Case Report Open Access
Copyright ©The Author(s) 2020. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Gastroenterol. Mar 7, 2020; 26(9): 984-991
Published online Mar 7, 2020. doi: 10.3748/wjg.v26.i9.984
Two case reports of novel syndrome of bizarre performance of gastrointestinal endoscopy due to toxic encephalopathy of endoscopists among 181767 endoscopies in a 13-year-university hospital review: Endoscopists, first do no harm!
Mitchell S Cappell, Division of Gastroenterology & Hepatology, William Beaumont Hospital, Royal Oak, MI 48073, United States
Mitchell S Cappell, Oakland University William Beaumont School of Medicine, Royal Oak, MI 48073, United States
ORCID number: Mitchell S Cappell (0000-0003-3445-5428).
Author contributions: Cappell MS designed the research, performed the research, analyzed the data, and wrote the paper.
Informed consent statement: Informed written consent was obtained from the patients for publication of this report and accompanying images.
Conflict-of-interest statement: None. Dr. Cappell, as a consultant of the United States Food and Drug Administration (FDA) Advisory Committee for Gastrointestinal Drugs, affirms that this paper does not discuss any proprietary confidential pharmaceutical data submitted to the FDA and reviewed by Dr. Cappell. Dr. Cappell was until 2 years ago a member of the speaker’s bureau for AstraZeneca and Daiichi Sankyo, co-marketers of Movantik. Dr. Cappell has had one-time consultancies for Mallinckrodt and Shire > 1 year ago. This work does not discuss any drug manufactured or marketed by AstraZeneca, Daiichi Sankyo, Shire, or Mallinckrodt.
CARE Checklist (2016) statement: The author has read the CARE Checklist (2016), and the manuscript was prepared and revised according to the CARE Checklist (2016).
Open-Access: This article is an open-access article that was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution NonCommercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See:
Corresponding author: Mitchell S Cappell, MD, PhD, Professor, Division of Gastroenterology and Hepatology, William Beaumont Hospital, MOB Suite 602, Thirteen Mile Rd, Royal Oak, MI 48073, United States.
Received: October 16, 2019
Peer-review started: October 16, 2019
First decision: November 22, 2019
Revised: December 4, 2019
Accepted: February 21, 2020
Article in press: February 21, 2020
Published online: March 7, 2020


Although deficient procedures performed by impaired physicians have been reported for many specialists, such as surgeons and anesthesiologists, systematic literature review failed to reveal any reported cases of deficient endoscopies performed by gastroenterologists due to toxic encephalopathy. Yet gastroenterologists, like any individual, can rarely suffer acute-changes-in-mental-status from medical disorders, and these disorders may first manifest while performing gastrointestinal endoscopy because endoscopy comprises so much of their workday.


Among 181767 endoscopies performed by gastroenterologists at William-Beaumont-Hospital at Royal-Oak, two endoscopies were performed by normally highly qualified endoscopists who manifested bizarre endoscopic interpretation and technique during these endoscopies due to toxic encephalopathy. Case-1-endoscopist repeatedly insisted that gastric polyps were colonic polyps, and absurdly “pressed” endoscopic steering dials to “take” endoscopic photographs; Case-2-endoscopist repeatedly insisted that had intubated duodenum when intubating antrum, and wildly turned steering dials and bumped endoscopic tip forcefully against antral wall. Endoscopy nurses recognized endoscopists as impaired and informed endoscopy-unit-nurse-manager. She called Chief-of-Gastroenterology who advised endoscopists to terminate their esophagogastroduodenoscopies (fulfilling ethical imperative of “physician, first-do-no-harm”), and go to emergency room for medical evaluation. Both endoscopists complied. In-hospital-work-up revealed toxic encephalopathy in both from: case-1-urosepsis and left-ureteral-impacted-nephrolithiasis; and case-2-dehydration and accidental ingestion of suspected illicit drug given by unidentified stranger. Endoscopists rapidly recovered with medical therapy.


