Ddx for weakness + collapse

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  • Weakness + collapse
    • Cardiac
      • Forward failure
        • Outflow tract obstructions
          • Aortic/ pulmonic stenosis
        • Heart failure (systolic dysfunction)
          • DCM
          • MVD
        • Reduced diastolic filling (diastolic dysfunction)
          • Pericardial effusion
      • Dysrhythmias
        • Tachy-dysrhythmias
        • Brady-dysrhythmias
      • Right to left cardiac shunt
        • Teratology of fallot
    • Respiratory
      • Upper airway obstruction
        • Laryngeal paralysis
        • Tracheal collapse
        • Tracheal foreign bodies
      • Severe lower airway/ parenchymal/ pleural space disease
        • Resulting in hypoxaemia
        • Esp. overweight
    • Metabolic
      • Endocrine
        • Addison's
        • Hypo-thyroidism
      • Electrolyte
        • Hypo K
        • Hyper K
        • Hypo Ca
      • Hypogly
      • Hepatic encephal-opathy
    • Neurological
      • CNS
        • Inflammation
        • Neoplasia
        • Idiopathic epilespsy
      • Neuro-muscular
        • Peripheral neuropathy
          • Poly-neuropathy
        • Myopathy
          • Hereditary myopathies
        • Junctiono-pathy
          • Myasthenia gravis
    • Orthopaedic
      • Fractures
      • Dislocations
      • Arthritis
    • Drug related
      • Vasodilators (BP)
      • Glucocorticoids
      • Barbiturates
    • Vasomotor
      • Postural hypotension
        • Rare dogs
      • Carotid sinus syndrome
        • Tight collar stimulating carotid sinus
          • Results in bradycardia
      • Vasovagal reflex
        • Peripheral vascular dysfunction
          • Often associated sudden extreme excitement
      • Syncope associated with
        • Coughing
          • Elevated CSF P reducing cerebral blood flow
        • Swallowing
          • Carotid sinus sensitivity
    • Overweight/ excessive exercise
    • Haematological
      • Anaemia
        • Acute blood loss
          • Sudden collapse/ syncope
        • Chronic anaemia
          • Wekness/ lethargy
          • Pot collapse with exertion

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