232
Correspondence
Dr. Morri\otl alid collragurs nieiilionetl tlisli-ihutiona?
REFERENCES
Sarkar, S., jones, 0. W., and Shioura, N’.: Constancy in human sperm DNA content, Proc. Natl. Acad. Sci. U. S. A. 71:3512. 1974. Barker-. F. N., Salisbury, G. W., and Lodge, J. R.: V Intern. Congr. An. Reprod. Art. Insem. Trento 2: 157, 1964. Salisbury, G. W., Hart, R. G., and Lodge, J. R.: The spermatozoan genome and fertility, Ah%.J. OBSTET. GYNECOI.. 128:342, 1977. Jacobs, P. A.: In Beatty, R. A., and Gluecksohn-Waelsch, S., editors: Proceedings of the International Symposium of the Genetics of the Spermatozoon, Copenhagen, 1972, p. 346. Cohen, J.: Nature 215:862, 1967. Mortimer, D.: The survival and transport to the site ot fertilization of diploid rabbit spermatozoa, J. Reprod. Fertil. 51:99, 1977. Cohen, J., and McNaughton, D. C.: J. Reprod. Fertil. 39:297. 1974.
Corticosteroids and respiratory distress syndrome I read with interest the article by Morrison and colleagues in the June 15, 1978, issue of the AMERIC~ZN JOIJRNAL. OF OBSTETRICS AND GYNECOLOGY on corticosteroids and respiratory distress syndrome (RDS). ‘I-hey are to be complimented on the meticulous fashion in which the study was performed; however, there were several points I hope they can clarify. 1 noted that the study- was performed between the years 1972 and 1975. During this time there was little or no literature discussing the association between length of time of membrane rupture and the development of RDS. Additionally there was nothing in the literature about the association of the use of various /3-mimetic agents and acceleration of fetal pulmonq maturity. In Table I of the article, although patients in premature labor in both groups seemed to be equally distributed between treatment and control groups there was no mention of duration of membrane rupture and the distribution of these patients in reference to the length of membrane rupture. Additionally, scvera1 patients received isoxsuprine and ritodrine in the study, and no mention of the distribution of these patients between treatment and control groups was made. Should it turn out that in their study both of these factor-s were equally distributed between Groups I and II, more validity could be placed on the study. Would
plc~
Correspondence
Dr. Morri\otl alid collragurs nieiilionetl tlisli-ihutiona?
REFERENCES
Sarkar, S., jones, 0. W., and Shioura, N’.: Constancy in human sperm DNA content, Proc. Natl. Acad. Sci. U. S. A. 71:3512. 1974. Barker-. F. N., Salisbury, G. W., and Lodge, J. R.: V Intern. Congr. An. Reprod. Art. Insem. Trento 2: 157, 1964. Salisbury, G. W., Hart, R. G., and Lodge, J. R.: The spermatozoan genome and fertility, Ah%.J. OBSTET. GYNECOI.. 128:342, 1977. Jacobs, P. A.: In Beatty, R. A., and Gluecksohn-Waelsch, S., editors: Proceedings of the International Symposium of the Genetics of the Spermatozoon, Copenhagen, 1972, p. 346. Cohen, J.: Nature 215:862, 1967. Mortimer, D.: The survival and transport to the site ot fertilization of diploid rabbit spermatozoa, J. Reprod. Fertil. 51:99, 1977. Cohen, J., and McNaughton, D. C.: J. Reprod. Fertil. 39:297. 1974.
Corticosteroids and respiratory distress syndrome I read with interest the article by Morrison and colleagues in the June 15, 1978, issue of the AMERIC~ZN JOIJRNAL. OF OBSTETRICS AND GYNECOLOGY on corticosteroids and respiratory distress syndrome (RDS). ‘I-hey are to be complimented on the meticulous fashion in which the study was performed; however, there were several points I hope they can clarify. 1 noted that the study- was performed between the years 1972 and 1975. During this time there was little or no literature discussing the association between length of time of membrane rupture and the development of RDS. Additionally there was nothing in the literature about the association of the use of various /3-mimetic agents and acceleration of fetal pulmonq maturity. In Table I of the article, although patients in premature labor in both groups seemed to be equally distributed between treatment and control groups there was no mention of duration of membrane rupture and the distribution of these patients in reference to the length of membrane rupture. Additionally, scvera1 patients received isoxsuprine and ritodrine in the study, and no mention of the distribution of these patients between treatment and control groups was made. Should it turn out that in their study both of these factor-s were equally distributed between Groups I and II, more validity could be placed on the study. Would
plc~
