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Emergency Medicine

Syncope Admission Criteria

Admit syncope patients when a serious condition is identified or suspected after focused evaluation. Use ECG, hemodynamics, cardiac history, troponin, and clinical impression to distinguish patients needing inpatient treatment from those appropriate for discharge or structured observation.

Clinical question: Which adults presenting with syncope require hospital admission, observation, or discharge after emergency department evaluation?

Disposition

Admit when syncope is linked to a serious condition

Disposition follows cause and short-term risk, not the symptom alone.

Perform a focused initial assessment that establishes whether syncope is attributable to a serious condition requiring inpatient treatment. Hospital evaluation and treatment are recommended when such a condition is identified or is potentially relevant to the event. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and Management ...

Admission is favored for suspected cardiac syncope because cardiac syncope carries substantially greater mortality than noncardiac syncope; reported 1-year mortality is 18% to 33% with cardiac syncope versus 3% to 4% without a cardiac cause. PubMedPREDICTING ADVERSE OUTCOMES IN SYNCOPE - PMC Cardiac etiologies requiring expedited evaluation include arrhythmia, conduction disease, cardiomyopathy, valvular heart disease, ischemia, and acute thromboembolic disease. PubMedCardiac findings and observation duration in patients with syncope in the emergency department: a cohort studyPubMedRisk stratification of adult emergency department syncope patients to predict short-term serious outcomes after discharge (RiSEDS) study

Do not admit solely because the cause remains unexplained if the history supports reflex or orthostatic syncope, ECG and hemodynamics are reassuring, and no serious condition is suspected. A substantial proportion of ED syncope evaluations remain etiologically unresolved, but low-risk patients with a readily identified noncardiac mechanism generally do not benefit from hospitalization. ScienceDirectSyncope risk stratification in the ED - ScienceDirectPubMedRisk stratification of adult emergency department syncope patients to predict short-term serious outcomes after discharge (RiSEDS) study

Disposition framework after focused ED evaluation. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and Management ...ScienceDirectSyncope risk stratification in the ED - ScienceDirectPubMedCardiac findings and observation duration in patients with syncope in the emergency department: a cohort studyPubMedPREDICTING ADVERSE OUTCOMES IN SYNCOPE - PMC
DispositionFindings that support this choiceImmediate next action
Inpatient admissionSerious condition identified or suspected; acute coronary syndrome symptoms; conduction disease; worrisome cardiac history; clinical valvular disease; ischemic ECG changes, arrhythmia, prolonged QT interval, or bundle-branch block. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and Management ...PubMedRisk stratification of adult emergency department syncope patients to predict short-term serious outcomes after discharge (RiSEDS) studyPubMedPREDICTING ADVERSE OUTCOMES IN SYNCOPE - PMCTreat the identified disorder and use monitored evaluation for clinically important arrhythmia or structural cardiac disease. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and Management ...PubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient Admission
Monitored ED observationIntermediate risk without an immediate diagnosis or a clear indication for full inpatient admission, particularly adults aged 50 years or older. annemergmedRandomized Clinical Trial of an Emergency Department ...PubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient AdmissionTelemetry and targeted testing; escalate to admission if a serious event or actionable diagnosis emerges. PubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient Admission
ED dischargeConvincing neurally mediated or orthostatic mechanism, no suspected cardiac cause, and no serious condition identified during evaluation. ScienceDirectSyncope risk stratification in the ED - ScienceDirectPubMedCardiac findings and observation duration in patients with syncope in the emergency department: a cohort studyAddress reversible contributors, particularly medication-related hypotension, and provide follow-up appropriate to recurrent or unexplained events. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCScienceDirectSyncope risk stratification in the ED - ScienceDirect

Risk Assessment

Identify high-risk features before assigning a disposition

Use history, vital signs, ECG, and targeted laboratory testing to detect actionable risk.