This rare syndrome (0.0011% of endoscopies) may manifest abruptly as bizarre endoscopic interpretation and technique due to impairment of endoscopists by toxic encephalopathy. Recommended management (followed in both cases): 1-recognize incident as medical emergency demanding immediate action to prevent iatrogenic patient injury; 2- inform Chief-of-Gastroenterology; and 3-immediately intervene to abort endoscopy to protect patient. Syndromic features require further study.

Key Words: Endoscopy, Iatrogenic injury, Medical ethics, Hippocratic Oath, Quality improvement, Medical malpractice, Morbidity and mortality

Core tip: Two novel cases are reported of impaired endoscopists manifesting bizarre-endoscopic-interpretation-and-technique due to toxic encephalopathy among 181767 endoscopies performed at William-Beaumont-Hospital-Royal-Oak. Case-1-endoscopist repeatedly insisted that gastric polyps were colonic polyps, and absurdly “pressed” endoscopic steering dials to photograph gastric lesions. Case-2-endoscopist repeatedly insisted that had intubated duodenum when intubating antrum, and erratically turned steering dials and bumped endoscopic tip against antral wall. Endoscopists were advised to terminate their esophagogastroduodenoscopies, fulfilling ethical imperative: “physician-first-do-no-harm”. In-hospital-work-up revealed toxic encephalopathies from urosepsis, or inadvertently ingesting “illicit drug”. Both endoscopists rapidly recovered with medical therapy. These potential-medical-emergencies require aborting endoscopy to prevent iatrogenic patient injury.


Gastroenterologists (GIs), like any individual, can suffer acute-changes-in-mental-status from medical disorders, and these medical disorders may rarely first manifest while performing gastrointestinal (GI) endoscopy because endoscopy comprises so much of their workday. Review of 181767 GI endoscopies performed by GIs at a large university teaching hospital revealed 2 cases (0.0011%) of acute-change-in-mental-status by GIs first manifesting during endoscopy, as reported herein. This novel work reports syndromic features, including nature of bizarre endoscopic performance, health professionals who reported incidents, and medical causes of transient impairment; recommends chain-of-command to manage medical crises; and emphasizes the need to immediately abort endoscopy to prevent iatrogenic patient injury (fulfilling ethical imperative of Hippocratic Oath, “Physician, first do no harm!”)[1].


Dr. Cappell prospectively intervened administratively during both incidents, and was involved soon thereafter in investigating the incidents for quality assurance as Chief-of-Gastroenterology (GI), November 2006-September 2019, at William Beaumont Hospital, Royal Oak, a large university hospital of Oakland University William Beaumont School of Medicine. Computerized search of all outpatient and inpatient esophagogastroduodenoscopies (EGDs), sigmoidoscopies, and colonoscopies performed in hospital endoscopy unit by GIs using Provations (800 Washington Avenue North, Minneapolis, MN 555401), a computerized endoscopy reporting system (using terms “abort”, “aborted”, “incomplete”, “stop”, “stopped”, “terminate”, “terminated”, “impaired”, or “unsatisfactory” [endoscopy /endoscopist]), did not reveal any more aborted endoscopies because of impaired endoscopists. Study excluded surgeons performing GI endoscopy because Chief-of-GI lacked prospective knowledge of such incidents due to a separate quality assurance pathway. This study was exempted/approved by the William Beaumont Hospital Institutional Review Board on 9/4/19. Dr. Cappell claims expertise in quality assurance based on professional experience as senior GI administrator (1995-2019) at the five following teaching hospitals (with medical residencies and GI fellowships): Maimonides Hospital, Brooklyn, NY; Woodhull Hospital, Brooklyn, NY; Saint Barnabas Hospital, Bronx, NY; Albert Einstein Hospital, Philadelphia, PA; and William Beaumont Hospital, Royal Oak, MI.

