escaping from emergency department pitfalls
TRANSCRIPT
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Montinee Sangtian, MDEmergency PhysicianBUMRUNGRAD INTERNATIONAL HOSPITAL
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INTRODUCTION
high-risk specialty
not purely due to a lack of knowledge but rather to simply “letting one’s guard down.”
Did not use the evidence-based in clinical decision.
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COMMON PRESENTING SYMPTOMS IN ED
Abdominal Pain
Chest Pain
Dyspnea, Shortness of Breath
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CHEST PAIN
5% of all ED visits
Ranging from benigh to life-threatening.
ACS is 20% of all deaths in US.
Fear of being sued : increased hospital cost and admit non-cardiac caused in IPD or CCU
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IMMEDIATE LIFE THREATENING CAUSED OF CHEST PAIN
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FINAL DIAGNOSIS OF CHEST PAIN FROM ED
i*trACS registry data, Jun1, 1999- Aug1, 2001
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BUT, MORE OVER…
Missed Cardiac Ischemia 2-4%, with mortality rate 10-25%
It means : every 100 chest pain patients
- 4/100 : Missed Cardiac Ischemia
- 1/100 : dead from missed diagnosis.
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Characteristics associated with inadvertent discharge of a patient with missed cardiac ischemia
• Younger patient
• Atypical symptoms
• Women
• Nonwhite
• Physician inexperiences
• Lower-volume EDs
• Failure to detect ischemia on initial ECG
• Failure to obtain an ECG
(Ann. Emerg Med 1989;18(10):1029-34)
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CLINICAL QUESTIONS
How to rule out or rule in life-threatening chest pain?
Characteristics of pain, History, Risk factors, Physical exam, ECG, Lab, CXR
Outcome.
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CHARACTERISTICS OF CHEST PAIN
NRMI2 – 1/3 of MI – no chest pain
20% of MI – with presenting symptoms other than chest pain
Risk Factors % Without chest pain
Prior Heart Failure 51
Prior Stroke 47
Age > 75 yr 45
DM 38
Non-White 34
Woman 39
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ATYPICAL CHEST PAIN
7% of ACS : chest wall tenderness
6% of costochondritis dx : enz - proven MI ( Arch. Intern Med 1994; 154(21):2466-9)
To define low-risk group : use combination of 3
1. sharping or stabbing pain
2. no history of angina
3. pain reproduced by palpation
Without these combination – 5% were MI.( Arch. Intern Med 1985; 145(1):65-9)
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HISTORY
Burning, Indigestion complaints – as strong as chest pressure (QJM 2003;96(12);893-9)
Precipatating factors : physical activities 35%, eating 8.2%, emotional stress 6.8% (Int. J. Cardiol.; 117(2):260-9)
Relieving factor : GI cocktail, antacids, NTG –not reliable. (Ann. Emerg Med 1996;26(6):687-90)
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Features that increased the probability of an acute MI
Jama 1998;280:1256
• CLINICAL FEATURES Likelihood ratio (95% CI)
• Pain in chest or left arm 2.7
• Chest pain radiation : Rt shoulder 2.9(1.4-6.0)
• Chest pain radiation : Lt arm 2.3(1.7-3.1)
• Chest pain radiation : Both Lt and Rt arm 7.1(3.6-14.2)
• Nausea or vomiting 1.9(1.7-2.3)
• Diaphoreis 2.0(1.9-2.2)
• 3rd Heart sound on ausculation 3.2(1.6-6.5)
• Hypotension (SBP < 80 mmHg) 3.1(1.8-5.2)
• Pulmonary crackles 2.1(1.4-3.1)Features that decreased the probability of an acute MI
• Pleuritic Chest Pain 0.2(0.2-0.3)
• Sharp or Stabbing Chest Pain 0.3(0.2-0.5)
• Positioning Chest Pain 0.3(0.2-0.4)
• Chest Pain reproduced by palpation 0.2
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Classic or traditional Risk Factors
• Advanced age
• Male
• Hypertension
• DM
• Hypercholesterolemia
• Premature CAD in 1st degree relatives
• Cigarette smoking
Non-traditional
Risk Factors
• HIV
• SLE
• ESRD
• Cocaine
• Type A Personality
• Genetic and Acquired thrombophilias
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4 RISK FACTOR : DM, HT, HYPERCHOL, FAMILY HX OF CAD
Group No Risk Factors
LR –
≥ 4 Risk Factors
LR +
Age < 40 yr 0.17(95% CI 0.04-0.66)
7.39(95% CI 3.09-17.67)
40 – 65 yr 0.53(95% CI 0.40-0.71)
2.13(95% CI 1.66-2.73)
65 yr 0.96(95% CI 0.74-1.09)
1.09(95% CI 0.64-1.62)
i*trACS registry data analysis
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RISK STRATIFICATION : TIMI, GRACE, ETC.
