23
ranged from 20 to™6months, with an average of
22.4 months.
1
To determine whether or not some pattern in
physique characterized these children with retarded osseous development, several physicai
measurements (from the 1959 studv) on them and
on thew sibs were compared (Table 13). These
anthropometric data suggested twotrends. First,
the weight rankings corresponded to chronological
age rankings and not to statural rankings. Second,
the lack of synchrony in rankings of several measurements was noticeable in those children who
were shorter than their younger sibs. This contrasted with the uniform ranking of all measurements in those whose statural ranking corresponded with the chronological age ranking.
It might be speculated from these limited observations that these children were exposed to radia-
tion at a particularly vulnerable age and that the
resulting retardation in osseous developmentled
to failure in statural growth. On the other hand,
it is not possible to exclude completely the pos-
malities, and in the older group 41%. Specific
findings may be summarized asfollows.
Electrocardiographic Findings
1. Rhythm. In the vounger group of exposed
subjects, all had normal rhythm. One abnormality
of rhythm was seen in a member of the younger
unexposed group. [n the older groups, arrhythmia
occurred in 3 of 14 exposed individuals and in 4 of
29 unexposed.
2. Conduction Times. Few abnormalities were
seen. No individual in either the exposed or the
unexposed group had prolonged auriculoventricular conduction time (P-R interval) above normal.
Several] subjects had the shorter conduction time
of 0.12 sec; this is considered normal. The intraventricular conduction time (QRSinterval) was
prolonged in several subjects. Ir, she younger unexposed group, the ORSinterva: was 0.10 to 0.11
sec in one subject, sufficient to be considered right
bundle branch block. In the exposed population
sibility that some process unrelated to radiation
damage was responsible for the retardation in
skeletal development.
the intraventricular conduction time was prolonged to 0.12 sec in only one individual, age 81,
who had a marked degree of hypertensive arfd
arteriosclerotic cardiovascular disease and cardiac
ADULT ABNORMALITIES
unexposed group, two showed intraventricular
Table 14 is a compilation of the various physical
abnormalities noted in the adult group during the
1959 and 1960 surveys. No abnormalities are included for 1960 in the unexposed group because
this group was not examined in the 1960 survey.
subjects the intraventricular conduction time
ranged from 0.06 to 0.09 sec in the younger groups
This table does not showany significant differ-
ences between the abnormaiities noted in the exposed and in the unexposed populations. Results
of special examinationsare discussed below.
CARDIOVASCULAR SURVEY
enlargement. Among 29 individuals in the older
conduction times of 0.12 sec without the typical
QRS complex of bundle branch block. In all other
and 0.08 to 0.09 in the older.
3. Electrical Axis Deviation and Electrical Position of the Heart. ‘There were few variations. The
Table 15
Electrocardiographic Abnormalities
(Percent Incidence in Younger and Older Age Groups)
Exposed
The cardiovascular findings may be found in
the table of physical abnormalities (Table ‘14).
The incidence of various electrocardiographic ab- |
normalities is shown in Table 15. The population
was divided into a younger group, aged 20%
through 49, and an older group, aged 250. In the
exposed population, the younger group of 24
people showed no major abnormalities, but of the
14 older people 29% showed one or more abnor-
malities, [In the unexposed population, among the
younger group 15% had one or more abnor-
Abnormality
Rhythm
A-V
I-V
RST
T wave
Unexposed
Age
Age
Age
Age
20-49
(24)*
350
(14)
20-49
(55)
250
(29)
0
21
2
L4
12
7
?
3
0
0
0
7
7
21
4
2
11
7
14
34
*Number examined.
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