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Biomedical subjects

Christopher C Butler

Publications and source records attributed to Christopher C Butler.

12 recordsLinked to original sources
PubMed2006

Oral vitamin B12 versus intramuscular vitamin B12 for vitamin B12 deficiency: a systematic review of randomized controlled trials.

BACKGROUND: Vitamin B(12) deficiency is common, increasing with age. Most people are treated in primary care with intramuscular vitamin B(12). Several studies have reported equal efficacy of oral administration of vitamin B(12). OBJECTIVES: We set out to identify randomized controlled trial (RCT) evidence for the effectiveness of oral versus intramuscular vitamin B(12) to treat vitamin B(12) deficiency. METHODS: We conducted a systematic review searching databases for relevant RCTs. Outcomes included levels of serum vitamin B(12), total serum homocysteine and methylmalonic acid, haemoglobin and signs and symptoms of vitamin B(12) deficiency. RESULTS: Two RCTs comparing oral with intramuscular administration of vitamin B(12) met our inclusion criteria. The trials recruited a total of 108 participants and followed up 93 of these from 90 days to 4 months. In one of the studies, mean serum vitamin B(12) levels were significantly higher in the oral (643 +/- 328 pg/ml; n = 18) compared with the intramuscular group (306 +/- 118 pg/ml; n = 15) at 2 months (P < 0.001) and 4 months (1005 +/- 595 versus 325 +/- 165 pg/ml; P < 0.0005) and both groups had neurological responses. In the other study, serum vitamin B(12) levels increased significantly in those receiving oral vitamin B(12) and intramuscular vitamin B(12) (P < 0.001). CONCLUSIONS: The evidence derived from these limited studies suggests that 2000 microg doses of oral vitamin B(12) daily and 1000 microg doses initially daily and thereafter weekly and then monthly may be as effective as intramuscular administration in obtaining short-term haematological and neurological responses in vitamin B(12)-deficient patients.

Administration, Oral↗
PubMed2006

Clinical course of suspected viral sore throat in young adults: cohort study.

OBJECTIVE: To evaluate the natural clinical course of suspected viral sore throat. DESIGN: Prospective cohort study. SETTING: Five military camps in Norway. METHODS: In a randomized placebo-controlled trial comparing the effect of bovine colostrum tablets or placebo on non-streptococcal sore throat in young adults no statistically significant difference in illness duration was found. The participants were thus regarded as one cohort. The authors analysed 10.0 cm visual analogue scales (VAS) scores for 'sickness' and sore throat, using 1.0 cm as a cut-off for recovery. They furthermore explored whether the VAS for sore throat was a good test to discriminate between recovered/not recovered by use of a receiver operating characteristic (ROC) curve. RESULTS: For sore throat, it was found that 51% had recovered by day 6 and 91% had recovered by day 8. Similarly for sickness, 65% had recovered by day 6 and 94% by day 8. The daily VAS scores for 'sickness' and sore throat were highly correlated (p = 0.001). The mean day of recovery from 'sickness' and sore throats (based on VAS scores) was 5.5 and 4.7 respectively and 5.3 based on the dichotomous outcome for throat pain. The ROC curve revealed that a VAS score < 1.0 was the best cut-off point for recovery, with a sensitivity of 0.74 and a specificity of 0.90. CONCLUSION: Almost all the patients had recovered by day 8. A high correlation was found between sickness and sore throat. These data will assist clinicians and others promoting self-care to set realistic expectations regarding recovery from URTI in young adults.

Acute Disease↗
PubMed2005

Do clinical findings in lower respiratory tract infection help general practitioners prescribe antibiotics appropriately? An observational cohort study in general practice.