Don’t be confuse !
TIMI, GRACE, ESSENCE – for predicting outcome, adverse events.
Not for rule out Acute Coronary Syndrome.
Can not use for discharge decision making.
Even TIMI score = 0, rate of adverse events
in 30 days = 1.7% (95% CI 1-4%)
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ECG AND CARDIAC BIOMARKERS
Single initial normal EKG and Cardiac Enz can not be used for rule out ACS.
7.8% of MI : normal initial ECG
35.3% of MI : non-specific finding on initial ECG
Be careful in LBBB and Ventricular Pacing Rhythm (VPR) ECG.
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LBBB
• Widened QRS complex > 0.12s• Monophasic notch R-wave in the lateral leads Lead I, V5 • Absent of Q-wave in Lateral leads.• There is discordant between the major vector of QRS complex and the major vector of ST-segment/ T-wave complex that follows
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ACUTE MI IN THE PRESENCE OF LBBB
•There is concordant ST-segment elevation in lead I, aVL, V5, V6•Concordant ST-segment depression in leads V1-V3
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Scarbossa’s criteria for STEMI in the presence of LBBB
ST-segment elevation ≥ 1 mm concordant with QRS complex
Score 5
ST-segment elevation ≥ 1 mm in lead V1, V2 or V3
Score 3
ST-segment elevation ≥ 5 mm discordant to QRS complex
Score 2
Score ≥ 3 : likely to experience STEMIScore < 3 : indetermined
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VPR
•Small amplitude spikes before the widened QRS cpx•Predominate negative QRS cpx (9/12), less opportunity for Concordant ST-segment elevation
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ACUTE MI IN THE PRESENCE OF VPR
Concordant ST-segment elevation in leads II, III, aVF and Reciprocal ST-segment depression in leads I and aVL
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Only 1 useful to detect STEMI in VPR :
ST-segment elevation ≥ 5 mm discordant to QRS complex.
The ECG in VPR is more likely to rule in the diagnosis of acute MI than to rule it out.
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PRIOR NEGATIVE CARDIAC WORKUP :
Stress test (Am J Cardiol 1997; 80(8): 1086-7)
• 3 yr Event rate for prior negative stress test is 5-15%.
• A Stress test can be considered to rule out coronary disease during that visit only.
Cardiac Cath. (Arch Intern Med 2006; 166(13): 1391-5)
• 1 yr Event rates for prior negative C.Cath
• 3.3% : mild CAD (< 50% stenosis)
• 1.2% : serious event rate.
• Normal angiogram equals to no short-term risk of ACS
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OTHERS CAUSES OF ACUTE LIFE-THREATENING CHEST PAIN
Aortic Dissection
Pulmonary embolism
Pericarditis with cardiac tamponade
Tension pneumothorax
Esophageal ruptured.
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AORTIC DISSECTION OF THORACIC AORTA
Chest pain (sensitivity 67%), Back Pain (32%), Abd. Pain (23%), ANY PAIN (90%)
Other symptoms : syncope (4-13%), stroke (6%), other neuro deficit (17%)
In AD patients : 62% Widening mediastinum , 50% Abn. Aortic contour, 12% normal CXR
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PERICARDITIS
Failure to differentiate Pericarditis from other chest syndrome
Classic symptoms : progressive, central, pleuriticshest pain that worse in supine
PE : friction rub, heard best in sitting up and leaning forward.
ECG : diffuse ST elevation , PR depression
( except lead aVR)
35-50% of Patients : elevated Troponin level
Always look for Signs of Pericardial tamponade!
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a. Acute Pericarditis : Concave ST segment Elevationb. Acute MI : Convex ST segment Elevation
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Ratio of the ST segment and T wave amplitudes, Lead V6a. ratio ≥ 0.25 : Pericarditisb. ratio < 0.25 : BER (Benign Early Repolarized)
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BOERHAAVE’S SYNDROME
Classic Triad: forceful emesis, chest pain, subcutaneous emphysema.
CXR abnormalities usual on the Left : 90% tear in the left posterolateral wall of lower 1/3 esophagus
pneumomediastinum, hydropneumothorax
20% of case : no vomiting
Other caused : swallowing sandwich, violent cough, weight lifing, seizures, blunt abdomen.
Diagnosis : CXR, CT, Esophagogram
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SUMMARY : PITFALLS IN CHEST PAIN
Over-reliance on the classic presence of chest pain for the diagnosis of acute myocardial infarction (MI)
Exclusion of cardiac ischemia based on reproducible chest wall tenderness
Assumption that acute MI cannot be diagnosed with a 12-lead ECG in the presence of pre-existing left bundle branch block or ventricular paced rhythm
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STEMI can be diagnosed on an ECG with LBBB … the ECG is more useful in ruling in the diagnosis than in excluding it.
