ClinQuiry — Clinical Research, Taught in Sequence

Core summary

A narrative review is an expert-authored summary of a topic, drawing on selected literature to provide a broad overview. Unlike systematic reviews, it does not follow a predefined search protocol, making it useful for broad topics but vulnerable to author bias.

Detailed explanation

Narrative reviews (also called traditional or non-systematic reviews) provide a comprehensive discussion of a topic by an expert who selects, synthesizes, and interprets the relevant literature. The author chooses which studies to include based on their judgment — there is no systematic search strategy, no predefined inclusion criteria, and no formal quality assessment. This makes narrative reviews valuable for: providing a broad introduction to a new topic, synthesizing knowledge across disciplines, generating hypotheses, and educating readers on complex subjects. However, they have important limitations: the study selection is subjective and potentially biased, the methods are not reproducible, and the conclusions may reflect the author's pre-existing views rather than the totality of evidence. Narrative reviews are common in clinical journals as invited reviews, update articles, and educational pieces. They should not be used to make definitive claims about treatment effectiveness — that requires a systematic review.

Clinical example

A professor writes an invited review titled 'Advances in Managing Diabetic Neuropathy' for a journal. She discusses pathophysiology, diagnosis, and treatment options, selecting landmark studies and recent findings she considers most relevant. This provides an excellent educational overview but may not capture every published trial.

Research example

Many 'State of the Art' and 'Clinical Update' articles in journals like the New England Journal of Medicine and The Lancet are narrative reviews. They are written by leading experts and serve as educational resources that contextualize new evidence within the broader field.

Knowledge check

Q1. What is a key limitation of narrative reviews?

Q2. When is a narrative review most appropriate?

Q3. How does a narrative review differ from a systematic review?