From the Guidelines

The average length of stay of a hospitalized patient with an adverse event is around 4.5 to 16 days, depending on the type of adverse event.

For patients with unruptured intracranial aneurysms treated with endovascular coiling, the average hospital length of stay is 4.5 days 1.
In contrast, patients who develop Clostridioides difficile infection (CDI) have a significantly longer length of stay, with an increase of 8 to 16 days compared to patients without CDI 1.

The type of treatment, such as endovascular coiling or surgical clipping, can impact the length of stay, with coiling resulting in shorter stays 1.
The presence of CDI is a significant predictor of increased length of stay, with a median length of stay of 15 days compared to 8.3 days for matched patients without CDI 1.

These findings highlight the importance of preventing and managing adverse events, such as CDI, to reduce the length of stay and improve patient outcomes.
Clinicians should be aware of the potential for increased length of stay and associated costs when treating patients with adverse events, and take steps to mitigate these risks.

From the Research

The average length of stay for patients with adverse events is not directly stated in the provided studies, but several studies report an increase in length of stay due to adverse events 2, 3, 4, 5, 6.
A study published in the International Journal of Clinical Pharmacy found that patients with adverse drug reactions had a significantly prolonged length of stay (12.4 ± 11.0 days) compared to those without adverse drug reactions (7.3 ± 6.4 days) 4.
A meta-analysis published in the European Journal of Clinical Pharmacology reported a mean difference in hospital stay of 3.98 days (95% CI: 2.91,5.05) for patients with suspected adverse drug reactions compared to those without 5.
Another study published in Mayo Clinic Proceedings found that one adverse event increased the length of stay in the hospital by 8.7 days (95% CI: 3.8-13.7) and in the ICU by 2.4 days (95% CI: 0.6-4.2) 6.

The incidence of adverse events, such as infections, delirium, and falls, can increase the length of stay for hospitalized patients 2, 3, 6.
The type and severity of adverse events, as well as patient risk factors, can also impact the length of stay 3, 4, 5.
Hospital-acquired adverse events, such as those related to medication errors or hospital-acquired infections, can also contribute to increased length of stay 3, 5, 6.