Mild to Moderate Pulmonary Valvular Stenosis in Infant Sometimes Improves to the Condition Unnecessary to Do PTPV: Doppler Echocardiographic Observation.

Estenose pulmonar valvar discreta: a possível cura espontânea na evolução natural do defeito

“…The knowledge of the natural history of pulmonary valve stenosis allows us to state that moderate and accentuated defects tend to undergo the intensifying of their effects 2,3 and the mild defects, their decrease [2][3][4][5][6][7][8][9][10][11][12][13] .…”

“…Most of the publications also mention a favorable evolution in pulmonary valve stenosis when they present a mild degree of severity [2][3][4][5][6][7][8][9][10][11][12][13] . Few of these 5,7 show an unfavorable evolution of the mild defect, due to the rapid worsening of the condition, similar to what is observed in more severe defects, mainly when exteriorizing occurs early in life.…”

“…The fi rst, by the presence of a physiological pulmonary hypertension in the neonatal period, causing an initial underestimated gradient; and the second, due to the child's rapid growth in the fi rst months of life, which would not be proportional to the pulmonary ring and the valvular elements. Tomita et al 6 , however, have contested such reports by observing a favorable evolution in patients with mild pulmonary valve stenosis younger than 1 one year of age.…”

“…On the other hand, when the defect has a mild impact, its natural history tends to be even more favorable [2][3][4][5][6][7][8][9][10][11][12][13] , although the "spontaneous cure" is a rare occurrence 8 .…”