Keiji Ohara

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We report the case of a mitral Carpentier-Edwards pericardial bioprosthesis that was explanted from a 43-year-old female patient because of structural valve deterioration 16 years following implantation. Upon removal, the prosthesis was found to be discolored and all leaflets were stiff and hard, showing extensive calcification, pannus overgrowth, leaflet(More)
We report the case of an 89-year-old patient suffering from endocarditis with septicemia caused by a growth on a pacemaker lead. The entire pacemaker system was successfully removed using cardiopulmonary bypass. Although the patient was an octogenarian in poor condition with a systemic infection, an aggressive operation with careful perioperative management(More)
Three psycho-acoustical experiments were carried out to investigate relative importance of formant frequency and whole spectral shape as cues for vowel perception. Four types of vowel-like signals were presented to eight listeners. The mean responses for stimuli including both formant and amplitude-ratio feature were quite similar to those for the stimuli(More)
We present a 59-year-old woman who underwent combined pulmonary resection for bronchiectasis with massive, recurrent hemoptysis and redo coronary artery bypass. She had previously been hospitalized four times for massive hemoptysis. She had also undergone coronary artery bypass and had symptomatic severe graft disease. We performed simultaneous right middle(More)
A psycho-acoustical experiment was conducted using synthetic vowel-like stimuli to examine effect of formant amplitude in vowel perception. Nine combinations of formant frequencies were examined. For each combination, relative amplitude of the third to the second formants was modified in seven degrees. In eight of the nine combinations, perceived vowels(More)
  • Keiji Ohara
  • Kyobu geka. The Japanese journal of thoracic…
  • 2009
Video-assisted thoracic surgery (VATS) lobectomy provides a minimally invasive technique for treatment of lung cancer, but is still only performed in a few specialized centers around the world. Therefore in a hospital, where only one experienced thoracoscopic surgeon exists, a safe and less invasive surgery is required. From January 2001 to July 2008, we(More)
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