4,199
edits
Repolarization (ST-T,U) Abnormalities: Difference between revisions
Jump to navigation
Jump to search
m
Repolarization (ST-T,U) Abnormalities (view source)
Revision as of 04:29, 13 April 2010
, 13 April 2010→References
mNo edit summary |
m (→References) |
||
| (3 intermediate revisions by the same user not shown) | |||
| Line 7: | Line 7: | ||
Repolarization can be influenced by many factors, including electrolyte shifts, ischemia, structural heart disease (cardiomyopathy) and (recent) arrhythmias. Although T/U wave abnormalities are rarely specific for one disease, it can be useful to know which conditions can change repolarization. | Repolarization can be influenced by many factors, including electrolyte shifts, ischemia, structural heart disease (cardiomyopathy) and (recent) arrhythmias. Although T/U wave abnormalities are rarely specific for one disease, it can be useful to know which conditions can change repolarization. | ||
*Early repolarization (normal variant) | *Early repolarization (normal variant)[[File:early_repol.svg|thumb|300px]] | ||
*Juvenile T waves (normal variant) | *Juvenile T waves (normal variant) | ||
*Nonspecific abnormality, ST segment and/or T wave | *Nonspecific abnormality, ST segment and/or T wave | ||
| Line 16: | Line 16: | ||
*Prominent U waves | *Prominent U waves | ||
*Cardiac Memory|Cardiac Memory | *Cardiac Memory|Cardiac Memory | ||
'''Early repolarization''' is a normal variant of the ST segment, seen in 2-5% of patients, especially young men. Early repolarization is characterized by elevation of the J point and the beginning of the ST segment as well as elevation of the ST segment itself<cite>Wellens</cite>. The ST segment may be concave up (cup-like) or concave (dome-like). These findings are most often present in the middle chest leads V2-V5. | |||
Recently a different form of early repolarization has been associated with idiopathic ventricular fibrillation. This form is most often seen in lead II and consists of a 'hump' in the tail of the QRS complex, without ST elevation. | |||
==References== | |||
<biblio> | |||
#Wellens pmid=18463384 | |||
#Tikkanen pmid=19917913 | |||
</biblio> | |||