topic-in-title articles on chronic pain after specific surgeries in all journals and separately in all surgical journals. In surgical journals the only impressive rise was for herniorrhaphy, from five articles in 1991–2000 to 41 in 2001–2010.

Table 5 Time-related progress in numerical representation of topic-in-title articles on chronic pain after specific surgeries

The publication of topic-in-title articles on chronic pain after surgery in the top 20 surgical journals is represented in . In 1991–2000 only two articles were published in the top surgical journals, but that dramatically increased (to 18) in 2001–2010. The TJSI calculated for herniorrhaphy (only for topic-in-title articles) was 36.7% in 2001–2010. That means that these articles published in the top 20 surgical journals constitute almost one-third of all articles published in journals covered by PubMed (>5000). However, the same index for the other seven surgeries was only 2.9%.

Table 6 Top Journal Selectivity Index (TJSI) for representation of chronic pain as an adverse effect of surgery

Textbooks

The textbook analysis is presented in . Only chronic pain after inguinal herniorrhaphy was present in all three surgical texts (but not in Miller’s Anesthesia). Greenfield’s Surgery mentioned chronic pain after three specific surgeries (more than the other texts in this regard); however, it did not include anything on chronic postsurgical pain in the chapters on basic principles. Orthopedic surgeries in general were included only in one of the three surgical texts; therefore, chronic pain after arthroplasty is not in the table. The number of chronic pain-related references varied from two to five in the surgical texts, and there were 12 references in Miller’s Anesthesia. The chronic pain-related figures or tables were absent in Sabiston Textbook of Surgery and Greenfield’s Surgery. There were two chronic pain-related tables in Schwartz’s Principles of Surgery. Miller’s Anesthesia included two figures and two tables related to chronic postsurgical pain. The total number of lines on chronic postsurgical pain was more or less similar: from 85 to 64 lines in the surgical texts and 100 lines in Miller’s Anesthesia. Taking into account that one page of the texts has approximately 120 lines and the total volume of the texts varies from 2000 to 3000 pages, the presentation of chronic pain after surgeries is almost negligible.

Table 7 Presentation of chronic postsurgical pain in surgical textbooks

Discussion

The indices that were used in this study indicated that the topic of chronic postsurgical pain is represented insufficiently, especially in surgical journals. Only nine editorials on chronic postsurgical pain were published in 1981–2010, all in nonsurgical journals. The articles clearly announcing the problem of chronic postsurgical pain (topic-in-title articles) began to appear in significant numbers only relatively late, in 2001–2010; however, even during the last decade they were sevenfold fewer than articles on acute postsurgical pain. In 1991–2000 only two topic-in-title articles on chronic pain after surgery were published in the top 20 surgical journals. There was a clear sign that the interest in chronic postsurgical pain began to increase in 2001–2010, but only in one group of surgeries: herniorrhaphy. The topic-in-title articles in all journals with this type of surgery increased from five (1991–2000) to 49 (2001–2010). The increase in postherniorrhaphy pain reporting is in stark contrast to publications regarding other types of postsurgical pain, especially in surgical journals ().

Figure 2 Number of topic-in-title articles published in 1991–2000 and 2001–2010 periods on chronic pain after the four types of specific surgeries.a Notes: aAlong the vertical axis, the number (#) of articles published in all journals (including surgical journals), the number of articles published in surgical journals (including top 20 surgical journals), and the number of articles published in top 20 surgical journals (listed in the method section). Along the horizontal axis, the four types of specific surgeries with the highest number of published articles.

Figure 2 Number of topic-in-title articles published in 1991–2000 and 2001–2010 periods on chronic pain after the four types of specific surgeries.a Notes: aAlong the vertical axis, the number (#) of articles published in all journals (including surgical journals), the number of articles published in surgical journals (including top 20 surgical journals), and the number of articles published in top 20 surgical journals (listed in the method section). Along the horizontal axis, the four types of specific surgeries with the highest number of published articles.

The most significant sign of insufficient representation of chronic postsurgical pain is found in the presentation of this topic in surgical textbooks (2008–2010 editions). The presentation of chronic postsurgical pain in less than a page for various groups of surgeries per 2000–3000 pages of a textbook is clearly inadequate. However, chronic pain after herniorrhaphy is reflected in all three surgical texts analyzed (mostly very briefly).

