Abstract
To the Editor: We read with interest the study by Witham et al,1 suggesting that vitamin D supplementation does not improve quality of life or physical functioning in older patients with chronic heart failure (CHF). The authors are to be congratulated on the completion of a pragmatic, randomized, placebo-controlled double blind study using a micronutrient intervention on >100 patients. However, we have some concerns about their patient selection and the nature of the supplement that might attenuate their neutral conclusion. Their patients were not truly a homogeneous CHF group. They were recruited from heart failure clinics, Medicine for the Elderly clinics, and primary care …
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