Disaster Nursing & Emergency Preparedness - Memory Anchors
Memory anchors transform complex disaster nursing concepts into vivid, unforgettable mental images. For the NLE, where a single triage decision can determine the correct answer, these anchors give you an instant mental shortcut under exam pressure. Each anchor creates a 'hook' in your long-term memory — so when you see a question about START triage or CBRN response, your brain automatically retrieves the right answer. Think of these as your mental 'go-bag': packed, ready, and accessible when disaster (or the exam) strikes.
Memory anchors
The Four Phases of Disaster Management in order: Mitigation, Preparedness, Response, Recovery
Memory aid
MPRR — 'Mga Pilipino Ready at Resilient!' Picture a resilient Pilipino family on their rooftop after a typhoon, holding a banner that says 'MPRR.' M = Mitigation (they built the strong roof BEFORE the storm), P = Preparedness (they packed their go-bag the night before), R = Response (they are rescue themselves during the flood), R = Recovery (they rebuild the next day). The acronym MPRR sounds like 'Maging Pilipino na Ready at Resilient' — a phrase every Filipino nursing student can feel in their heart.
Why it works
Acronyms compress a sequence into a single memorable word, and attaching a culturally resonant Filipino phrase creates emotional encoding that dramatically boosts retention.
Example usage
Exam question: 'A nurse is conducting hazard mapping and building flood-control projects in a coastal barangay. Which phase of disaster management is this?' Trigger MPRR — M = Mitigation. Answer: Mitigation phase.
Recall trigger
Think of a resilient Filipino family on a rooftop — MPRR.
Mitigation = actions BEFORE a disaster to PREVENT or REDUCE impact
Memory aid
Mitigation is like putting on sunscreen BEFORE going to the beach at Boracay. You do not wait for the sunburn to appear — you prevent it from happening. Building codes, hazard mapping, mangrove planting — these are the 'sunscreen' of disaster management. Once the 'sunburn' (disaster) arrives, it is too late to mitigate. The word 'Mitigate' even sounds like 'mi-tigate' — you gate or block the disaster before it enters.
Why it works
Analogies to familiar daily experiences (Boracay beach, sunscreen) create concrete mental images for abstract concepts, making the distinction between mitigation and preparedness instantly clear.
Example usage
Exam question: 'Which activity belongs to the mitigation phase?' Options include hazard mapping, disaster drills, evacuation, and rebuilding. Recall sunscreen = prevention BEFORE. Answer: Hazard mapping.
Recall trigger
Sunscreen at Boracay — block it BEFORE it happens.
START Triage Parameters in order: Respirations, Perfusion, Mental Status (RPM)
Memory aid
RPM — think of an ambulance speeding to a disaster site. Ambulances have an RPM gauge on the dashboard! Every second counts — you rev the engine (RPM) to save lives. R = Respirations (is the engine running?), P = Perfusion (is there fuel/blood reaching the engine?), M = Mental Status (is the driver/patient conscious and in control?). When you see a mass-casualty scene, your brain goes straight to 'check the RPM!'
Why it works
Linking RPM to an ambulance speedometer creates a strong visual-contextual association — the setting (ambulance = emergency) matches the content (triage), doubling memory consolidation.
Example usage
Exam question: 'In START triage, after assessing respirations and perfusion, what is the NEXT parameter to assess?' Recall ambulance RPM — after R and P comes M. Answer: Mental Status.
Recall trigger
Ambulance RPM gauge — R, P, M in exact order.
START Triage Colors and Priorities: RED = Immediate, YELLOW = Delayed, GREEN = Minor, BLACK = Expectant/Deceased
Memory aid
Remember the Filipino traffic light — but with an extra color and a twist! 'Red Yells, Green Moves, But (Black) Nobody Goes.' RED = Yell for help immediately (immediate/salvageable). YELLOW = You wait a moment (delayed/stable). GREEN = Go on your own, you are okay (minor/walking wounded). BLACK = 'But Nobody Goes' — nobody treats you because resources cannot save you. The phrase 'Red Yells, Green Moves, But Nobody Goes' locks all four in one sentence in the correct priority order.
