Abstract
Audience
Emergency medicine residents, internal medicine residents, family medicine residents, community physicians, pediatricians, toxicology fellows
Introduction
There are over 600 compounds which contain anticholinergic properties.1 Medications with anticholinergic properties include antihistamines, atropine, tricyclic antidepressants, antipsychotics, topical mydriatics, antispasmodics, sleep aids, and cold preparations. 1–4 Plants that possess anticholinergic properties such as jimson weed, and street drugs cut with anticholinergics such as scopolamine are sources of accidental or intentional ingestion.1,2,4 Anticholinergic toxicity can cause a myriad of signs and symptoms, including agitation, seizures, hyperthermia, cardiac dysrhythmias, and death. Since poisoning from anticholinergic medications is frequently encountered in the emergency department, is it essential that emergency physicians be familiar with how to manage this toxidrome. This simulation case will allow the learner to evaluate and manage a patient presenting with anticholinergic toxicity.
Educational Objectives
By the end of this simulation case, learners will be able to: 1) describe the classic clinical presentation of anticholinergic toxicity, 2) discuss common medications and substances that may lead to anticholinergic toxicity, 3) recognize the electrocardiogram (ECG) findings in anticholinergic toxicity that require specific therapy, and 4) review the management of anticholinergic toxicity.
Educational Methods
This simulation is taught using a high- or moderate-fidelity manikin.
Research Methods
The educational content was evaluated by the learners immediately after completion and debriefing of the scenario. This case was initially piloted with approximately twenty emergency medicine residents. The group was comprised of first, second-, and third-year residents from a three-year emergency medicine residency. The efficacy of the content was assessed by oral feedback.
Results
Overall, the case was well received by learners, who felt it was useful and were engaged throughout the session. The overall feedback was positive and the case was well-received by learners.
Discussion
This scenario was eventually tested on over 100 learners over the course of several years, and the overall feedback was positive. It was found to be effective when debriefing sessions using various debriefing techniques (such as advocacy/inquiry) were utilized to discuss both the learners’ performance in the case, as well as the debriefing pearls (located at the end of this manuscript).
Topics
Anticholinergic toxicity, altered mental status, toxicology.
USER GUIDE
| List of Resources: | |
|---|---|
| Abstract | 25 |
| User Guide | 27 |
| Instructor Materials | 28 |
| Operator Materials | 37 |
| Debriefing and Evaluation Pearls | 40 |
| Simulation Assessment | 43 |
Learner Audience:
Interns, junior residents, senior residents, community physicians, pediatricians, toxicology fellows
Time Required for Implementation:
Instructor Preparation: 20–30 minutes
Time for case: 10–15 minutes
Time for debriefing: 15–30 minutes
Recommended Number of Learners per Instructor: 3–5
Topics:
Anticholinergic toxicity, altered mental status, toxicology.
Objectives:
By the end of this simulation case, learners will be able to:
Describe the classic clinical presentation of anticholinergic toxicity
Discuss common medications and substances that may lead to anticholinergic toxicity
Recognize the ECG findings in anticholinergic toxicity that require specific therapy
Review the management of anticholinergic toxicity
Linked objectives and methods
During this simulation, the participants will need to make the diagnosis of anticholinergic toxicity in a critically ill patient presenting with undifferentiated altered mental status (objective 1). If a thorough history and collateral information is obtained, the participants will realize that the patient overdosed on diphenhydramine and jimson weed (objective 2). During the case, the patient will be tachycardic with a widened QRS interval, requiring treatment with sodium bicarbonate (objective 3). In addition, the patient will require treatment with benzodiazepines, supportive care, and potential toxicology/poison center consultation (objective 4).
Recommended pre-reading for instructor
Fulton J, Nelson L. Anticholinergics. In: Adams J, ed. Emergency Medicine: Clinical Essentials. 2nd Edition. Philadelphia, PA: Elsevier; 2012:1240–1245.
Wax PM. Anticholinergic toxicity. In: Tintinalli JE, Stapczynski J, Ma O, Cline DM,, Meckler GD, eds. Tintinalli’s Emergency Medicine: A Comprehensive Study Guide. 8th ed. New York, NY: McGraw-Hill; 2016:1143–1146.
Results and tips for successful implementation
This simulation scenario is best implemented in an educational environment that includes high- or moderate-fidelity simulation resources along with monitors that will allow the learner(s) to independently interpret vital signs and visual stimuli (ie, a simulation center or equivalent educational space). This scenario was tested on more than 100 learners over the course of several years. Performance is best measured with a critical actions checklist that can be used during the real-time assessment of the simulation scenario by proctors with the primary purpose of participant evaluation.
