ee
axis deviation“wes normal or to the right in most
individuals. Lefraxis deviation, and only of moderate degree, was present in six individuals, two in
vears of age in the exposed group. and then toa
subjects was vertical. In 22 subjects it was inter-
amount of arteriosclerosis was fairly well distributed between both populations, as can be seen in
the vounger unexposed group, three in the older
unexposed group, and one in the older exposed
group. The electrical position of the heartina
greqat majority of both the unexposed and exposed
mediate and in 9 ,all unexposed) it was moder-
atelv horizontal. Rotation of the heart electrically
in the combined groups was clockwise in 25 subjects and counterclockwise in 36, with about equal
distribution between the exposed and unexposed
groups.
4. RSTandT Waves. Abnormal variations were
carefully noted for indications of coronary or myocardial insufficiency and/or mvocardial disease or
damage. Deviations of the RST segment from the
isoelectric line were found to be minimal; they oc-
curred in onlyfive of the 84 unexposed subjects
and in only one of the 38 exposed subjects. T wave
abnormalities were of appreciable degree in only a
few instances in the older group. The abnormalities
were chiefly in lower T waves and wererelated to
hypertensive disease. T wave changes were most
marked in a 51-year-old male ( #80) of the exposed group, who had arteriosclerotic heart disease and auricularfibrillation. Marked RST and
T wave changes were noted in an 81-year-old
male (+46) of the exposed group, who had
degree compatible with age. Since there were no
individuals examined in the unexposed group
>70 years of age for comparison, any assumption
that the arterrosclerosis was increased in these four
individuals by their exposure to fallout radiation is
unwarranted. Otherwise the presence and the
Table 1+. It was not observed in a degree premature or advanced for the given age.
2. Arterial Blood Pressures.
Blood pressures
greater than 140 svstolic and 90 diastolic were
considered abnormal. On this basis in the exposed
group noneof the 24 subjects <50 ofage and seven
of the 16 subjects >50 had hypertension, but
mostly of mild degree. There were 17 cases of hypertension in the unexposed group, 2 in those <(50
vears of age and 15 in those >50. Thediastolic
blood pressure showed only infrequent increase
above the level of 90 mm; as would be expected,
this occurred chiefly in the older group. The over-
all incidence of hypertension for the total popula-
tion examined was 9.2%,
Table 16
ventricular conduction time as noted above.
(£947), a 64-year-old female (#861), a 55-yearold male (+993), a 64-year-old female ( +858),
and a 64-year-old male (+884); the last had
changes sufficient to indicate a healed anterior
septal cardiac infarct.
Other Cardiovascular Observations
1. Peripheral Vascular Findings.
Clinical esti-
mation was madeof the degreeofarterial chariges
in the peripheral vessels (radial, brachial, and dorsalis pedis). The degree of abnormality was graded
by 0 to 4+ sclerosis (see section on aging studies).
Arteriosclerosis was seen chiefly in subjects >50
year of age in both exposed and unexposed groups.
It was not marked exceptin four individuals >70
L1855 74
Observations were
taken on the legs at the mid-calf. In almost all
subjects the pulsation was sufficient to indicate
normal blood flow. Although the readings were
lower in the Marshallese than might be expected
in Caucasians, it appeared that peripheral vascu-
marked hypertensive and arteriosclerotic cardiovascular disease, and had prolonged auriculo-
Among the unexposed population there was evidence of myocardial insufficiency according to
RST and T wave changes in a 5l-year-old male
f
3. Oscillometry Readings.
Ophthalmologica! Findings (% Incidence)
Pterygium
Pinguecula
Corneal pigment
Corneal scars
Arcus senilis
Phthisis bulbi
Nystagmus
Strabismus
Areyll-Robertson pupil
Cataracts
Aphakia
Vitreous opacities
Retinal arteriosclerosis
Chorioretinal scars
Macular degeneration
Drusen
Congenital anomalies
Exposed
Unexposed
23.0
24.0
12.0
9.0
38.0
21.0
22.0
2.6
3.4
26.0
1.3
8.3
0.7
0.7
19.0
1.3
4.1
11.0
1.3
0.0
2.6
3.9
10.3
1.3
0.0
12.3
0.7
0.0
0.9
0.9
1.3
1.3
0.0
0.0