Why it works
Sentence mnemonics that use the first letter of each category word (Yells-Red, Moves-Green) create multi-layered encoding — both the color and the meaning are embedded together.
Example usage
Exam question: 'A victim in a mass-casualty event is ambulatory and has minor lacerations. Which START triage tag is assigned?' Recall Green Moves (walking wounded). Answer: GREEN tag.
Recall trigger
Philippine traffic light with four colors — Red Yells, Green Moves, But Nobody Goes.
BLACK tag in mass-casualty triage = NOT treated first, even though most severely injured — greatest good for greatest number
Memory aid
Imagine Nurse Cardo at the site of a collapsed building in Manila after a major earthquake. He finds two victims: Victim A has a crushed chest and massive brain herniation — clearly unsalvageable. Victim B is in shock with uncontrolled bleeding from a femoral artery — salvageable with immediate intervention. Every instinct tells Cardo to rush to the most injured (Victim A), but he stops himself. He whispers: 'Disaster nursing is not individual nursing. My goal is to save the MOST lives.' He tags Victim A as BLACK, goes to Victim B, controls the bleeding, and saves a life. He returns to Victim A and provides comfort. One decision. Two lives remembered forever.
Why it works
Micro-stories with named characters create emotional engagement and ethical tension, which activates the amygdala — the brain's emotional memory center — for deep encoding of counterintuitive concepts.
Example usage
Exam question: 'In a mass-casualty event, which patient receives treatment FIRST?' The key is: NOT the most severely injured (BLACK), but the RED salvageable patient. Answer: RED — immediate/salvageable.
Recall trigger
Nurse Cardo's choice at the collapsed building — greatest good for greatest number.
START — Respiration threshold: RR > 30 = RED; absent after airway opening = BLACK
Memory aid
The number 30 is your RED alarm. Think: '30 na, RED na!' (Filipino expression — 'already 30, already in trouble!'). If breathing is more than 30 per minute — the patient is in respiratory distress — RED immediately. If no breathing even after you open the airway — the patient is gone — BLACK. Memory chunk: '30 = RED, NONE = BLACK.' Write this in your brain like a jeepney sign: '30 RED | 0 BLACK.' Two numbers. Two colors. Life or death.
Why it works
Chunking reduces the number of items to memorize (two numbers, two colors) and attaches a culturally familiar Filipino expression ('30 na!') that adds emotional weight.
Example usage
Exam question: 'A non-breathing victim's airway is repositioned and breathing resumes at 34/min. What triage tag?' — breathing resumes (not BLACK), RR = 34 > 30. Answer: RED.
Recall trigger
Jeepney sign: '30 RED | 0 BLACK'
START — Perfusion assessment: absent radial pulse OR capillary refill > 2 seconds = RED
Memory aid
Picture yourself pressing on someone's fingernail. The nail goes white. You count: 1 — 2 — if it does NOT pink up by count of 2, the blood is NOT reaching — the patient is RED. Visualize a stopwatch frozen at the 2-second mark with a big RED border around it. No radial pulse at the wrist? Same image — RED stopwatch. The visual cue: 'Clock stops at 2, color turns RED.' Also remember: the wrist (radial pulse) is like a water tap — if no water flows, the pipes (circulation) have failed.
Why it works
Visual associations with action (pressing a fingernail) and imagery (red-bordered stopwatch) engage the visual cortex and motor memory, creating dual-channel encoding for a precise numerical threshold.
Example usage
Exam question: 'Capillary refill time is 3 seconds. What START triage category?' 3 > 2 = RED. Answer: RED tag — immediate.
Recall trigger
Stopwatch frozen at 2 with a RED border — cap refill > 2 seconds = RED.
START — Mental Status: cannot follow simple commands = RED; can follow commands = YELLOW
Memory aid
Think of the barangay captain giving commands during an evacuation: 'Lumabas na kayo!' (Everyone get out!). If a victim can follow that command — they are aware, brain is working — YELLOW (delayed, stable enough to wait). If a victim cannot follow ANY simple command — their brain is not working properly — RED (immediate). Memory hook: 'Follows captain = Yellow and waits. Cannot follow = Red alert brain.'
