Figure 4  .

(A) Non-pause dependent torsade de pointes in a neonate.⁴⁷ There is sinus tachycardia with marked T wave alternans. Although there appears to be some R-R alternans (the R-R intervals are shown in milliseconds), the interval immediately preceding the sinus complex from which torsade originates, which would be expected to be the longest interval if this was a pause dependent arrhythmia (*), is actually short (420 ms). Reproduced with permission from the authors and Futura Publishing Company Inc, publisher of the Journal of Cardiovascular Electrophysiology. (B) One of the first cases of congenital long QT syndrome and deafness described.¹⁶ The QT interval is giant and bizarre. Torsade de pointes is not preceded by a pause. Reproduced with permission from Mosby Inc, publisher of Advances in Internal Medicine.