The nurse teaching a pre-conception class would tell participants that they should be most careful about exposure to drugs during which stage of pregnancy?
1. Each stage is equal in risk.
2. Pre-implantation period
3. Third trimester
4. Embryonic
4
Rationale 1: The goal should be to minimize exposure to all drugs for the length of pregnancy, but exposure during some time periods is more critical than exposure at other times.
Rationale 2: During the pre-implantation phase there is no direct link to the mother so exposure to a teratogen either causes death or has no effect.
Rationale 3: The third trimester falls in the fetal period when teratogen exposure is more likely to impair organ function or delay growth than to cause gross structural malformation.
Rationale 4: The embryonic phase poses the greatest risk to fetal development as this is a time of rapid development of internal structures.
Global Rationale: The embryonic phase poses the greatest risk to fetal development as this is a time of rapid development of internal structures. During the pre-implantation phase there is no direct link to the mother so exposure to a teratogen either causes death or has no effect. The goal should be to minimize exposure to all drugs for the length of pregnancy, but exposure during some time periods is more critical than exposure at other times.
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