Why it works
Using a culturally familiar Philippine scenario (barangay captain during evacuation) makes the abstract concept of 'following commands' concrete and rooted in real-world disaster context.
Example usage
Exam question: 'A victim has RR 24/min, radial pulse present, but cannot squeeze the nurse's hand on command. What tag?' R = adequate, P = adequate, M = cannot follow command = RED. Answer: RED.
Recall trigger
Barangay captain giving evacuation orders — follows = YELLOW, cannot follow = RED.
CBRN = Chemical, Biological, Radiological, Nuclear
Memory aid
CBRN — 'Cannot Be Recovered Normally.' These are hazardous events so extreme that normal nursing protocols cannot handle them — you need special PPE, decontamination, and command structures. C = Chemical (fastest onset), B = Biological (delayed — incubation period), R = Radiological (contaminated dispersal), N = Nuclear (blast + radiation). 'Cannot Be Recovered Normally' — each word's first letter spells CBRN, and the phrase reminds you WHY these events are special.
Why it works
A meaningful phrase that expands the acronym into a conceptual truth makes the abbreviation self-explanatory and harder to forget than a random letter combination.
Example usage
Exam question: 'What does CBRN stand for?' Recall 'Cannot Be Recovered Normally' — C = Chemical, B = Biological, R = Radiological, N = Nuclear.
Recall trigger
'Cannot Be Recovered Normally' — CBRN.
CBRN — Nurse protects SELF (PPE) first, then DECONTAMINATE before treatment
Memory aid
Nurse Ana rushes to the scene of a chemical spill in a factory in Batangas, wanting to immediately help the workers covered in toxic fluid. Her senior nurse grabs her arm: 'Wag! (Don't!) Put your PPE on first. An incapacitated nurse helps no one. Then we decontaminate them before they enter the treatment area — or WE become the next patient.' Ana pauses, suits up, and they safely strip and wash the victims outside. Twenty workers are saved. Zero nurses become patients. The lesson: 'PPE first, decon second, treat third.' Nurse Ana's story = PPE-Decon-Treat in exact order.
Why it works
A near-miss story with a named Filipino nurse and a local Philippine setting (Batangas factory) creates emotional investment — students remember the story and automatically recall the sequence.
Example usage
Exam question: 'A nurse arrives at a chemical explosion scene. What is the PRIORITY action?' Recall Nurse Ana — PPE first. Answer: Don appropriate PPE before approaching victims.
Recall trigger
Nurse Ana at the Batangas factory — PPE first, decon second, treat third.
Nerve agent antidotes: Atropine + Pralidoxime (2-PAM)
Memory aid
Nerve agents like sarin make you 'SLUDGE' (Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis) — the classic cholinergic toxidrome. The antidotes are 'AP' — Atropine and Pralidoxime. Remember: 'Attack the Poison with AP.' Atropine blocks the cholinergic crisis (blocks the SLUDGE). Pralidoxime reactivates acetylcholinesterase (the enzyme the nerve agent inactivated). Phrase: 'Atropine dries the SLUDGE, Pralidoxime fixes the enzyme.' AP — Attack the Poison.
Why it works
The SLUDGE acronym for cholinergic toxidrome combined with 'AP — Attack the Poison' creates a paired encoding: knowing the symptoms automatically triggers the two-drug antidote treatment.
Example usage
Exam question: 'A victim of a nerve agent attack presents with excessive secretions, miosis, and muscle twitching. What antidotes are administered?' Recall SLUDGE → AP. Answer: Atropine and Pralidoxime.
Recall trigger
SLUDGE → Attack with AP (Atropine + Pralidoxime).
