You may have misunderstood your doctor's comment to say palpitations are normal. Palpitations aren't normal but many individuals have palpitations: Unpleasant sensations of irregular and/or forceful beating of the heart. In some patients with palpitations, no heart disease or abnormal heart rhythms can be found. In others, palpitations result from abnormal heart rhythms (arrhythmias). Arrhythmias refer to heartbeats that are too slow, too rapid, irregular, or too early.
The after effects post surgery do not include palpitations as normal or expected.