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Related Experiment Videos

Do patients assess rectal bleeding accurately?

R R Simpson1, M L Kennedy, S B Chew

  • 1Colorectal Unit, St George Hospital, Sydney, New South Wales, Australia.

ANZ Journal of Surgery
|December 12, 2001
PubMed
Summary
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Patients and healthcare professionals significantly overestimate small rectal bleeding volumes but underestimate large ones. This perception gap impacts rectal bleeding management and patient assessment accuracy.

Area of Science:

  • Medical Research
  • Clinical Assessment
  • Patient Perception Studies

Background:

  • Accurate assessment of rectal blood loss volume is crucial for patient diagnosis and management.
  • Subjective patient estimations of blood volume passed per rectum are common but their accuracy is not well-established.

Purpose of the Study:

  • To compare subjective visual estimations of blood volumes with known quantities.
  • To evaluate the accuracy of patients', nurses', and doctors' estimations of rectal blood loss.

Main Methods:

  • Thirty participants (10 patients, 10 nurses, 10 doctors) visually estimated four known blood volumes (0.25 mL, 10 mL, 50 mL, 200 mL).
  • Estimations were made in milliliters and by marking a cup to indicate perceived volume.
  • Statistical analysis included Student's t-test and ANOVA for multiple comparisons.

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Main Results:

  • No significant differences in estimation accuracy were found between patient, nurse, and doctor groups.
  • Small to moderate volumes (0.25 mL, 10 mL, 50 mL) were consistently overestimated across all groups.
  • Larger volumes (200 mL) tended to be underestimated by patients and doctors, and to a lesser extent by nurses.

Conclusions:

  • Subjective overestimation of small rectal bleeding volumes and underestimation of large volumes are common.
  • These perceptual inaccuracies may influence clinical decision-making for patients with rectal bleeding.
  • Further research into objective measurement tools for rectal blood loss is warranted.