Isotonic Maintenance Fluids for the Prevention of Hospital-Acquired Hyponatremia. The use of isotonic fluids in maintenance fluids for the prevention of hospital-acquired hyponatremia in acutely ill patients was initially controversial,58,59 owing mainly to the potential for unintended consequences.
Twice a year according to the book. Some pianos are very stable but some are ready for a tuning after a few months. New pianos need more regular tuning, usually four times a year for the first few years until the âstretchâ is out of the strings. Should you transport your piano to another house, it will need a month to acclimatise to its new surroundings.
Average number of years between tunes for a periodically tuned piano = 5. Average number of pianos tuned per year by piano tuners = 100. Number of piano tuners in the world = (7,000,000,000 / 5.5 * 0.02 * 40%) / 5 / 100 = 20,364.here are 6.5 billion people so call that 2 billion households of which about 15% are in wealthier countries Assume that about 5% of households in the world's wealthier countries have pianos and say, 0.1% in the rest. So that's about 5% of 1 billion.