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Time Completed: 01:08:33

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97

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Pharmacology

Musculoskeletal

Question 109 of 180

A 69 year old man presents to hospital with an acutely painful, red, hot swollen big toe. He has a past medical history of gout, diabetes mellitus and severe heart failure. Gout is diagnosed. Which of the following is the drug of choice in this patient:

Answer:

NSAIDs are contraindicated in this patient due to his severe heart failure. Colchicine is a useful alternative in patients in whom NSAIDs are contraindicated, not tolerated or ineffective. Although its use is limited by toxicity at higher doses, it is useful in patients with heart failure or those taking anticoagulants. The dose is 500 micrograms 2 - 4 times a day until the symptoms are relieved or diarrhoea or vomiting occurs (max 6 mg per course and do not repeat treatment within 3 days).

Management of Gout

Gout is a disorder of purine metabolism characterised by a raised uric acid level in the blood (hyperuricaemia) and the deposition of urate crystals in joints and other tissues, such as soft connective tissues or the urinary tract.

NSAIDs

Acute attacks of gout are usually treated with an NSAID such as diclofenac, indometacin, or naproxen. Treatment should be started as soon as possible and continued until 48 hours after the attack has resolved. A PPI should be co-prescribed for gastric protection in people at high risk of gastrointestinal adverse events.

Colchicine

Colchicine is an alternative in patients in whom NSAIDs are contraindicated, not tolerated or ineffective. Although its use is limited by toxicity at higher doses, it is useful in patients with heart failure or those taking anticoagulants.

The dose is 500 micrograms 2 - 4 times a day until the symptoms are relieved or diarrhoea or vomiting occurs (max 6 mg per course and do not repeat treatment within 3 days).

Colchicine should be avoided in people with blood dyscrasias and bone marrow disease.

Common side effects of colchicine include:

  • abdominal pain
  • nausea and vomiting
  • diarrhoea

Side effects are dose dependent and may be severe enough to limit treatment.

Corticosteroids

Oral or parenteral corticosteroids are an effective alternative in those who cannot tolerate or who are resistant to NSAIDs and colchicine. Intra-articular injection of a corticosteroid can be used occasionally in acute monoarticular gout.

Allopurinol

Allopurinol is not effective in treating an acute attack and may prolong it indefinitely if started during the acute episode, but should be continued during an acute attack if the patient is already established on long term therapy.

Long term treatment (prevention) of gout may be indicated in patients with frequent recurrence of acute attacks of gout, the presence of tophi, or signs of chronic gouty arthritis. Allopurinol reduces uric acid formation from purines and may be used to prevent further attacks of gout by correcting hyperuricaemia. The initiation of treatment may precipitate an acute attack, and should be covered with an NSAID or colchicine, continued for at least one month after the hyperuricaemia has been corrected.

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  • Biochemistry
  • Blood Gases
  • Haematology
Biochemistry Normal Value
Sodium 135 – 145 mmol/l
Potassium 3.0 – 4.5 mmol/l
Urea 2.5 – 7.5 mmol/l
Glucose 3.5 – 5.0 mmol/l
Creatinine 35 – 135 μmol/l
Alanine Aminotransferase (ALT) 5 – 35 U/l
Gamma-glutamyl Transferase (GGT) < 65 U/l
Alkaline Phosphatase (ALP) 30 – 135 U/l
Aspartate Aminotransferase (AST) < 40 U/l
Total Protein 60 – 80 g/l
Albumin 35 – 50 g/l
Globulin 2.4 – 3.5 g/dl
Amylase < 70 U/l
Total Bilirubin 3 – 17 μmol/l
Calcium 2.1 – 2.5 mmol/l
Chloride 95 – 105 mmol/l
Phosphate 0.8 – 1.4 mmol/l
Haematology Normal Value
Haemoglobin 11.5 – 16.6 g/dl
White Blood Cells 4.0 – 11.0 x 109/l
Platelets 150 – 450 x 109/l
MCV 80 – 96 fl
MCHC 32 – 36 g/dl
Neutrophils 2.0 – 7.5 x 109/l
Lymphocytes 1.5 – 4.0 x 109/l
Monocytes 0.3 – 1.0 x 109/l
Eosinophils 0.1 – 0.5 x 109/l
Basophils < 0.2 x 109/l
Reticulocytes < 2%
Haematocrit 0.35 – 0.49
Red Cell Distribution Width 11 – 15%
Blood Gases Normal Value
pH 7.35 – 7.45
pO2 11 – 14 kPa
pCO2 4.5 – 6.0 kPa
Base Excess -2 – +2 mmol/l
Bicarbonate 24 – 30 mmol/l
Lactate < 2 mmol/l

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