Clinical meaning
Gestational trophoblastic disease (GTD) encompasses a spectrum of conditions arising from abnormal placental trophoblastic tissue, ranging from benign hydatidiform moles to malignant choriocarcinoma. Complete hydatidiform moles result from fertilization of an empty ovum by one or two sperm, producing 46,XX (all paternal origin) diploid tissue without fetal structures, characterized by diffuse trophoblastic hyperplasia and hydropic swelling of chorionic villi. Partial moles result from dispermic fertilization of a normal ovum, creating triploid tissue (69,XXY) with some fetal structures. GTD produces markedly elevated beta-hCG levels (often greater than 100,000 mIU/mL), which can cause theca lutein ovarian cysts, hyperthyroidism (hCG has structural homology with TSH), and hyperemesis. The nurse monitors serial beta-hCG levels following evacuation (should decline to undetectable within 6 months), assesses for signs of malignant transformation (plateau or rising beta-hCG, vaginal bleeding, pulmonary symptoms from metastases), ensures reliable contraception for 6-12 months of monitoring, educates about the importance of follow-up, and supports the patient through the grief of pregnancy loss combined with concern about malignancy.