A ia Pe iliemain tented iW a "ah SSA2 RR tae 24 axis deviation was normalor to the right in most individuals. Left axis deviation, and only of moderate degree, was present in six individuals, two in the younger unexposed group, three in the older unexposed group, and one in the older exposed group. The electrical position of the heart ina great majority of both the unexposed and exposed subjects was vertical. In 22 subjects it was intermediate and in 9 (all unexposed) it was moderately horizontal. Rotation of the heart electrically in the combined groupswasclockwise 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 myocardia] insufficiency and/or myocardial disease or damage. Deviations of the RST segmentfrom the isoelectric line were found to be minimal; they occurred in only five of the 84 unexposed subjects and in only one of the 38 exposed subjects. T wave abnormalities were of appreciable degree in only a fewinstances 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 auricular fibrillation. Marked RST and T wave changes were noted in an 81-year-old male (#46) of the exposed group, who had marked hypertensive and arteriosclerotic cardio- years of age in the exposed group, and then toa degree compatible with age. Since there were no individuals examined in the unexposed group >70 years of age for comparison, any assumption that the arteriosclerosis was increased in these four individuals by their exposureto fallout radiation ts unwarranted. Otherwise the presence and the amountof arteriosclerosis was fairly well distributed between both populations, as can be seen in Table 14. It was not observed in a degrce premature or advanced for the given age. 2. Arterial Blood Pressures. Blood pressures greater than 140 systolic and 90 diastolic were considered abnormal. Onthis basis in the exposed group noneofthe 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 years of age and 15 in those >50. The diastolic blood pressure showed onlyinfrequent increase above the level of 90 mm; as would be expected, this occurred chiefly in the older group. The overall incidence of hypertension for the total population examined was 9.2%. 3. Oscillometry Readings. DOE ARCHIVES . vascular disease, and had prolonged auriculo- ventricular conduction time as noted above. Among the unexposed population there wasevidence of myocardial insufficiency according to RST and T wave changesin a 51-year-old male (+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 degree of arterial changes 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). Artertosclerosis was seen chiefly in subjects >50 year of age in both exposed and unexposed groups. It was not marked except in four individuals >70 eeee = oe ee ee eeee ee i ee 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 vascuTable 16 Ophthalmological Findings (% Incidence) Exposed Unexposed Pterygium 23.0 Corneal pigment 12.0 Arcus senilis 38.0 26.0 1.3 8.3 0.7 0.7 Pinguecula 24.0 Corneal scars Phthisis bul bi Nystagmus Strabismus 93.0 1.3 . Aregyll-Robertson pupil 1.3 Cataracts Aphakia Retinal arteriosclerosis Chorioretinal scars ee ee ee eee — we 0.0 4.1 0.0 0.0 2.6 3.9 — 0.0 10.3 11.0 1.3 Macular degeneration Driisen Congenital anomalies 2.6 3.4 19.0 1.3 Vitreous opacities 21.0 22.0 1.3 12.3 0.7 0.0 0.0 0.0