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Dear colleagues and friends,
The Perspectives series returns, this time with an exciting discussion about antibiotic use in acute uncomplicated diverticulitis. It has been fascinating to witness this field evolve from an era where not using antibiotics was inconceivable! Dr. Anne F. Peery and Dr. Neil Stollman, both recognized experts in the matter, provide arguments to both sides of the debate, as well as much-needed nuance. As always, I welcome your comments and suggestions for future topics at ginews@gastro.org. Thank you for your support, and I hope you will enjoy the reading and learning from this as much as I did.
Charles J. Kahi, MD, MS, AGAF, is a professor of medicine at Indiana University, Indianapolis. He is also an associate editor for GI & Hepatology News.
Think carefully about when to withhold
For decades, it was standard practice to give antibiotics to all patients with acute uncomplicated diverticulitis (AUD). While most patients with a first diagnosis of AUD recover within a few weeks, a small proportion will develop a complication.1 Among generally healthy patients with an initial diagnosis of AUD, about 3% will progress to complicated diverticulitis, and about 1% will require emergency surgery within 6 months. Around another 6% of cases will develop chronic diverticulitis with ongoing diverticular inflammation that persists for weeks to months.
Because the complications are uncommon, we don’t know if antibiotics reduce the risk of progression to complicated diverticulitis, emergency surgery, or the development of chronic diverticulitis. Investigating these patient-centered and morbid outcomes would require trials enrolling thousands of patients and to following these patients for months. This trial hasn’t happened yet.
To date, only small studies have compared the use of antibiotics with no antibiotics in patients with AUD. A review sponsored by the Agency for Healthcare Research and Quality published last year concluded that the current evidence was too sparse or too inconsistent to make strong conclusions about the use of antibiotics for patients with uncomplicated diverticulitis.2
With little evidence for or against antibiotics, recent guidelines have begun to recommend that antibiotics be used selectively, rather than routinely, in patients with diverticulitis.3 “Selectively” clearly means that there are some patients who should receive antibiotics, but the guidelines are vague about who those patients are. To this end, it is safest to refer to those small, underpowered trials to identify which patients are at the greatest risk of developing a complication.1,4 The authors of those trials considered a number of groups high risk and therefore excluded them from those trials. In the absence of further definitive research, it seems clear that those groups, listed below, should therefore be selected for antibiotic treatment:
- Patients with complicated diverticulitis including paracolic extraluminal air on CT scan.
- Patients who are immunocompromised.
- Patients with a high fever, affected general condition, or clinical suspicion of sepsis.
- Patients with inflammatory bowel disease.
- Patients who are pregnant or breast feeding.
As with most clinical trials, participants in these smaller trials were younger (median age, late 50s) and healthier (63% normal, healthy patient; 34% mild systemic disease; 4% severe systemic disease) than the general population. In secondary analyses, however, several factors were independently associated with a complicated disease course after an initial diagnosis of acute uncomplicated diverticulitis. As with the first list above, the following high-risk patients should also be treated with antibiotics at diagnosis:
- Patients with American Society of Anesthesiologists scores III or IV were 4.4 times more likely to have a poor outcome, compared with those with ASA score I.
- Patients with ASA score II were 2.0 times more likely to have a poor outcome, compared with ASA score I.
- Patients with symptoms for more than 5 days at diagnosis were 3.3 times more likely to have a poor outcome, compared with those with symptoms for 5 days or less.
- Patients with vomiting at diagnosis were 3.9 times more likely to have a poor outcome, compared with those who were not vomiting.
- Patients with C-reactive protein levels higher than 140 mg/L at diagnosis were 2.9 times more likely to have a poor outcome, compared with C-reactive protein level of 140 mg/L or less.
- Patients with white blood cell count greater than 15 x 109 cells/L at diagnosis were 3.7 times more likely to have a poor outcome, compared with those with 15 x 109 cells/L.
- Patients with a longer segment (>86mm) of inflamed colon on CT scan were more likely to have a poor outcome, compared those who had a shorter segment (<65mm).
