Walking tests during the exercise training: specific use for the cardiac rehabilitation.

Walk tests, principally the six-minute walk test (6mWT), constitute a safe, useful submaximal tool for exercise tolerance testing in cardiac rehabilitation (CR). The 6mWT result reflects functional status, walking autonomy and efficacy of CR on walking endurance, which is more pronounced in patients with low functional capacity (heart failure - cardiac surgery). The 6mWT result is a strong predictor of mortality. However, clinically significant changes and reliability are still subject to debate - probably because of the ambiguity in terms of the target speed (either comfortable or brisk walking). Of the other time-based walk tests, the 2-minute-walk test is the only one applicable during CR, reserved for patients with severe disabilities by its psychometric properties. Fixed-distance tests (principally the 200m fast walk test) and incremental shuttle walking, tests explore higher levels of effort and may represent a safe and inexpensive alternative to laboratory-based tests during CR. These walking tests may be useful for personalizing prescription of training programs. However, the minimum clinically significant difference has not yet been determined. Lastly, walking tests appear to be potential useful tools in promoting physical activity and behavioural changes at home. Thus, validation of other walk tests with better psychometric properties will be necessary.

A long-term retrospective follow-up study of patients treated with prophylactic lithium carbonate.

Patients suffering from unipolar and bipolar affective illness, who began treatment with prophylactic lithium carbonate during a 5-year period, were followed up and 59 out of 101 interviewed. Most had been taking lithium for at least 13 years: 49% had a complete remission, 41% a partial but significant response, and 10% no response. No specific individual or illness factor was found to correlate with favourable outcome, and no correlation between average serum lithium level and outcome. No side-effects could be associated specifically with the long-term use of lithium, but there was a surprisingly high incidence of clinical hypothyroidism.