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INTRODUCTION Basic Life Support (BLS) is the foundation of emergency cardiovascular care that focuses on maintaining circulation and breathing through high-quality CPR and early use of an AED (Automated External Defibrillator).Learning BLS equips healthcare providers and lay rescuers with the essential knowledge and skills to save lives during cardiac arrest or other life-threatening emergencies *LEARNING OUTCOMES* After completing this session on BLS Concepts and Adult Resuscitation, the learner should be able to: 1. UNDERSTAND THE CONCEPT AND IMPORTANCE OF BLS • Define Basic Life Support (BLS) and explain its role in the Chain of Survival. • Describe how early recognition, early CPR, and early defibrillation increase survival rates. • Explain the difference between BLS and Advanced Life Support (ALS). • Understand when and why BLS should be initiated in an emergency. 2. RECOGNIZE CARDIAC ARREST AND LIFE-THREATENING EMERGENCIES • Identify the signs and symptoms of cardiac arrest, including unresponsiveness, no breathing, or only gasping. • Recognize the signs of respiratory distress, choking, and sudden collapse. • Demonstrate how to quickly assess responsiveness and breathing in an adult. • Perform a rapid scene assessment to ensure safety before starting CPR. 3. APPLY THE ADULT CHAIN OF SURVIVAL • Explain each link in the Adult Chain of Survival: 1. Early recognition and call for help (activation of emergency response). 2. Early CPR with emphasis on chest compressions. 3. Rapid defibrillation (use of AED). 4. Effective advanced life support. 5. Integrated post-cardiac arrest care. • Discuss how teamwork and communication improve outcomes during resuscitation. 4. DEMONSTRATE HIGH-QUALITY ADULT CPR • Describe and demonstrate the correct sequence of CPR (C–A–B): C – Circulation (Compressions) A – Airway B – Breathing • Perform chest compressions at the correct: ° Depth: 2 inches (5 cm) ° Rate: 100–120 compressions per minute • Allow full chest recoil after each compression. • Deliver effective rescue breaths using mouth-to-mouth or barrier device: ° Ratio: 30 compressions to 2 breaths ° Each breath should last 1 second, with visible chest rise. • Minimize interruptions in chest compressions to less than 10 seconds. 5. USE AN AUTOMATED EXTERNAL DEFIBRILLATOR (AED) EFFECTIVELY • Identify when an AED should be used in an unresponsive, pulseless adult. • Demonstrate how to operate an AED safely: 1. Turn on the device. 2. Attach electrode pads correctly. 3. Ensure no one touches the patient during analysis or shock delivery. 4. Follow AED prompts and resume CPR immediately after shock. • Understand safety precautions during AED use (avoid water, metal contact, or touching the victim during shock). 6. PERFORM BLS IN TEAM RESUSCITATION • Explain the roles of team members during adult CPR (compressor, ventilator, AED operator, leader). • Communicate clearly and perform coordinated tasks to ensure efficient resuscitation. • Demonstrate proper rotation of rescuers every 2 minutes to prevent fatigue. 7. MANAGE SPECIAL RESUSCITATION SITUATIONS • Apply BLS principles in: • Drowning victims • Trauma cases • Electrocution • Pregnant patients • Suspected spinal injury • Modify resuscitation steps appropriately in each case. 8. UNDERSTAND ETHICAL AND SAFETY CONSIDERATIONS • Recognize situations when CPR should not be initiated (e.g., obvious signs of death, DNR order). • Follow infection control measures: use of gloves, masks, and barrier devices. • Ensure personal and environmental safety during resuscitation. 9. EVALUATE THE EFFECTIVENESS OF RESUSCITATION • Identify signs of effective CPR (chest rise, pulse return, patient movement). • Recognize Return of Spontaneous Circulation (ROSC) and transition to post-cardiac arrest care. • Know when to stop CPR (e.g., victim recovers, rescuer exhaustion, arrival of advanced help). 10. BUILD CONFIDENCE IN EMERGENCY RESPONSE • Develop quick decision-making skills in emergencies. • Build confidence to perform CPR effectively without hesitation. • Understand that any attempt at resuscitation is better than none.