The educational content was evaluated by the learners immediately after completion and debriefing of the scenario. This case was initially piloted with approximately twenty emergency medicine residents. The group was comprised of first, second-, and third-year residents from a three-year emergency medicine residency. The efficacy of the content was assessed by oral feedback. Overall, the case was well received by learners, who felt it was useful and were engaged throughout the session. The overall feedback was positive, and the case was well-received by learners.
Supplementary Information
INSTRUCTOR MATERIALS
Case Title: Anticholinergic Toxicity in the Emergency Department
Case Description & Diagnosis (short synopsis): An 18-year-old male is brought in by ambulance after being found altered and wandering around a mobile home park. Upon arrival to the emergency department, he is confused, combative, febrile, and tachycardic. Upon further questioning of his friend at bedside, it is discovered that the patient and his friends were drinking tea made out of jimson weed and liquid diphenhydramine, as part of a viral online social media challenge, prior to his altered level of consciousness. The patient is ultimately found to be presenting with an anticholinergic toxidrome secondary to consumption of jimson weed and diphenhydramine.
Equipment or Props Needed:
High- (or moderate-) fidelity simulation mannequin
Cardiac monitor, pulse oximeter
Blood pressure cuff
Intravenous (IV) catheter and lines
Crash cart with defibrillator
Bag valve mask
Intubation equipment (endotracheal tube, laryngoscope)
Syringes to simulate medications
Normal saline
Confederates needed:
Nurse to assist with management of patient
Paramedics who bring patient into emergency department (this can be played by simulation operator overhead)
Friend who arrives with patient and paramedics (this can be played by simulation operator overhead)
Stimulus Inventory:
| #1 | Electrocardiogram (ECG) showing sinus tachycardia with widened QRS interval (>100ms) |
| #2 | Chest Radiograph (CXR) |
| #3 | Complete blood count (CBC) |
| #4 | Comprehensive metabolic panel (CMP) |
| #5 | Urinalysis (UA) and Urine Drug Screen |
Background and brief information: The scenario takes place in an emergency department at a community hospital. The patient is an 18-year-old male brought in by paramedics with a chief complaint of altered mental status.
Initial presentation: The patient is confused and intermittently agitated upon arrival. His vital signs are significant for a fever and tachycardia. His physical exam is significant for dry and flushed skin, dilated pupils, and altered mental status. He is unable to provide further history.
How the scene unfolds: The patient arrives to the emergency department confused and unable to provide further history. If asked, the paramedics will report that the patient was found wandering about his mobile home park confused. They will report that the patient was tachycardic on scene, and that his finger-stick blood glucose was normal. They will state that the patient was intermittently combative en route, and would not cooperate with the non-rebreather face mask that they attempted to place on him. If the participants ask the patient’s friend at bedside for more information, he will state that the patient and some friends were taking part in a viral online social media challenge, and were drinking a tea made out of jimson weed and liquid diphenhydramine, which the patient consumed shortly before becoming altered.
On arrival, the patient is tachycardic and hyperthermic. His physical exam is significant for dry, flushed skin, dilated pupils, and altered mental status. The patient’s ECG will be significant for tachycardia with a QRS >100ms. The participants should make the diagnosis of anticholinergic toxicity. The participants may initiate treatment with activated charcoal. The participants should also contact the poison control center. They may control the patient’s agitation using benzodiazepines. If the diagnosis of anticholinergic toxidrome is delayed and benzodiazepines are not administered, the patient will become increasingly agitated and will have a seizure.
The participants should recognize the concerning finding of the QRS >100msec on ECG, and should administer sodium bicarbonate. If the participants do not recognize this, but consult the poison control center, the toxicologist will prompt them to review the ECG and initiate sodium bicarbonate. If sodium bicarbonate is not given, the patient will go into ventricular fibrillation. If the participants administer physostigmine, the patient will go into cardiac arrest. The patient should ultimately be admitted to the intensive care unit for further observation and management.