Over the 10 years since the publication of seminal papers presenting postsurgical chronic pain,Citation4–Citation6 an important change has occurred but only in one area: chronic pain after herniorrhaphy. TJSI for herniorrhaphy has reached 36.7% (). It means that approximately one-third of all articles on herniorrhaphy in all journals covered by PubMed were published in the top 20 surgical journals. TJSI represents the ratio of the number of articles in the top 20 journals of the specialty to the number of articles in all journals covered by PubMed (>5000). A surge of this index is the sign of rising interest in a publication topic. For some reason, the top journals respond more rapidly to new and important developments in a specialty.Citation11,Citation12,Citation17 At a time when TJSI for chronic pain after herniorrhaphy was so high, it was ten times lower for seven other surgeries (2.9%), reflecting insignificant attention to chronic pain after these types of surgeries. Hopefully, the increased TJSI for herniorrhaphy indicates the initial change in the attitude toward chronic postsurgical pain in general and that it will soon spread to other groups of surgeries.

Such a change in attitude is necessary because of the vast number of patients with chronic postsurgical pain. MacraeCitation3 gave some insight into the magnitude of the problem by taking the number of operations performed in the US in 1994 (only for seven groups of surgeries) and multiplying it by the lowest figures for the incidence of chronic pain for these surgeries. His calculations yielded a possible 394,000 cases of chronic postsurgical pain each year. The complete absence of editorials related to this problem in the 1990–2000 period clearly indicates that the attention of the medical community was not focused on this type of pain.

The main reason for the neglect of chronic postsurgical pain in surgical journals and textbooks was well described by Macrae in 2001: “It is hard for any doctor to accept that the treatments they offer may cause morbidity, especially if they feel that they may be to blame.”Citation4 An additional reason might be that surgeons are less exposed to patients with developed chronic postsurgical pain than physicians in other specialties (eg, family medicine, pain medicine, neurology). At the same time, surgeons do have good reasons to feel that they are not to be blamed for chronic postsurgical pain. Although iatrogenic neuropathic pain caused by intraoperative nerve injury is the most common type of chronic postsurgical pain, this type of pain may also happen without any damage to a nerve trunk.Citation8,Citation9 In addition, nerve damage alone is usually not sufficient to cause chronic pain, because most of the cases of intraoperative nerve damage result in motor and sensory changes without the development of chronic pain. Chronic postsurgical pain is complex and poorly understood; there are many possible factors in its development (see reviewsCitation3,Citation8,Citation9).

It is accepted that chronic postsurgical pain is an inevitable consequence of surgery in a certain proportion of cases, like wound infection.Citation3 Chronic postsurgical pain should be discussed openly, and correct information on risk should be given to prospective patients. The incidence of chronic postsurgical pain varies very widely, up to 80% with limb amputations.Citation18 The Stabiston Textbook of SurgeryCitation13 indicates that chronic pain after open inguinal hernia repair has incidence ranging from 29% to 75%. A systematic review by Aasvang and KehletCitation2 reported that the overall incidence of chronic pain after open inguinal herniorrhaphy is 18%. In a recent large prospective study, Aasvang et alCitation19 found that the incidence of substantial pain 6 months after groin hernia repair was 12%. If patients had accurate information on their risk of chronic pain, they at least would be in the position to decide against an operation.

According to Kehlet et al,Citation8 the analysis of all possible approaches for the prevention of chronic postsurgical pain yields only one reliable solution: to use surgical techniques that avoid nerve damage. In a subsequent study,Citation19 these authors provided a rationale for selecting surgical techniques with a lower risk of chronic pain after groin hernia repair. They demonstrated that the incidence of “substantial pain” was significantly lower with laparoscopic than with open surgery (8.1% vs 16.0%, P < 0.02). A similar conclusion regarding chronic pain after laparoscopic versus open surgery was reached regarding cholecystectomy. Stiff et alCitation20 indicated that right upper quadrant chronic pain was less common after laparoscopic surgery (3.4% vs 9.7%, P < 0.05).

Although chronic postsurgical pain is relevant to many specialties (eg, surgery, anesthesiology, neurology, pain medicine, and rehabilitation medicine), risk can be decreased only by surgeons, because only they can choose to use techniques with lower risk of nerve damage. Chronic postoperative pain can also include anesthesia-related nerve injuries. Cheney et alCitation21 analyzed claims against anesthesiologists and found that 670 (16% of 4183) claims were for anesthesia-related nerve injury, including nerve injuries due to positioning of the patient after anesthesia induction. The most frequent sites of injury were the ulnar nerve (28%) and brachial plexus (20%).

Conclusion

In conclusion, chronic postsurgical pain is still insufficiently represented, especially in surgical journals and textbooks. However, there is an indication (rise in TJSI) that the interest in this topic began to increase. At present, the increase is mostly related to one specific group of surgeries: herniorrhaphy. However, it is likely that the change in the attitude toward chronic postsurgical pain will spread to other specific groups of surgeries.

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