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'''Caval syndrome''' is a very severe form of heartworm disease that can occur in dogs and cats. It is characterised by respiratory distress, signs of right-sided heart failuer, intravascular haemolysis and haemoglobinuria. Disseminated intravascular coagulation frequently occurs, and the syndrome is often fatal.
'''Caval syndrome''' is a very severe form of heartworm disease that can occur in dogs and cats. It is characterised by respiratory distress, signs of right-sided heart failure, intravascular haemolysis and haemoglobinuria. Disseminated intravascular coagulation frequently occurs, and the syndrome is often fatal.
In cats, most infections are asymptomatic. However, sudden death can occasionally occur. This may be preceded by an acute respiratory crisis, thought to be due to parasitic thromboembolism and obstruction of a major pulmonary artery<sup>1, 2</sup>. When clinical signs are less acute, they are vague and may include anorexia, weight loss and lethargy. Intermittent coughing and dyspnoea can appear similar to feline asthma. Syncope may also occur, and cats may vomit. The cause of this vomiting is undetermined<sup>3</sup>.
In cats, most infections are asymptomatic. However, sudden death can occasionally occur. This may be preceded by an acute respiratory crisis, thought to be due to parasitic thromboembolism and obstruction of a major pulmonary artery<sup>1, 2</sup>. When clinical signs are less acute, they are vague and may include anorexia, weight loss and lethargy. Intermittent coughing and dyspnoea can appear similar to feline asthma. Syncope may also occur, and cats may vomit. The cause of this vomiting is undetermined<sup>3</sup>.