The respiratory subtype of panic disorder: reflections on the past and future of biological psychiatry

of a paper reviewing the respiratory subtype of panic disorder in the Brazilian Journal of Psychiatry 1 is timely, given the recent passing of Donald Klein, who, among his multiple seminal contributions, initiated work in this area. Don inspired many researchers to follow in his footsteps, amongst them Antonio Nardi's Brazilian group, which authored this paper, and Jack Gorman's group at Columbia University, which pursued related questions.