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Hyperthyroidism is reported to cause pyrexia of unknown origin. In one study, 19% of hyperthyroid cats had an increased body temperature, however we rarely observe increased rectal temperature (RT) in our hyperthyroid cats. The aims of this study were to document the RT of hyperthyroid cats preand post-treatment and compare their median RT and the proportion of hyperthermic/pyrexic cats to a control population. A further aim was to investigate the correlation between RT and total T4. Data from cats presented to a veterinary teaching hospital between 1/1/2010 and 1/10/2015 were reviewed. Pretreatment hyperthyroid cats were included if total T4 >50 nmol/l and a RT measured within +/–6 days were recorded. Post-treatment cases were included if, following management, total T4 <50 nmol/L and a RT was recorded within +/–6 days. A control group consisted of cats with the subsequent case number, a recorded RT and no record of hyperthyroidism. Kolmogirov-Smirnov tests of normality were performed and Pearson’s correlation, Z-test and Mann-Whitney U tests were performed when appropriate. p<0.05 was considered significant. The median total T4 of 117 cats with uncontrolled hyperthyroidism was 185 nmol/L (range: 50.3–990 nmol/L). Their median RT 38.2°C (range: 36.9–40.1°C). Seven (5.98%) were hyperthermic/pyrexic (RT>39.2°C). There was no correlation between RT and total T4 (Pearson’s correlation coefficient 0.018, p=0.85). Twenty six of these cats had an RT recorded when they were no longer hyperthyroid (total T4<50nmol/L). The median RT at this time was 37.8°C (range: 36.7–38.9°C) which was a median of 0.5°C (range: –1.3 to +1.6°C) lower than their RT pre-treatment (p=0.003). The median temperature of the 70 cats in the control group was 38.4°C (range: 33.0–40.6°C). This was not significantly different to the median RT of the hyperthyroid cats pre-treatment (p=0.66). Seven (10.00%) of the control cats were hyperthermic/pyrexic which was not significantly different to the proportion of hyperthermic/pyrexic cats in the pre-treatment hyperthyroid group. Six percent of hyperthyroid cats had hyperthermia/pyrexia pre-treatment which was no different to the proportion in our control population. The hyperthyroid cat’s pre-treatment RTs were not correlated with total T4. Following successful treatment, there was a significant reduction in RT. This suggests that high total T4 may increase the cat’s RT but it rarely results in temperatures above the normal range and other causes of pyrexia/hyperthermia should be sought in these cats.

british small animal veterinary association ebooks

The Diabetic Clinical Score (DCS): evaluation of a simple standardised quantification tool to allow rapid description of clinical signs in diabetic cats