Prehospital Academy Lesson 41.3
Medical Emergencies in the Elderly
Geriatric medicine requires an understanding of "atypical presentations" where the body's diminished physiological reserve masks traditional symptoms of crisis. This lecture focuses on the complexities of polypharmacy, the subtle signs of acute cardiac events, and the critical distinction between chronic dementia and acute delirium.
The GEMS Diamond: A Geriatric Framework
To ensure a comprehensive assessment, EMTs should utilize the GEMS Diamond:
G - Geriatric Patient: Recognizing that the patient is at a different physiological baseline (e.g., lower resting heart rate, lower temp).
E - Environmental Assessment: Is the home too hot or too cold? Are there trip hazards or signs of neglect? This provides clues to the patient's ability to perform Activities of Daily Living (ADLs).
M - Medical Assessment: A deep dive into chronic conditions and medications.
S - Social Assessment: Does the patient have a support system? Are they isolated? Social isolation is a significant predictor of mortality in the elderly.
Polypharmacy and the Beers Criteria
Polypharmacy is the concurrent use of multiple medications by a single patient. In the elderly, reduced renal clearance (as measured by the Cockcroft-Gault formula) and hepatic metabolism lead to drug accumulation. The Beers Criteria is a formal list of medications that are "potentially inappropriate" for the elderly due to high risks of falls, confusion, or GI bleeds. Common culprits include benzodiazepines, certain NSAIDs, and first-generation antihistamines (e.g., Diphenhydramine).
Cardiovascular Complexity: HFpEF and Silent MI
The aging heart undergoes fibrosis and stiffening, leading to significant changes in how heart failure presents.
HFpEF (Heart Failure with Preserved Ejection Fraction): Also known as "diastolic heart failure." The heart can pump effectively (normal EF), but it cannot relax enough to fill. These patients present with pulmonary edema despite having a "strong" heart on prior medical records.
Silent Myocardial Infarction: Up to one-third of elderly patients do not report chest pain during an MI. Instead, they present with Anginal Equivalents: sudden-onset dyspnea, unexplained diaphoresis, or acute syncope.
Aortic Stenosis: A common age-related valvular disease that can lead to exertional syncope. Any geriatric patient who faints while active should be suspected of having a cardiac output failure until proven otherwise.
Neurocognitive Emergencies: Dementia vs. Delirium
The EMT must differentiate between a chronic decline and an acute medical crisis.
Delirium (Acute Brain Failure)
Delirium is a sudden, fluctuating change in mental status. It is not a normal part of aging; it is a medical emergency. In the elderly, delirium is often the only symptom of a urinary tract infection (UTI), sepsis, or a silent MI. Key Rule: Any new-onset confusion is delirium until proven otherwise.
Major Neurocognitive Disorders (Dementia)
Chronic conditions like Alzheimer's or Lewy Body Dementia involve a slow, progressive loss of memory and executive function. Clinical Pearl: Patients with Lewy Body Dementia often have visual hallucinations and are hyper-sensitive to antipsychotic medications (like Haloperidol), which can cause fatal neuroleptic malignant syndrome.
Sensory and Autonomic Neuropathy
The aging process affects the nervous system's ability to detect and respond to internal and external stimuli.
Reduced Chemoreceptor Sensitivity: The elderly do not respond as vigorously to hypoxia or hypercapnia. Their respiratory rate may remain relatively low even in respiratory failure.
Autonomic Neuropathy: Common in diabetics, this prevents the "fight or flight" response to hypoglycemia. A patient may become unconscious from low blood sugar without ever exhibiting the "shaky and sweaty" signs.
Pain Masking: Due to sensory decline, an elderly patient may have a hip fracture or a perforated ulcer but report only "mild discomfort."
Critical Thinking Questions
Explain why a 12-lead ECG is mandatory for an 80-year-old patient complaining only of "general weakness and fatigue."
How does the **GEMS Diamond** help an EMT identify potential elder abuse or neglect that might be missed in a purely medical assessment?
Why is it a clinical error to assume that a confused elderly patient "just has dementia" without checking their temperature and blood glucose?
Describe the pathophysiology of **HFpEF**. How can a patient have a normal ejection fraction but still be in severe congestive heart failure?
Explain the relationship between **reduced renal clearance** and the high incidence of adverse drug reactions in patients over the age of 75.