Critical actions:
Assess airway, breathing, and circulation (ABCs)
Place patient on cardiac monitors and pulse oximeter, and obtain initial set of vital signs
Establish two large bore IV lines
Administer IV fluids (at least 1 liter)
Make the diagnosis of anticholinergic toxicity
Contact the poison control center/obtain toxicologist consult
Give sodium bicarbonate for QRS >100msec on ECG
Give benzodiazepines to control agitation
Admit patient to the intensive care unit
Case Title: Anticholinergic Toxicity in the Emergency Department
Chief Complaint: The patient is an 18-year-old male presenting with a chief complaint of altered mental status
| Vitals: | Heart Rate (HR) 137 | Blood Pressure (BP) 167/95 | Respiratory Rate (RR) 22 |
| Temperature (T) 38.7°C | Oxygen Saturation (O2Sat) 98% on room air (RA) | ||
General Appearance: Appears stated age, in moderate distress
Primary Survey:
Airway: Patent
Breathing: Clear to auscultation bilaterally, slightly tachypneic
Circulation: 2+ femoral pulses bilaterally
History:
History of present illness: The patient is an 18-year-old male who presents brought in by paramedics with altered mental status. The patient will be too altered to provide any history. If asked, the paramedics will report that the patient was found wandering about a mobile home park altered. They will report that he was tachycardic in the field, and that his finger-stick blood glucose was normal. They will state that he was intermittently agitated en route. If the friend at bedside is questioned, he will state that the patient and his friends were drinking tea made out of jimson weed and liquid diphenhydramine earlier in the day.
Past medical history: Unable to obtain from patient due to altered mental status
Past surgical history: Unable to obtain from patient due to altered mental status
Patient’s medications: Unable to obtain from patient due to altered mental status
Allergies: Unable to obtain from patient due to altered mental status
Social history: Unable to obtain from patient due to altered mental status
Family history: Unable to obtain from patient due to altered mental status
Secondary Survey/Physical Examination:
General appearance: Awake, confused, dazed look on face, appears to be responding to internal stimuli
-
HEENT):
○ Head: No external signs of trauma
○ Eyes: Pupils dilated 8mm bilaterally, extra-ocular movements intact
○ Ears: within normal limits (WNL)
○ Nose: WNL
○ Throat: No tonsillar exudates, no erythema
Neck: No midline C-spine tenderness, full range of motion, no swelling, trachea midline
Heart: Tachycardic, no audible murmurs
Lungs: Clear to auscultation bilaterally, slightly tachypneic
Abdominal/gastrointestinal: Soft, non-distended, non-tender to palpation, no guarding, no rigidity. Slight fullness noted to suprapubic region. Decreased bowel sounds.
Genitourinary: Normal appearing external male genitalia
Rectal: Normal tone, no melena, no gross blood
Extremities: No gross deformities. No lower extremity edema.
Back: No thoracic or lumbar spine tenderness, no step-offs
Neuro: Awake. Not answering questions appropriately. No facial droop. Intermittently following commands. Intermittently agitated. Appears to be responding to internal stimuli, reaching for things in the air. Moves all four extremities, no significant weakness noted on allowable exam.
Skin: Dry, flushed skin, warm to touch, no diaphoresis
Lymph: WNL
Psych: Intermittently agitated, appears to be responding to internal stimuli
Results:
Electrocardiogram (ECG) – sinus tachycardia with widened QRS interval
Image source: (author’s own image)
Chest Radiograph (CXR)
Image source: Author’s own image
| Complete blood count (CBC) | |
| White blood count (WBC) | 15.0 ×1000/mm3 |
| Hemoglobin (Hgb) | 14.0 g/dL |
| Hematocrit (HCT) | 40.0% |
| Platelet (Plt) | 250 ×1000/mm3 |
| Comprehensive metabolic panel (BMP) | |
| Sodium | 140 mEq/L |
| Chloride | 100 mEq/L |
| Potassium | 4.7 mEq/L |
| Bicarbonate (HCO3) | 19 mEq/L |
| Anion Gab | 21 mEq/L |
| Blood Urea Nitrogen (BUN) | 30 mg/dL |
| Creatine (Cr) | 1.1 mg/dL |
| Glucose | 100 mg/dL |
| Calcium | 9.5 mg/dL |
