Brief episodes of weakness or collapse are seen fairly frequently in dogs (less so in cats) and present a diagnostic challenge particularly when they are often normal at the time of presentation; this chapter is primarily concerned with this type of case. It has been shown that a diagnosis can be made in approximately 50% of such cases. Of the remaining 50% in which no diagnosis is made, approximately half resolve spontaneously and death or further deterioration are rare outcomes (Cobb & Stepien, 1994).

Table 10.1 provides a list of differential diagnoses for more common causes of episodic weakness and collapse.



   DEFINITIONS
  INVESTIGATION
  CAUSES OF COLLAPSE
  THERAPY

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