To help clinicians think about antibiotic treatment in patients with AUD, a recent American Gastroenterological Association clinical practice update provided the following advice: First, antibiotic treatment is advised in patients with uncomplicated diverticulitis who have comorbidities or are frail, who present with refractory symptoms or vomiting, or who have a C-reactive protein level greater than 140 mg/L, or baseline white blood cell count greater than 15 x 109 cells/L.5 Also, antibiotic treatment is advised in patients with complicated diverticulitis or uncomplicated diverticulitis with a fluid collection or longer segment of inflammation on CT scan. Finally, patients with uncomplicated diverticulitis who are immunosuppressed are high risk for progression to complicated diverticulitis or sepsis and should be treated with antibiotics.
The lists above clearly leave some patients with AUD who may be managed without antibiotics. These patients are otherwise healthy, have good social support, access to health care, and are experiencing a mild, self-limited episode. Avoiding antibiotics requires shared decision-making with a well-informed patient. I have patients who have embraced this approach, while others found this unacceptable. Given the current level of uncertainty in the literature, I make it my practice to offer antibiotics to any patient who feels strongly about receiving them.
As with many issues in modern medicine, the use of antibiotics in AUD is an unsettled question. Given the known harms of progression of diverticulitis, it is clearly safest to treat patients who were excluded from the small studies we have or flagged by those same studies as being at increased risk of progression. Our uncertainty also demands a shared decision-making model, filling in our patients on what we can and cannot say with confidence. As is often the case, further research is desperately needed. Until that happens, antibiotics for AUD will remain a regular part of my practice.
Anne F. Peery, MD, MSCR, is with the center for gastrointestinal biology and disease at the University of North Carolina at Chapel Hill. She has no conflicts to disclose.
References
1. Daniels L et al. Br J Surg. 2017 Jan;104(1):52-61.
2. Balk EM et al. Management of Colonic Diverticulitis. Comparative Effectiveness Review No. 233. Agency for Healthcare Research and Quality. 2020 Oct. doi: 10.23970/AHRQEPCCER233.
3. Stollman N et al. Gastroenterology. 2015 Dec;149(7):1944-9.
4. Chabok A et al. Br J Surg. 2012 Jan 30;99(4):532-9.
5. Peery AF et al. Gastroenterology. 2021 Feb;160(3):906-11.e1.
The data are robust for withholding more often
That we are engaged in a legitimate debate about the role of antibiotics in acute uncomplicated diverticulitis (AUD) is itself quite notable. In the 1999 American College of Gastroenterology Practice Guidelines,1 we did not even entertain the concept of withholding antibiotics; the only discussion points were intravenous versus oral. Fast forward 15 years, and in the 2015 American Gastroenterological Association practice guidelines (which the other contributor for this installment of Perspectives, Anne F. Peery, MD, and I worked on together) our first recommendation was that antibiotics should be used “selectively,” rather than routinely.2 This did generate some raised eyebrows and hand-wringing in the community, but our position was the result of a rigorous data analysis process and we stood by it.
In fact, Dr. Peery and I also coauthored an accompanying editorial that concluded with an important endorsement “allowing the clinician to consider withholding antibiotics from select uncomplicated patients with mild disease.” I suspect, then, that Dr. Peery and I are very much coincident in our overall thoughts here, and I’m pretty sure that neither of us would defend an “always” or “never” stance on this issue, so for this educational debate, we’re really talking about where in the middle to draw the line (that is, how to define “selectively”). To that end, I will defend the supposition that the subsequent data in support of withholding antibiotics remains robust and even more supportive of this practice in many (but certainly not all) patients with acute, uncomplicated diverticulitis.
The logic underlying selective use was based on two drivers over the past decade, one being an emerging concept that diverticular pathology was often inflammatory rather than solely infectious, coupled with a timely and very important worldwide push toward restraint of antibiotic use. A recent retrospective claims analysis of outpatient antibiotic use for immunocompetent patients with AUD did reported that the dominant antibiotic combination used, metronidazole plus a fluoroquinolone, was associated with an increased risk of Clostridioides difficile infection, compared with the far less frequently used amoxicillin/clavulanate regimen, which highlights that routine antibiotics are not without risk.3
Recently, the U.S. Agency for Healthcare Research and Quality performed a rigorous meta-analysis of this body of evidence, and summarized that “antibiotic treatment may not affect pain symptoms, length of hospital stay, recurrence risk, quality of life, or need for surgery, compared to no antibiotic treatment,” with an admitted low strength of evidence (based on four randomized, controlled trials).4
Finally, I’ll close my evidence-based case with a quote from a Clinical Practice Update just published in February 2021 in Gastroenterology: “Antibiotic treatment can be used selectively, rather than routinely, in immunocompetent patients with mild uncomplicated diverticulitis. ... Antibiotic treatment is advised in patients with uncomplicated diverticulitis who have comorbidities or are frail, who present with refractory symptoms or vomiting, or who have a [C-reactive protein] >140 mg/L or baseline [white blood cell count] > 15 x 109. Antibiotic treatment is advised in patients with complicated diverticulitis or uncomplicated diverticulitis with a fluid collection or longer segment of inflammation on CT scan.”5 I think this is most excellent advice, providing a practical and clinically useful framework for those in whom antibiotics absolutely should be used, but permitting a fairly large group to avoid antibiotics, which may carry significant harm, based on strong consistent data that does not support a benefit.