| Total Protein | 7.0 g/dL |
| Albumin | 40 units/L |
| Alkaline Phoshatase | 100 units/L |
| Aspartate aminotransferase (AST) | 90 units/L |
| Alanine aminotransferase (ALT) | 60 units/L |
| Urinalysis (UA) | |
| Color | yellow |
| Appearance | clear |
| Specific gravity | 1.010 |
| pH | 7.0 |
| Glucose | negative |
| Ketones | negative |
| Hemoglobin | negative |
| Leukocyte esterase | negative |
| Nitrites | negative |
| White blood cells (WBC) | 0 WBCs/high powered field (HPF) |
| Red blood cells (RBC) | 0 RBCs/HPF |
| Squamous epithelial cells | 1 cells/HPF |
| Bacteria | negative |
| Urine Toxicology Screen: | |
| Tetrahydrocannabinol (THC) | None Detected |
| Phencyclidine (PCP) | None Detected |
| Benzodiazepines | None Detected |
| Barbiturates | None Detected |
| Methadone | None Detected |
| Cocaine | None Detected |
| Amphetamines | None Detected |
| MDMA | None Detected |
OPERATOR MATERIALS
SIMULATION EVENTS TABLE:
| Minute (state) | Participant action/ trigger | Patient status (simulator response) & operator prompts | Monitor display (vital signs) |
|---|---|---|---|
| 0:00 (Baseline) | Assess ABCs Attach patient to cardiac monitor and pulse ox Obtain initial set of vitals |
Patient arrives confused and intermittently agitated. | T 38.7°C HR 137 BP 167/95 RR 22 O2 98% on RA |
| 02:00 | Obtain history from paramedics Obtain history from patient’s friend Perform physical exam Obtain finger-stick glucose |
If asked, paramedics will state that patient was found wandering around mobile home park confused. If asked, patient’s friend will state that patient was making tea with jimson weed and liquid diphenhydramine, which he consumed prior to becoming altered. Physical exam will be significant for dry, warm, flushed skin, mydriasis, tachycardia, and confusion. Finger-stick glucose will be normal. |
T 38.7°C HR 137 BP 167/95 RR 22 O2 98% on RA |
| 04:00 | Make diagnosis of anticholinergic toxicity Obtain IV access Order labs Order ECG |
Patient’s agitation may be treated with benzodiazepines. If benzodiazepine administered: Patient’s agitation and tachycardia will improve. If diagnosis of anticholinergic toxicity not made by this time and patient not given benzodiazepine, patient will become increasingly agitated and have a seizure. If patient has seizure, it will resolve with benzodiazepine administration. If benzodiazepine is given, vitals will stabilize, and move on to time 6:00. If benzodiazepine is not given, patient will go into cardiac arrest and expire. |
If benzo given: HR 115 BP 140/70 RR 18 O2 98% on RA If benzo not given, seizure: HR 150 BP 170/90 RR 28 O2 88% on RA If benzo given, seizure resolves: HR 120 BP 140/90 RR 18 O2 98% on RA |
| 06:00 | Poison control/ toxicology consult should be obtained Lab results will return |
ECG is available demonstrating sinus tachycardia with a QRS >100msec. Participants should recognize wide QRS complex and initiate treatment with sodium bicarbonate. If poison control/toxicology consult obtained, they will prompt participants to review ECG and give sodium bicarbonate. They will also recommend that activated charcoal be given. They will recommend against physostigmine, because patient’s QRS is >100ms. If sodium bicarb is given: Patient’s vital signs will remain stable, proceed to time 10:00 If sodium bicarb not given: Patient will go into Ventricular fibrillation. If ACLS started, patient will not obtain return of spontaneous circulation (ROSC) until sodium bicarb is given. If sodium bicarb given, patient will obtain ROSC, proceed to time 10:00. If sodium bicarb still not administered, patient will expire and case will end. If physostigmine is given, patient will decompensate into cardiac arrest and case will end. |
If sodium bicarb given: HR 110 BP 130/60 RR 18 O2 98% on RA If sodium bicarb not given: HR v Fib BP 0 RR 0 O2 undetectable |
| 10:00 | Admit the patient to the ICU | If fluids, benzodiazepines, and sodium bicarb given, patient’s agitation and vital signs will improve, and patient should be admitted to the ICU. If no treatment was started, and/or if the diagnosis of anticholinergic toxicity was not made, the patient will have further seizures requiring intubation, and will ultimately go into cardiac arrest and expire. |
