NLE Emergency & Critical Care Nursing — Basic & Advanced Life Support (CPR/ACLS)Detailed Explanation

The Chain of Survival

The Chain of Survival is a metaphor used by the American Heart Association (AHA) to describe the five sequential, interdependent actions that maximize survival from cardiac arrest. Think of it like a chain used to pull a patient back from death — if any single link is weak or missing, the entire chain fails. For out-of-hospital cardiac arrest (OHCA), the chain begins in the community; for in-hospital cardiac arrest (IHCA), it begins with surveillance and prevention systems already in place. The five links are: 1. Early Recognition and Activation of Emergency Response — Recognize cardiac arrest immediately (no normal breathing, no pulse within 10 seconds) and activate the code/emergency response system. In Philippine hospitals, this typically means calling a code blue. 2. Early High-Quality CPR — Start compressions immediately. This is the link most directly under the nurse's control and the most critical early intervention. 3. Rapid Defibrillation — Apply the AED or defibrillator as soon as it is available. Every minute without defibrillation for VF/pulseless VT reduces survival by 7 to 10 percent. 4. Effective Advanced Life Support — ACLS interventions: advanced airway, IV/IO access, medications, and rhythm-specific treatment. 5. Integrated Post-Cardiac Arrest Care — After return of spontaneous circulation (ROSC), manage oxygenation, perfusion, targeted temperature management, and identify the underlying cause. For the NLE, understand that the nurse's primary, most impactful roles are in Links 1 and 2. Maslow's Hierarchy of Needs places physiologic needs (circulation, oxygenation) at the highest priority — this is why compressions come before anything else.

Basic Life Support: The C-A-B Sequence and High-Quality Compressions

BLS is the foundation of all resuscitation. The 2010 AHA guidelines changed the sequence from A-B-C (Airway-Breathing-Circulation) to C-A-B (Compressions-Airway-Breathing) because research showed that delays in starting compressions were the most common and most harmful error. When a person collapses, there is still a reservoir of oxygenated blood in the coronary arteries and brain — compressions circulate that blood immediately. Waiting to open the airway first causes critical delays. **The BLS Steps (Adult):** 1. Ensure scene safety 2. Check responsiveness (tap shoulders, shout: 'Are you okay?') 3. Simultaneously check for breathing AND carotid pulse for NO MORE THAN 10 seconds. Agonal (gasping) breathing = NO breathing 4. Activate emergency response system; retrieve AED 5. Begin chest compressions 6. After 30 compressions, open airway (head-tilt/chin-lift; jaw-thrust if trauma suspected) and give 2 rescue breaths 7. Repeat 30:2 cycles **High-Quality Compression Parameters (NLE High-Yield Numbers):** • Rate: 100 to 120 compressions per minute (use a metronome or the beat of 'Stayin' Alive' by the Bee Gees) • Depth (adult): AT LEAST 5 cm (2 inches), NOT MORE THAN 6 cm (2.4 inches) • Compression:Ventilation ratio — 30:2 for single rescuer (all ages) and two rescuers in adults • Two-rescuer child/infant: 15:2 • Hand position: heel of one hand on LOWER HALF of the sternum; other hand on top; fingers interlaced and lifted • Allow FULL CHEST RECOIL — do not lean on the chest between compressions • Minimize interruptions — chest compression fraction should be ≥60% of total arrest time • Switch compressors every 2 minutes (fatigue degrades quality even before you feel tired) **Pediatric/Infant Modifications:** • Depth: approximately ONE-THIRD of anteroposterior (AP) chest diameter - Child (1 year to puberty): ~5 cm - Infant (under 1 year): ~4 cm • Single-rescuer infant: two-finger technique (middle and ring fingers on sternum, one finger-width below the nipple line) • Two-rescuer infant: two-thumb encircling technique (both thumbs on sternum, hands encircle chest) • Two-rescuer ratio for child/infant: 15:2 (more breaths because children's arrests are more often respiratory in origin) **Rescue Breathing:** • Each breath: delivered over ~1 second, just enough to produce visible chest rise • Avoid excessive ventilation — raises intrathoracic pressure, reduces venous return, causes gastric inflation • With advanced airway in place: continuous compressions at 100–120/min + 1 breath every 6 seconds (10 breaths/min), no pausing