Introduction The 2020 American Heart Association (AHA) Guidelines for Basic Life Support (BLS) and Cardiopulmonary Resuscitation (CPR) introduced several important updates based on new scientific evidence and global studies. These changes aim to improve the quality of resuscitation, enhance survival outcomes, and strengthen the continuity of care after cardiac arrest. The emphasis is on early recognition, high-quality CPR, teamwork, and long-term recovery. 1. Continued Emphasis on High-Quality Chest Compressions The 2020 update continues to stress that the quality of compressions directly affects survival chances. 2. Dispatcher-Assisted CPR Emergency dispatchers are now expected to recognize possible cardiac arrest from a phone call and instruct callers to start chest compressions immediately, even if they are untrained. 3. Compression-Only CPR for Lay Rescuers Laypersons who are not trained or who are unwilling to give rescue breaths should perform compression-only CPR. 4. Updated Adult Chain of Survival The 2020 guidelines revised the Adult Chain of Survival to include a new link focused on recovery and rehabilitation. The addition of “recovery” acknowledges that survival includes not just restoring heartbeat but also ensuring physical and emotional recovery after resuscitation. 5 Airway Management and Ventilation The recommended CPR sequence remains C–A–B (Compressions–Airway–Breathing). 6. Preference for IV Access Over IO Access During resuscitation, intravenous (IV) access is now preferred for medication delivery. better drug circulation and outcomes. 7. Use of Feedback and Monitoring Devices The 2020 guidelines encourage the use of real-time feedback devices to ensure high-quality CPR. 8. Cardiac Arrest in Pregnancy 9. Post-Cardiac Arrest Care and Neuroprognostication The 2020 guidelines place strong emphasis on post-cardiac arrest care to improve neurological recovery. 10. Double Sequential Defibrillation Not Recommended Current evidence does not show clear benefits, and it may increase the risk of equipment damage or injury. 11. Team Dynamics and Communication The guidelines reaffirm the importance of effective teamwork and communication during resuscitation. 12. Ethical and Safety Considerations The 2020 update emphasizes rescuer safety, infection prevention, and ethical practice: Note: The 2020 BLS/CPR updates highlight that survival from cardiac arrest depends on early recognition, immediate high-quality CPR, rapid defibrillation, and effective post-resuscitation care. Compression-only CPR for lay rescuers, improved dispatcher guidance, and the focus on recovery are among the most notable advancements. Overall, the updates aim to make CPR simpler, faster, and more effective — ensuring that every rescuer, whether trained or not, can act confidently to save a life.

INTRODUCTION The Chain of Survival refers to the sequence of actions that must be performed quickly and correctly to give a person the best possible chance of surviving a cardiac arrest. Each action (called a “link”) is vital — if any link is weak or delayed, the whole chain becomes ineffective. In an emergency, every second counts, and the strength of the chain depends on how quickly and effectively we act. THE FIVE LINKS IN THE ADULT CHAIN OF SURVIVAL 1. Immediate Recognition of Cardiac Arrest and Activation of Emergency Response 2. Early Cardiopulmonary Resuscitation (CPR) with Emphasis on Chest Compressions 3. Rapid Defibrillation Defibrillation means giving an electric shock to the heart to restore its normal rhythm. Most adult cardiac arrests are due to ventricular fibrillation (VF) or pulseless ventricular tachycardia (VT) — both require a shock to restart the heart. 4. Effective Advanced Life Support (ALS) The goal is to stabilize the victim’s heart, breathing, and circulation to prepare for hospital care. 5. Integrated Post–Cardiac Arrest Care Once the person’s heart starts beating again (ROSC – Return of Spontaneous Circulation), care continues in the hospital. THE PEDIATRIC CHAIN OF SURVIVAL (Used for children and infants) 1. Prevention of cardiac arrest 2. Early CPR 3. Prompt activation of emergency response 4. Effective advanced life support 5. Integrated post–cardiac arrest care Note: Most cardiac arrests in children result from breathing problems or shock, not sudden heart failure — so prevention and early CPR are the most important steps.

