II. Definitions
- ST Segment
- Duration from the end of the QRS Complex (S Wave) to the end of the T Wave
- Represents a pause in electrical conduction while awaiting ventricular repolarization after depolarization
III. Causes: ST Elevation
IV. Causes: ST Depression
- See aVR ST Elevation with Diffuse ST Depression
- Myocardial Ischemia (horizontal or downsloping ST depression)
- Right Ventricular Myocardial Infarction (ST depression in precordial leads)
- Associated with ST Elevation in v4R adjunctive ekg lead
- Posterior Myocardial Infarction (ST depression in precordial leads)
- Associated with ST Elevation in V8 or V9 adjunctive ekg leads placed below left Scapula
- Left Ventricular Hypertrophy or Right Ventricular Hypertrophy (repolarization changes)
-
Bundle Branch Block (repolarization changes)
- ST Segment change direction is typically discordant or opposite QRS Complex direction (See Sgarbossa Criteria)
- Central Nervous System Disorder
- Mitral Valve Prolapse
- Acute Pancreatitis (non-specific ST Segment abnormalities)
-
Electrolyte and Metabolic Conditions
- Hypokalemia
- Myxedema or Severe Hypothyroidism (non-specific ST Segment abnormalities)
- Bradycardia and flat or inverted T Waves are more common
- Medication Adverse Effects
- Digitalis Toxicity (sagging or scooped out ST Segment)
- Antiarrhythmic agent
V. References
- Keefe (2008) Complete Guide to EKGs, Jones and Bartlett, Sudbury, p. 18-9
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Related Studies
| Concepts | Finding (T033) |
| SnomedCT | 271337003, 3030002 |
| Italian | Segmento ST dell'elettrocardiogramma, Tratto ST |
| Dutch | ST-segment, elektrocardiogram ST-segment |
| French | Segment ST, Segment ST à l'électrocardiogramme |
| German | ST-Strecke, Elektrokardiogramm ST-Strecke |
| Portuguese | Segmento ST, Electrocardiograma, segmento ST |
| Spanish | Segmento ST, segmento ST (entidad observable), segmento ST, Segmento ST del electrocardiograma |
| Japanese | ＳＴ部分, 心電図ＳＴ部分, STﾌﾞﾌﾞﾝ, ｼﾝﾃﾞﾝｽﾞSTﾌﾞﾌﾞﾝ |
| English | ECG ST segment, Electrocardiogram ST segment, electrocardiogram: ST segment (procedure), electrocardiogram: ST segment, segment st, st segment, segments st, ST segment feature (observable) (observable entity), ST segment feature, ST segment, ST segment (observable entity), ST segment feature (observable) |
| Czech | ST segment na elektrokardiogramu, ST segment |
| Hungarian | Elektrokardiogram ST szakasz, ST szakasz |
Ontology: ST segment depression (finding) (C0520887)
| Definition (NCI_CDISC) | An electrocardiographic finding of ST segment depression below the baseline, often described as up sloping, down sloping or horizontal. (NCI) |
| Definition (NCI) | An electrocardiographic finding of ST segment depression below the baseline, often described as up sloping, down sloping or horizontal. |
| Concepts | Finding (T033) |
| SnomedCT | 429622005, 142095007, 26141007 |
| English | ST DEPRESSED, ST Depression (observable entity), ST Depression, ST segment depression (finding), ECG ST segment depressed, ST segment depressed, ST depressed, Electrocardiogram ST segment depression, electrocardiogram: ST segment depressed, electrocardiogram: ST segment depressed (procedure), depressed segments st, st depression, depressed st segment, depression segment st, depression st, st segment depression, depressed st, depressions st, ST depression (finding), S-T segment depressed, ST DEPRESSION, ST SEGMENT DEPRESSION, ST Segment Depression by EKG Finding, DEPRESSION, ST SEGMENT, ST Segment Depression by ECG Finding, ST depression, ST segment depression, ST Segment Depression |
| Italian | Sottoslivellamento del segmento ST dell'elettrocardiogramma, Tratto ST sottoslivellato, Sottoslivellamento del tratto ST, ST sottoslivellato |
| Dutch | ST verlaagd, ST-segment verlaagd, ST-segment depressie, elektrocardiogram ST-segment depressie |
| French | Segment ST sous-décalé, Dépression du segment ST, ST sous-décalé, SOUS-DECALAGE DE ST, Segment ST sous-décalé à l'électrocardiogramme |
| German | ST gesenkt, ST-Strecke gesenkt, ST-Streckensenkung, ST STRECKENSENKUNG, Elektrokardiogramm ST-Streckensenkung |
| Portuguese | Segmento ST deprimido, ST deprimido, Depressão do segmento ST, DEPRESSAO DO ST, Segmento ST deprimido (ECG) |
| Spanish | ST deprimido, Depresión del segmento ST, Segmento ST deprimido, infradesnivel del ST (entidad observable), ST, DEPRESION, depresión del segmento ST, infradesnivel del ST (hallazgo), infradesnivel del ST, Depresión del segmento ST del electrocardiograma |
| Japanese | 心電図ＳＴ部分下降, ＳＴ低下, ＳＴ部分下降, ｼﾝﾃﾞﾝｽﾞSTﾌﾞﾌﾞﾝｶｺｳ, STﾃｲｶ, STﾌﾞﾌﾞﾝｶｺｳ |
| Czech | Deprese úseku ST, Deprese úseku ST na elektrokardiogramu, Snížený úsek ST, Snížený ST |
| Hungarian | ST szakasz depresszált, ST szakasz depresszió, ST depresszió, Elektrokardiogram ST szakasz süllyedés |