HR 90 BP 140/160 RR 18 O2 98% on RA |
Diagnosis:
Anticholinergic toxicity secondary to jimson weed ingestion
Disposition:
Intensive care unit
DEBRIEFING AND EVALUATION PEARLS
Anticholinergic Toxicity
-
Introduction:
○ There are over 600 compounds which contain anticholinergic properties.1 Medications with anticholinergic properties include antihistamines, atropine, tricyclic antidepressants, antipsychotics, topical mydriatics, antispasmodics, sleep aids, and cold preparations.1,2,3,4 Plants such as jimson weed (datura stramonium) and deadly nightshade (atropa belladonna) also have anticholinergic properties and are a common source of accidental or intentional ingestion.1,2,4 Street drugs such as heroin and cocaine have been known to be cut with anticholinergics such as scopolamine. 1,2 Thus, it is not surprising that anticholinergic poisonings are frequently seen in the emergency department, and recognition of the anticholinergic toxidrome is a necessary clinical skill.1,4
-
Pathophysiology and Clinical Manifestation:
○ Muscarinic acetylcholine receptors are located in the central nervous system, heart, smooth muscle, secretory glands, and ciliary body of the eye.1
○ Normally, the neurotransmitter acetylcholine binds to these muscarinic receptors1
○ Anticholinergic drugs competitively inhibit this binding, producing the following clinical effects:
| “Mad as a hatter” | Blockage of CNS muscarinic receptors |
|
| “Blind as a bat” | Pupillary dilation and ineffective accommodation |
|
| “Dry as a bone” | Blockage of sweat gland muscarinic receptors → lack of sweating |
|
| “Hot as a hare” | Lack of sweating → anhidrotic hyperthermia |
|
| “Red as a beet” | Loss of sweat production → Body attempts to compensate by cutaneous vasodilation to dissipate heat |
|
| “Full as a flask” | Detrusor muscle of bladder and urethral sphincter under muscarinic control |
|
| Tachycardia |
|
-
Management:
○ Stabilization of airway, breathing, and circulation is paramount, as well as initiating IV access and placing patient on cardiac monitoring and pulse oximetry. 1
-
○ Decontamination:
▪ Activated charcoal may be considered as long as patient is able to protect their airway or if they are intubated, though patients shouldn’t be intubated solely for the purpose of administering activated charcoal. 1,2,4
▪ May be considered even if ingestion occurred more than one hour prior, because anticholinergics decrease gastrointestinal motility. 2,4
-
○ Benzodiazepines:
-
○ Sodium bicarbonate:
-
○ Physostigmine:
▪ Physostigmine is an acetylcholinesterase inhibitor → increases amount of acetylcholine accumulating in synapse → overcomes effects of anticholinergic agents. 1,4
-
▪ May be indicated when patients have significant central anticholinergic toxicity. 1
Beneficial in treatment of agitation or delirium. 4
-
▪ Use is controversial:
▪ Should not be given if a condition other than pure anticholinergic poisoning is suspected (eg, tricyclic antidepressant overdose), or if QRS interval is at or above 100 msec. 1,4
▪ If considering using physostigmine, consult a toxicologist.
-
Disposition:
○ Asymptomatic patients → Should receive activated charcoal, and be observed for at least six hours in the emergency department and may be discharged if they continue to be asymptomatic. 1
○ Mild anticholinergic toxicity → Should receive activated charcoal, be treated with benzodiazepines if required, and observed for six hours for resolution of symptoms. Discharge can be considered if symptoms resolve; otherwise, they should be admitted for observation. 1
○ Severe anticholinergic toxicity, and those treated with physostigmine → Should be admitted to an intensive care unit.1
SIMULATION ASSESSMENT
Anticholinergic Toxicity in the Emergency Department
Learner: _________________________________________
Assessment Timeline
This timeline is to help observers assess their learners. It allows observer to make notes on when learners performed various tasks, which can help guide debriefing discussion.