INTRODUCTION BASIC LIFE SUPPORT (BLS) refers to the immediate care given to a person experiencing life-threatening emergencies such as cardiac arrest, respiratory arrest, or airway obstruction, before advanced medical help arrives. It focuses on maintaining circulation, airway, and breathing (the “CAB” sequence) to preserve vital organ function until more definitive treatment is provided. DEFINITION Basic Life Support (BLS) is a set of techniques and procedures used to support and maintain breathing and circulation in a person whose heart or breathing has stopped or is inadequate. It includes recognition of cardiac arrest, activation of emergency response, and immediate initiation of high-quality CPR and early defibrillation when indicated. *OBJECTIVES OF BLS* 1. Preserve life – sustain breathing and circulation until professional help arrives. 2. Prevent deterioration – stop the condition from worsening. 3. Promote recovery – support vital organ function and buy time for advanced care. 4. Provide comfort and reassurance to the patient if conscious. THE PRINCIPLES OF BASIC LIFE SUPPORT: BLS principles revolve around early recognition, early response, and effective intervention. These are often described using the Chain of Survival, the ABCs (or CAB) of resuscitation, and high-quality CPR principles. 1. EARLY RECOGNITION & ACTIVATION OF EMERGENCY RESPONSE 2. THE “CAB” SEQUENCE The current resuscitation guidelines (2020 AHA) emphasize C – A – B, meaning: ✓ Open the airway using the head-tilt, chin-lift technique. ✓ If trauma is suspected, use jaw-thrust maneuver without tilting the head. ✓ Ensure airway is clear of foreign objects or secretions. B – Breathing ✓ Give 2 rescue breaths after every 30 compressions (for trained rescuers). ✓ Each breath should last 1 second, making the chest visibly rise. ✓ Avoid excessive ventilation. ✓ If you cannot provide rescue breaths, continue hands-only CPR until help arrives. 3. HIGH-QUALITY CPR PRINCIPLES High-quality CPR improves the chances of survival and neurological recovery. Key components include: 1. Start compressions quickly – within 10 seconds of recognition of cardiac arrest. 2. Push hard and fast – maintain correct rate and depth. 3. Allow full chest recoil after each compression. 4. Minimize interruptions in chest compressions. 5. Avoid excessive ventilation. 6. Rotate rescuers every 2 minutes to prevent fatigue. 7. Use AED as soon as it is available. 4. EARLY DEFIBRILLATION Defibrillation is critical in cardiac arrest due to ventricular fibrillation (VF) or pulseless ventricular tachycardia (VT). The AED analyzes the heart rhythm and delivers a shock if needed. Steps: 1. Turn on AED. 2. Apply pads to the patient’s bare chest. 3. Follow the voice prompts. 4. Ensure no one touches the patient during analysis and shock delivery. 5. Resume CPR immediately after the shock. 5. TEAMWORK IN BLS • BLS can be performed by a single rescuer or a team. • In a team setting, effective communication, role assignment, and coordination are vital. Example roles: one person gives compressions, another manages the airway, and another operates the AED. 6. THE CHAIN OF SURVIVAL. The Chain of Survival represents the essential links that increase survival from sudden cardiac arrest. For Adults: 1. Early recognition and activation of EMS. 2. Early CPR with an emphasis on chest compressions. 3. Rapid defibrillation (AED use). 4. Effective advanced life support (ALS). 5. Post-cardiac arrest care. For Children and Infants: 1. Prevention of arrest. 2. Early CPR. 3. Activation of EMS. 4. Effective advanced life support. 5. Post-cardiac arrest care. Each link is vital — a weak or delayed link reduces survival chances. 7. BREATHING AND AIRWAY MANAGEMENT If breathing is absent or abnormal (gasping only): Give rescue breaths using: • Mouth-to-mouth, • Mouth-to-mask, or • Bag-valve-mask (BVM) device if trained. Rescue Breathing Rates: Adult: 1 breath every 6 seconds (10 breaths per minute) if pulse present. Child/Infant: 1 breath every 2–3 seconds (20–30 breaths per minute) if pulse present. 8. RECOVERY POSITION • If the victim is breathing normally and has a pulse but is unconscious, place in the recovery position. • This helps keep the airway open and prevents aspiration. • Keep the head tilted slightly back and body supported on the side. 9. SAFETY CONSIDERATIONS • Ensure the scene is safe before approaching the victim. • Use personal protective equipment (PPE) – gloves, face shields, or masks. • Avoid unnecessary exposure to body fluids. • Do not perform mouth-to-mouth if not safe — use barrier devices. 10. SPECIAL SITUATIONSBLS • principles remain the same but adapt in special cases: - Drowning: give 2 rescue breaths before compressions. - Trauma: maintain spinal alignment; use jaw-thrust for airway. - Pregnancy: compress slightly higher on the chest and displace the uterus to the left. - Obesity or chest deformity: ensure proper hand placement and depth. 11.POST-RESUSCITATION CARE After Return of Spontaneous Circulation (ROSC): • Monitor airway, breathing, and circulation continuously. • Place patient in recovery position if breathing independently. • Provide oxygen, monitor vital signs, and prepare for transfer to advanced care. SUMMARY BLS is the foundation of emergency resuscitation. Focus on CAB – Compressions, Airway, Breathing. Early recognition, early CPR, and early defibrillation are key. Maintain high-quality CPR with minimal interruptions. Ensure scene safety, teamwork, and effective communication. Proper and timely BLS can double or triple the chance of survival after cardiac arrest.

