70 year old male patient monitored during small bowel-esophageal bypass. Patient has a history of COPD.
Rhythm analysis indicates sinus tachycardia with a a long QT interval.
This encounter highlights Long QT syndrome, a dangerous condition where repolarization of the heart is abnormal. Long QT syndrome can be roughly identified (only at normal heart rates!) by observing the QT interval length. If this is greater than 50% of the RR interval, the QT is considered prolonged. For abnormal heart rates such as the sinus tachycardia seen here, the QTc should be calculated! Long QT syndrome is caused by genetic disorders, certain drugs, or electrolyte imbalances. It can result in dangerous arrhythmias and lead to fainting or even sudden cardiac death.
Source: PhysioNet MGH081