Automated External Defibrillator (AED) Use

The AED is one of the most powerful life-saving tools in emergency care. It is designed to be used by laypeople and nurses alike, with clear voice and visual prompts. For ventricular fibrillation (VF) and pulseless ventricular tachycardia (pVT) — the two shockable rhythms — defibrillation is the DEFINITIVE treatment. Every minute that passes without defibrillation in VF/pVT reduces survival by approximately 7 to 10 percent. The AED automates rhythm analysis and shock decision-making, removing guesswork. **Steps for AED Use:** 1. **Power ON** — open the case and press the power button (or open the lid to auto-power in some models) 2. **Attach pads** to the bare, dry chest: - Pad 1: below the right clavicle (right side, below the collarbone) - Pad 2: left lower lateral chest (left mid-axillary line, 4th–5th intercostal space) - Pads must not touch each other 3. **Stop CPR and clear the patient** while the AED analyzes the rhythm — NO ONE touches the patient during analysis 4. If SHOCK ADVISED: clearly announce 'CLEAR!' while visually scanning that no one is touching the patient → deliver the shock 5. **IMMEDIATELY resume compressions** for 2 minutes — do NOT pause to check rhythm or pulse right after a shock 6. After 2 minutes, allow AED to re-analyze **Special Situations for AED Use:** • **Transdermal medication patches (e.g., nitroglycerin, fentanyl):** Remove and wipe the site before placing the pad. Pads placed over patches cause poor shock delivery and skin burns. • **Implanted pacemaker/ICD:** Place pads at least 2.5 cm (1 inch) away from the device. The device may be visible as a bulge under the skin. Alternatively, use anterior-posterior pad placement. • **Wet chest:** Dry the chest thoroughly before attaching pads — water conducts electricity away from the heart and can cause arcing to rescuers. • **Hairy chest:** Some AED kits include a razor. Quickly shave the area where pads will be placed. If no razor, press pads firmly; if still not adhering, rapidly remove and reapply (this removes some hair). • **Pediatric use:** Use pediatric pads with dose attenuator if available (reduces energy for children under 8 years or under 25 kg). If ONLY adult pads are available, use them — do not delay shocking. Place one pad on the anterior chest and one on the posterior to avoid overlap. **Key AED Principles:** • The AED does NOT shock asystole or PEA — these are non-shockable rhythms. If 'no shock advised' is announced, immediately resume CPR. • Resume compressions IMMEDIATELY after shock — before pulse check, before rhythm check • Minimize the pre-shock pause (time from last compression to shock delivery) to less than 10 seconds • The peri-shock pause (last compression to first post-shock compression) should be as brief as possible

ACLS: Shockable vs. Non-Shockable Rhythms and Drug Therapy

Advanced Cardiovascular Life Support (ACLS) builds on high-quality BLS by adding rhythm interpretation, vascular access, medications, and advanced airway management. The central decision in ACLS is: Is this rhythm SHOCKABLE or NON-SHOCKABLE? **SHOCKABLE RHYTHMS: VF and Pulseless VT** Ventricular fibrillation (VF) is chaotic, disorganized electrical activity — the heart quivers and does not pump. Pulseless ventricular tachycardia (pVT) is fast, organized but ineffective — the ventricles contract so rapidly they cannot fill. Both are SHOCKABLE. ACLS Algorithm for VF/pVT: 1. Defibrillate (shock) → immediately resume CPR for 2 minutes 2. Check rhythm → if still VF/pVT → shock again → resume CPR 3. After the second shock: give EPINEPHRINE 1 mg IV/IO every 3–5 minutes 4. If VF/pVT persists after 2–3 shocks: add AMIODARONE 300 mg IV/IO (first dose), then 150 mg IV/IO (second dose if needed) 5. Lidocaine is an acceptable alternative to amiodarone 6. Continue shock → CPR → epinephrine → antiarrhythmic cycling **CRITICAL Drug Concentration Alert (NLE HIGH-YIELD):** • Arrest Epinephrine: 1 mg IV/IO, using 1:10,000 concentration (1 mg in 10 mL) • Anaphylaxis Epinephrine: 0.3–0.5 mg IM, using 1:1,000 concentration (1 mg in 1 mL) • These are DIFFERENT concentrations and DIFFERENT routes — confusing them is a dangerous and commonly tested error! **NON-SHOCKABLE RHYTHMS: Asystole and PEA** Asystole is a flat line — no electrical activity. Pulseless Electrical Activity (PEA) is organized electrical activity on the monitor but NO palpable pulse. Neither is treated with a shock. ACLS Algorithm for Asystole/PEA: 1. High-quality CPR immediately 2. EPINEPHRINE 1 mg IV/IO every 3–5 minutes — give as early as possible 3. No antiarrhythmics (amiodarone is not indicated) 4. AGGRESSIVELY search for and treat REVERSIBLE CAUSES (the Hs and Ts) 5. Confirm asystole in MORE THAN ONE LEAD — fine VF can look like a flat line in a single lead **The Hs and Ts — Reversible Causes of Cardiac Arrest:** Hs: • Hypovolemia — most common cause of PEA; treat with IV fluids • Hypoxia — treat with airway and high-flow O2 • Hydrogen ion (Acidosis) — sodium bicarbonate if severe • Hypo-/Hyperkalemia — electrolyte replacement or correction • Hypothermia — active rewarming Ts: • Tension Pneumothorax — needle decompression (2nd intercostal space, midclavicular line) • Tamponade (Cardiac) — pericardiocentesis • Toxins/Drugs — specific antidotes (e.g., naloxone for opioid OD) • Thrombosis, Pulmonary — thrombolytics • Thrombosis, Coronary — primary PCI **Post-ROSC Care:** After return of spontaneous circulation (ROSC): • Target O2 saturation 94–99% (avoid hyperoxia) • Target normal PaCO2 (35–45 mmHg — avoid hypercapnia AND hypocapnia) • Targeted temperature management (TTM/therapeutic hypothermia) if indicated • Identify and treat underlying cause (e.g., primary PCI for STEMI) • Maintain MAP ≥65 mmHg; systolic BP ≥90 mmHg with vasopressors as needed

