thanks for your query,
doppler tells us regarding development of placenta . This helps us to predict how well it is going to work in future. High resistance flow of artery are a predictor of pre-eclampsia and intrauterine growth restriction, which affect 4–10% of all pregnancies and are the leading cause of premature iatrogenic deliveries and maternal morbidity. Other parameters of your scan are normal.
The medicines which are given are helpful in decreasing this risk. So along with medicines, frequent scan will also be necessary in your case to detect any problem at earliest.
Best of luck and take care..
Hope it helps you...