Venous access ports: frequency and management of complications in oncology patients.

Totally implantable venous access ports have been in use now for over 20 years. They are valuable instruments for long-term intravenous treatment of patients with cancer. Apart from perioperative difficulties, the typical complications associated with venous access ports are venous thrombosis, port infection, extravasation, pinch off syndrome, dislocation, occlusion and catheter leakages. The vast majority of these complications are avoidable, or at least the complication rate can be reduced with health care personnel training and education of patients. This review will give a broad overview on the frequency and possible complications related to port devices. Furthermore, this review suggests strategies for management including proposals to avoid such complications.

Human chorionic gonadotropin-induced hyperthyroidism in germ cell cancer--a case presentation and review of the literature.

BACKGROUND: Human chorionic gonadotropin (hCG)-induced hyperthyroidism represents a rare paraneoplastic syndrome in hCG-secreting testicular cancer. In most cases, this hyperthyroidism remains subclinical. hCG belongs to the family of glycoprotein hormones with structural homology to thyroid- stimulating hormone (TSH). The thyrotropic potency and thereby the degree of cross reactivity of hCG is determined by several factors, such as content of sialic acid or lack of the C-terminal tail. In the absence of clinical signs of hyperthyroidism, treatment usually consists of specific antitumor therapy which will result in normalization of thyroid function if hCG declines. Where there are clinical signs of hyperthyroidism, overlapping thyreostatic treatment is recommended. CASE REPORT: Here, we report of a young man presenting biochemical signs of hyperthyroidism without clinical signs at the time of diagnosis of non-seminomatous germ cell cancer. Beta-hCG initially exceeded 1,000,000 IU/ml and declined close to normal at the end of cancer treatment. Concomitantly, thyroid hormones returned to the normal range without any thyreostatic therapy. We observed a significant correlation of neta-hCG and thyroid hormones in linear regression analysis (r2 = 0.98, p< 0.05). A concise overview of potential mechanisms of hCG-induced hyperthyroidism in germ cell cancer but also in pregnancy is given and the case discussed according to the cited literature.