Obtain a 12-lead ECG and treat it as a disposition-changing test. Acute ischemic changes, dysrhythmia, significant conduction abnormality, prolonged QT interval, and bundle-branch block are high-risk findings that support hospital-based evaluation. PubMedRisk stratification of adult emergency department syncope patients to predict short-term serious outcomes after discharge (RiSEDS) study In an older-adult cohort, an abnormal ECG independently predicted 30-day serious events. PubMedPredictors of 30-Day Serious Events in Older Patients with Syncope

Interpret ED blood pressure at both extremes. Canadian Syncope Risk Score predictors include mean ED systolic blood pressure below 90 mm Hg or above 180 mm Hg. PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC In older patients, triage systolic blood pressure above 160 mm Hg was associated with 30-day serious events, alongside age older than 90 years, male sex, known arrhythmia, abnormal ECG, and elevated troponin I. PubMedPredictors of 30-Day Serious Events in Older Patients with Syncope

Order troponin when clinical evaluation raises concern for ischemia or cardiac risk, then incorporate an elevated result into disposition rather than treating it as an isolated screening abnormality. Elevated troponin is a Canadian Syncope Risk Score predictor and independently predicted 30-day serious events in older adults. PubMedPredictors of 30-Day Serious Events in Older Patients with SyncopePubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC Assess dyspnea, anemia or bleeding, heart failure, and symptoms of acute coronary syndrome because each can reveal a nonarrhythmic cause that requires admission and treatment. ScienceDirectSyncope as an Emergency Department Presentation of Pulmonary EmbolismPubMedRisk stratification of adult emergency department syncope patients to predict short-term serious outcomes after discharge (RiSEDS) studyPubMedPREDICTING ADVERSE OUTCOMES IN SYNCOPE - PMC

High-risk variables with explicit thresholds reported in syncope cohorts and risk models. ScienceDirectSyncope as an Emergency Department Presentation of Pulmonary EmbolismPubMedPredictors of 30-Day Serious Events in Older Patients with SyncopePubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC
VariableThreshold or featureDisposition implication
Systolic blood pressureMean ED systolic pressure below 90 mm Hg or above 180 mm Hg. PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMCRaises short-term serious-event risk; investigate the hemodynamic cause and use monitored care or admission when serious disease is suspected. PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC
ECGQRS duration 130 ms or greater, QRS axis below 30° or above 110°, or corrected QT interval above 480 ms are Canadian Syncope Risk Score predictors. PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMCTreat as cardiac-risk markers and integrate with history, troponin, and final ED diagnostic impression. PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC
ECG or clinical rule findingsAbnormal ECG, shortness of breath, hematocrit below 30%, systolic blood pressure below 90 mm Hg, or heart-failure history. ScienceDirectSyncope as an Emergency Department Presentation of Pulmonary EmbolismAny feature identifies higher short-term risk in the San Francisco Syncope Rule; investigate the corresponding cardiac, pulmonary, hemorrhagic, or hemodynamic disorder. ScienceDirectSyncope as an Emergency Department Presentation of Pulmonary Embolism
TroponinElevated troponin. PubMedPredictors of 30-Day Serious Events in Older Patients with SyncopePubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMCRaises concern for a serious cardiac process and should influence disposition with the ECG and clinical presentation. PubMedPredictors of 30-Day Serious Events in Older Patients with SyncopePubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC

Etiologic Branches

Use the suspected mechanism to select admission, observation, or discharge

A named mechanism is more useful than undifferentiated “unexplained syncope.”

For suspected arrhythmic syncope, admit or observe with cardiac monitoring when the ECG is abnormal, there is known arrhythmia or structural heart disease, or the event remains unexplained with a concerning cardiac history. Arrhythmia was the most common serious event detected after an initially unrevealing ED evaluation in older adults. PubMedPredictors of 30-Day Serious Events in Older Patients with Syncope During syncope observation studies, clinically significant events included ventricular arrhythmia, Mobitz II or complete heart block, sick sinus syndrome, sinus pause longer than 3 seconds, symptomatic supraventricular tachycardia above 100 beats/min, and symptomatic bradycardia below 60 beats/min. PubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient Admission

For reflex or orthostatic syncope, discharge is reasonable when the mechanism is clinically apparent and there is no cardiac concern. Review medications because diuretics, vasodilators, venodilators, negative chronotropes, and sedatives are implicated in medication-related syncope, particularly among older adults; adjust these agents under close supervision when medication effect is plausible. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCScienceDirectSyncope risk stratification in the ED - ScienceDirectPubMedCardiac findings and observation duration in patients with syncope in the emergency department: a cohort study

