For pediatric BLS with two rescuers, current AHA Guidelines (2020) recommend:
Two-thumb encircling hands technique: Most effective for infants; provides consistent depth and control.
Compression ratio of 15:2: Enhances ventilation without compromising perfusion.
Compression depth: 1/3 of chest or approximately one-half the chest ' s depth.
CPR begins if pulse < 60 bpm with signs of poor perfusion, not at 72 bpm. Rate of 180/min is excessive; ideal rate is 100-120/min.
References:
AHA BLS Provider Manual (2020) - Pediatric BLS Section
NREMT Cardiology and Resuscitation Module
Pediatric Advanced Life Support (PALS) Guidelines

This is the kind of patient where EMTs should think beyond the absence of chest pain. In women, a myocardial infarction can present with less classic symptoms such as shortness of breath, dizziness
/lightheadedness, and unusual weakness or fatigue . The American Heart Association specifically notes that women may have heart attack symptoms including shortness of breath and unusual tiredness and weakness , and the American Diabetes Association also lists shortness of breath and dizziness or lightheadedness among symptoms of heart disease that people with diabetes should recognize. ( www.heart.
org )
So from an NREMT-style assessment standpoint, a 56-year-old woman with diabetes and a sudden onset of these symptoms should be treated with a high index of suspicion for acute myocardial infarction until proven otherwise. ( www.heart.org )

The correct answer is D. Muscle cramps.
Hemodialysis is a process that removes waste products and excess fluid from the blood in patients with kidney failure. During this process, rapid shifts in fluid and electrolytes can lead to several complications.
One of the most common adverse effects during hemodialysis is muscle cramps, which are primarily caused by:
Rapid fluid removal (hypovolemia)
Electrolyte imbalances
Changes in osmolarity
Why D is correct:
NREMT-based medical guidelines highlight that:
"Patients undergoing dialysis commonly experience complications such as hypotension and muscle cramping." Muscle cramps are frequently reported during or immediately after dialysis due to fluid shifts.
Why the other options are incorrect:
A). Tinnitus: Not associated with dialysis treatment.
B). Gallstones: A chronic condition unrelated to dialysis sessions.
C). Hypertension: While kidney patients may have hypertension, dialysis more commonly causes hypotension, not hypertension, during treatment.
Exact Extracts:
"Complications of dialysis include hypotension and muscle cramps."
"Rapid fluid shifts during dialysis can result in painful muscle cramping."
"Dialysis patients may experience electrolyte imbalances leading to neuromuscular symptoms." References:
NREMT EMT Education Standards - Medical Emergencies (Renal and Urologic Conditions) NREMT National Continued Competency Program (NCCP) - Medical Content Prehospital Emergency Care (EMT) - Renal Emergencies

The correct answer is A. Atherosclerosis.
This patient is experiencing positional (orthostatic) symptoms, including:
Dizziness / feeling faint
Blurred vision
Symptoms that occur when standing and resolve at rest
In elderly patients, this pattern strongly suggests reduced cerebral perfusion upon standing, often due to vascular insufficiency from atherosclerosis.
Key reasoning:
Atherosclerosis causes narrowing and stiffening of arteries.
This limits the body's ability to quickly adjust blood flow during position changes.
As a result, transient cerebral hypoperfusion occurs when standing, causing the described symptoms.
Why A is correct:
It best explains age-related vascular insufficiency and positional symptoms.
The patient's elevated blood pressure also supports chronic vascular disease.
Why the other options are incorrect:
B). Cardiac arrhythmia: Typically causes sudden, unpredictable symptoms, not consistently position-related.
C). Transient ischemic attack (TIA): Causes focal neurological deficits, not just positional dizziness that resolves with rest.
D). Dissecting aortic aneurysm: Presents with severe, tearing chest or back pain, not positional lightheadedness.
Exact Extract (EMT-aligned educational content):
Elderly patients commonly experience dizziness or syncope due to decreased cerebral perfusion.
Atherosclerosis reduces vascular elasticity and blood flow, impairing the body's ability to compensate for position changes.
Symptoms such as lightheadedness and blurred vision upon standing indicate transient cerebral hypoperfusion.
References:
NREMT National EMS Education Standards - Cardiovascular Emergencies
EMT Training Curriculum - Syncope and Cerebral Perfusion
National EMS Scope of Practice Model - Patient Assessment and Perfusion Disorders

The correct answers are A. Mechanisms of injury, B. If entrapment occurred, and D. Total number of patients.
During the scene size-up, the EMT performs an initial overview to ensure safety and gather critical information before patient contact. NREMT guidelines emphasize specific elements that must be identified early.
Key components of scene size-up include:
1. Mechanism of Injury (MOI) (A):
Helps predict potential injuries based on how the incident occurred
Essential for determining severity and treatment priorities
2. Entrapment (B):
Determines whether patients are physically trapped
Helps anticipate need for extrication resources and delays in care
3. Number of Patients (D):
Critical for determining if additional resources are needed
Helps identify potential mass-casualty incidents (MCI)
NREMT-aligned references state:
"Scene size-up includes determining the mechanism of injury."
"Identify the number of patients and need for additional resources."
"Determine if extrication or special rescue is required."
Why the other options are incorrect:
C). Severity of the patientsThis is determined during the primary assessment, not initial scene size-up E). Which patients have diedNot part of initial size-up priorities F). Site for loading injured patientsThis is part of incident management/transport decisions, not initial size-up Exact Extracts (NREMT-aligned EMT educational references):
"Determine the mechanism of injury or nature of illness."
"Determine the number of patients."
"Assess the need for additional resources and extrication."
Clinical Priority Summary:
Scene size-up focuses on environmental awareness and resource needs, specifically MOI, patient count, and entrapment, making A, B, and D correct.
References:
NREMT EMT Education Standards - EMS Operations (Scene Size-Up)
NREMT National Continued Competency Program (NCCP)
AAOS Emergency Care and Transportation of the Sick and Injured (NREMT-aligned)