So, practically speaking, things are a bit harder for us now when our patient shows up in the ED and if found to have AUD on CT. In the “old days” (that is, the early 2000s), a patient with either clinically suspected or CT-confirmed AUD was simply given antibiotics, mostly a fluoroquinolone, and this was community standard. The only real decision tree was inpatient or outpatient. But now, I would respectfully suggest, we need to invest a bit more time on a nuanced discussion with the potential “no antibiotics” patient (for example, one without immunosuppression, severe comorbidities, or lab or imaging markers of aggressive disease). It is now appropriate to inform such a patient that the data suggest that a conservative approach will not increase their risk of complications and may well spare them antibiotic-related morbidity.
In the context of that informed discussion, factually framed by the practitioner, many patients should (and will, in my experience, although the San Francisco Bay Area may not entirely reflect the country as a whole) choose a strategy of observation. Of course, close follow-up with such patients is required, as is clear reassurance that if things “turn bad” that we’re available and antibiotics remain a salvage option. The “write a script and be done” days are over, and while withholding antibiotics may still feel dangerous or uncomfortable to the patient (or to us), the data is the data, and our patients deserve to at least be offered that option.
Neil Stollman, MD, AGAF, FACG, is chairman of the division of gastroenterology at Alta Bates Summit Medical Center in Oakland, Calif., and an associate clinical professor of medicine in the division of gastroenterology at the University of California, San Francisco. He discloses being a consultant for Cosmo Pharmaceuticals, which has a potential future diverticulitis study of a rifampin-class antibiotic.
References
1. Stollman N and Raskin JB. Am J Gastroenterol. 1999 Nov;94(11):3110-21.
2. Peery AF and Stollman N. Gastroenterology. 2015 Dec;149(7):1944-9.
3. Gaber CE et al. Ann Intern Med. 2021 Feb 23. doi: 10.7326/M20-6315.
4. Balk EM et al. Management of Colonic Diverticulitis. Comparative Effectiveness Review No. 233. Agency for Healthcare Research and Quality. October 2020. doi: 10.23970/AHRQEPCCER233.
5. Peery AF et al. Gastroenterology. 2021 Feb;160(3):906-11.e1.
Dear colleagues and friends,
The Perspectives series returns, this time with an exciting discussion about antibiotic use in acute uncomplicated diverticulitis. It has been fascinating to witness this field evolve from an era where not using antibiotics was inconceivable! Dr. Anne F. Peery and Dr. Neil Stollman, both recognized experts in the matter, provide arguments to both sides of the debate, as well as much-needed nuance. As always, I welcome your comments and suggestions for future topics at ginews@gastro.org. Thank you for your support, and I hope you will enjoy the reading and learning from this as much as I did.
Charles J. Kahi, MD, MS, AGAF, is a professor of medicine at Indiana University, Indianapolis. He is also an associate editor for GI & Hepatology News.
Think carefully about when to withhold
For decades, it was standard practice to give antibiotics to all patients with acute uncomplicated diverticulitis (AUD). While most patients with a first diagnosis of AUD recover within a few weeks, a small proportion will develop a complication.1 Among generally healthy patients with an initial diagnosis of AUD, about 3% will progress to complicated diverticulitis, and about 1% will require emergency surgery within 6 months. Around another 6% of cases will develop chronic diverticulitis with ongoing diverticular inflammation that persists for weeks to months.
Because the complications are uncommon, we don’t know if antibiotics reduce the risk of progression to complicated diverticulitis, emergency surgery, or the development of chronic diverticulitis. Investigating these patient-centered and morbid outcomes would require trials enrolling thousands of patients and to following these patients for months. This trial hasn’t happened yet.
