Earlier reports have suggested that the incidence of @entity943 after the Mustard procedure can be reduced if the sinoatrial node (SAN) is protected during surgery. To determine if these initial differences continue after longer follow-up, we examined all ECGs available for three groups of @entity1 operated upon from January, 1965, through December, 1977. Group A included 37 @entity1 who survived the operation prior to January, 1972, when surgical modifications were initiated to protect the SAN; group B included 44 @entity1 available for follow-up who were operated upon from 1972 through 1974; and group C consisted of the 39 @entity1 available for follow-up operated upon from 1975 to 1977. @entity943 were classified as passive (failure of initiation or propagation of the SAN impulse), active ( @entity956 or @entity4710 ), or @entity713 . Results were expressed as the incidence per number of different rhythms during follow-up intervals. The incidence of sinus rhythm in groups B and C (80%) was much greater than in group A (27%) during the first 2 years. However, after 8 years, less than 50% of the rhythms were sinus. Both brady- and tachydysrhythmias were common. Seven @entity1 (6%) required pacemaker insertion for symptomatic @entity1817 . Therefore despite efforts to protect the sinus node, late occurring @entity943 remain a significant problem in the postoperative Mustard @entity1 .

Long-term follow-up of XXXX following the Mustard procedure.

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity713 :: ('MESH:D054537', 'Disease') :: ['atrioventricular (AV) conduction defects'] @entity1817 :: ('MESH:D012804', 'Disease') :: ['sick sinus syndrome'] @entity956 :: ('MESH:D001282', 'Disease') :: ['atrial flutter'] @entity4710 :: ('MESH:D013617', 'Disease') :: ['supraventricular tachycardia'] @entity943 :: ('MESH:D001145', 'Disease') :: ['Dysrhythmias', 'dysrhythmias']
@entity943 :: (MESH:D001145,Disease) :: ['dysrhythmias']
