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Biomedical subjects

H Clark

Publications and source records attributed to H Clark.

69 records · Page 4Linked to original sources
PubMedDate not supplied

Lactation duration: influences of human milk replacements and formula samples on women planning postpartum employment.

OBJECTIVE: To examine the influences of inhospital administration of breast milk replacements and receipt of formula samples on lactation duration among women planning postpartum employment. DESIGN: Prospective design. SETTING: Telephone interviews conducted prenatally and at 6 weeks, 3 months, and 6 months post-partum. PARTICIPANTS: Sixty-nine participants entered the study; 53 completed all scheduled interviews. MAIN OUTCOME MEASURES: Incidence and type of in-hospital human milk replacement, incidence and sources of formula samples, incidence of breastfeeding at 6 weeks postpartum, and duration of lactation. RESULTS: During hospitalization, 19% of infants received formula; the incidence of breastfeeding at 6 weeks and duration of breastfeeding were significantly shorter in these infants compared with infants who were not fed formula. Fifty-nine percent of participants received formula samples from the hospital, 30% received samples from a physician's office, and 51% received samples by mail. Receipt of formula samples by mail was associated with reduced incidence of breastfeeding at 6 weeks and shortened duration of lactation. CONCLUSIONS: Early formula feeding and receipt of formula samples by mail may be barriers to lactation in women employed outside the home.

Adult↗
PubMedDate not supplied

A variable microwave array attenuator for use with single-element waveguide applicators.

The effectiveness of hyperthermia treatments is often limited by temperature inhomogeneity that arises in the treatment field due to variable tissue properties and blood flow. Moreover, blood flow can change during a treatment, leading to the formation of hot and cool areas even if the initial temperature distribution is uniform. A variable microwave array attenuator has been constructed, that will enable the field patterns of single element microwave waveguide hyperthermia applicators to be altered during treatment, to improve temperature homogeneity. The coupling bolus was designed with an array of individually controlled elements, each filled with a microwave absorbing saline solution. Additions or withdrawals of saline are made to alter the power deposition in a specific area of the treatment field. Thermographic measurements were made in muscle equivalent phantom materials, with the bolus/waveguide assembly. Results showed that the variable array attenuator was able to significantly alter the heating pattern of a large waveguide applicator.

Biophysical Phenomena↗
PubMedDate not supplied

The state of NZ's health services and how Labour would address the problems.

Controversy over the funding and provision of health services has escalated again in recent weeks. The following, an abridged version of an address by Labour leader Helen Clark on October 15 at the Dunedin School of Medicine, surveys present directions and sets out Labour's prescription for change.

Financing, Government↗