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Biomedical subjects

D Field

Publications and source records attributed to D Field.

35 records · Page 2Linked to original sources
PubMed1986

Fear of death and dying in medical students: effects of clinical experience.

Changes in the perception of death and dying during medical training were assessed, to test the hypothesis that fear is increased by exposure to dying patients. In general, clinically experienced medical students did not consistently differ from clinically inexperienced students in the intensity of fear of death. The two groups did differ in the frequency with which they thought about death. Students with clinical experience reported thinking more frequently about their own dying process and about interacting with a dying patient.

Adult↗
PubMed1986

Efficiency of manual resuscitators at birth.

The effectiveness of five neonatal/paediatric manual resuscitators was assessed in a group of babies born by caesarean section. Results showed that devices incorporating a large volume reservoir produced the greatest tidal volume, while those with smaller volume reservoirs could not be considered satisfactory for routine use during neonatal resuscitation.

Apnea↗
PubMed1985

Assessment of HTLV III screening tests in Christchurch.

The Christchurch Hospital blood bank has assessed commercial kits designed to test blood donations for the presence of antibody to the retrovirus responsible for acquired immune deficiency syndrome (AIDS). Twenty of 1002 blood donations have been found to be repeatably, positive by one or more of these commercial kits. None was positive by the Western blot technique. Certain patient groups were found to have an elevated number of false positive reactions. Extreme caution is advised when interpreting screening test kit results from donor populations at low risk of AIDS.

Acquired Immunodeficiency Syndrome↗
PubMed1985

Continuous positive airway pressure via a single nasal catheter in preterm infants.

We present the results of giving continuous positive airway pressure (CPAP) via a single nasal catheter to 20 preterm infants. A beneficial effect in terms of reduced work of breathing (P less than or equal to 0.01) and improved pattern of respiration (P less than or equal to 0.05) are demonstrated. CPAP via a single nasal catheter does not seem to mediate effects inside the thorax unlike CPAP delivered by a tight fitting face mask. Gross variations in CPAP level may result from altering the infant's position.

Apnea↗
PubMed1985

Manipulation of ventilator settings to prevent active expiration against positive pressure inflation.

Recent publications have suggested that in infants receiving artificial ventilatory support a particular pattern of interaction between spontaneous breaths and ventilator inflations (active expiration against each ventilator inflation) may be important in the production of pneumothoraces. We have looked at patterns of interaction from 47 preterm infants studied on 51 occasions. We found that active expiration against the ventilator occurred on a total of 16 occasions. This pattern was prevented on 14 occasions by altering the ventilator settings. In two other babies, the pattern persisted but neither baby developed a pneumothorax.

Carbon Dioxide↗
PubMed1985

Inspiratory time and tidal volume during intermittent positive pressure ventilation.

We measured the tidal volume achieved during intermittent positive pressure ventilation using various inspiratory times with a minimum of 0.2 seconds. Results indicate that tidal volume shows no reduction with inspiratory times down to 0.4 seconds. An inspiratory time of 0.3 seconds, however, is likely to reduce tidal volume by 8%, and at 0.2 seconds a 22% fall may be anticipated.

Humans↗
PubMed1985

Effects of positive end expiratory pressure during ventilation of the preterm infant.

Twenty two babies receiving artificial ventilator support were studied on 29 occasions to determine the effects of low levels of positive end expiratory pressure. Mean positive end expiratory pressure during these studies was 2.6 cm H2O. Changes in tidal volume, minute volume, compliance, and transcutaneous gas trends produced by the use of positive end expiratory pressure were investigated. Positive end expiratory pressure consistently caused a rise in transcutaneous oxygen tension. Changes in transcutaneous carbon dioxide tension after the introduction of positive end expiratory pressure were less consistent and not of the same magnitude as the observed reduction in minute ventilation. Compliance values fell with the use of positive end expiratory pressure.

Apnea↗
PubMed1978

A possible explanation as to why the newly sighted commonly perform well on pseudoisochromatic colour vision tests.

Patients whose vision has been restored after long periods of blindness commonly experience difficulty in perceiving. Parodoxically, such patients often perform well on pseudoisochromatic colour-vision tests. A well-known example is Gregory and Wallace's subject, S.B. who performance on the Ishihara test was perfect. It is suggested that restoration of vision may be associated with relatively poor visual acuity and that this, by filtering higher spatial frequencies, enhances the legibility of pseudoisochromatic test patterns. Two experiments confirm that the Ishihara plates are more legible when seen as defocused images.

Blindness↗
PubMedDate not supplied

Calculation of mean airway pressure during neonatal intermittent positive pressure ventilation and high frequency positive pressure ventilation.

Because mean airway pressure (MAP) is extensively used to quantify ventilation administered during the neonatal period, the accuracy and reproducibility of the techniques currently used to define MAP were assessed. All techniques were found to compare closely with MAP measured by integration of the pressure wave form even at ventilator rates in excess of 100 breaths per minute. It was therefore concluded that all methods currently used are satisfactory for clinical use.

Humans↗
PubMedDate not supplied

Determinants of the first inspiratory volume and functional residual capacity at birth.

We have investigated the pattern of pressure and volume changes that occur in vaginally delivered, full-term infants during the onset of spontaneous respiration. Within a few seconds of delivery of the head, simultaneous measurements were made of stomach and esophageal pressure changes together with volume changes determined at the mouth. Values obtained for volume were very similar, but pressure changes were of a greater magnitude than previously reported. A significant correlation has been shown between first inspiratory volume and functional residual capacity (FRC) at the end of the first breath (p less than 0.004). No significant relationship was found between first inspiratory pressure and FRC. However, using a calculated index of inspiratory pressure and time ("inspiratory effort"), a significant relationship of this to FRC was observed (p less than 0.02).

Delivery, Obstetric↗
PubMedDate not supplied

Neonatal extracorporeal membrane oxygenation.

Extracorporeal membrane oxygenation is an effective life support technique that has had most success in the treatment of neonatal cardiopulmonary failure. We review the technique and its potential indications and present the latest UK and worldwide survival data.

Extracorporeal Membrane Oxygenation↗
PubMedDate not supplied

Emotional involvement with the dying in a coronary care unit.

The conflict between professional distance and emotional involvement has been identified as a central problem for nurses in their care of dying patients. While some nurses may attempt to maintain their professional distance, individualised methods of patient care encourage the development of emotional involvement between nurses and their patients. Where such nursing methods are used it is essential that appropriate ways exist of handling the problems which such involvement may cause nurses. In the coronary care unit studied, the organisation of nursing work facilitated close and continuing contact between nurses and their patients, thereby increasing the chance that emotional involvement would develop. The death of a patient was not viewed by the nurses as a 'failure', but there were sometimes difficulties for them arising from their involvement with the patient. This paper describes the handling of death and dying in the unit, and some of the issues surrounding emotional involvement and communication with dying patients.

Attitude to Death↗