Richardson, Heather (1971). Archives of Disease in Childhood, 46, 520. Frusemide in heart failure of infancy. Twelve infants with heart failure and one with perinatal oedema were treated with intramuscular frusemide (1 0-1 -25 mg/kg). Frusemide was found to be a safe effective diuretic in infants with heart failure, resulting in clinical improvement, marked excretion of water, sodium, and chloride, with a lesser and more variable effect on potassium excretion. Complications were uncommon with this dose. The drug is most effective in acute pulmonary oedema or acute worsening of heart failure, but day-to-day control of persistent heart failure is more easily obtained by using repeated doses of oral or intramuscular frusemide plus, if needed, aldactone A or triamterene.There is little quantitative information on the use of frusemide in infancy. Reimold (1964) reports on its administration to 3 infants with perinatal oedema but observed little improvement; however, one infant aged 6 weeks, with heart failure due to myocarditis, responded well to a dose of 0 4-1 mg/kg of frusemide.Thieffry, Joly, and Ferchiou (1969) reported a significant diuresis and natriuresis in 8 infants with congenital heart disease, and 5 infants with other causes of fluid retention. In one infant, circulatory collapse was provoked, but they concluded that frusemide was a safe effective diuretic in a dose of 0 * 7-1 * 25 mg/kg. Therefore it was decided to carry out a further study to assess the usefulness of frusemide as a diuretic in a series of infants admitted with fluid retention predominantly due to heart failure.Short-term Studies Eleven infants aged 3 days to 6 months were studied. Details of diagnosis, sex, age on admission, and mode of presentation are given in Table I. The usual criteria for a diagnosis of heart failure were used (Lees, 1969); however, tachypnoea of more than 60 respirations per minute and cardiac enlargement on x-ray in patients with congenital heart disease were considered to be sufficient to make the diagnosis. Of the 11 infants, 9 were moderately to critically ill, their most striking clinical features being tachypnoea and exhaustion (Table II). Frusemide in a dose of 1 0-1-25 mg/kg was given intramuscularly under the following conditions.(a) Initially, when a diagnosis of heart failure was made; (b) when deterioration in an infant's condition occurred, usually associated with increasing tachypnoea, and clinically attributed to increasing heart failure; and (c) when an increase in weight of 2% total body weight occurred in a 12-hour period.At the time of initial examination, 8 of the children had been digitalized and one had received one dose of mersalyl. During the period of the study no other diuretic therapy other than frusemide was given.Control urines (24-hour) were obtained from all the infants on admission, and twice a week thereafter. This was relatively easy in male infants using Paul's tubing. In female infants urine collecting bags (Down Bros.) were employed with less successful results. Accordingly, a...