[Relationship of occupational stress and negative life events with low birth weight].

Objective: To explore the influence of occupational stress and negative life events on low birth weight (LBW).

Methods: 1:1 matched case-control study was employed, in which 438 singleton LBW infants with birth weight less than 2500 g (their pregnancy term being 28 to 42 weeks) served as case group while 438 with singleton term normal birth weight served as control group matched by sex, delivery time and hospital. All of their mothers were inquired by well trained investigators about their socio-demographic characteristics, occupational stress, and negative life events occurring in different pregnancy term.

Congenital pulmonary lymphangiectasis.

Background: Congenital pulmonary lymphangiectasis (CPL) characterized by dilatation of pulmonary lymphatic vessels occurs as a congenital anomaly. With poor prognosis, neonatal presentation of bilateral CPL is associated with the severe compromise of pulmonary gas exchange and high mortality.

Methods: A male infant born at 39 weeks of gestation was found to have CPL.

[Influence of stress from work and negative life events during pregnancy on different types of low birth weight].

Objective: To explore the influence of occupational stress and negative life events that occur during pregnancy on different types of low birth weight (LBW).

Methods: 438 singleton LBW infants (birth weight of less than 2500 g and their pregnancy term from 28 to 42 weeks) were selected as case group, and they were further divided into symmetric LBW infants (337 cases) and asymmetric LBW infants (101 cases). According to situation of each LBW infant, a singleton with full term and normal birth weight was selected as control group matched by sex, pregnancy term, time during delivery and types of hospital.

[Surveillance of antimicrobial susceptibility of Streptococcus pneumoniae and Hemophilus influenzae isolated from children in Guangzhou area between 2003 and 2004].

Objective: To investigate the situation of antibiotic resistance of Streptococcus pneumoniae (Sp) and Hemophilus influenzae (Hi) clinical isolates from children in Guangzhou area.

Methods: The authors cultured, isolated and identified the Sp and Hi strains from nasopharyngeal secretion of patients who visited Guangzhou Children's Hospital for upper respiratory tract infection between 2003 and 2004. K-B disc diffusion and E-test for antibiotic susceptibility were performed for these clinical isolates.

[Validation study on the criteria for clinical classification of small for gestational age infants].

Objective: To study the validity of criteria currently used in China for the classification of symmetric small for gestational age infants (SGA) as compared with its definition.

Methods: This study included 417 inpatients diagnosed as SGA in authors' hospital from January 1998 to June 2002. Symmetric SGA was diagnosed by the following three criteria: (1) the Ponderal Index (PI), (2) the crown-heel length-to-head circumference ratio (BL/HC) issued in Chin J Pediatr (1988;26:164 - 165), as well as (3) the SGA definition.