Figure 1.

(A) ECG recording from a 2 year old child during a reflex anoxic seizure. Each strip corresponds to 30 seconds of recording. The rhythm is initially sinus tachycardia corresponding to the child running. Following a bump to the elbow, the heart slows considerably to a period of asystole, lasting approximately 16 seconds. The arrow shows the point at whicih the monitor was activated—within seconds of the onset of ECG changes. (B) ECG recording from an 8 month old child in whom syncope was induced by smothering. Each strip corresponds to 30 seconds of recording. The parent was asked to activate the monitor at the onset of symptoms. The arrow shows the point at which the monitor was activated, but it is evident that ECG changes of significant bradycardia are present well before the monitor is activated.