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The anaesthetic records of 1525 dogs were examined to determine the prevalence of postanaesthetic hypothermia, its clinical predictors and consequences. Temperature was recorded throughout the anaesthesia. At the end of the procedure, details coded in were: hyperthermia (>39.50°C), normothermia (38.50°C-39.50°C), slight (38.49°C-36.50°C), moderate (36.49°C-34.00°C) and severe hypothermia (<34.00°C). Statistical analysis consisted of multiple regression to identify the factors that are associated with the temperature at the end of the procedure. Before premedication, the temperature was 38.7 ± 0.6°C (mean ± sd). At 60, 120 and 180 minutes from induction, the temperature was 36.7 ± 1.3°C, 36.1 ± 1.4°C and 35.8 ± 1.5°C, respectively. The prevalence of hypothermia was: slight, 51.5 per cent (95 per cent CI 49.0 to 54.0 per cent); moderate, 29.3 per cent (27.1-31.7 per cent) and severe: 2.8% (2.0-3.7%). The variables that associated with a decrease in the temperature recorded at the end of the anaesthesia were: duration of the preanesthetic time, duration of the anaesthesia, physical condition (ASA III and ASA IV dogs showed lower temperatures than ASA I dogs), the reason for anaesthesia (anaesthesia for diagnostic procedures or thoracic surgery reduce the temperature when compared with minor procedures), and the recumbency during the procedure (sternal and dorsal recumbencies showed lower temperatures than lateral recumbency). The temperature before premedication and the body surface (BS) were associated with a higher temperature at the end of the anaesthesia, and would be considered as protective factors.

This paper describes the cardiorespiratory variables and the incidence of anaesthetic complications in dogs. For this, a retrospective study of 1281 anaesthesias was performed. Heart rate (HR), non-invasive mean arterial (MAP), systolic (SP) and diastolic pressures (DP), invasive mean arterial (IMAP), systolic (ISP) and diastolic pressures (IDP), central venous pressure (CVP), respiratory rate (RR), tidal volume (V(T)), minute volume (V(M)), end-tidal CO(2) (EtCO(2)), arterial oxygen saturation (SpO(2)), temperature (T) and death are reported. Data were described both globally and separately for each ASA (American Society of Anaesthesiologists classification) status. An ANOVA and a Tukey's test were used for comparing the different ASA status' values (alpha=0.05). During anaesthetic maintenance, the mean +/- SD of the studied variables were: HR: 91+/-27 bpm. MAP: 86+/-24 mmHg. IMAP: 80+/-22 mmHg. SP: 114+/-25 mmHg. ISP: 109+/-26 mmHg. DP: 67+/-23 mmHg. IDP: 66+/-22 mmHg. CVP: 5+/-3 mmHg. RR: 19+/-11 rpm. V(T): 14+/-7 ml/kg. V(M): 191+/-93 ml/kg/min. EtCO(2): 40+/-8 mmHg. T: 37.1+/-1.7 degrees C. ASA III and ASA IV patients, compared with those with ASA I, showed higher values of HR, RR, V(T) and V(M) and lower in IMAP, CVP, EtCO(2), SpO(2) and T. The most frequent complications were bradycardia (36.3% of the patients), hypotension (37.9%), hypoventilation (63.4%), hypoxia (16.4%), hypothermia (4.8%) and death (0.9%). Cardiorespiratory complications frequently occur in dogs during general anaesthesia.