On-Demand Sildenafil as a Treatment for Raynaud Phenomenon: A Series of n-of-1 Trials

BACKGROUND

Treatment of Raynaud phenomenon (RP) with phosphodiesterase-5 inhibitors has shown moderate efficacy. Adverse effects decrease the risk-benefit profile of these drugs, and patients may not be willing to receive long-term treatment. On-demand single doses before or during exposure to cold may be a good alternative.

OBJECTIVE

To assess the efficacy and safety of on-demand sildenafil in RP.

DESIGN

Series of randomized, double-blind, n-of-1 trials. (ClinicalTrials.gov: NCT02050360).

SETTING

Outpatients at a French university hospital.

PARTICIPANTS

Patients with primary or secondary RP.

INTERVENTION

Each trial consisted of a multiple crossover study in a single patient. Repeated blocks of 3 periods of on-demand treatment were evaluated: 1 week of placebo, 1 week of sildenafil at 40 mg per dose, and 1 week of sildenafil at 80 mg per dose, with a maximum of 2 doses daily.

MEASUREMENTS

Raynaud Condition Score (RCS) and frequency and daily duration of attacks. Skin blood flow in response to cooling also was assessed with laser speckle contrast imaging. Mixed-effects models were used and parameters were estimated in a Bayesian framework to determine individual and aggregated efficacy.

RESULTS

38 patients completed 2 to 5 treatment blocks. On the basis of aggregated data, the probability that sildenafil at 40 mg or 80 mg was more effective than placebo was greater than 90% for all outcomes (except for RCS with sildenafil, 80 mg). However, the aggregated effect size was not clinically relevant. Yet, substantial heterogeneity in sildenafil's efficacy was observed among participants, with clinically relevant efficacy in some patients.

LIMITATION

The response to sildenafil was substantially heterogeneous among patients.

CONCLUSION

Despite a high probability that sildenafil is superior to placebo, substantial heterogeneity was observed in patient response and aggregated results did not show that on-demand sildenafil has clinically relevant efficacy. In this context, the use of n-of-1 trials may be an original and relevant approach in RP.

PRIMARY FUNDING SOURCE

GIRCI (Groupement Interrégional de Recherche Clinique et d'Innovation) Auvergne Rhône-Alpes (academic funding) and Pfizer.

[Clinical pharmacy: Evaluation of physician's satisfactions and expectations in a French regional hospital]

INTRODUCTION

The purpose of the study was to evaluate physician's satisfaction with the clinical pharmacy activities in a French regional hospital.

METHODS

Data were collected by face-to-face interviews carried out by a public health intern with physicians from 14 different departments of medicine and surgery. A specifically designed questionnaire was used for this study. This contained 18 closed-ended questions, 3 open-ended questions and 6 questions relating to the multidisciplinary analysis of prescriptions of elderly patients.

RESULTS

The questionnaire was proposed to 78 physicians, of which 62 replied (participation rate of 79%). Thirty-seven percent were interns (23/62), 19% were assistants (12/62) and 44% were senior physicians (27/62). Clinical pharmacy satisfaction levels were generally very high. In regard to clinical skills, 87% of the physicians were satisfied with pharmacists' competencies and 91% by the pertinence of transmitted information. Ninety-five percent of the physicians were also satisfied by the logistical aspect and the relationship with pharmacists (reactivity, availability and communication). Analysis of the open-ended questions showed that physicians were in favour of the increased presence of clinical pharmacists on the wards.

CONCLUSIONS

This study shows a high level of physician satisfaction in relation to the clinical pharmacy activities in our hospital, and should be viewed as a strong endorsement of the work of the clinical pharmacy. This study highlights some areas of improvement such as increase presence of the clinical pharmacists on the wards. In order to assess periodically our activity, this study must be repeated in the future.