Radiation protection: Time, Distance, Shielding — plus Potassium Iodide for radioactive iodine
Memory aid
TDS — 'Take Distance and Shield' for radiation! T = Time (less time near source = less dose), D = Distance (more distance = exponentially less radiation — inverse square law), S = Shielding (lead, concrete, or distance of water/earth block gamma rays). And for the thyroid: 'KI protects your thyroid's TI(tissue)' — Potassium Iodide (KI) floods the thyroid with stable iodine so it cannot absorb radioactive iodine. Remember: 'TDS and KI — radiation's foe.' Think of your phone's TDS setting to minimize data exposure — same idea, minimize radiation exposure.
Why it works
TDS is a familiar abbreviation in Philippine tech culture, creating a bridge from everyday language to clinical content. Pairing it with KI (a medication) in a rhyme reinforces both concepts simultaneously.
Example usage
Exam question: 'What medication protects the thyroid from radioactive iodine in a nuclear event?' Recall KI after TDS. Answer: Potassium Iodide.
Recall trigger
Phone TDS setting — Time, Distance, Shielding. Plus KI for thyroid.
RA 10121 = Philippine DRRM Act of 2010; created NDRRMC; emphasizes Risk REDUCTION
Memory aid
RA 10121 — split it: '10' = 2010 (the year), '121' = sounds like '1-2-1' = a march cadence, marching FORWARD into risk reduction! RA 10121 created the NDRRMC — 'National DRRM Council.' Memory chunk: '10-121 NDRRMC DRRM.' The key word is REDUCTION — it shifted from reactive RESPONSE to proactive RISK REDUCTION. Visualize: the old way was a firefighter running TOWARD a fire (reactive response). The new RA 10121 way is an engineer installing sprinklers BEFORE the fire (risk reduction). RA 10121 = sprinkler system, not fire truck.
Why it works
Splitting the law number into year cues and a march cadence makes retrieval easier, while the firefighter-vs-engineer analogy concretizes the policy shift from response to risk reduction.
Example usage
Exam question: 'What Philippine law created the NDRRMC and emphasized disaster RISK REDUCTION?' Answer: RA 10121 — Philippine Disaster Risk Reduction and Management Act of 2010.
Recall trigger
Sprinkler vs. fire truck — RA 10121 = proactive risk reduction, NDRRMC.
Psychological First Aid (PFA) = Look, Listen, Link — NOT formal therapy; does NOT force talking
Memory aid
PFA = 3 L's: 'Look, Listen, Link' — like a caring Ate or Kuya checking on a distressed sibling after a disaster. Ate LOOKS (observes for safety and signs of distress), then LISTENS (approaches, asks what you need, makes you feel heard — but does NOT force you to tell your trauma story), then LINKS (connects you to water, food, shelter, family, and services). The phrase: 'PFA is the 3-L Ate/Kuya check-in.' Key rule: NO debriefing, NO forcing trauma retelling. PFA is NOT therapy — it is human support.
Why it works
The Filipino sibling metaphor (Ate/Kuya checking on a sibling) is a deeply familiar and emotionally resonant cultural context, making the sequence Look-Listen-Link feel natural and memorable.
Example usage
Exam question: 'A nurse is providing Psychological First Aid to a flood survivor. What are the core actions?' Recall Ate's 3-L check-in. Answer: Look, Listen, Link.
Recall trigger
Ate/Kuya doing the 3-L check-in — Look, Listen, Link.
Disaster care goal = GREATEST GOOD for GREATEST NUMBER (population), vs. routine care = greatest good for individual
Memory aid
Think of a family-sized Jollibee Chickenjoy bucket at a fiesta — you have 10 pieces for 20 hungry guests. In a fiesta (disaster setting), you distribute one piece each to maximize who gets fed (greatest good for greatest number). In a normal sit-down restaurant (routine clinical care), you give ONE patient everything on the menu. Disaster nursing = fiesta bucket distribution. Clinical nursing = restaurant table service. When the 'bucket is limited' and people are many — you switch to fiesta mode.
Why it works
Jollibee fiesta imagery is deeply Filipino and instantly visualized; the contrast between restaurant service (individual care) and fiesta distribution (mass care) makes the philosophical shift in disaster nursing unforgettable.