To date, only small studies have compared the use of antibiotics with no antibiotics in patients with AUD. A review sponsored by the Agency for Healthcare Research and Quality published last year concluded that the current evidence was too sparse or too inconsistent to make strong conclusions about the use of antibiotics for patients with uncomplicated diverticulitis.2
With little evidence for or against antibiotics, recent guidelines have begun to recommend that antibiotics be used selectively, rather than routinely, in patients with diverticulitis.3 “Selectively” clearly means that there are some patients who should receive antibiotics, but the guidelines are vague about who those patients are. To this end, it is safest to refer to those small, underpowered trials to identify which patients are at the greatest risk of developing a complication.1,4 The authors of those trials considered a number of groups high risk and therefore excluded them from those trials. In the absence of further definitive research, it seems clear that those groups, listed below, should therefore be selected for antibiotic treatment:
- Patients with complicated diverticulitis including paracolic extraluminal air on CT scan.
- Patients who are immunocompromised.
- Patients with a high fever, affected general condition, or clinical suspicion of sepsis.
- Patients with inflammatory bowel disease.
- Patients who are pregnant or breast feeding.
As with most clinical trials, participants in these smaller trials were younger (median age, late 50s) and healthier (63% normal, healthy patient; 34% mild systemic disease; 4% severe systemic disease) than the general population. In secondary analyses, however, several factors were independently associated with a complicated disease course after an initial diagnosis of acute uncomplicated diverticulitis. As with the first list above, the following high-risk patients should also be treated with antibiotics at diagnosis:
- Patients with American Society of Anesthesiologists scores III or IV were 4.4 times more likely to have a poor outcome, compared with those with ASA score I.
- Patients with ASA score II were 2.0 times more likely to have a poor outcome, compared with ASA score I.
- Patients with symptoms for more than 5 days at diagnosis were 3.3 times more likely to have a poor outcome, compared with those with symptoms for 5 days or less.
- Patients with vomiting at diagnosis were 3.9 times more likely to have a poor outcome, compared with those who were not vomiting.
- Patients with C-reactive protein levels higher than 140 mg/L at diagnosis were 2.9 times more likely to have a poor outcome, compared with C-reactive protein level of 140 mg/L or less.
- Patients with white blood cell count greater than 15 x 109 cells/L at diagnosis were 3.7 times more likely to have a poor outcome, compared with those with 15 x 109 cells/L.
- Patients with a longer segment (>86mm) of inflamed colon on CT scan were more likely to have a poor outcome, compared those who had a shorter segment (<65mm).
To help clinicians think about antibiotic treatment in patients with AUD, a recent American Gastroenterological Association clinical practice update provided the following advice: First, antibiotic treatment is advised in patients with uncomplicated diverticulitis who have comorbidities or are frail, who present with refractory symptoms or vomiting, or who have a C-reactive protein level greater than 140 mg/L, or baseline white blood cell count greater than 15 x 109 cells/L.5 Also, antibiotic treatment is advised in patients with complicated diverticulitis or uncomplicated diverticulitis with a fluid collection or longer segment of inflammation on CT scan. Finally, patients with uncomplicated diverticulitis who are immunosuppressed are high risk for progression to complicated diverticulitis or sepsis and should be treated with antibiotics.
The lists above clearly leave some patients with AUD who may be managed without antibiotics. These patients are otherwise healthy, have good social support, access to health care, and are experiencing a mild, self-limited episode. Avoiding antibiotics requires shared decision-making with a well-informed patient. I have patients who have embraced this approach, while others found this unacceptable. Given the current level of uncertainty in the literature, I make it my practice to offer antibiotics to any patient who feels strongly about receiving them.
As with many issues in modern medicine, the use of antibiotics in AUD is an unsettled question. Given the known harms of progression of diverticulitis, it is clearly safest to treat patients who were excluded from the small studies we have or flagged by those same studies as being at increased risk of progression. Our uncertainty also demands a shared decision-making model, filling in our patients on what we can and cannot say with confidence. As is often the case, further research is desperately needed. Until that happens, antibiotics for AUD will remain a regular part of my practice.
Anne F. Peery, MD, MSCR, is with the center for gastrointestinal biology and disease at the University of North Carolina at Chapel Hill. She has no conflicts to disclose.
