In the elliptical orbit, the center of mass of the orbiting-orbited system is at one focus of both orbits, with nothing present at the other focus. As a planet approaches periapsis, the planet will increase in speed, or velocity.
Drugs that cause hyponatremia include: 1  Diuretics: Thiazides, bumetanide, indapamide, ethacrynic acid, furosemide. 2  Antidepressants: Selective serotonin reuptake inhibitors, tricyclic antidepressants (amitriptyline, protriptyline, desipramine), monoamine oxidase inhibitors, venlafaxine.
Many possible conditions and lifestyle factors can lead to hyponatremia, including: 1  Certain medications. 2  Heart, kidney and liver problems. 3  Syndrome of inappropriate anti-diuretic hormone (SIADH). 4  Chronic, severe vomiting or diarrhea.  Drinking too much 1  water. Dehydration.  Hormonal 1  changes. The recreational drug Ecstasy.