23
ments in those whose statural ranking corre-
sponded with the chronological age ranking.
It might be speculated from these limited observations that these children were exposed to radiation at a particularly vulnerable age and that the
resulting retardation in osseous development led
to failure in statural growth. On the other hand,
it is not possible to exclude completely the possibility that some process unrelated to radiation
damage was responsible for the retardation in
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. In the older groups, arrhythmia
occurred in 3 of [+ exposed individuals and in + of
29 unexposed.
2. Conduction Times.
Few abnormalities were
seen. No individual in either the exposed or the
unexposed group had prolonged auriculoventnc-
ular conduction tirme(P-R interval) above normal.
Several subjects had the shorter conduction time
of 0.12 sec: this is considered normal. The intra-
ventricular conduction time (QRSinterval) was
prolonged in several subjects. In the younger un-
exposed group, the QRS interval was 0.10 to 0.11
sec in one subject, sufficient to be considered right
bundle branch block. In the exposed population
the intraventricular conduction time was pro-
ADULT ABNORMALITIES
longed to 0.12 sec in only one individual, age 81,
who had a marked degree of hypertensive ard
arteriosclerotic cardiovascular disease and cardiac
enlargement. Among 29 individuals in the older
unexposed group, two showed intraventricular
Table {4 is a compilation of the various physical
abnormalities noted in the adult group during the
subjects the intraventricular conduction time
skeletal development.
1959 and 1960 surveys. No abnormalities areincluded for 1960 in the unexposed group because
this group was not examined in the 1960 survey.
This table does not show any significant differ-
ences between the abnormalities noted in the ex-
conduction times of 0.12 sec without the typical
QRScomplex of bundle branch block. In all other
ranged from 0.06 to 0.09 sec in the younger groups
and 0.08 to 0.09 in the older.
3. Electrical Axis Deviation and Electrical Position of the Heart. There were few variations. The
posed and in the unexposed populations. Results
Table 15
of special examinations are discussed below.
CARDIOVASCULAR SURVEY
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
[+ older people 29% showed one or more abnor-
malities. In the unexposed population, among the
younger group 15% had one or more abnor-
[1855913
Abnormality
Rhythm
A-V
[-V
RST
T wave
Unexposed
Age
20-49
Age
250
0
12
21
7
2
2
1+
3
0
7
2
14
(24)*
Q
0
*Number examined.
(1+)
7
21
Age
20-49
(35)
4
il
Age
230
(29)
7
3+
et
were shorter than their vounger sibs. This contrasted with the uniform ranking of all measure-
Electrocardiographic Findings
Mee
urements was noticeable in those children who
malities, and in the older group +1%. Specific
findings maybe summarized asfollows.
ae
22.4 months.
a
To determine whether or not some pattern in
physique characterized these children with retarded osseous development, several physical
measurements (from the 1959 scudv} on them and
on thew sibs were compared (Table 13). These
anthropometric data suggested two trends. First,
the weight rankings correspondedto chronological
age rankings and not to statural rankings. Second,
the lack of synchronyin rankings of several meas-
yes ~ y
ranged from 20 to@Strionths, with an average of