Am certain that the factor that prevents us from finding fossils from the Precambian era is that Most rocks from that era are deeply buried. The precambrian is the informal name for the large expanse of time preceding the current Phanerozoic Eon. It began with the Earh's Formation about 4.5 billion years ago and lasted until the advent of multicellular life about 542 million years ago.
Supine hypotension syndrome is the medical term for when a pregnant woman feels lightheaded and has a dip in blood pressure while lying down.
Supine hypotension in pregnancy: what is it?
- When you're pregnant, resting flat on your back might make some symptoms, including indigestion and shortness of breath, worse. Her blood pressure may also drop as a result of it.
- Supine hypotension syndrome is the medical term for when her blood pressure drops while she is pregnant and laying on her back. When a pregnant woman lies supine, the gravid uterus pushes on the inferior vena cava, resulting in a reduction in central venous return. This condition is known as a supine hypotensive syndrome (also known as inferior vena cava compression syndrome).
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