Literature related to impaired endoscopists at endoscopy was systematically searched using Pubmed and Ovid with the following terms [“incapacitated” or “impaired” or “incompetent”] AND [“gastroenterologist” or “endoscopist” or “surgeon” or “physician” or “doctor”]. Abstracts of all identified publications were reviewed. This search failed to reveal prior publications on impaired endoscopists, although several papers were identified about impaired physicians, surgeons, anesthesiologists, or other specialists due to alcoholism or drug dependency.

For clarification, the subjects of these two case reports are not the patients undergoing the endoscopies, but the gastroenterologists performing the endoscopies.

Case report 1

Chief-of-GI was paged stat by the endoscopy-unit-nurse-administrator about an elderly, highly experienced, and normally, highly competent endoscopist who suffered an acute-change-in-mental-status while performing EGD manifested by bizarre behavior, including repeatedly insisting that gastric polyps were in colon, and attempting to endoscopically photograph these polyps by absurdly pressing the steering dials instead of the photography button. Endoscopy nurse recognized this behavior as bizarre and immediately notified endoscopy-unit-nurse-administrator. The summoned Chief-of-GI noted the endoscopist was confused, dizzy, and unsteady; and advised this endoscopist to immediately abort the EGD, cancel upcoming endoscopies, and go to emergency room (ER) for medical evaluation. The endoscopist complied. The Chief-of-GI accompanied the impaired endoscopist to ER.

The impaired endoscopist was experiencing progressive left lower quadrant abdominal pain, hardly eating or drinking fluids, and experiencing orthostatic dizziness during the past 24 h. He had chronic, benign, prostatic hypertrophy. He had no history of neuropsychiatric-disorders/illicit-drug-use/alcoholism/prior similar episodes. Family history was noncontributory. He was bending over in pain and clutching his left lower abdominal quadrant while walking several steps to a waiting wheelchair. Physical examination on admission revealed blood pressure of 181/85 mmHg, pulse of 84 beats/min with orthostasis, respiratory rate of 18 breaths/min, and temperature of 37.9 °C. Mucous membranes were dry, skin turgor was deceased, and axillary sweat was absent. The abdomen was soft, nontender, non-distended, and without hepatosplenomegaly. The left flank was moderately tender. Digital rectal examination revealed guaiac negative stool, and diffuse severe prostatomegaly, without induration. He was moderately confused; oriented to place, person, and year but not month and day. He was conversant and cognizant of his confusion. Formal neurologic examination by a neurologist revealed no other neurologic abnormalities.

There were 16800 leukocytes/mm3 (normal: 3500-10100 leukocytes/mm3), and 13700 neutrophils/mm3 (normal: 1600-7200 neutrophils/mm3). Hemoglobin was within normal limits. Levels of routine serum electrolytes, serum glucose, basic metabolic panel, lactic acid, and routine thyroid function tests were within normal limits. An electrocardiogram (EKG) and serial troponin levels showed no cardiac ischemia or cardiac arrhythmia. Blood alcohol level and urine screen for 8 commonly abused drugs were negative.

Blood urea nitrogen (BUN) level was 19 mg/dL (normal: 8-22 mg/dL), and creatinine was 2.01 mg/dL (normal: 0.60-1.40 mg/dL). Abdomino-pelvic CT revealed moderate, left-sided, hydroureteronephrosis, mild left perinephric stranding, a 5.5-mm-wide-radioopaque-stone obstructing the left mid-ureter (Figure 1A and B), and an extremely large prostate gland protruding into the bladder (Figure 1C). Urinalysis revealed ketonuria (likely from early starvation ketosis), and microscopic hematuria (from kidney stone). Head computerized tomography (CT) and brain magnetic resonance angiography (MRA) showed unremarkable cerebral anatomy and cerebral vessels, respectively.