Critical Actions:
|
0:00 |
Critical Actions:
□ Assess airway, breathing, and circulation (ABCs)
□ Place patient on cardiac monitors and pulse oximeter, and obtain initial set of vital signs
□ Establish two large bore IV lines
□ Administer IV fluids (at least 1 liter)
□ Make the diagnosis of anticholinergic toxicity
□ Contact the poison control center/obtain toxicologist consult
□ Give sodium bicarbonate for QRS >100msec on ECG
□ Give benzodiazepines to control agitation
□ Admit patient to the intensive care unit
Summative and formative comments:
Milestones assessment:
| Milestone | Did not achieve level 1 | Level 1 | Level 2 | Level 3 | |
|---|---|---|---|---|---|
| 1 | Emergency Stabilization (PC1) | Did not achieve Level 1 | Recognizes abnormal vital signs | Recognizes an unstable patient, requiring intervention Performs primary assessment Discerns data to formulate a diagnostic impression/plan |
Manages and prioritizes critical actions in a critically ill patient Reassesses after implementing a stabilizing intervention |
| 2 | Performance of focused history and physical (PC2) | Did not achieve Level 1 | Performs a reliable, comprehensive history and physical exam | Performs and communicates a focused history and physical exam based on chief complaint and urgent issues | Prioritizes essential components of history and physical exam given dynamic circumstances |
| 3 | Diagnostic studies (PC3) | Did not achieve Level 1 | Determines the necessity of diagnostic studies | Orders appropriate diagnostic studies. Performs appropriate bedside diagnostic studies/procedures |
Prioritizes essential testing Interprets results of diagnostic studies Reviews risks, benefits, contraindications, and alternatives to a diagnostic study or procedure |
| 4 | Diagnosis (PC4) | Did not achieve Level 1 | Considers a list of potential diagnoses | Considers an appropriate list of potential diagnosis May or may not make correct diagnosis |
Makes the appropriate diagnosis Considers other potential diagnoses, avoiding premature closure |
| 5 | Pharmacotherapy (PC5) | Did not achieve Level 1 | Asks patient for drug allergies | Selects an medication for therapeutic intervention, consider potential adverse effects | Selects the most appropriate medication and understands mechanism of action, effect, and potential side effects Considers and recognizes drug-drug interactions |
| 6 | Observation and reassessment (PC6) | Did not achieve Level 1 Reevaluates patient at least one time during case |
Reevaluates patient after most therapeutic interventions | Consistently evaluates the effectiveness of therapies at appropriate intervals | |
| 7 | Disposition (PC7) | Did not achieve Level 1 | Appropriately selects whether to admit or discharge the patient | Appropriately selects whether to admit or discharge Involves the expertise of some of the appropriate specialists |
Educates the patient appropriately about their disposition Assigns patient to an appropriate level of care (ICU/Tele/Floor) Involves expertise of all appropriate specialists |
| 9 | General Approach to Procedures (PC9) | Did not achieve Level 1 | Identifies pertinent anatomy and physiology for a procedure Uses appropriate Universal Precautions |
Obtains informed consent Knows indications, contraindications, anatomic landmarks, equipment, anesthetic and procedural technique, and potential complications for common ED procedures |
Determines a back-up strategy if initial attempts are unsuccessful Correctly interprets results of diagnostic procedure |
| 20 | Professional Values (PROF1) | Did not achieve Level 1 | Demonstrates caring, honest behavior | Exhibits compassion, respect, sensitivity and responsiveness | Develops alternative care plans when patients’ personal beliefs and decisions preclude standard care |
| 22 | Patient centered communication (ICS1) | Did not achieve level 1 | Establishes rapport and demonstrates empathy to patient (and family) Listens effectively | Elicits patient’s reason for seeking health care | Manages patient expectations in a manner that minimizes potential for stress, conflict, and misunderstanding. Effectively communicates with vulnerable populations, (at risk patients and families) |
| 23 | Team management (ICS2) | Did not achieve level 1 | Recognizes other members of the patient care team during case (nurse, techs) | Communicates pertinent information to other healthcare colleagues | Communicates a clear, succinct, and appropriate handoff with specialists and other colleagues Communicates effectively with ancillary staff |
References/suggestions for further reading
- 1.Su M, Goldman M. Anticholinergic poisoning. In: Grayzel J, editor. UpToDate. Waltham, MA: UpToDate Inc; [Accessed August 4, 2019]. Updated March 29, 2019. Available at: https://www.uptodate.com/contents/anticholinergicpoisoning. [Google Scholar]
- 2.Broderick ED, Metheny H, Crosby B. StatPearls [Internet] Treasure Island (FL): StatPearls Publishing; 2022. Jan, Anticholinergic Toxicity [Updated 2022 Jun 21] Available from: https://www.ncbi.nlm.nih.gov/books/NBK534798/ [PubMed] [Google Scholar]
- 3.Huynh DA, Abbas M, Dabaja A. StatPearls [Internet] Treasure Island (FL): StatPearls Publishing; 2022. Jan, Diphenhydramine Toxicity. [Updated 2022 May 8] Available from: https://www.ncbi.nlm.nih.gov/books/NBK557578/ [PubMed] [Google Scholar]
- 4.Fulton J, Nelson L. Anticholinergics. In: Adams J, editor. Emergency Medicine: Clinical Essentials. 2nd Edition. Philadelphia, PA: Elsevier; 2012. pp. 1240–1245. [Google Scholar]
- 5.Wax PM. Anticholinergic toxicity. In: Tintinalli JE, Stapczynski J, Ma O, Cline DM, Meckler GD, editors. Tintinalli’s Emergency Medicine: A Comprehensive Study Guide. 8th ed. New York, NY: McGraw-Hill; 2016. pp. 1143–1146. [Google Scholar]
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