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Biomedical subjects

D Erickson

Publications and source records attributed to D Erickson.

103 records · Page 6Linked to original sources

Amenorrhea following oral contraception.

A prospective study was done on 326 nulliparous women who ceased oral contraception. Follow-up was obtained on 311. The mean age was 20.3 years (S.D. 2.5). Eighty-nine per cent began menstruating within 60 days after stopping therapy, and only 7 took 180 days or longer to menstruate. Late menarche strongly correlated with post-pill amenorrhea (PPA), but continous length of time on oral contraceptives and type of oral contraceptive showed no significant relationship. The incidence of PPA was 2.2 per cent. All women did eventually menstruate spontaneously, the longest period of amenorrhea being 540 days.

Adolescent↗

Immunity to syphilis: passive transfer in rabbits using serial doses of immune serum.

The influence of prolonged treatment with serial doses of immune serum initiated either 2 or 48 h before intracutaneous challenge with Treponema pallidum on the subsequent appearance and development of lesions was studied. Whereas treatment with large doses of immune serum initiated 48 h before treponemal challenge caused a delay of 9 to 20 days in the onset of lesions and marked suppression of lesion development. Treatment initiated 2 h before treponemal challenge failed to delay the onset of lesions and only moderately suppressed their development. Lesion development was suppressed as long as treatment was continued. The significance of the results is discussed.

Animals↗

On the symmetry of limb deficiencies among children with multiple congenital anomalies.

In humans, unpaired organs are placed in a highly ordered pattern along the left-right axis. As indicated by animal studies, a cascade of signaling molecules establish left-right asymmetry in the developing embryo. Some of the same genes are involved also in limb patterning. To provide a better insight into the connection between these processes in humans, we analysed the symmetry of limb deficiencies among infants with multiple congenital anomalies. The study was based on data collected by the International Clearinghouse for Birth Defects Monitoring Systems (ICBDMS). Registries of the ICBDMS provided information on infants who, in addition to a limb deficiency, also had at least one major congenital anomaly in other organ systems. We reviewed 815 such cases of which 149 cases (18.3 %) were syndromic and 666 (81.7 %) were nonsyndromic. The comparisons were made within the associated limb deficiencies, considering the information on symmetry, using a comparison group with malformations associated not involved in the index association. Among the non-syndromic cases, the left-right distribution of limb deficiencies did not differ appreciably between limb deficiency subtypes (e.g., preaxial, transverse, longitudinal). The left-right distribution of limb anomalies did not differ among most types of non-limb anomalies, though a predominance of left-sided limb deficiencies was observed in the presence of severe genital defects - odds ratio [OR], 2.6; 95 % CI, 1.1-6.4). Limb deficiencies (LDs) were more often unilateral than bilateral when accompanied by gastroschisis (OR, 0.1) or axial skeletal defects (OR, 0.5). On the contrary, LDs were more often bilateral than unilateral when associated with cleft lip with or without cleft palate (OR, 3.9) or micrognathia (OR, 2.6). Specifically, we found an association between bilateral preaxial deficiencies and cleft lip, bilateral amelia with gastroschisis and urinary tract anomalies, and bilateral transverse deficiencies and gastroschisis and axial skeleton defects. Of 149 syndromic cases, 62 (41.6 %) were diagnosed as trisomy 18. Out of the 30 cases of trisomy 18 with known laterality, 20 cases were bilateral. In the remainder the right and left sides were equally affected. Also, in most cases (74.4 %) only the upper limbs were involved. In conclusion the left-right distribution of limb deficiencies among some non-limb anomalies may suggest a relationship between the development of the limb and the left-right axis of the embryo.

Abnormalities, Multiple↗

Articulatory correlates of prosodic control: emotion and emphasis.

This study examines mandibular correlates of prosodic control in nonread dialog exchanges, in which the subject is asked to repeat the same correction of one digit in a three-digit sequence consisting of "five" or "nine" followed by "Pine Street." Articulatory and acoustic data were collected for four speakers of American English at the X-ray Microbeam Facilities at the University of Wisconsin. Jaw opening was measured as vertical jaw position at the time of maximum opening. Middle digits perceived by independent listeners as emphasized generally show jaw opening which is larger than the average jaw opening for the utterances in which they occur. As the speaker repeatedly makes the same correction, not only does jaw opening increase significantly on the corrected digit but also the overall amount of jaw opening on all digits in the corrected exchanges increases. Independent separate perception tests show that listeners also perceive the speakers' answers to be more irritated as the speaker repeats the same correction. The findings suggest a local and global use of the jaw opening gesture to produce both linguistic or paralinguistic and extralinguistic information, that is, word emphasis and the emotional tenor of the dialog itself.

Adult↗