Figure 1
Figure 1 Abdomino-pelvic computed tomography without contrast. A: Left kidney stone. Sagittal section of abdomino-pelvic computerized tomograph without IV contrast (not administered due to elevated creatinine) performed on admission in patient reported as case-1 demonstrates a 5.5-mm-wide, round, radiopaque, kidney stone in left ureter (arrow), just rostral to the level of left iliac crest; B: Left-sided hydroureteronephrosis. Axial section of the same abdomino-pelvic CT at level of mid-kidneys shows that this stone has caused left ureteral obstruction, left-sided hydroureter, and left-sided hydronephrosis. Note the severely dilated left renal calyx (vertical arrow) and compressed left renal parenchyma (horizontal arrow), as compared to normal-sized right calyx and right kidney; C: Moderately severe diffuse prostatomegaly. Axial section of the same abdomino-pelvic CT at level of rectum reveals moderately severe diffuse prostatomegaly, as demonstrated by the prostate compressing the bladder [arrow shows upper (ventral) margin of prostrate compressing bladder].
Case report 2

The Chief-of-GI was paged stat by the endoscopy-unit-nurse-administrator about a middle-aged, highly experienced, and normally highly competent endoscopist who suffered an acute-change-in-mental-status while performing EGD manifested by bizarre behavior, including insisting that he was intubated in duodenum when he had actually intubated gastric antrum, and wildly turning the steering dials and bumping forcefully against antral wall while trying to intubate the pylorus. The prior evening, he had taken diazepam 5 mg orally, and drank 24 ounces of beer to relieve lower back pain after twisting his lower back while carrying a heavy pile of medical charts (incident preceded advent of electronic medical records). The endoscopist had not eaten any food or drank any fluids for 16 h before EGD because of residual back pain. After performing one EGD in the morning without incident, he took two purported “motrin” pills of unknown dosage donated by an unidentified stranger (this event was witnessed). He soon became dizzy and disoriented. The endoscopy nurse noted the endoscopist’s bizarre behavior during the next EGD and immediately notified the endoscopy-unit-nurse-administrator who paged the Chief-of-GI stat. After noting that the endoscopist was confused, dizzy, lethargic, unsteady, and oriented to place and person but not time, the summoned Chief-of-GI advised the endoscopist to abort the EGD, cancel upcoming endoscopies, and go to ER for medical evaluation. The endoscopist complied. The Chief-of-GI accompanied the impaired endoscopist to ER.

Past medical history revealed chronic back pain for which he intermittently took motrin 200 mg orally, three times daily; and mild anxiety occasionally requiring diazepam, 5 mg orally, as needed. The endoscopist had no history of neuropsychiatric-disorders/illicit-drug-use/alcoholism/prior similar episodes. Family history was noncontributory. Upon evaluation in ER 30 min later, the endoscopist was asymptomatic and appeared completely recovered from his change-in-mental-status. His blood pressure was 130/91 mmHg, pulse was 82 beats/min and regular, respiratory rate was 18 breaths/min, and temperature was 36.2 °C. He had dry mucous membranes, absent axillary sweat, and poor skin turgor. His abdomen was soft and nontender. He was alert; oriented to time, place, and person; and not anymore confused. Formal neurologic examination by a neurologist revealed no neurologic abnormalities. Routine serum electrolytes, basic metabolic panel, BUN, creatinine, complete hemogram, and urinalysis were within normal limits. Blood alcohol level and urine screen for 8 commonly abused drugs were negative. EKG and serial troponin levels showed no cardiac ischemia or cardiac arrhythmias. Head CT and brain MRA with IV contrast revealed no abnormalities.

Case report 1

Endoscopist was confused and disoriented at EGD due to toxic encephalopathy secondary to kidney stone obstructing left ureter, complicated by left-sided hydroureteronephrosis, urosepsis, and dehydration.

Case report 2

Transient confusion during EGD attributed to brief toxic encephalopathy attributed to potential neuropsychiatric effects of alleged “motrin” pills given by a stranger, exacerbated by dehydration and acute back pain.