References
1. Daniels L et al. Br J Surg. 2017 Jan;104(1):52-61.
2. Balk EM et al. Management of Colonic Diverticulitis. Comparative Effectiveness Review No. 233. Agency for Healthcare Research and Quality. 2020 Oct. doi: 10.23970/AHRQEPCCER233.
3. Stollman N et al. Gastroenterology. 2015 Dec;149(7):1944-9.
4. Chabok A et al. Br J Surg. 2012 Jan 30;99(4):532-9.
5. Peery AF et al. Gastroenterology. 2021 Feb;160(3):906-11.e1.
The data are robust for withholding more often
That we are engaged in a legitimate debate about the role of antibiotics in acute uncomplicated diverticulitis (AUD) is itself quite notable. In the 1999 American College of Gastroenterology Practice Guidelines,1 we did not even entertain the concept of withholding antibiotics; the only discussion points were intravenous versus oral. Fast forward 15 years, and in the 2015 American Gastroenterological Association practice guidelines (which the other contributor for this installment of Perspectives, Anne F. Peery, MD, and I worked on together) our first recommendation was that antibiotics should be used “selectively,” rather than routinely.2 This did generate some raised eyebrows and hand-wringing in the community, but our position was the result of a rigorous data analysis process and we stood by it.
In fact, Dr. Peery and I also coauthored an accompanying editorial that concluded with an important endorsement “allowing the clinician to consider withholding antibiotics from select uncomplicated patients with mild disease.” I suspect, then, that Dr. Peery and I are very much coincident in our overall thoughts here, and I’m pretty sure that neither of us would defend an “always” or “never” stance on this issue, so for this educational debate, we’re really talking about where in the middle to draw the line (that is, how to define “selectively”). To that end, I will defend the supposition that the subsequent data in support of withholding antibiotics remains robust and even more supportive of this practice in many (but certainly not all) patients with acute, uncomplicated diverticulitis.
The logic underlying selective use was based on two drivers over the past decade, one being an emerging concept that diverticular pathology was often inflammatory rather than solely infectious, coupled with a timely and very important worldwide push toward restraint of antibiotic use. A recent retrospective claims analysis of outpatient antibiotic use for immunocompetent patients with AUD did reported that the dominant antibiotic combination used, metronidazole plus a fluoroquinolone, was associated with an increased risk of Clostridioides difficile infection, compared with the far less frequently used amoxicillin/clavulanate regimen, which highlights that routine antibiotics are not without risk.3
Recently, the U.S. Agency for Healthcare Research and Quality performed a rigorous meta-analysis of this body of evidence, and summarized that “antibiotic treatment may not affect pain symptoms, length of hospital stay, recurrence risk, quality of life, or need for surgery, compared to no antibiotic treatment,” with an admitted low strength of evidence (based on four randomized, controlled trials).4
Finally, I’ll close my evidence-based case with a quote from a Clinical Practice Update just published in February 2021 in Gastroenterology: “Antibiotic treatment can be used selectively, rather than routinely, in immunocompetent patients with mild uncomplicated diverticulitis. ... Antibiotic treatment is advised in patients with uncomplicated diverticulitis who have comorbidities or are frail, who present with refractory symptoms or vomiting, or who have a [C-reactive protein] >140 mg/L or baseline [white blood cell count] > 15 x 109. Antibiotic treatment is advised in patients with complicated diverticulitis or uncomplicated diverticulitis with a fluid collection or longer segment of inflammation on CT scan.”5 I think this is most excellent advice, providing a practical and clinically useful framework for those in whom antibiotics absolutely should be used, but permitting a fairly large group to avoid antibiotics, which may carry significant harm, based on strong consistent data that does not support a benefit.
So, practically speaking, things are a bit harder for us now when our patient shows up in the ED and if found to have AUD on CT. In the “old days” (that is, the early 2000s), a patient with either clinically suspected or CT-confirmed AUD was simply given antibiotics, mostly a fluoroquinolone, and this was community standard. The only real decision tree was inpatient or outpatient. But now, I would respectfully suggest, we need to invest a bit more time on a nuanced discussion with the potential “no antibiotics” patient (for example, one without immunosuppression, severe comorbidities, or lab or imaging markers of aggressive disease). It is now appropriate to inform such a patient that the data suggest that a conservative approach will not increase their risk of complications and may well spare them antibiotic-related morbidity.