Example usage
Exam question: 'How does the goal of care in a mass-casualty event DIFFER from routine clinical care?' Recall Jollibee fiesta bucket. Answer: Disaster care seeks the greatest good for the greatest number; routine care focuses on the individual patient.
Recall trigger
Jollibee Chickenjoy bucket at a fiesta — distribute to the most people.
Recovery phase = LONGEST phase; includes rebuilding, ongoing healthcare, disease surveillance, evaluation
Memory aid
Recovery after a disaster is like recovery after a major surgical operation in the hospital. Surgery (Response) is intense but SHORT. The postoperative ICU stay (immediate recovery) is also short. But the full rehabilitation and healing period (Recovery phase) takes MONTHS to YEARS. Nobody says 'Recovery is fast.' The community needs to rebuild homes (infrastructure), restore clinics (services), treat ongoing injuries and trauma (healthcare), watch for infections (disease surveillance), and evaluate what went wrong (lessons learned for next time). Recovery = the long, slow healing of a community.
Why it works
Surgical recovery is a concept familiar to every nursing graduate; mapping it onto community disaster recovery creates an intuitive understanding of time scale and the multiple components involved.
Example usage
Exam question: 'Which disaster management phase is the LONGEST and includes disease surveillance and community rebuilding?' Recall post-surgical rehab. Answer: Recovery phase.
Recall trigger
Post-surgical rehabilitation — longest, multi-component healing process.
Biological CBRN events: delayed onset due to incubation period; recognized by unusual illness clusters; priority = isolation, infection control, prophylaxis
Memory aid
Dr. Santos, an epidemiologist in Manila, notices something strange: five patients in three different barangays arrive at the ER with fever, swollen lymph nodes, and cough — all within the same week, all having attended the same market. Unlike a chemical spill (instant victims), these patients came in slowly over days. He thinks: 'This is NOT chemical — no immediate onset. This is BIOLOGICAL — there is an incubation period.' He immediately orders isolation, initiates infection control protocols, contacts the DOH, and recommends prophylaxis for exposed contacts. The unusual cluster of illness was the first clue. The incubation period was the biological calling card.
Why it works
An epidemiological detective story set in Manila activates narrative memory; the contrast with chemical events (instant onset) helps differentiate CBRN categories through a memorable scenario.
Example usage
Exam question: 'What CBRN event is characterized by DELAYED onset and unusual clusters of illness?' Recall Dr. Santos's market outbreak. Answer: Biological event — due to incubation period.
Recall trigger
Dr. Santos and the unusual illness cluster — incubation = biological CBRN.
Go-bag contents for family disaster preparedness
Memory aid
GO-BAG = 'Go Out Boldly And Be Alive Always, Get home!' Use the letters G-O-B-A-G: G = Grub/food (non-perishable food), O = OK-water (safe water supply), B = Bandages + first-aid supplies, A = All important documents + medicines, G = Gadgets: flashlight, batteries, whistle. Bonus: family communication plan and meeting point. Picture yourself lifting a heavy GO-BAG labeled with these five things. Every Filipino family heading to an evacuation center needs their GO-BAG packed and ready.
Why it works
Using the word itself (GO-BAG) as the acronym creates a perfect contextual mnemonic — the container and its contents share the same memory address in the brain.
Example usage
Exam question: 'A nurse is educating a family about disaster preparedness. What items should be included in a go-bag?' Recall GO-BAG. Answer: Water, non-perishable food, medications, first-aid supplies, flashlight, batteries, whistle, copies of important documents, and a family communication plan.
Recall trigger
GO-BAG: Grub, OK-water, Bandages, All documents + meds, Gadgets.
START — First step: direct all walking victims to move aside = GREEN (minor) tag; then assess non-walkers with RPM
Memory aid
Picture a barangay plaza after an earthquake. The nurse stands in the center and shouts: 'Kung kaya ninyong lumakad, pumunta kayo sa kanan!' (If you can walk, go to the right!). Everyone who shuffles or runs to the right — GREEN tag, assessed later. Those who do not move — now the nurse goes to them one by one and checks RPM (Respirations, Perfusion, Mental Status). The image: nurse in plaza, people walking right = GREEN. Non-movers on the ground = RPM assessment starts NOW. The walking = Green. The grounded = RPM.
