In some cultures in the Northern Hemisphere, the astronomical March equinox (varying between 19 and 21 March) is taken to mark the first day of spring, and the Northern solstice (around 21 June) is taken as the first day of summer. In other traditions, the equinox is taken as mid-spring.
Circulation problems that cause dizziness. You may feel dizzy, faint or off balance if your heart isn't pumping enough blood to your brain. Causes include: 1  Drop in blood pressure.
If you are having cardiac surgery, you must have general anesthesia, which renders you unconscious, immobile, and unable to experience pain or other sensations. You will also have no recollection of anything that occurred while you were under general anesthesia.