INTRODUCTION While the basic steps of Adult Basic Life Support (BLS) are generally the same, certain special situations may require adjustments in technique or decision-making. Understanding these considerations ensures that resuscitation efforts remain safe, effective, and tailored to the patient’s condition or environment. 1. CPR IN PATIENTS WITH TRAUMA • In trauma cases (e.g., road accidents, falls, head injuries), assume spinal injury until proven otherwise. • When opening the airway, use the jaw-thrust maneuver instead of the head-tilt, chin-lift, to reduce neck movement. • If spinal immobilization devices (e.g., cervical collar) are in place, continue compressions and ventilation as best as possible. • Control severe bleeding quickly using direct pressure. • Do not delay CPR for minor injuries or dressing application. • If there is massive chest or abdominal injury, compressions may be less effective but should still be performed. 2. CPR IN DROWNING OR NEAR-DROWNING VICTIMS • The primary problem is respiratory arrest due to lack of oxygen, not cardiac arrest. • Start with 2 rescue breaths before chest compressions. • Ensure the airway is clear of water and debris. • If possible, perform CPR immediately at the scene, even in shallow water (after ensuring rescuer safety). •. Dry the chest quickly before attaching AED pads. • Hypothermia may be present — handle the victim gently and continue resuscitation longer than usual, as recovery can occur even after prolonged submersion in cold water. 3. CPR IN PREGNANT WOMEN • Cardiac arrest during pregnancy is rare but critical. • Perform standard compressions, but position the woman slightly tilted to her left side (about 15–30 degrees) to prevent the uterus from compressing major blood vessels. • If possible, manually displace the uterus to the left during CPR. • Use the same compression depth (at least 2 inches / 5 cm). • AED use is safe in pregnancy — do not hesitate to apply pads and deliver shocks. • If available, prepare for possible emergency delivery after resuscitation. 4. CPR IN OBESE (OVERWEIGHT) PATIENTS • Chest compressions may require greater force to achieve adequate depth. • Ensure correct hand placement (center of chest, lower half of sternum). • Maintain full recoil and avoid leaning on the chest. • Use longer pads or adjusted placement for AED if standard positions are difficult. • Monitor rescuer fatigue closely — alternate compressors if a second rescuer is present. 5. CPR IN OPIOID OVERDOSE OR POISONING • Victims may have slow or absent breathing but still have a pulse initially. • Check for pulse carefully; if absent, begin CPR immediately. • If naloxone (Narcan) is available, administer it as soon as possible (intranasal or IM). • Continue BLS procedures even after naloxone — breathing and heart rate may take time to normalize. • AED use remains appropriate. 6. CPR IN ELECTROCUTION • Ensure the power source is turned off before touching the victim. • Begin CPR immediately once the scene is safe. • Look for burn entry and exit wounds and treat as necessary. • AED can be used safely once contact with electricity is eliminated. • Victims of electric shock may have underlying arrhythmias, so rapid defibrillation is critical. 7. CPR IN HYPOTHERMIA • Victims are usually cold, pale, and unresponsive, but may still have slow, faint pulses. • Check pulse carefully for up to 10 seconds before starting CPR. • Begin CPR if no definite pulse is found. • Handle the victim gently — rough movements can trigger dangerous heart rhythms. • Remove wet clothing and start gradual rewarming. • AED use is safe, but shocks may be less effective until the body warms up. • Continue resuscitation efforts longer than usual; “no one is dead until they are warm and dead.” 8. CPR IN CHEST TRAUMA OR LUNG INJURY • Victims with rib fractures or chest injuries still require CPR — continue compressions even if ribs crack. • Ensure proper hand placement and adequate depth. • Be prepared for ineffective ventilation due to lung injury; maintain high-quality compressions. 