Why it works
A vivid scene set in a familiar Philippine barangay plaza context creates spatial memory — the nurse's position in the plaza, the direction (right), the contrast between walkers and non-walkers form a complete spatial narrative.
Example usage
Exam question: 'In START triage, what is the FIRST action after calling out to victims?' Recall plaza scene. Answer: Direct all ambulatory victims to move to a safe area — they are tagged GREEN.
Recall trigger
Barangay plaza scene — walkers go right (GREEN), non-walkers get RPM.
PFA promotes five key principles: Safety, Calming, Self-efficacy, Connectedness, Hope
Memory aid
PFA promotes 'SCSCH' — but that is hard to say, so use: 'Safe, Calm Survivors Can Heal.' S = Safety (feel safe), C = Calming (reduce distress), S = Self-efficacy (empower, 'I can cope'), C = Connectedness (reunite with family, community), H = Hope (this will get better). The full sentence: 'Safe, Calm Survivors Can Heal' — five words, five principles, one powerful message for every disaster survivor you will care for as a Filipino nurse.
Why it works
Converting an abstract list of five principles into a meaningful, hopeful sentence provides semantic encoding — the MEANING of the sentence reinforces the content and is emotionally motivating for nursing students.
Example usage
Exam question: 'Which of the following is a core principle of Psychological First Aid?' Recall SCSCH — Safe, Calm Survivors Can Heal. Answer: Promoting a sense of safety, calming, connectedness, self-efficacy, and hope.
Recall trigger
'Safe, Calm Survivors Can Heal' — five PFA principles.
Revision game
I am the phase that happens BEFORE the disaster. I am not about packing bags — I am about preventing the bag from being needed at all. I am flood controls, building codes, and hazard maps. Who am I?
Answer
Mitigation Phase
Memory link
A2 — Sunscreen at Boracay before the sunburn (prevention before the disaster).
I am the ONLY triage color that means: 'You are the sickest AND savable — go to the front of the line right now.' I am NOT black. Black cannot be saved. I am the one worth all the resources. What color am I?
Answer
RED — Immediate (Priority 1)
Memory link
A4 — Red Yells for help immediately; A5 — Nurse Cardo choosing the salvageable victim.
I am two drugs. Together, we fight the agent that makes you drool, cry, urinate, defecate, and vomit all at once. One of us blocks the receptor. The other reactivates the enzyme. Name us both.
Answer
Atropine and Pralidoxime (2-PAM) — nerve agent antidotes
Memory link
A11 — SLUDGE → Attack with AP.
I am a Philippine law from 2010. I created a council with four letters. I shifted the country from reacting to disasters toward preventing them. What am I, and what council did I create?
Answer
RA 10121 — Philippine DRRM Act of 2010; created the NDRRMC
Memory link
A13 — Sprinkler system vs. fire truck; '10-121 NDRRMC'.
I am NOT therapy. I do NOT make survivors retell their trauma. I use only three words to describe my actions. What am I, and what are my three words?
Answer
Psychological First Aid (PFA) — Look, Listen, Link
Memory link
A14 — Ate/Kuya's 3-L check-in.
I am the CBRN event you will NOT recognize immediately. My victims trickle in over days — not all at once. My calling card is an incubation period and unusual illness clusters in a community. What type of CBRN event am I?
Answer
Biological CBRN event
Memory link
A17 — Dr. Santos and the unusual market illness cluster.
In a mass-casualty event, I am the very first thing a nurse does at the scene — even before touching a single victim. I protect the nurse from becoming the next patient. What am I?
Answer
Don personal protective equipment (PPE) — ensure scene safety first
Memory link
A10 — Nurse Ana at the Batangas factory: PPE first, decon second, treat third.
