Heart rats (HR) and blood oxygen saturation (SaO(2)) were monitored before
and during clinically indicated MR examinations of newborns to (a) identify
any temporal relationship between MR scanning and vital sign fluctuations
and (b) assess the reliability of SaO(2) monitoring of dynamic changes. Flu
ctuations in HR (but not in SaO(2)) that are temporally linked to the MR im
age acquisition occur in most neonates during routine clinical MR examinati
ons.