9. CPR IN ENVIRONMENTAL HAZARDS • In fire or toxic gas exposure: Move the victim to fresh air before starting CPR. • In flooding or cold weather: Ensure rescuer safety first. • In confined spaces: Use alternative compression positions if standard kneeling is not possible. 10. DO NOT RESUSCITATE (DNR) OR TERMINATION DECISIONS • If there is a valid DNR order, CPR should not be started. • In clinical settings, follow your facility’s ethical and legal policies. • In the community, when unsure, start CPR — it is better to act than delay. SUMMARY Special situations require adaptation of BLS techniques, but the fundamental goal remains the same — to restore oxygen delivery and circulation to vital organs. Always: • Ensure scene safety first. • Adjust airway and compression techniques as needed. •Apply AED as soon as possible. • Continue CPR until help arrives or the victim recovers.

STEP-BY-STEP PROCEDURE FOR ONE-RESCUER BLS/CPR FOR ADULTS 1. ENSURE SCENE SAFETY • Before approaching, check the environment for hazards (fire, traffic, electricity, fluids, etc.). • Make sure it is safe for both you and the victim. 2. CHECK FOR RESPONSIVENESS • Tap the victim’s shoulders and shout: “Are you okay?” • If there is no response, proceed immediately. 3. CALL FOR HELP AND ACTIVATE EMS • Shout for help if others are nearby. • If you are alone, call emergency services (e.g., 112 or 911) using your phone’s speaker mode. • If an AED is available, bring it immediately. 4. CHECK FOR BREATHING AND PULSE (NO MORE THAN 10 SECONDS) • Open the airway using the head-tilt, chin-lift method. • Look, listen, and feel for normal breathing (not gasping). • At the same time, check the carotid pulse on one side of the neck. • If no normal breathing and no pulse, start CPR immediately. • If normal pulse but not breathing, give 1 rescue breath every 5–6 seconds. 5. BEGIN CHEST COMPRESSIONS HAND POSITION • Place the heel of one hand on the center of the chest (lower half of the sternum). • Place the other hand on top, interlocking the fingers. • Keep your shoulders directly over your hands. • Keep your elbows straight. COMPRESSION TECHNIQUE • Push hard and fast at a rate of 100–120 compressions per minute. • Depth: At least 2 inches (5 cm) but not more than 2.4 inches (6 cm). • Allow full chest recoil after each compression. • Minimize interruptions in compressions (less than 10 seconds). 6. PROVIDE RESCUE BREATHS (AFTER 30 COMPRESSIONS) AIRWAY MANAGEMENT • Use head-tilt, chin-lift to open the airway. • If spinal injury is suspected, use jaw-thrust (without head tilt). 7. USE OF AED (IF AVAILABLE) 1. Turn on the AED immediately. 2. Expose the victim’s chest and attach pads (one on the upper right chest, the other on the lower left side). 3. Follow the voice prompts from the AED. 4. Ensure no one touches the victim during rhythm analysis. 5. If shock advised, clear the area and deliver the shock. 6. Immediately resume CPR for 2 minutes before the next rhythm check. 8. CONTINUE CPR UNTIL • The victim shows signs of life (movement, breathing, pulse). • EMS arrives and takes over. • You are too exhausted to continue. • An AED instructs you to stop. 9. QUALITY CHECKPOINTS • Compression rate: 100–120/min. • Compression depth: 5–6 cm (2–2.4 inches). • Full chest recoil. ✓ Minimize pauses (<10 seconds). ✓ Avoid excessive ventilation. 10. COMMON ERRORS TO AVOID • Shallow compressions. • Leaning on the chest (not allowing recoil). • Inconsistent rate or rhythm. ,• Delays between compressions and breaths. • Forgetting to call for help or use AED early