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Biomedical subjects

Chris Longhurst

Publications and source records attributed to Chris Longhurst.

4 recordsLinked to original sources
PubMed2006

Alphanumeric paging in an academic hospital setting.

OBJECTIVE: To determine whether implementation of an alphanumeric-paging system would improve physician work environment. DESIGN: Surveys were distributed to all general surgery residents, faculty, and nurses before and after implementation of an alphanumeric-paging system. Housestaff also kept a detailed log of paging activity before and after the intervention. MEASUREMENTS: User satisfaction with the paging system was measured using a Likert format survey. Interruptions to patient care and pages requiring a call back were tracked using paging logs. RESULTS: Physician perceptions of the capability of text paging before the intervention were high and did not differ significantly postintervention. For nursing staff, postintervention perceptions of the text-paging system were significantly more positive than preintervention, especially with regard to perceived improvements in patient care (54.1% versus 81.6%, P < .05). Residents' paging logs reflected significantly decreased interruptions to patient care after the intervention (28.2% versus 46.9%, P < .05), with less pages requiring a call back (100% versus 73.6%, P < .05). CONCLUSIONS: Study participants rated the alphanumeric-paging system highly. Text-paging technology has the potential to reduce interruptions in patient care and improve physician work efficiency and satisfaction.

Chi-Square Distribution↗
PubMed2003

A practical guideline for calculating parenteral nutrition cycles.

BACKGROUND: Both physiologic and psychological reasons for cycling total parenteral nutrition (TPN) have been well established. Despite widespread acceptance of this practice, the only previously published method for calculating TPN cycle rates is inherently flawed. METHODS: A mathematical formula was derived to facilitate reliable calculation of cyclic TPN flow rates as a function of total volume and cycle time. A publicly accessible website was subsequently developed to expedite rapid determination of TPN cycles. RESULTS: A fail-safe method of calculating TPN cycle flow rates can be expressed as F = V/(4T-10), where F is equal to the basal flow rate (mL/h), T is equal to the desired cycle time (hours), and V is equal to the total volume of TPN (mL) to be delivered in 24 hours. The basal flow rate and twice the basal flow rate are used for the first and last 2 hours of the TPN cycle, and the remainder of the cycle runs at 4 times the basal flow rate. TPN cycles may be easily calculated online using this formula at http://peds.stanford.edu/tpn.html. CONCLUSIONS: We have developed a fail-safe method of calculating TPN cycle flow rates that will consistently deliver the desired volume and have made an online implementation of this formula publicly available.

Journal Article↗
PubMed2002

Quinoxyfen--resistance management and sensitivity monitoring in wheat: 1995-2000.

Wheat powdery mildew, Blumeria (= Erysiphe) graminis DC f sp tritici Marschal is one of the most important foliar diseases of cereals in Europe, and has shown a high potential for adaptability in sensitivity towards modern fungicides during the last 20 years. Quinoxyfen is a surface-mobile fungicide from a new chemical class that has been commercially used for the control of B graminis in Europe since 1997. When the compound was launched, a Resistance Management Strategy was implemented which included: no seed treatments, no autumn use, a specified window of application and recommendations for appropriate tank-mixing. To assess the success of this Management Strategy, a European-wide resistance monitoring programme was carried out between 1995 and 2000 using spore trap sampling, and a whole plant assay. The mean EC50 values found by year were 0.060 mg litre-1 in 1995, 0.052 mg litre-1 in 1996, 0.071 ml litre-1 in 1997, 0.039 mg litre-1 in 1998, 0.039 mg litre-1 in 1999 and 0.063 mg litre-1 in 2000. No new sensitivity classes were found. The slight shift to lower sensitivity in 1998 and 1999 was correlated with similar shifts in three wildtype isolates, and was ascribed to experimental variation. The monitoring programme will continue to assess the long-term impact of the management recommendations on the resistance status of quinoxyfen.

Drug Resistance, Fungal↗