Should my literature review PPT include only primary sources?

The short answer is no, you do not need to restrict your presentation exclusively to primary sources, though they should definitely form the backbone of your critical synthesis. In a medical literature review, secondary sources like systematic reviews, meta-analyses, and authoritative clinical guidelines are not just acceptable; they are often necessary for establishing baseline epidemiology, summarizing historical standard-of-care developments, and providing broad clinical context. The primary risk is not that you have included review articles, but rather how you use them. If your attending asks for source documentation on every slide, their goal is usually to assess whether you can distinguish between raw evidence and another author's interpretation, while ensuring your presentation remains completely verifiable and transparent under standard formatting conventions. The nuance comes down to slide purpose and attribution trade-offs. A common misconception among trainees is that citing a review article allows you to bypass reading the original trials it discusses. If you are highlighting a pivotal breakthrough, reporting specific trial endpoints, or discussing adverse event rates, citing a general review article looks sloppy and can hurt your grade because you are relying on a third party's summary rather than the primary data itself. Conversely, using a primary randomized trial just to state the general prevalence of a condition in your background section is inefficient when an established clinical practice guideline or comprehensive consensus statement summarizes that landscape far more reliably. The rule of thumb is simple: use secondary literature to frame the problem and establish consensus, but transition entirely to primary sources once you begin comparing methodologies, analyzing conflicting evidence, or discussing novel mechanistic findings. Consider a hypothetical presentation on managing refractory autoimmune hepatitis. If your opening slide describes the disease's overall diagnostic criteria and standard staging, citing a major clinical society guideline or a landmark review is entirely appropriate. However, if your third slide introduces a novel biological therapy and discusses its phase-two response rates compared to standard therapy, you must cite the original clinical trial, not the review that merely compiled those numbers. When applying APA format on the slides themselves, a clean in-text citation in the corner or footer—such as author and year—suffices to satisfy the rubric without cluttering your visual layout, backed by a complete references slide at the end. Ultimately, you do not need to overhaul your entire slide deck to strip out every secondary citation you have already placed. Instead, audit your presentation slide by slide to confirm that every specific data point, outcome metric, and novel conclusion links back directly to the original investigators who generated it. If you align secondary sources strictly with background framing and rely on primary literature for the core analytical critique, you will comfortably meet the academic rigor your attending expects.