Foreign-Body Airway Obstruction (Choking) Management

Choking is a true airway emergency that, if not recognized and managed quickly, leads to hypoxia, loss of consciousness, and cardiac arrest. The management strategy depends on two variables: the SEVERITY of the obstruction and the AGE of the victim. **Severity Classification:** **Mild (Partial) Obstruction:** • Patient CAN cough forcefully, speak, or wheeze • Air is still moving — some airway is patent • Management: ENCOURAGE CONTINUED COUGHING — the patient's natural cough is the most effective force for expelling a foreign body. Do NOT intervene physically; patting the back during a partial obstruction may dislodge the object further in. **Severe (Complete) Obstruction:** • Patient CANNOT speak, cough effectively, or breathe • Universal choking sign: hands clutching the throat • Patient may be cyanotic, panicking, or silent • Requires IMMEDIATE physical intervention **Management by Age and Condition:** **Responsive Adult or Child (>1 year):** • Abdominal thrusts — the Heimlich maneuver • Technique: Stand behind the victim, one foot forward for stability; wrap arms around the waist; make a fist with one hand, thumb side against the abdomen just ABOVE the navel and BELOW the xiphoid process; cover fist with other hand; deliver firm, quick, INWARD AND UPWARD thrusts • Repeat until the object is expelled or the victim becomes unresponsive • Exception: for PREGNANT women or OBESE patients — use CHEST THRUSTS (same position and force, but hands on the lower sternum, not the abdomen) **Responsive Infant (< 1 year):** • DO NOT perform abdominal thrusts — risk of injury to the liver/abdominal organs • 5 BACK SLAPS: hold infant face-down on your forearm, head lower than trunk; deliver 5 firm back slaps between the shoulder blades with the heel of your hand • 5 CHEST THRUSTS: turn infant face-up on your forearm; deliver 5 chest thrusts with two fingers on the center of the sternum (same position as CPR compressions) • Alternate 5 back slaps + 5 chest thrusts continuously until object is expelled or infant becomes unresponsive **Victim Becomes UNRESPONSIVE:** • Lower the victim safely to the ground • Activate emergency response system (call for help/code) • Begin CPR — START WITH COMPRESSIONS (C-A-B) • Each time the airway is opened for rescue breaths: LOOK in the mouth for a visible object and remove it if seen • NEVER perform a blind finger sweep — this can push the object deeper into the airway • Continue CPR until object is expelled or advanced airway team arrives **Summary Table:** | Victim | Responsive | Becomes Unresponsive | |--------|-----------|---------------------| | Adult (>1 yr) | Abdominal thrusts | Start CPR, remove only visible objects | | Pregnant/Obese | Chest thrusts | Start CPR | | Infant (<1 yr) | 5 back slaps + 5 chest thrusts | Start CPR (infant technique) |

