NPPB and Recurrent lower respiratory tract infections: Pro BNP was discovered to be significantly higher in patients with hospitalization, growth retardation, lower respiratory tract infection, and organ failure, however, when assessing each situation (<i>p</i> = 0.001, <i>p</i> = 0.011, <i>p</i> = 0.001, <i>p</i> = 0.007, respectively).