For secondary serious causes, admit according to the identified disease rather than a generic syncope pathway. Dyspnea, hematocrit below 30%, systolic pressure below 90 mm Hg, and heart-failure history are high-risk features in the San Francisco Syncope Rule and should direct evaluation toward pulmonary, hemorrhagic, hemodynamic, or cardiac disease. ScienceDirectSyncope as an Emergency Department Presentation of Pulmonary Embolism Serious-event definitions in syncope research include myocardial infarction, pulmonary embolism, aortic dissection, structural heart disease, pulmonary hypertension, and serious arrhythmia. PubMedDevelopment of a Novel Emergency Department Quality Measure to Reduce Very Low-Risk Syncope Hospitalizations

Etiology-based disposition after ED assessment. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCScienceDirectSyncope risk stratification in the ED - ScienceDirectPubMedPredictors of 30-Day Serious Events in Older Patients with SyncopePubMedCardiac findings and observation duration in patients with syncope in the emergency department: a cohort studyPubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient Admission
Suspected mechanismDiscriminating findingsDisposition and next step
Arrhythmic or conduction-related syncopeAbnormal ECG, known arrhythmia, structural heart disease, or monitored detection of clinically important bradyarrhythmia or tachyarrhythmia. PubMedPredictors of 30-Day Serious Events in Older Patients with SyncopePubMedRisk stratification of adult emergency department syncope patients to predict short-term serious outcomes after discharge (RiSEDS) studyPubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient AdmissionAdmit or use monitored observation; arrange definitive cardiac intervention when an actionable rhythm disorder is identified. ScienceDirectRisk Stratification of Older Adults Who Present to the Emergency Department With Syncope: The FAINT ScorePubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient Admission
Structural or ischemic cardiac diseaseHeart-failure history or signs, valvular disease, acute coronary syndrome symptoms, ischemic ECG changes, or elevated troponin. ScienceDirectSyncope as an Emergency Department Presentation of Pulmonary EmbolismPubMedPredictors of 30-Day Serious Events in Older Patients with SyncopePubMedRisk stratification of adult emergency department syncope patients to predict short-term serious outcomes after discharge (RiSEDS) studyPubMedPREDICTING ADVERSE OUTCOMES IN SYNCOPE - PMCAdmit for disease-directed testing and treatment; use echocardiography when structural disease is suspected. PubMedCardiac findings and observation duration in patients with syncope in the emergency department: a cohort study
Neurally mediated or orthostatic syncopeClinically apparent mechanism without suspected cardiac cause or other serious disorder. ScienceDirectSyncope risk stratification in the ED - ScienceDirectPubMedCardiac findings and observation duration in patients with syncope in the emergency department: a cohort studyDischarge without prolonged observation; review hypotensive or rate-slowing medications when relevant. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCScienceDirectSyncope risk stratification in the ED - ScienceDirect
Hemorrhagic, pulmonary, or vascular causeHematocrit below 30%, dyspnea, hypotension, or evidence suggesting pulmonary embolism, aortic dissection, or other serious disease. ScienceDirectSyncope as an Emergency Department Presentation of Pulmonary EmbolismPubMedDevelopment of a Novel Emergency Department Quality Measure to Reduce Very Low-Risk Syncope HospitalizationsAdmit and pursue disease-specific evaluation and treatment. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and Management ...PubMedDevelopment of a Novel Emergency Department Quality Measure to Reduce Very Low-Risk Syncope Hospitalizations

Intermediate Risk

When ED observation can replace routine admission

Observation is a disposition pathway for selected patients, not a substitute for treating an identified emergency.

Consider a structured ED observation protocol for intermediate-risk adults, particularly those aged 50 years or older, when initial evaluation does not identify a condition requiring inpatient treatment. A randomized trial compared an ED observation syncope protocol with routine inpatient admission in this population. annemergmedRandomized Clinical Trial of an Emergency Department ...PubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient Admission Observation should include monitoring directed at detecting the rhythm and structural diagnoses that would change management. PubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient Admission

Escalate from observation to inpatient admission when telemetry or targeted testing identifies ventricular arrhythmia, high-grade atrioventricular block, sinus node dysfunction, significant pauses, symptomatic tachyarrhythmia, symptomatic bradycardia, or another serious diagnosis requiring treatment. PubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient Admission Patients classified as having cardiac syncope were more likely than those with neurally mediated or orthostatic syncope to require observation of at least 12 hours, pacemaker implantation, and hospitalization. PubMedCardiac findings and observation duration in patients with syncope in the emergency department: a cohort study

