Some notes on fertility problems in a colombian semi-urban community

Significant efforts in the field of study and control of reproductive habits of the Colombian population have been made in the last few years by local medical groups. This article attempts to illustrate how the data obtained in this program can be meaningfully exploited from the demographic point of view. Although data available at the time of writing did not comply with the principles of scientific sampling procedures, it is thought that such studies can throw some light on particular issues, such as the patterns of mating, the effect of contraception on birth spacing among married couples, and the relation of fecundity to frequency of coitus. This article deals with some methodological issues which center around these problems.

Methodology of true pulmonary blood volume determination

"True" pulmonary blood volume has been determined by three indicator-dilution methods in 96 subjects. In two methods a right or left ventricular mixing chamber is interposed between the injection and sampling sites while in the third such a mixing chamber is absent. The results strongly suggest that a ventricular mixing chamber is essential for valid determination of true pulmonary blood volume.