Some types of cardiac arrhythmias result in inadequate cerebral blood flow, which in some cases can cause a sensation of lightheadedness or culminate in frank syncope. It is very unusual for a cardiac arrhythmia to cause a spinning sensation. Practically, if disequilibrium is followed by loss of consciousness, then a cardiac arrhythmia may be suspected. In cases of disequilibrium that do not lead to loss of consciousness, a cardiac arrhythmia is less likely.