In the context of that informed discussion, factually framed by the practitioner, many patients should (and will, in my experience, although the San Francisco Bay Area may not entirely reflect the country as a whole) choose a strategy of observation. Of course, close follow-up with such patients is required, as is clear reassurance that if things “turn bad” that we’re available and antibiotics remain a salvage option. The “write a script and be done” days are over, and while withholding antibiotics may still feel dangerous or uncomfortable to the patient (or to us), the data is the data, and our patients deserve to at least be offered that option.
Neil Stollman, MD, AGAF, FACG, is chairman of the division of gastroenterology at Alta Bates Summit Medical Center in Oakland, Calif., and an associate clinical professor of medicine in the division of gastroenterology at the University of California, San Francisco. He discloses being a consultant for Cosmo Pharmaceuticals, which has a potential future diverticulitis study of a rifampin-class antibiotic.
References
1. Stollman N and Raskin JB. Am J Gastroenterol. 1999 Nov;94(11):3110-21.
2. Peery AF and Stollman N. Gastroenterology. 2015 Dec;149(7):1944-9.
3. Gaber CE et al. Ann Intern Med. 2021 Feb 23. doi: 10.7326/M20-6315.
4. Balk EM et al. Management of Colonic Diverticulitis. Comparative Effectiveness Review No. 233. Agency for Healthcare Research and Quality. October 2020. doi: 10.23970/AHRQEPCCER233.
5. Peery AF et al. Gastroenterology. 2021 Feb;160(3):906-11.e1.
Dear colleagues and friends,
The Perspectives series returns, this time with an exciting discussion about antibiotic use in acute uncomplicated diverticulitis. It has been fascinating to witness this field evolve from an era where not using antibiotics was inconceivable! Dr. Anne F. Peery and Dr. Neil Stollman, both recognized experts in the matter, provide arguments to both sides of the debate, as well as much-needed nuance. As always, I welcome your comments and suggestions for future topics at ginews@gastro.org. Thank you for your support, and I hope you will enjoy the reading and learning from this as much as I did.
Charles J. Kahi, MD, MS, AGAF, is a professor of medicine at Indiana University, Indianapolis. He is also an associate editor for GI & Hepatology News.
Think carefully about when to withhold
For decades, it was standard practice to give antibiotics to all patients with acute uncomplicated diverticulitis (AUD). While most patients with a first diagnosis of AUD recover within a few weeks, a small proportion will develop a complication.1 Among generally healthy patients with an initial diagnosis of AUD, about 3% will progress to complicated diverticulitis, and about 1% will require emergency surgery within 6 months. Around another 6% of cases will develop chronic diverticulitis with ongoing diverticular inflammation that persists for weeks to months.
Because the complications are uncommon, we don’t know if antibiotics reduce the risk of progression to complicated diverticulitis, emergency surgery, or the development of chronic diverticulitis. Investigating these patient-centered and morbid outcomes would require trials enrolling thousands of patients and to following these patients for months. This trial hasn’t happened yet.
To date, only small studies have compared the use of antibiotics with no antibiotics in patients with AUD. A review sponsored by the Agency for Healthcare Research and Quality published last year concluded that the current evidence was too sparse or too inconsistent to make strong conclusions about the use of antibiotics for patients with uncomplicated diverticulitis.2
With little evidence for or against antibiotics, recent guidelines have begun to recommend that antibiotics be used selectively, rather than routinely, in patients with diverticulitis.3 “Selectively” clearly means that there are some patients who should receive antibiotics, but the guidelines are vague about who those patients are. To this end, it is safest to refer to those small, underpowered trials to identify which patients are at the greatest risk of developing a complication.1,4 The authors of those trials considered a number of groups high risk and therefore excluded them from those trials. In the absence of further definitive research, it seems clear that those groups, listed below, should therefore be selected for antibiotic treatment:
- Patients with complicated diverticulitis including paracolic extraluminal air on CT scan.
- Patients who are immunocompromised.
- Patients with a high fever, affected general condition, or clinical suspicion of sepsis.
- Patients with inflammatory bowel disease.
- Patients who are pregnant or breast feeding.
As with most clinical trials, participants in these smaller trials were younger (median age, late 50s) and healthier (63% normal, healthy patient; 34% mild systemic disease; 4% severe systemic disease) than the general population. In secondary analyses, however, several factors were independently associated with a complicated disease course after an initial diagnosis of acute uncomplicated diverticulitis. As with the first list above, the following high-risk patients should also be treated with antibiotics at diagnosis:
- Patients with American Society of Anesthesiologists scores III or IV were 4.4 times more likely to have a poor outcome, compared with those with ASA score I.
