저자들은 예후가 매우 불량했던 2예의 심근경색증 환자에서 혈청 lactate dehydrogenase isoenzymesd의 extra band($LD_6$)를 경험하였기에 자세한 임상적 경과를 기술하고, 이에 대한 국내 및 국외 문헌의 고찰도 함께 보고하는 바이다.
Serum lactate dehydrogenase isoenzymes are separated 5 fractions($LD_1-LD_5$) in normal serum by agrose electrophoresis. An unusual band on the cathodic side of $LD_5$ isoenzyme has been found on lactate dehydrogenase electrophores is of serum, called $LD_6$, and the presence of which signifies a poor prognosis for the patients of myocardial infarction. In recent, we have experienced $LD_6$ in two patients with myocardial infarction. Cardiac arrest was noted within 24 hours after exhibition of $LD_6$ extraband and they did not recover from their illness.