I am the three things you control to protect yourself from radiation. More of me you take equals more dose. Less of me means less exposure. But wait — you want LESS of me and MORE of the other two. What am I, and who are my companions?
Answer
Time (minimize) — plus Distance (maximize) and Shielding (maximize) = TDS radiation protection
Memory link
A12 — Phone TDS setting: Take Distance and Shield.
Formula mnemonics
START Triage Decision Rule: RPM — Respirations (>30 or only after airway = RED; absent after airway = BLACK) → Perfusion (absent radial pulse or cap refill >2 s = RED) → Mental Status (cannot follow commands = RED; can follow = YELLOW)
Mnemonic
RPM = 'Rev the ambulance engine': R=30 threshold (30 RED, 0 BLACK), P=2-second clock (>2 = RED), M=Captain's command (no follow = RED, follow = YELLOW).
When to use
Use this decision rule for every non-ambulatory adult victim in a mass-casualty incident using the START triage system. Apply in sequence: R first, then P if R is adequate, then M if P is adequate.
What each part means
R = Respirations — is the patient breathing adequately? Threshold is 30/min. P = Perfusion — is blood reaching the periphery? Check radial pulse and capillary refill; threshold is 2 seconds. M = Mental Status — is the brain working? Can the patient follow a simple one-step command?
Disaster Care Goal Formula: Greatest Good = Maximum Lives Saved with Limited Resources (population-based utilitarian ethics)
Mnemonic
Fiesta Chickenjoy formula: Total Resources ÷ Maximum People = Best Distribution. RED goes first, BLACK gets comfort only.
When to use
Apply when making triage decisions in any mass-casualty scenario — determines WHY black-tagged patients are not treated first and WHY red-salvageable patients get priority.
What each part means
This is a conceptual formula, not a mathematical one. 'Greatest good' = most lives saved. 'Greatest number' = the maximum number of salvageable victims. Resources (staff, equipment, supplies) are limited. BLACK victims are excluded from active treatment because resources cannot change their outcome.
Radiation Protection: Dose Reduction = ↓Time + ↑Distance + ↑Shielding (TDS Triad)
Mnemonic
TDS = 'Take Distance and Shield' — your radiation prescription. Less time + more distance + more shielding = less dose received.
When to use
Apply in any radiological or nuclear CBRN event — guides nurse positioning, patient decontamination procedures, and instructions for survivors and community members.
What each part means
Time: radiation dose is directly proportional to exposure time — halve the time, halve the dose. Distance: radiation intensity decreases with the square of distance (inverse square law) — double the distance, quarter the dose. Shielding: dense materials (lead, concrete, water) absorb radiation and reduce dose received.
Quick recall chains
The Four Phases of Disaster Management in Order
Recall test
Close your eyes. Follow Mang Pedro from his mangrove planting → go-bag packing → evacuation → rebuilding. Name each phase in order as you go.
Memory chain
Story: Mang Pedro (M = Mitigation) PREVENTS flooding by planting mangroves. Then he PREPARES (P = Preparedness) his family's go-bag before typhoon season. When the typhoon hits, he RESPONDS (R = Response) by evacuating his family to the school. After the storm, the community RECOVERS (R = Recovery) together, rebuilding homes and planting new crops. Mang Pedro's life = MPRR in perfect order. Each phase happens in sequence — you cannot recover before you respond, and you cannot respond before you prepare.
Items to remember
- Mitigation
- Preparedness
- Response
- Recovery
START Triage Full Decision Sequence
Recall test
A victim does not walk. RR = 28. Radial pulse absent. What is the tag and why? (Answer: RED — absent radial pulse = perfusion failure, no need to check Mental Status.)
Memory chain
Nurse Bea at a plaza: Step 1 — she shouts 'WALK IF YOU CAN!' (walkers = GREEN, step aside). Step 2 — she kneels by a fallen man, checks his chest: Is he breathing? RR = 34 (> 30) → RED flag raised in her mind. But wait — this man IS breathing with RR > 30, so RED. If no breathing after airway → BLACK. Step 3 — she presses his nail: color returns in 1 second → perfusion OK (proceed). Step 4 — she says 'Kurot ko kamay mo' (squeeze my hand): he squeezes → YELLOW. Final tag: YELLOW. Nurse Bea's sequence: Walk-Breathe-Blood-Brain = G-R/B-R-Y.