- Patients with ASA score II were 2.0 times more likely to have a poor outcome, compared with ASA score I.
- Patients with symptoms for more than 5 days at diagnosis were 3.3 times more likely to have a poor outcome, compared with those with symptoms for 5 days or less.
- Patients with vomiting at diagnosis were 3.9 times more likely to have a poor outcome, compared with those who were not vomiting.
- Patients with C-reactive protein levels higher than 140 mg/L at diagnosis were 2.9 times more likely to have a poor outcome, compared with C-reactive protein level of 140 mg/L or less.
- Patients with white blood cell count greater than 15 x 109 cells/L at diagnosis were 3.7 times more likely to have a poor outcome, compared with those with 15 x 109 cells/L.
- Patients with a longer segment (>86mm) of inflamed colon on CT scan were more likely to have a poor outcome, compared those who had a shorter segment (<65mm).
To help clinicians think about antibiotic treatment in patients with AUD, a recent American Gastroenterological Association clinical practice update provided the following advice: First, antibiotic treatment is advised in patients with uncomplicated diverticulitis who have comorbidities or are frail, who present with refractory symptoms or vomiting, or who have a C-reactive protein level greater than 140 mg/L, or baseline white blood cell count greater than 15 x 109 cells/L.5 Also, antibiotic treatment is advised in patients with complicated diverticulitis or uncomplicated diverticulitis with a fluid collection or longer segment of inflammation on CT scan. Finally, patients with uncomplicated diverticulitis who are immunosuppressed are high risk for progression to complicated diverticulitis or sepsis and should be treated with antibiotics.
The lists above clearly leave some patients with AUD who may be managed without antibiotics. These patients are otherwise healthy, have good social support, access to health care, and are experiencing a mild, self-limited episode. Avoiding antibiotics requires shared decision-making with a well-informed patient. I have patients who have embraced this approach, while others found this unacceptable. Given the current level of uncertainty in the literature, I make it my practice to offer antibiotics to any patient who feels strongly about receiving them.
As with many issues in modern medicine, the use of antibiotics in AUD is an unsettled question. Given the known harms of progression of diverticulitis, it is clearly safest to treat patients who were excluded from the small studies we have or flagged by those same studies as being at increased risk of progression. Our uncertainty also demands a shared decision-making model, filling in our patients on what we can and cannot say with confidence. As is often the case, further research is desperately needed. Until that happens, antibiotics for AUD will remain a regular part of my practice.
Anne F. Peery, MD, MSCR, is with the center for gastrointestinal biology and disease at the University of North Carolina at Chapel Hill. She has no conflicts to disclose.
References
1. Daniels L et al. Br J Surg. 2017 Jan;104(1):52-61.
2. Balk EM et al. Management of Colonic Diverticulitis. Comparative Effectiveness Review No. 233. Agency for Healthcare Research and Quality. 2020 Oct. doi: 10.23970/AHRQEPCCER233.
3. Stollman N et al. Gastroenterology. 2015 Dec;149(7):1944-9.
4. Chabok A et al. Br J Surg. 2012 Jan 30;99(4):532-9.
5. Peery AF et al. Gastroenterology. 2021 Feb;160(3):906-11.e1.
The data are robust for withholding more often
That we are engaged in a legitimate debate about the role of antibiotics in acute uncomplicated diverticulitis (AUD) is itself quite notable. In the 1999 American College of Gastroenterology Practice Guidelines,1 we did not even entertain the concept of withholding antibiotics; the only discussion points were intravenous versus oral. Fast forward 15 years, and in the 2015 American Gastroenterological Association practice guidelines (which the other contributor for this installment of Perspectives, Anne F. Peery, MD, and I worked on together) our first recommendation was that antibiotics should be used “selectively,” rather than routinely.2 This did generate some raised eyebrows and hand-wringing in the community, but our position was the result of a rigorous data analysis process and we stood by it.
