4 Journal of Feline Medicine and Surgery 0(0)
low SBP values (ie, -10.8 ± 11.3 mmHg), suggesting
HDO slightly overestimated SBP compared with telemetry during hypotensive conditions. Nevertheless, in the
low SBP subgroup, the 95% limit of agreement was the
narrowest and all paired values were within 10 mmHg
(Table 2), supporting a very good correspondence
between the two methods.
Overall, the percentages of paired SBP measurements
lying within a difference of less than 10 and 20 mmHg
between the two methods was 88 ± 3% and 96 ± 2%,
respectively. A higher discrepancy was found at the high
SBP levels, specifically for the 10 mmHg difference.
When comparing DBP individual values collected
using the HDO and the telemetry methods, the CCs of the
paired measurements between the two methods were between 0.73 and 0.86 individually, with a mean CC of
0.81 ± 0.02, suggesting a lower correlation between the
two methods for DBP measurement compared with SBP.
When evaluated on data in three subgroups of pressure
level, the CC was dramatically reduced owing, most likely,
to the limited number of observations and limited distribution of
values within each pressure range (Table 1). The
bias between the two methods was 22.3 ± 1.6 mmHg, indicating that HDO measurement
of DBP tended to produce
lower values than the telemetry devices. Likewise, the
limit of agreement between the two methods for DBP
measurement was 22.6 ± 1.9 mmHg. The percentages of
paired measurements lying within 10 or 20 mmHg, were
3-27% and 16-56%, respectively, confirming the discrepancy between the two methods for DBP
measurement.
Figure 1 Linear regression between systolic blood pressure (SBP) and diastolic blood pressure values measured with highdefinition oscillometry
(HDO) and telemetry in an individual animal, cat number 2008024. SBP correlation coefficient r = 0.98;
DBP correlation coefficient r = 0.86