Constipation Risk Factors and Pathophysiology

Advanced age is a significant risk factor for constipation, with elderly individuals being five times more prone to constipation than younger people 2
Opioid analgesics cause constipation with no development of tolerance over time 3
The American College of Physicians recommends considering alternative medications to opioids to reduce the risk of constipation 3
5-HT3 receptor antagonist antiemetics slow colonic transit and increase fluid absorption, contributing to constipation 3
Vinca alkaloids cause neuropathic effects that prolong gastrointestinal transit time, leading to constipation 3

Lifestyle, Dietary, and Environmental Risk Factors

Lack of privacy when toileting is a risk factor for constipation 2
Inadequate fluid intake and low-fiber diet contribute to constipation risk, although specific data is not available in this context

Hypercalcemia, hypokalemia, uremia, and abdominal or pelvic masses are associated with an increased risk of constipation 2
Radiation fibrosis is a risk factor for constipation in patients with a history of radiation therapy 2

Cancer patients have a high prevalence of constipation, ranging from 40% to 90%, due to cancer treatments, pain management with opioids, and other factors 2
Thalidomide treatment is associated with a high risk of constipation, which is the second most common adverse effect after sedation 4
Elderly patients have a prevalence of constipation ranging from 24% to 50%, with specific risk factors including polypharmacy, reduced mobility, and diminished perception of rectal distension 2, 5

Disruption of normal colonic motility, excessive dryness of fecal content, diminished perception of rectal distension, and dysfunction of the rectal sphincter contribute to constipation 2
Prolonged colonic transit time, exceeding the normal range of 20-72 hours, is a key mechanism underlying constipation 2