In fact, Dr. Peery and I also coauthored an accompanying editorial that concluded with an important endorsement “allowing the clinician to consider withholding antibiotics from select uncomplicated patients with mild disease.” I suspect, then, that Dr. Peery and I are very much coincident in our overall thoughts here, and I’m pretty sure that neither of us would defend an “always” or “never” stance on this issue, so for this educational debate, we’re really talking about where in the middle to draw the line (that is, how to define “selectively”). To that end, I will defend the supposition that the subsequent data in support of withholding antibiotics remains robust and even more supportive of this practice in many (but certainly not all) patients with acute, uncomplicated diverticulitis.
The logic underlying selective use was based on two drivers over the past decade, one being an emerging concept that diverticular pathology was often inflammatory rather than solely infectious, coupled with a timely and very important worldwide push toward restraint of antibiotic use. A recent retrospective claims analysis of outpatient antibiotic use for immunocompetent patients with AUD did reported that the dominant antibiotic combination used, metronidazole plus a fluoroquinolone, was associated with an increased risk of Clostridioides difficile infection, compared with the far less frequently used amoxicillin/clavulanate regimen, which highlights that routine antibiotics are not without risk.3
Recently, the U.S. Agency for Healthcare Research and Quality performed a rigorous meta-analysis of this body of evidence, and summarized that “antibiotic treatment may not affect pain symptoms, length of hospital stay, recurrence risk, quality of life, or need for surgery, compared to no antibiotic treatment,” with an admitted low strength of evidence (based on four randomized, controlled trials).4
Finally, I’ll close my evidence-based case with a quote from a Clinical Practice Update just published in February 2021 in Gastroenterology: “Antibiotic treatment can be used selectively, rather than routinely, in immunocompetent patients with mild uncomplicated diverticulitis. ... Antibiotic treatment is advised in patients with uncomplicated diverticulitis who have comorbidities or are frail, who present with refractory symptoms or vomiting, or who have a [C-reactive protein] >140 mg/L or baseline [white blood cell count] > 15 x 109. Antibiotic treatment is advised in patients with complicated diverticulitis or uncomplicated diverticulitis with a fluid collection or longer segment of inflammation on CT scan.”5 I think this is most excellent advice, providing a practical and clinically useful framework for those in whom antibiotics absolutely should be used, but permitting a fairly large group to avoid antibiotics, which may carry significant harm, based on strong consistent data that does not support a benefit.
So, practically speaking, things are a bit harder for us now when our patient shows up in the ED and if found to have AUD on CT. In the “old days” (that is, the early 2000s), a patient with either clinically suspected or CT-confirmed AUD was simply given antibiotics, mostly a fluoroquinolone, and this was community standard. The only real decision tree was inpatient or outpatient. But now, I would respectfully suggest, we need to invest a bit more time on a nuanced discussion with the potential “no antibiotics” patient (for example, one without immunosuppression, severe comorbidities, or lab or imaging markers of aggressive disease). It is now appropriate to inform such a patient that the data suggest that a conservative approach will not increase their risk of complications and may well spare them antibiotic-related morbidity.
In the context of that informed discussion, factually framed by the practitioner, many patients should (and will, in my experience, although the San Francisco Bay Area may not entirely reflect the country as a whole) choose a strategy of observation. Of course, close follow-up with such patients is required, as is clear reassurance that if things “turn bad” that we’re available and antibiotics remain a salvage option. The “write a script and be done” days are over, and while withholding antibiotics may still feel dangerous or uncomfortable to the patient (or to us), the data is the data, and our patients deserve to at least be offered that option.
Neil Stollman, MD, AGAF, FACG, is chairman of the division of gastroenterology at Alta Bates Summit Medical Center in Oakland, Calif., and an associate clinical professor of medicine in the division of gastroenterology at the University of California, San Francisco. He discloses being a consultant for Cosmo Pharmaceuticals, which has a potential future diverticulitis study of a rifampin-class antibiotic.
References
1. Stollman N and Raskin JB. Am J Gastroenterol. 1999 Nov;94(11):3110-21.
2. Peery AF and Stollman N. Gastroenterology. 2015 Dec;149(7):1944-9.
3. Gaber CE et al. Ann Intern Med. 2021 Feb 23. doi: 10.7326/M20-6315.
4. Balk EM et al. Management of Colonic Diverticulitis. Comparative Effectiveness Review No. 233. Agency for Healthcare Research and Quality. October 2020. doi: 10.23970/AHRQEPCCER233.
5. Peery AF et al. Gastroenterology. 2021 Feb;160(3):906-11.e1.