Use of a “GI cocktail” to distinguish between cardiac versus non-cardiac chest pain
Assumption that a normal ECG rules out cardiac ischemia
Single determinations of cardiac markers at the time of presentation appear to be inadequate to exclude the diagnosis of acute MI and provide no information about the possibility of cardiac ischemia
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Over-reliance on a “classic” presentation.
Use of the chest X-ray to exclude AD
The use of ECG findings to rule in or rule out PE
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Failure to differentiate pericarditis from other chest syndromes
Assumption that the standard chest X-ray completely rules out pneumothorax
Excluding the diagnosis of Boerhaave’s syndrome due to an absence of antecedent retching or vomiting
Failure to evaluate a patient with chest tenderness for herpes zoster
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Frequent chief complaint in ED
Common associated with hospital admission
Subjective symptom
Crucial for EPs to consider related underlying disease.
Delayed diagnosis and treatment can lead to increase morbidity and mortality.
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Pericardial Effusion and Cardiac Tamponade
Pneumothorax
Pulmonary Embolism
Asthma, COPD
Anemia, etc.
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Ausculation in Hemothorax, Pneumothorax : sensitivity 50-82%, PPV 97-98%
Normal ausculatory exam : up to 800 cc of hemothorax, 28% of pneumothorax
Pneumonia : sensitivity 47-69%, specificity 58-75%
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Pulse oximetry : useful for detect hypoxia,
Not for hypercarbia, hypoventilation
Anxiety and depressive are common in elderly and more likely with non-specific symptoms.
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< 50% of Pt with cardiac tamponade have the classic finding.
Doppler Echocardiography : sensitivity 96%
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Classic symptoms: pleuritic chest pain and SOB
20% asymptomatic or minor symptoms
23% missed pneumothorax in standard CXR in ICU patients. 26% missed in severe injured patients
CXR Upright 80% sensitivity, Supine 50% Sens.
Others options : expiratory CXR, lateral decubitusfilm, US, Chest CT
Bedside US : up to 98% sensitivities
CXR and US cannot diff. Bullous and Pneumothorax
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Not including pulmonary embolism in the differential diagnosis of the patient with dyspnea
Use objective criteria to assess pretest probrobility.
Over-reliance on the D-dimer, ABG, CXR, or EKG to exclude PE
CXR, EKG should not be used alone to exclude PE.
A D-dimer test should not be used to exclude PE in patients with moderate or high clinic pre-test probability.
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Only 20% present with classic triad of chest pain, dyspnea, hemoptysis
In PE patients only 44% has pleuric chest pain
80-92% of PE patients presented with dyspnea.
67% of Pt : rapid onset of dyspnea over sec to min.
Classic S1Q3T3 ECG only 12-50% of PE.
Precordial T-wave inversion was the most common finding in ECG of PE (68%)
Sinus tachycardia : 8-69% of PE
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Low risk Wells score + Negative D-Dimer : NPV 96-100% (Ann Intern Med 2001;135(2):98-107)
PERC : can exclude PE in low pretest prob.(Am J Emerg Med 2008;26(2):181-5)
D-Dimer
normal D-Dimer level (ELISA): 95% likelihood of not having PE
Poor PPV, Good NPV (Mayo Clin Proc 2003;78(11):1385-91)
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CXR : poor diagnostic tool for PE (Chest 1991;100(3):598-03)
ECG : neither sensitive nor specific for PE
(Emerg Med Clinic North Am 2006;24(1):133-43)
CXR, EKG should not be used alone to exclude PE
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Bedside US : sensitivity 51-93%, specificity 82-90% ( Int J Cardiol 1998;65(1):101-9)
V/Q Scan :
normal, low, intermediate, high probability of PE
High Probability : PPV 85-90%
Normal and High Prob : powerful prognostic tool.
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CONTRAST-ENHANCED HELICAL, SPIRAL, OR
ELECTRON-BEAM CT
Pulmonary Computed Tomography Angiography (PTCA) : Senstivity 53-70%
PTCA + Scoring System: 83-96%(N Engl J Med 2006;354(22):2317-27)
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Gold standard : Pulmonary angiography
Disadvantage : Invasive
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Identifying asthmatics at risk
Assessing asthma severity
Clinical presentation : slow or fast onset
Some Pt. have low perception of dyspnea
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Overly or underly aggressive oxygen administration in patients with COPD
Do not withhold oxygen from a hypoxic COPD patient; however, be cautious with its use and follow PCO2 levels.
Initial Goal : SaO2 > 90%, PaO2 60-70 mmHg
Cutoff at Sao2 92%, detect hypoxia : sensitivity 100%, specificity 86%
Not considering non-invasive positive pressure ventilation; that is, CPAP/BiPAP as an alternative to intubation in selected patients
Data support for using NPPV is strongest for COPD.
