Left ventricle changes early after breath-holding in deep water in elite apnea divers

作者：Pingitore Alessandro^*; Gemignani Angelo; Menicucci Danilo; Passera Mirko; Frassi Francesca; Marabotti Claudio; Piarulli Andrea; Benassi Antonio; L'Abbate Antonio; Bedini Remo

来源：Undersea & Hyperbaric Medicine, 2010, 37(1): 13-21.

Purpose: To study by ultrasounds cardiac morphology and Function early after breath-hold diving ill deep water In elite athletes.
Methods: Fifteen healthy male diver's (age 28+/-3 year's) were studied using Doppler-echocardiography immediately before (basal condition, BC) and two minutes after breath-hold diving (40 meters, Mite post-apnea condition, APAC) Each subject performed a series of three consecutive breath-hold dives (20 - 30 and 40 m depth)
Results: End-diastolic. left ventricular (LV) diameter (EDD) and end-diastolic LV volume (EDV) increased significantly (1)<0.01). Stroke Volume (SV), cardiac index (CI), septal and posterior systolic wall-thickening (SWT) also significantly increased after diving (p<001) No wall motion abnormalities were detected, and wall motion score index was unchanged between BC and APAC. Doppler mitral F. wave increased significantly (1)<0.01), whereas the A wave was unchanged(l. Systemic Vascular resistance (SVR) decreased significantly after diving (p<0.05) In the factor analysis, filtering out the absolute values smaller than 0 7 in the loading matrix. it resulted that factor I consists of EDV, posterior SWT, SV and CI, factor II of diastolic blood pressure, waves A and E and factor III of heart rate and SVR.
Conclusions: Systo-diastolic functions were improved in the early period after deep breath-hold diving due to favorable changes In loading conditions relative to pre-diving,. namely the recruitment of left ventricular preload reserve and the reduction ill afterload

• 出版日期2010-2