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CVS is usually performed between 10 and 13 weeks from your last menstrual period. CVS may be chosen over amniocentesis because it may be performed earlier in the pregnancy. Chorionic villus sampling detects chromosome abnormalities (i.e. Down syndrome) and genetic disorders (i.e. cystic fibrosis.).
Surgical cardiac risk is considered low if the risk of a perioperative cardiac event is less than 1 percent, intermediate if 1 to 5 percent, and high if greater than 5 percent 4,7 (Table 14). Patients should have preoperative ECG before undergoing a high-risk procedure. Two guidelines recommend using the Revised Cardiac Risk Index (RCRI) to assess the risk of cardiac complications after noncardiac surgery 4,7 (Table 210). The RCRI consists of five clinical risk factors and one procedural risk factor.