1 Department of Pediatrics, University of California, Los Angeles, UCLA School of Medicine, Hospitals, and Clinic, Los Angeles
To the Editor.
The report of the Second Task Force on Blood Pressure Control in Children1 recommends the use of K4 in preadolescent children because the authors say that K5 readings are frequently difficult to obtain in that age group, and K5 is easier to record in adolescents. We have used K5 in our studies because we are more certain of it. We have challenged the use of K4 because its recognition depends on subjective judgment of a qualitative change in the character of the sounds.2