Results: 18th and 19th century: Spallanzani recognised the existence of echolocation in the animal model (bats); piezoelectricity is discovered. 20th century: applying echolocation in the SONAR system and brain tumour detection, foreign bodies in organic tissue and intestinal and breast tissue malignancies. 50s and 60s: masses in the left atrium were identified, mitral valve disease description begins, first M-mode echocardiograms are described.
Te fuiste, ella te creyó muertoscielo-abstract scielo-abstract