ACLS Team Dynamics, Closed-Loop Communication, and Nursing Documentation

Resuscitation is inherently a team effort, and the quality of teamwork directly affects outcomes. Research shows that even teams with excellent individual technical skills can fail due to poor communication, role confusion, and missed steps. Understanding effective resuscitation team dynamics is increasingly tested in the NLE and is central to professional nursing practice under RA 9173. **Roles in a Resuscitation Team:** • **Team Leader:** Physician or most experienced clinician; stands back to observe the whole picture; does NOT perform compressions (so they can observe and direct); calls out the plan, current rhythm, elapsed time, and next steps; accepts input from all team members • **Compressor:** Delivers high-quality chest compressions; switches every 2 minutes • **Airway Manager:** Opens airway, delivers ventilations, places advanced airway (intubation) • **IV/IO Access and Medication Nurse:** Establishes access; draws up and administers drugs; confirms drug doses • **Recorder/Documenter:** Times and records all interventions, drug doses, rhythm checks, and compressor switches • **AED/Defibrillator Operator:** Applies pads, analyzes rhythm, clears team for shock, delivers shock **Closed-Loop Communication:** This is the gold standard of team communication in resuscitation. The process: 1. Team leader issues a clear directive: 'Nurse Santos, please give epinephrine 1 mg IV now' 2. Receiver acknowledges: 'Epinephrine 1 mg IV, understood' 3. Receiver confirms completion: 'Epinephrine 1 mg IV given — it is now 10:23 AM' This three-step loop prevents drugs from being missed (nobody did it because everyone thought someone else did) or double-dosed (two nurses both gave it because neither confirmed aloud). **Mutual Respect and Speaking Up:** Any team member who notices an error — compression depth too shallow, an interruption dragging on, a wrong dose — should speak up immediately and respectfully: 'Team leader, compressions appear too shallow — may I call for a switch?' A psychologically safe environment where anyone can raise a safety concern saves lives. **Monitoring Tools During Resuscitation:** • **Quantitative CPR feedback devices:** Provide real-time feedback on rate, depth, and recoil — remove subjectivity • **End-tidal CO2 (ETCO2) monitoring:** Normal ETCO2 during CPR is 10–20 mmHg. An abrupt rise to ≥35–40 mmHg is one of the first signs of ROSC — the heart is now circulating blood and CO2 is being delivered to the lungs. Persistent low ETCO2 (<10 mmHg) despite good technique suggests poor prognosis. **Post-Event Debriefing:** After every resuscitation event — regardless of outcome — the team should conduct a structured debrief: • What went well? (reinforce and celebrate) • What could be improved? (identify gaps without blame) • Are there any team members who need emotional support? Debriefing improves future performance and team cohesion, and is a key component of a learning resuscitation culture.

This problem tests two separate but related concepts: (1) how the C:V ratio changes with the number of rescuers for pediatric patients, and (2) age-specific depth targets. Single-rescuer BLS for all ages uses 30:2. Two-rescuer for CHILD and INFANT uses 15:2 (not adults — adults always use 30:2 regardless of rescuer number). Pediatric depth is one-third AP diameter: approximately 5 cm for a child, approximately 4 cm for an infant. This is different from the adult 5–6 cm target.

This tests the ACLS VF/pVT algorithm sequence. Epinephrine is given every 3–5 minutes starting after the second shock (not the first). Amiodarone is added for refractory VF (usually after the second or third shock). The key here is that both drugs are given WITHOUT interrupting CPR — they are administered during compressions, not during pauses. The 1:10,000 concentration for epinephrine is critical — confusing it with the anaphylaxis concentration (1:1,000) is a common and dangerous error.

Pregnancy is a specific contraindication to abdominal thrusts because the enlarged uterus makes the maneuver ineffective and risks harm to the fetus and gravid uterus. Chest thrusts (same as the technique used in CPR but performed from behind on a sitting/standing patient) achieve the sudden increase in intrathoracic pressure needed to expel the foreign body. This scenario tests both the severity classification (complete obstruction because she cannot speak) and the pregnancy-specific modification.

This problem requires applying clinical assessment data (dialysis patient + missed sessions + peaked T-waves + wide QRS) to identify the correct H from the Hs and Ts. PEA with an identifiable reversible cause has a much better outcome than PEA without one — that is WHY the Hs and Ts are so important. The nurse's role is not just to perform CPR but to recognize clinical clues, communicate them to the team, and anticipate the medications needed. This tests higher-order application and clinical reasoning skills.

This problem tests understanding of why the 2-minute switch rule exists. It is not about whether the nurse feels tired — it is about objective evidence that compressions become less effective even when the rescuer feels capable. Switching every 2 minutes maintains the high-quality compression fraction that is directly linked to survival. The team leader's role includes monitoring this and proactively directing the switch.