6 Journal of Feline Medicine and Surgery 0(0)
but when BP is slightly increased and thus associated
with a low risk of TOD or in the acute phase of greater
BP increases, TOD is absent. In this situation the diagnosis of hypertension requires
reliable BP measurements.
A reliable measurement of BP in cats must overcome
at least two potential sources of error. First, potential bias
in data interpretation can occur in conscious subjects
owing to the 'white coat effect', which is a pseudonym
Figure 3 Bland-Altman plot of agreement between systolic blood pressure (SBP) and diastolic blood pressure (DBP) measured
with high-definition oscillometry (HDO) and telemetry in cat number 2008018 according to subgroups (A = high; B = normal; C
= low). Mean difference (bias): - -- - -- - -- -, low limit of agreement (-2 SD) and high limit of agreement (+ 2 SD): - - - - - - -.
SBP high, normal, low: bias: 3.9, -4.6, -14.8 mmHg; limits of agreement: ± 14.6, ± 19.5, ± 10.3 mmHg; percentage of paired
measurements lying within a difference between the two methods less than 10 mmHg: 69, 93, 100%; <20 mmHg: 100, 100,
100%. DBP high, normal, low: bias: 31.1, 20.7, 9.6 mmHg; limits of agreement: ± 27.6, ± 17.6, 14.4 mmHg; percentage of paired
measurements lying within a difference between the two methods less than 10 mmHg: 14, 7, 100%; <20 mmHg: 14, 40, 80%