Items to remember
- Ask walking victims to move aside (GREEN)
- Check Respirations (>30 or none after airway opening)
- Check Perfusion (radial pulse, cap refill)
- Check Mental Status (follow commands)
- Assign RED, YELLOW, or BLACK
CBRN Categories and Key Features
Recall test
Which CBRN type has a DELAYED onset and is identified through illness clusters? (Answer: Biological — incubation period is the hallmark.)
Memory chain
C = Chemical (CRASH onset — like a car crash, immediate). B = Biological (BREW slowly — like sinigang simmering, delayed incubation). R = Radiological (RAIN of particles — contamination everywhere, wash off). N = Nuclear (NUKE = everything: blast, fire, radiation — TDS and KI protect the thyroid). CBRN = Crash, Brew, Rain, Nuke.
Items to remember
- Chemical — immediate onset, SLUDGE toxidrome, antidotes: atropine + pralidoxime
- Biological — delayed onset (incubation), unusual clusters, isolation + prophylaxis
- Radiological — contamination, TDS protection, decontaminate
- Nuclear — blast + radiation, TDS + potassium iodide
Psychological First Aid Core Actions
Recall test
You approach a silent, staring flood survivor. What are the three core PFA actions in order? (Look → Listen → Link)
Memory chain
Ate Malou sees her neighbor sitting alone after a flood (LOOK — she observes distress). She walks over, sits beside her, and gently asks 'Kumusta ka?' and just listens without pushing (LISTEN — she does not say 'tell me everything'). Then she brings water, calls the neighbor's daughter, and tells her where the relief goods are (LINK — she connects her to resources and family). Ate Malou's three moves = Look, Listen, Link.
Items to remember
- Look — observe safety and distress
- Listen — approach, ask, calm, do NOT force talking
- Link — connect to needs, services, family, information
CBRN Responder Priority Sequence
Recall test
A nurse arrives at a chemical spill. What is the FIRST priority action? (Answer: Don appropriate PPE before approaching any victim.)
Memory chain
PPE-DECON-TREAT-COMMAND = 'Paramedic Donna Thoroughly Checks.' P = PPE first (Paramedic), D = Decontaminate (Donna), T = Treat (Thoroughly), C = Command/ICS (Checks). Nurse Ana at the Batangas factory: she puts on her suit (PPE), strips and washes the victims outside (DECON), then treats hemorrhage and airway (TREAT), and radios the incident commander (COMMAND).
Items to remember
- Don PPE (protect the responder)
- Decontaminate victims BEFORE entering treatment area
- Treat life-threatening injuries
- Follow incident command structure
Diagrams
START Triage Decision Flowchart
A step-by-step flowchart of the complete START triage algorithm showing all decision points — ambulation check, RPM sequence, and all four triage tag outcomes. Students can trace any victim scenario to the correct tag color.
Disaster Nursing and Emergency Preparedness — Master Concept Map
A comprehensive mind map of all key Disaster Nursing topics covered in the NLE. Shows how all concepts — the four phases, START triage, CBRN events, Philippine law, PFA, and family teaching — connect to the central topic. Ideal for orienting before detailed study and for rapid review before the exam.
CBRN Response Priority Sequence
A flowchart showing the correct priority sequence for responding to CBRN events: PPE first, assess for life-threatening injury, decontaminate, then treat based on agent type. Reinforces that decontamination happens BEFORE the victim enters the treatment area and that responder safety (PPE) is always the first priority.
Disaster Management Phases Timeline — Before, During, and After
A timeline clearly showing when each disaster management phase occurs relative to the disaster event. Emphasizes that mitigation and preparedness are both PRE-disaster activities, response is during/immediately after, and recovery is the longest post-disaster phase.