6.4 Past Medical History, Medications, and Baseline Function

What Changed From Baseline

Past medical history can make a confusing scene clear, but it can also become a time sink. The EMR needs enough history to understand risk and spot time-sensitive problems, not a complete medical biography. The guiding question is: what changed from this patient's baseline today?

Baseline function is the patient's normal state - normal mental status, mobility, speech, and breathing for them. ' Baseline matters most in patients who are not their own historians: the elderly with dementia, people with developmental disabilities, and the very young. A caregiver who says a nonverbal patient 'usually smiles and tracks people but today is limp and staring' has just handed you the most important finding on the call - an acute change from baseline that demands urgent evaluation and transport.

Without that baseline, the limp, staring presentation might be mistaken for the patient's normal and dangerously under-triaged. *

High-Value Medication Clues

Medications are a shortcut to a patient's hidden medical history. Certain classes carry outsized importance for the EMR because they reveal a diagnosis or change the risk picture:

Reading medications backward into a diagnosis is a powerful field skill. A patient who cannot tell you their history but carries an inhaler, insulin, and a nitroglycerin bottle has just told you they live with respiratory disease, diabetes, and heart disease. Worked example: an older adult falls and strikes the head. If a list or container shows an anticoagulant, the EMR should treat the patient as high risk for intracranial bleeding even if they look fine at first, expedite transport, and clearly report the blood-thinner use at handoff.

That single medication can change a 'minor fall' into a potential time-critical bleed - the kind of detail that genuinely alters outcomes.

Gathering History You Cannot Ask For

When the patient is unresponsive, confused, or very young, the EMR builds the history from the scene rather than from the patient:

• Medication containers - photograph them or bring them along; they reveal diagnoses and dosing.
• Medical-alert jewelry and wallet cards - these flag allergies, diabetes, anticoagulation, or conditions like epilepsy.
• Caregivers and family - the source of baseline function and the timeline of events.
• Facility paperwork - transfer forms and medication administration records in nursing and care settings.

For a patient with altered mental status, the EMR should collect the medication containers and bring them with the patient (or relay an accurate list) so the receiving providers know what the patient takes and what they may have taken - an overdose, an interaction, or a missed dose may be the cause. Note that gathering containers is for information; administering a patient's own medication is outside the EMR scope except for the narrow, protocol-driven assists allowed at this level.

Two cautions are tested repeatedly. First, history must stay relevant: the focus is what bears on today's emergency, not a recitation of every old diagnosis. Second, history must never delay urgent care - you do not pause hemorrhage control or ventilation to read pill bottles. Past history sets context; the primary assessment and treatment still come first. Good history reaches its real value only when it is handed off cleanly to the next level of care, where it can shape decisions the EMR cannot make alone.

Turning History Into a Risk Picture

The purpose of history at the EMR level is to build a quick risk picture: who is this patient, what conditions do they carry, and what changed today? That picture guides priority and transport even when the EMR cannot deliver definitive treatment. A diabetic patient with altered mental status, a cardiac patient with chest pain, or an anticoagulated patient after a head strike each moves up the priority list because the history reveals a plausible serious cause. History does not replace the physical findings and vital signs - it frames them.

On the exam, the strongest answers use history to change priority or handoff, while weak answers either ignore a high-value clue or treat history as more important than the patient's current condition. Two principles keep candidates on track. First, a new change always outranks a chronic finding: a patient who is acutely worse than their baseline needs urgent attention regardless of how many chronic diagnoses they carry.

Second, relevance beats completeness: a tight, pertinent history that names the blood thinner, the diabetes, and the cardiac history is worth more than an exhaustive list that buries those facts. The EMR's job is to surface the few history items that the next provider must know, capture them accurately - including times where they matter - and carry them forward into a clear handoff.