Wednesday, January 4, 2023

BNF Case Study: Crohn's disease

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Mrs Fisher is diagnosed with an acute relapse of her Crohn's disease. She comes back to your pharmacy the next day and with a prescription for prednisolone immediate-release tablets 20mg daily, followed by reducing doses until remission. Crohn's disease is a chronic, inflammatory bowel disease that mainly affects the gastro-intestinal tract. Crohn's disease may present as recurrent attacks, with acute exacerbations combined with periods of remission or less active disease. Symptoms depend on the site of disease but may include abdominal pain, diarrhoea, fever, weight loss and rectal bleeding. Subsequent doses of hydrocortisone, for example the midday dose, should be given intravenously in hospital.

The specialist will highlight if there is any need for any further titration. Dosing will be in line with the BNF/SPC or outlined in the letter from the specialist. A brief prescribing document may be available otherwise this will just link to a standard document that outlines the responsibilities of the specialist, primary care prescriber and patient. All patients on these should still be regularly reviewed in primary care regarding their treatment.

Early action can help stop problems from developing into more serious difficulties. Steroids can cause thinning of the skin, which can make you bruise more easily than usual – this is further increased if you have thrombocytopenia. They can also make your skin more oily, which can cause spots – this is more common on the face, back and chest, and in younger people. Steroids can affect the speed at which your body breaks down food to get energy from it . This can increase your hunger levels, leading you to eat more and to gain weight. If your metabolism slows down, you might gain weight, even if your appetite doesn’t increase.

Fostair was not bioequivalent to a free combination of extrafine beclometasone dipropionate and formoterol if administered to asthmatic adolescents aged 12 to 17 years in a single dose pharmacokinetic study (4 actuations of 100/6 micrograms). This result was independent of whether a spacer (Aerochamber Plus®) was used or not. The systemic exposure to the active substances beclometasone dipropionate and formoterol in the fixed combination Fostair have been compared to the single components. Acute inhalation of beclometasone dipropionate doses in excess of those recommended may lead to temporary suppression of adrenal function. This does not need emergency action as adrenal function recovers in a few days, as verified by plasma cortisol measurements. In these patients treatment should be continued at a dose sufficient to control asthma.

If this happens and you stop taking steroids suddenly, it can lead to a lack of the steroid hormone cortisol within your body. This is known as adrenal crisis, or secondary adrenal insufficiency. It is more likely to happen with steroids taken by mouth than with other types of steroids. As beclometasone dipropionate or its metabolites were not traced in the urine, an increase in systemic exposure is not envisaged in patients with renal impairment. Inhaled beclometasone dipropionate is rapidly absorbed through the lungs; prior to absorption there is extensive conversion to its active metabolite beclometasone-17-monopropionate via esterase enzymes that are found in most tissues.

Therefore blood glucose should be closely monitored in patients with diabetes. Fostair inhaler is provided with a counter on the back of the actuator, which shows how many doses are left. For the 120 doses presentation each time the patient presses the canister, a puff of medicine is released and the counter counts down by one. For the 180 presentation, each time the patient presses the canister the counter rotates by a small amount and the number of puffs remaining is displayed in intervals of 20. Patients should be advised not to to drop the inhaler as this may cause the counter to count down.

If possible, the parents should be contacted prior to surgery to let them know how to manage their child’s steroids at this time . It is recommended that anyone who has completed a prolonged course of steroids within the last 12 months and has had further short courses of steroids should be considered at risk of AS . The supporting prescribing guideline must have been agreed by the relevant secondary care trust D&TC and approved by the Nottinghamshire APC. A supporting prescribing guideline may be requested which must have been agreed by the relevant secondary care trust DTCs and approved by the Nottinghamshire APC. Whether you develop them depends on factors including the dose and how long you take them for.

The renal excretion of beclometasone dipropionate and its metabolites is negligible. The terminal elimination half-lives are 0.5 h and 2.7 h for beclometasone dipropionate and beclometasone-17-monopropionate respectively. There is an elevated risk of arrhythmias in patients receiving concomitant anaesthesia with halogenated hydrocarbons.

When you ask about her symptoms she explains she's had diarrhoea for two days, with some abdominal pain and she's been feeling quite tired lately. She leads a busy lifestyle, holding down two jobs and has had some recent weight loss which she attributes to stress and poor nutrition. Previously she had been diagnosed with Crohn's disease but this has been in remission for the last couple of years without the need for medication. Mrs Fisher is on no current medications but she is a regular smoker.

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