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In 8 patients aged 41-66 years, a second left heart catheterisation done 27-98 months after the first study, demonstrated a pressure gradient across the aortic valve, that had not previously existed, or had been trivial. No significant change of the cardiac output had occurred. All but 1 patient were hypertensive. The etiology was rheumatic in 4, degenerative in 4. Electrocardiographic, radiographic, and echocardiographic evolution could not separate the patients with a gradient greater than or equal to 70 mmHg from those whose gradient was less than or equal to 40 mmHg. The intensity of the aortic component of the second heart sound, however, decreased in all former patients, and in only 1 of the latter. Aortic valvular stenosis can arise and rapidly develop in adult patients. Concomitant rheumatic mitral valve disease, coronary artery disease and hypertension can mask and/or modify symptoms, signs and laboratory findings. Changes of the aortic component of the second sound may suggest its occurrence.
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