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September 6, 1913


Author Affiliations

Oakland, Cal.

JAMA. 1913;61(10):771. doi:10.1001/jama.1913.04350100049020

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I have been surprised to note that while all physicians who employ artificial pneumothorax agree on the great importance of being closely guided by the manometer readings, they are reading their manometers in different ways. As in many other instances in which the records of one man must be compared with those of others, it is of crucial importance that a uniform method of recording be agreed on.

The commonly used manometer is constructed as depicted, Figure 1, being simply a Class tube filled to zero with a fluid, water. Thoracic pressures are transmitted through a tube, m, x, depress or "suck up" the fluid. If the pressure varies, as during breathing, of course the columns will oscillate.

For example, the left column (Fig. 1), under negative pressure, oscillates from a' to a", and simultaneously the right oscillates from b' to b". During breathing they are in constant motion. Now the question answered so variously is, How

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