75 year old fit female has not had a bowel movement in ten days; she has been

It may pose health risks for a 75-year-old female with ten days of constipation undergoing standard bowel preparation for colonoscopy without prior careful assessment. Elderly patients are at higher risk of clinically significant fluid and electrolyte abnormalities during bowel cleansing preparations, especially if they have constipation symptoms or comorbidities, even if otherwise considered healthy SmPC Picolax.

Prolonged constipation, such as ten days without bowel movement, raises concerns about faecal loading or impaction, which can contribute to serious adverse events like bowel obstruction during bowel preparation NICE CKS,Tadano et al. 2025. Such obstruction is the most commonly reported serious adverse event related to bowel prep in elderly patients and can lead to bowel perforation, ischemic colitis, and in rare cases death Tadano et al. 2025.

UK guidelines recommend assessing for red flag symptoms and signs to exclude serious underlying causes or bowel obstruction before initiating bowel preparation NICE CKS. Constipation lasting over a week warrants evaluation for faecal loading, and treatment of impaction if present, before proceeding to bowel preparation NICE CKS. Elderly patients require particular attention to fluid and electrolyte balance, as bowel cleansers can cause severe disturbances leading to seizures, coma, or cardiac arrhythmias SmPC Picolax,SmPC MOVIPREP,SmPC KLEAN.

Bowel preparations containing PEG, sodium picosulfate, or macrogol are commonly used and indicated in adults including the elderly but must be used with caution in those who are fragile or have risk factors such as constipation for many days SmPC CitraFleet,SmPC MOVIPREP,SmPC KLEAN. Close monitoring of hydration status and electrolytes, and limiting bowel cleansing duration to under 24 hours is advised SmPC Picolax. Overly prolonged preparation increases risk of adverse events SmPC Picolax.

Recent Japanese systematic review data show serious adverse events from bowel preparation are more frequent in patients aged 70 and over and in those with constipation or abdominal symptoms, even if considered healthy otherwise, due to susceptibility to bowel obstruction and ischemic colitis Tadano et al. 2025. Elderly patients with constipation are at increased risk of electrolyte abnormalities, including hyponatremia and hypermagnesemia, which may be precipitated by bowel prep agents Tadano et al. 2025.

Given the above, it is prudent to first assess and manage constipation appropriately, excluding faecal impaction or obstruction, and optimize hydration and electrolyte status before standard bowel preparation is administered to a 75-year-old woman with ten days of constipation prior to colonoscopy NICE CKS,Tadano et al. 2025.

In terms of patient education, enhanced instruction has been shown to improve bowel preparation quality and may reduce risks associated with poor prep Ganayem et al. 2025. However, in the context of significant constipation, education alone is insufficient without addressing the underlying bowel status first.

In conclusion, standard bowel preparation in a 75-year-old patient with prolonged constipation is potentially unsafe without prior evaluation and management of constipation and careful monitoring. Individualized risk assessment and possibly alternative or modified bowel preparation strategies are recommended SmPC Picolax,NICE CKS,SmPC CitraFleet,SmPC MOVIPREP,SmPC KLEAN,Tadano et al. 2025.