Case report 1

Endoscopist received profuse IV hydration, and IV ceftriaxone 1 g/d for presumed urosepsis. Cystourethroscopy revealed left, mid-ureteral obstruction from an impacted kidney stone. A J-stent was inserted into left ureter to bypass the ureteral obstruction, and stone removal was deferred. Urine culture obtained from left ureter during cystourethroscopy revealed > 10000 colony-forming-units/mL (normal: < 10000 cfu/mL). He was discharged 1 d later when the creatinine level declined to 1.8 mg/dL, and received trimethoprim/sulfamethoxazole orally for 5 d as an outpatient. At repeat cystourethroscopy 10 d later, the left ureteral stone was successfully extracted via basket.

Case report 2

Patient was admitted overnight for vigorous hydration and observation.

Case report 1

The patient’s creatinine and BUN levels rapidly normalized. Chemical analysis revealed a calcium oxalate monohydrate and dehydrate stone. The endoscopist resumed seeing patients and performing GI endoscopy 10 d later with no neurologic sequelae.

Case report 2

Patient became asymptomatic and was discharged the next morning. He resumed seeing patients and performing endoscopy 3 d after hospital discharge, with no neurologic sequelae.


Both cases exhibited five notable syndromic features. First, this syndrome is rare (0.0011% of GI endoscopies performed by GIs). This is not surprising because GIs performing endoscopy are generally healthy. Contrariwise, this syndrome can rarely occur because GIs, like other individuals, are subject to human frailties, and these frailties could manifest during endoscopy, which comprises a large part of their workday. Second, impairment first manifested abruptly as bizarre endoscopic interpretation and technique at endoscopy. Changes-in-mental-status may only be first appreciated during endoscopy because endoscopy requires sophisticated cognitive and technical skills which can be readily affected by a change-in-mental-status. Third, in both cases endoscopy nurses first detected this impairment. Endoscopy nurses are highly trained, highly focused on endoscopy, and can directly view endoscopic findings by video-monitor, to detect aberrant cognitive and technical behavior by endoscopists. Both nurses recognizing bizarre behavior were very experienced (> 8 years nursing experience). Fourth, in both cases the change-in-mental-status was caused by metabolic encephalopathy: Case-1-from urosepsis from left ureteral obstruction from kidney stone impacted in left ureter (prostatomegaly a possible predisposing factor), which was compounded by dehydration and ketonuria; and case-2-occurring soon after taking two putative “motrin” pills given by a stranger and resolving soon thereafter, suggesting that the putative “motrin” pills were the proximate cause of impairment, probably exacerbated by dehydration. The impaired endoscopist in case-2 speculated that the pill was not “motrin” but a neuropsychiatric drug which could have been administered mistakenly or deliberately (as in “slipping a Mickey Finn” alluding to Mickey Finn, a bartender who would spike alcoholic drinks with chloral hydrate to make clients sleepy to rob them later)[2]. Change-in-mental-status was not likely an allergic reaction to motrin because the endoscopist had previously taken motrin frequently without toxicity. Fifth, both impaired endoscopists rapidly recovered from their toxic encephalopathies, and resumed seeing patients and performing endoscopy within 10 d after hospitalization.

