The OESIL score is a four-item risk score developed for people assessed after syncope, or a fainting episode, in an emergency-department setting. It adds one point for each specified finding and returns a total from zero to four. This calculator also displays historical mortality percentages associated with those scores.
The percentage needs its time horizon and study context. OESIL concerns one-year all-cause mortality in its original research; it is not a prediction that someone will have a dangerous event immediately after fainting. It does not identify the cause of the episode.
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How to Use This Calculator
Use findings established during a clinical assessment. Choose Yes or No for age over sixty-five, cardiovascular disease in the clinical history, syncope without a prodrome and an abnormal ECG. Review every selection before calculating: the current form initially has some Yes options selected, which should not be mistaken for verified findings.
Choose Calculate to obtain the sum. The calculator awards one point per Yes and none per No, with equal weights for all four questions. The result depends entirely on those selections; there is no hidden analysis of symptoms or an uploaded ECG.
A person’s uncertainty about a finding is not equivalent to No. If an ECG has not been interpreted or the cardiovascular history is unclear, the required inputs are incomplete. Do not use an apparently low total produced by guessed answers to decide whether assessment is necessary.
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Formula Used
OESIL score = age >65 indicator + cardiovascular-history indicator + no-prodrome indicator + abnormal-ECG indicator. Each indicator is 1 if present and 0 if absent; total range 0–4.
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Variables Explained
Input
Unit or choice
Meaning
Age >65
Yes/No
One point if strictly older than65.
Cardiovascular history
Yes/No
One point for qualifying history.
Syncope without prodrome
Yes/No
One point if warning symptoms were absent.
Abnormal ECG
Yes/No
One point for the clinically established ECG finding.
Age over sixty-five means strictly greater than sixty-five. Someone aged exactly sixty-five does not satisfy that mathematical condition. The calculator asks a binary question rather than accepting the numerical age, so you must make that distinction when selecting the answer.
Cardiovascular disease refers to the relevant clinical history used by the score. This is not a general question about whether someone has ever worried about their heart. A clinician should establish how the documented history fits the score’s definition.
Prodrome means warning symptoms before the episode. The scoring item is phrased negatively: syncope without prodrome. Selecting Yes therefore means the warning symptoms were absent. An abnormal ECG is a clinical finding based on the tracing and its interpretation; this page cannot interpret one.
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Worked Example
Consider a hypothetical person older than sixty-five with an abnormal ECG, no qualifying cardiovascular history and a prodrome before fainting. The points are 1 + 0 + 0 + 1 = 2. The lack of a cardiovascular-history point does not cancel the ECG point.
If the same hypothetical findings instead include a qualifying cardiovascular history, the sum becomes 1 + 1 + 0 + 1 = 3. Adding one criterion increases the score by one, but the historical percentage does not increase by a fixed amount because it comes from a lookup table rather than a linear formula.
The application displays 0 percent for score zero, 0.8 percent for one, 19.6 percent for two, 34.7 percent for three and 57.1 percent for four. These correspond to the original derivation cohort’s reported one-year mortality, not the number of points expressed as a percentage.
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Why Use This Calculator?
The development study used 270 patients and assessed the pattern in a separate prospective validation group of 328. Those groups provide context for the historical table; they do not guarantee that the same percentage applies to every later patient or hospital population.
A score of zero means none of the four selected criteria were present. It does not mean fainting was harmless, that no further evaluation is needed or that the person has literally zero future mortality risk. The displayed zero percent describes an observed group result, not an individual guarantee.
A high score similarly is not a diagnosis of a specific heart condition or a prediction of a certain outcome. The appropriate response depends on the complete assessment. This tool has no blood-pressure field, injury assessment, medication review or treatment recommendation, so it cannot cover every clinically relevant feature of an episode.
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Common Mistakes
Do not confuse OESIL with another syncope score that predicts a different outcome over a different period. A thirty-day serious-event rate and a one-year all-cause mortality rate are not interchangeable. Avoid adding extra points for multiple cardiovascular diagnoses: the history item still contributes at most one.
Check the direction of the prodrome question carefully. Selecting Yes because warning symptoms were present reverses the intended criterion. Do not use a symptom recollection to self-label an ECG as normal. If fainting is happening now or is accompanied by concerning symptoms, seek appropriate clinical assessment rather than completing a score first.
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Frequently Asked Questions
Can a score of zero rule out a dangerous cause?
No. It only records absence of the four selected score features. OESIL is a prognostic classification and does not examine every possible cause of loss of consciousness or every reason for urgent assessment.
Does each point add the same mortality percentage?
No. The points are equally weighted in the sum, but the displayed percentages are separate historical observations. There is no constant percentage increase per point.
Is an age of sixty-five scored Yes?
The criterion is age greater than sixty-five, so exactly sixty-five does not meet it. The binary form does not calculate that boundary from a birth date; the user must select the correct option.
What if I do not know whether an ECG was abnormal?
That input has not been established. Obtain the actual clinical interpretation rather than choosing No to make the form complete. The calculator cannot estimate or interpret an ECG from the other answers.
Can this score decide hospital admission?
It does not make that decision. A clinician must assess the episode, current findings and relevant local practice. The output provides a documented score and historical context rather than an instruction to admit or discharge.
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