CD4 and peripartum cardiomyopathy: In patients suffering from peripartum cardiomyopathy (PPCM), the number of NK cells was lower and number of CD3+CD4−D8−CD38+ cells was higher than in healthy females after delivery [44], whereas patients with postpartum thyroiditis (PTT) had a lower CD4+ T cell subset and CD4+/CD8+ ratio compared to the healthy group at 3 months after delivery [45].