The following five administrative actions are recommended to manage the crises (Figure 2). First, hospital administrators should recognize such incidents as medical emergencies because of potential iatrogenic patient injury (e.g. GI perforation) by impaired endoscopists. For example, the second impaired endoscopist wildly turned the steering dials, and forcefully bumped the endoscopic tip against the antral wall. These effects of metabolic encephalopathy are biologically reasonable. Like a drunken driver crashing a car due to erratic driving, an impaired endoscopist may bump the endoscopic tip forcefully against the GI wall due to erratic steering and potentially cause GI perforation. Inebriated drivers often fail the field sobriety test because they cannot walk in a straight line. The neurologist, Oliver Sacks, published numerous case reports of bizarre behavior due to neurologic impairments, such as a patient who mistook his wife for a hat due to visual agnosia[3]. Second, this work illustrates a reasonable chain-of-command for crisis management: Endoscopy nurse to endoscopy-unit-nurse-administrator to Chief-of-GI. This avoids endoscopy nurses awkwardly confronting endoscopists about faulty endoscopic technique, and defers action until after evaluation by Chief-of-GI, who as a practitioner and peer of impaired endoscopists, should be highly familiar with endoscopic standards of care. Third, the Chief-of-GI was paged stat, and responded immediately, as required for an emergency. Fourth, the Chief-of-GI strongly advised impaired endoscopists in both cases to abort the EGDs, and cancel all upcoming endoscopies to prevent iatrogenic injury (following ethical imperative of “Physician, first do no harm!”)[1]; this was accomplished by persuasion. Fifth, impaired endoscopists should be advised to go to ER as recommended for diagnosis and treatment of acute-changes-in-mental-status.

Figure 2
Figure 2 Algorithm. Algorithm summarizing steps to recognize and manage bizarre performance of gastrointestinal endoscopy by an impaired gastroenterologist-endoscopist. The first three steps relate to syndrome recognition. The next two steps describe recommended actions by Chief of Gastroenterology. The last step relates to recommended patient work-up in emergency room. See Discussion section and Supplementary Table 1 for fuller discussion of syndrome recognition and management.

The following two optional recommendations are proposed. First, if the patient agrees, the Chief-of-GI may accompany an impaired endoscopist to demonstrate professional camaraderie and facilitate ER evaluation. Second, with patient consent, a urine screen for commonly abused drugs and a blood alcohol level should be determined, because these agents account for approximately 30% of cases of acute-change-in-mental-status[4]. Moreover, detection of drug addiction by physicians is imperative to prevent patient harm[1,5].

Systematic literature review revealed that the reported cases are novel, even though some literature exists on impaired physicians, surgeons, anesthesiologists, and other specialists, especially from alcoholism or drug dependency[6-10].

Toxic encephalopathy can affect the cognitive behavior of any physician in any specialty or subspecialty performing medical, surgical, or other specialty consults; can affect the technical performance of procedures or surgery by physicians in any medical, surgical, or other specialty, such as cardiac catheterization, interventional angiography, or intestinal surgery, as illustrated for GI endoscopy. Moreover, toxic encephalopathy can affect other activities, such as driving a car or operating heavy machinery, due to cognitive impairment. Individuals suffering from toxic encephalopathy should refrain from these activities, and their supervisors should intervene appropriately if necessary.

This study has limitations. First, it is retrospective. However, the author, as Chief-of-GI, prospectively investigated and managed the work-up of the impaired endoscopists in real time, and thoroughly analyzed the events shortly thereafter for quality assurance. Second, the author cannot exclude missed cases of this syndrome during the study period, but such cases seem unlikely because this syndrome is so conspicuous. Third, recommendations on incident management are based on expert opinion by one GI, which may be subject to individual bias. However, Dr. Cappell has extensive experience in senior administrative positions in academic gastroenterology (see Methods), has published very extensively on GI endoscopy[11-13], and has published on GI quality assurance[14,15]. Fourth, this syndrome cannot be reliably characterized by just two cases, and the findings require corroboration, even though all reported syndromic features are biologically reasonable.


Two novel cases are reported of acute-change-in-mental-status manifesting as bizarre endoscopic interpretation and technique from toxic encephalopathy. Such incidents should be handled emergently to disengage impaired endoscopists from their patients undergoing endoscopy because of dangers of impaired endoscopists causing iatrogenic injury (e.g., GI perforation).


Manuscript source: Invited manuscript

Corresponding Author's Membership in Professional Societies: American Gastroenterology Association; American College of Gastroenterology.

Specialty type: Gastroenterology and hepatology

Country of origin: United States

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