After a blocked artery is treated with angioplasty to restore blood flow, the artery may become blocked again. This is called restenosis. One way to prevent restenosis is to place a stent inside the artery at the spot where the blockage was cleared by angioplasty. A stent is a tiny, metal mesh tube that is placed with a catheter and permanently embedded within the artery wall to prop open and prevent it from collapsing.
Associations between Agent Orange and other dioxin-contaminated herbicides and structural birth defects like spina bifida, oral clefts, heart defects and hypospadias may be just the âtip of the icebergâ.
Chemical Weapons. 1  Approximately 19 million gallons of Agent Orange were used by the US military in southern Vietnam between 1962 and 1971. 2  Apart from the serious human health effects of Agent Orange - which include cancer and birth defects - the rapid loss of vegetation that it causes leads to severe soil erosion. This contributes to a major drop in species population due to habitat degradation.