Epstein M
Am Fam Physician. 1985 Apr;31(4):123-37.
Beyond the age of 30, kidney size begins to decrease, and there are accompanying decreases in total renal blood flow, outer cortical flow, glomerular filtration rate and the ability both to conserve and to excrete sodium. There is also a decline in concentrating ability and possibly in diluting ability. These changes make the elderly patient more susceptible both to hyponatremic and to hypernatremic states.
30岁以后，肾脏大小开始缩小，同时肾血流量、肾外皮质血流量、肾小球滤过率以及保钠和排钠能力均随之下降。浓缩能力也会下降，稀释能力可能也会下降。这些变化使老年患者更容易发生低钠血症和高钠血症。