Decreased Intubation Rate (RR 0.42, 95%CI 0.31-0.59)
Decreased Mortality (RR 0.41, 95%CI 0.26-0.64)
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5-10% of all ED visits.
18-25% admitted for investigation
10% : operation
Challenge for emergency physician (EP):
About 1/3 have an atypical presentation.
If misdiagnosis, mortality rate 2.5 times higher than
correct diagnosis in the elderly.
Problematic : Women (child-bearing age), HIV, Elderly.
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A 65 yr Male, DM,HT with epigastric pain, nausea, no fever
A 43 yr Female, Lower abdominal pain, vaginal bleeding
A 25 yr Male: fever with RLQ pain
A 78 yr Male, ESRD on HD : abdominal pain
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Who is the patient of acute abdomen?
What are the probable diagnoses you have in
mind?
Why do you consider such diagnosis?
How do you prove it?
When will you consult surgeon for operation?
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Common, lifetime risk 7%
Only 20% of elderly pt have classic findings.
MANTRELS (Alvarado) Score : less suited for elderly, women
Missed Appendicitis in score < 5 : age 60-80 yr
High score in women has a lower PPV
Score > 7 in women : 1/3 were normal appendix
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No lab test specific for appendicitis.
Scoring system : MANTRELS, Ohmann score : none of these are accurate enough to predict appendicitis.
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CT : sensitivity 94%, specificity 94%
CT : appendix > 6 mm, wall thickening, RLQ inflammatory changes, appendicoliths.
Contrast CT vs NonContrast CT : equal
IV contrast : highlight inflammed tissue.
Oral Contrast : better differentiate the appendix from surrounding tissue.
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High sensitivity as CT in some studies Lower NPV than CT (specificity 83%) Finding : non-compressible lumen, diameter >
6mm, absence gas in lumen and appendicoliths(some center use 7mm)
Doppler US – increased flow in an inflammedappendix, but limit in necrotic or ruptured appendix.
Limitations : Obese, Bowel gas, Operator dependent
US best use as an initial study in children, women, pregnant patients.
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A 43y Female, Lower abdominal Pain, no fever, no nausea/vomiting
Vaginal bleeding : spotting for 20 days
Refused probability of pregnancy
No contraception
• UPT +
• PV : OS closed, minimal bloody mucoid• Treated as Threatened abortion, D/C
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3 DAYS LATER
The patient came to ED, with abdominal pain with spotting.
V/S : BP 100/80, PR 110
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1:30000 pregnancies
4 common signs
abdominal pain, adnexal mass, peritoneal irritation, enlarged uterus (absent in 1st Tri.)
Consider heterotropic pregnancies in women receiving ART : 1:100 Pregnancies
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8% of Unstable angina presented with epigastric pain
Painless ulcer was found 35% of Pt > 60 yr
Elderly Pt with Acute cholecystitis
50% has afebrile. 33% absent leukocytosis and normal LFT
Pancreatitis
incident 200 folds in > 65y
Higher risk of necrotizing pancreatitis in >80y
Early CT in Elderly
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Low incidence (1/1000 Hospital admission)
High Mortality (80%), with immediate angiogram (mortality reduced to 54%)
Severe Abdominal Pain (out of proportion to exam)
Risk Factors for mesenteric ischemia
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Type of Mesenteric Ischemia
Risk Factors Special Notes
SMA Embolus Cardiac Disease•AF and other arrhythmias•Valvular diasease•Ventricular aneurysm•Cardiomyopathy
1/3 have Hx of Embolic event
SMA Thrombosis Vascular Disease Risks•HT•Hypercholesterolemia•DM•Smoking
Acute event may be preceded by period of “intestinal angina” and prolonged period of significant weight loss
Mesenteric Venous Thrombosis
Hypercoagulable State•Inherited•Acquired (Malignancy, Oral contrceptions)
Women > Men½ have personal or family Hx of DVT/PESubacute presentation
NOMI(Non-Occlusive MesentericIschemia)
Low-flow state•Sepsis Heart Failure•Volume depletion Hemodialysis
Drugs•Digitalis Ergot derivatives•Cocaine Norepinephrine
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Misdiagnosis of cardiac ischemia
Over-reliance on “classic” presentations and laboratory results of appendicitis
Over-reliance on laboratory values and ancillary testing in suspected mesenteric ischemia.
Failure to consider heterotopic pregnancy in women receiving reproductive assistance
Failure to appreciate atypical signs and symptoms in the elderly
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Do Not over-reliance on the classic signs, symptoms, diagnostic tools.
Know Limitations of Test and Scoring system
Negative test does not mean no disease.
Use Evidence-Based in decision making
Do not “ Guard Down”