Use clinical risk scores to organize variables, not to disregard clinician concern. Canadian Syncope Risk Score components include blood-pressure extremes, vasovagal predisposition, heart disease, final ED diagnosis, elevated troponin, QRS duration at least 130 ms, marked QRS-axis abnormality, and corrected QT interval above 480 ms. PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC In a propensity-matched cohort, admission produced little incremental in-hospital detection of serious outcomes among very-low- and low-risk groups, whereas the difference was more pronounced in medium-, high-, and very-high-risk groups. PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC

Practical role of risk stratification in selecting observation versus admission. PubMedPredictors of 30-Day Serious Events in Older Patients with SyncopePubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient AdmissionPubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC
Clinical stateEvidence-based risk signalOperational choice
Very low or low riskAdmission had little incremental detection of serious adverse events compared with discharge in a matched cohort. PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMCDischarge if a benign mechanism is supported and no serious condition is suspected. ScienceDirectSyncope risk stratification in the ED - ScienceDirectPubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC
Intermediate riskNo immediate serious diagnosis but persistent uncertainty after initial evaluation. annemergmedRandomized Clinical Trial of an Emergency Department ...PubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient AdmissionUse ED observation with monitoring and targeted testing rather than routine inpatient admission when appropriate. annemergmedRandomized Clinical Trial of an Emergency Department ...PubMedRandomized Clinical Trial of an Emergency Department Observation Syncope Protocol vs. Routine Inpatient Admission
Medium, high, or very high riskAdmission was associated with more in-hospital detection of serious adverse events than discharge in a matched cohort. PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMCAdmit or continue monitored evaluation, directed by the suspected cardiac or noncardiac cause. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and Management ...PubMedBenefit of hospital admission for detecting serious adverse events among emergency department patients with syncope: a propensity-score–matched analysis of a multicentre prospective cohort - PMC

Older Adults

Lower the threshold for monitored care in frail older adults

Age does not mandate admission, but it changes the consequences of diagnostic error and recurrent events.

Older patients have greater hospitalization and death risk after syncope, with risk compounded by multimorbidity, frailty, and more consequential fall-related injury. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACC Among patients older than 80 years presenting to the ED with syncope, 58% were admitted in national survey data. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACC Use this context to assess whether discharge is functionally safe, especially after an injurious event or when recurrent syncope threatens independence. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACC

Medication review is a required part of the evaluation in older adults. Diuretics, vasodilators, venodilators, negative chronotropes, and sedatives have been implicated in syncope; medication-related syncope appears more prevalent in older patients. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACC If medications are a plausible contributor and serious cardiac disease is not suspected, adjust the responsible regimen with close follow-up rather than defaulting to an extensive inpatient diagnostic admission. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCScienceDirectSyncope risk stratification in the ED - ScienceDirect

Do not attribute syncope to medications or orthostasis without first addressing competing high-risk findings. In older cohorts, known arrhythmia, abnormal ECG, and elevated troponin I predicted 30-day serious events, and arrhythmia was the most common serious diagnosis made after the ED evaluation. PubMedPredictors of 30-Day Serious Events in Older Patients with Syncope

Older-adult factors that modify syncope disposition. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCPubMedPredictors of 30-Day Serious Events in Older Patients with Syncope
FindingWhy it changes dispositionAction
Frailty, recurrent events, or injurySyncope-related falls and recurrent events can lead to trauma, institutionalization, and loss of independence. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCIncorporate home safety and functional consequences into discharge planning; observe or admit if recurrence risk cannot be managed safely. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACC
Potential medication contributionDiuretics, vasodilators, venodilators, negative chronotropes, and sedatives are implicated in syncope. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCReview and adjust likely contributors with close supervision after excluding serious cardiac disease. jacc2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCScienceDirectSyncope risk stratification in the ED - ScienceDirect
Abnormal ECG or troponinBoth predicted 30-day serious events in older adults. PubMedPredictors of 30-Day Serious Events in Older Patients with SyncopeUse monitored evaluation and investigate cardiac causes rather than attributing symptoms to age or polypharmacy. PubMedPredictors of 30-Day Serious Events in Older Patients with Syncope

References

  1. 2017 ACC/AHA/HRS Guideline for the Evaluation and ... - JACCwww.jacc.org · www.jacc.org
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