BACKGROUND: Antibiotics are over-prescribed for lower respiratory tract infection (LRTI). The influence of clinicians' history and examination findings on antibiotic prescribing for LRTI has not been directly assessed, and the extent to which these clinical findings predict appropriate antibiotic prescribing is unknown. A clearer understanding is crucial to achieving evidence-based prescribing. OBJECTIVES: To directly assess the influence of general practitioners' history and examination findings on antibiotic prescribing for LRTI, and to explore the extent to which these clinical findings predict appropriate antibiotic prescribing. METHODS: In this observational cohort study 25 GPs in The Netherlands were recruited during routine consultations and 247 adult patients with a clinical diagnosis of LRTI. The GPs recorded clinical information. Odds ratios (ORs) with 95% confidence intervals (CIs) for clinical variables predicting a prescription for an antibiotic were calculated. The relationship between antibiotic prescription and radiographic evidence of pneumonia was explored in order to gauge appropriateness of antibiotic prescribing. RESULTS: Auscultation abnormalities (OR 11.5; 95% CI 5.4-24.7), and diarrhoea (OR>11) were strongly associated with antibiotic prescribing. An antibiotic was prescribed for 195 (79%) patients. Assuming that an antibiotic definitely needs to be prescribed only for patients with pneumonia, antibiotics may have been inappropriately prescribed for 166/193 (86%) of the patients. Antibiotics were not prescribed for 5 of the 32 (16%) patients with a radiographic diagnosis of pneumonia. CONCLUSIONS: Abnormal findings on auscultation in patients with LRTI strongly predict antibiotic prescribing and this is probably inappropriate for most patients. These results should prompt GPs to consider the extent to which finding 'crackles/rhonchi on auscultation' influences their decisions to prescribe antibiotics for their patients with LRTI, and to consider the predictive value of individual clinical signs in reaching evidence-based prescribing decisions.

Adolescent↗
PubMed2005

Treating patients not diagnoses: challenging assumptions underlying the investigation and management of LRTI in general practice.

OBJECTIVES: Many clinicians treat patients with a lower respiratory tract infection (LRTI) due to bacterial infection with antibiotics, and regard antibiotic treatment as obligatory for patients with radiographic evidence of pneumonia. The necessity of antibiotic treatment is largely unknown and rarely challenged. PATIENTS AND METHODS: Twenty-five general practitioners (GPs) recorded clinical information on 247 adult patients presenting with LRTI. Standard microbiological, susceptibility and serological analysis, and chest radiography was performed for all patients. At 28 days after entry into the study, the GPs took a history and conducted a physical examination again and decided whether or not the patient was fully recovered. RESULTS: Thirty of 63 patients with cultured pathogenic bacteria were either not treated with antibiotics, or treated with an antibiotic to which the cultured bacterium was non-susceptible. All but one recovered spontaneously, although it took more than 28 days for two patients. The other patient recovered with an additional course of antibiotics. Five patients from this cohort with radiological evidence of pneumonia fully recovered without antibiotic treatment. CONCLUSIONS: Not all patients with bacterial LRTI and/or pneumonia require antibiotic treatment in order to recover. Managing the patient rather than treating a diagnosis appears safe and effective in general practice.

Adolescent↗
PubMed2005

Predicting the clinical course of suspected acute viral upper respiratory tract infection in children.

BACKGROUND: Suspected acute viral upper respiratory tract infection (SAVURTI) is the commonest acute reason why children consult in general practice. The clinical course varies widely and about one in five children re-consult for the same SAVURTI episode. If clinicians had feasible tools for predicting which children are likely to suffer a prolonged course, then additional explanations and possibly treatments could be provided at the initial consultation that might enable carers to manage the condition without re-consulting. OBJECTIVE: To identify features available on the day of consulting that might predict a prolonged clinical course among children with SAVURTI. METHOD: Regression analysis using Canadian Respiratory Illness and Flu Scale (CARIFS) data from a randomized controlled trial cohort of children aged from 6 months to 12 years consulting in general practice with SAVURTI. RESULTS: Two variables from the clinician's records ('age' and 'cough') and two variables from the CARIFS completed by carers on the day of consulting ('fever' and 'low energy, tired') explained approximately 15% of the variation present in CARIFS scores on day seven. CONCLUSION: Children and carers may benefit from a clear account of the evidence that the clinical course of RTIs in children varies widely and may be longer that expected, and that prediction for individuals is difficult.

Acute Disease↗
PubMed2004

Communicating about expected course and re-consultation for respiratory tract infections in children: an exploratory study.

Acute respiratory tract infection is the commonest reason for children consulting, and about one-fifth re-consult for the same illness episode. Fifty-nine audiotape recordings from nine general practitioners (GPs) consulting with children with acute respiratory tract infections were examined. Prognosis was mentioned in only 22 consultations, with GPs predicting a brief course in 11, a possibly longer than expected course in six, and with predicted duration not made explicit in five. Carers were invited to re-consult if they were 'unhappy' with the child's condition in 11 consultations, and specific triggers to re-consult were provided in 15. A patient information leaflet was given out only once. Providing carers with an evidence-based account of the likely clinical course and communicating specific triggers to re-consult may help them manage more of these illness episodes without re-consulting.

Acute Disease↗