Biomedical subjects

V Ossian

Publications and source records attributed to V Ossian.

4 recordsLinked to original sources

PubMedDate not supplied

Undersea psychophysiologic reactions of human organism.

The determinations carried out on 12 divers during the immersion into the sea to a depth between 7 and 29 m, as well as on controls in immersions at 4 m revealed a significant prolongation of the visual reaction time and a marked tachycardia. The changes were more marked at great depths and if exercise was superimposed over hyperbaric stress. A rise in the urinary excretion of 17-HOCS and vanillylmandelic acid and an impairment of the manual dexterity were also found during immersions. The results stress the importance of divers' monitoring during their underwater activity and the necessity of improving their physical training.

17-Hydroxycorticosteroids↗

PubMedDate not supplied

Comparative value of arm and leg exercise testing.

Arm exercise test (AET) is described as an alternative to the classical leg exercise test (LET). The value of these two types of exercise was studied in a group of 32 patients aged 34 to 65 years. The patients performed LET for several reasons and, after 24 hrs, AET under the same conditions. The effort level reached under LET was always greater than that achieved under AET and the calculated functional aerobic impairment (FAI) was 50% greater during AET thus supporting the idea that AET cannot be used instead of LET in determining the functional capacity (NYHA) of cardiac patients. However, AET remains useful for the determination of the occupational working capacity in certain occupational categories. The double product (DP) (or index tension time (ITT) calculated after AET represented 85% of the calculated value after LET. The results proved that MVO2 is similar for both LET and AET, but in the latter at lower levels of exercise (VO2). The LET-DP was greater than the AET-DP in 66.5% of our cases, thus suggesting that AET should be reserved for situations in which LET cannot be performed. This is also supported by the presence of ST depression during AET in only 66% of the 18 subjects with ST depression during LET and in five of the six patients without ST depression, DP-AET was lower than DP-LET.

Adult↗

PubMedDate not supplied

Dipyridamole-exercise association in the diagnosis of ischemic heart disease.

Dipyridamole-exercise ECG test (DET) was found to present a greater sensitivity than exercise or dipyridamole ECG test alone in detecting ischemic heart disease (IHD). A group of 39 patients with probable IHD and negative exercise test was investigated by i.v. dipyridamole administration. Eight subjects presented significant ECG changes. The remaining 31 subjects were submitted to a new exercise test which became positive in 7 subjects (23%). The percentage increases to 38% by taking into account the positive dipyridamole test. The authors concluded that DET substantially improve the diagnosis of myocardial ischemia in subjects with probable IHD and negative exercise test.

Coronary Disease↗

PubMedDate not supplied

Effect of isometric effort upon mitral regurgitation severity--echo Doppler study.

Isometric effort increases the severity of mitral regurgitation (MR) by augmenting the afterload and the regurgitant fraction. The worsening of MR may be different in various patients and can explain the differences in effort capacity of patients with identical rest mitral regurgitation. We studied 25 patients with MR of various etiologies, submitted to handgrip (maximal voluntary contraction), the severity of MR being evaluated by the determination of regurgitant area (colour Doppler). There was a 42% increase of the regurgitant area from 3.26 to 4.66 cm2 (p < 0.05). The increase was greater for ischemic MR (59%) than for MR in dilated cardiomyopathy (26%), the last value not being explained by a lower EF because rest EF was similar in patients with and without an increase of MR severity during maximal voluntary contraction. The individual analysis of the results showed an increase of the MR severity in 1/2 of the patients, in whom the left atrial dimension was greater, though the effort capacity was the same in the two subsets of patients. It is concluded that colour Doppler is a simple and valuable method for studying the influence of isometric exercise upon MR severity, this being increased in 1/2 of the patients, with a positive correlation with ischemic etiology of the disease, left atrial dimension, but not with the patients' effort capacity.

Adult↗