In the OPQRSTI assessment model, what does the letter O represent?

In the OPQRSTI assessment model, the letter "O" represents "Onset." This refers to when the patient's symptoms began, which is a crucial aspect of assessing the patient's condition. Understanding the onset helps the healthcare provider determine the nature of the problem, establish a timeline for the symptoms, and evaluate whether the condition may be acute or chronic.

Including the onset in the assessment aids in prioritizing care and may influence the diagnosis and treatment options. For example, knowing whether a pain started suddenly or gradually can give valuable insights into its possible causes, leading to appropriate interventions.