Confidence votes 11. According to Wikipedia, the width of the Atlantic Ocean at its narrowest point is 2,848 kilometers (1,770 mi) between Brazil and Sierra Leone.
What causes PNH? It is not fully understood why people develop PNH. Inside the bone marrow, blood cells are made by stem cells (the seed cells of the marrow). PNH occurs due to a change (or mutation) in a gene in one of the stem cells in the bone marrow. This mutation happens in a gene called PIG-A and the cells made by this stem cell lack certain proteins on their surface making them âweakerâ than normal blood cells.
Symptoms. PNH gets its name from one of its more common symptoms. About half of people with PNH pass dark or bright red blood in their urine at night or in the morning. Paroxysmal means sudden, nocturnal means at night, and hemoglobinuria means  blood in the urine ..PNH symptoms are caused by: 1  Broken red blood cells.2  Too few red blood cells (which can cause anemia). 3  Blood clots in your veins.aroxysmal means sudden, nocturnal means at night, and hemoglobinuria means  blood in the urine .. PNH symptoms are caused by: 1  Broken red blood cells. 2  Too few red blood cells (which can cause anemia).