Health Science Review: Accidents, Microbes, Vital Signs, and First Aid

Workplace Safety and Regulatory Organizations

• OSHA (Occupational Safety and Health Administration)

  • Definition: A federal agency responsible for enforcing workplace safety standards to ensure human health and safety in the work environment.

  • Main Role: To provide and enforce standards that protect workers from hazards, including physical harm and exposure to chemicals.

• NIOSH (National Institute for Occupational Safety and Health)

  • Primary Focus: Conducts research and makes recommendations for the prevention of work-related injury and illness.

  • Nature of Work: While OSHA is an enforcement agency, NIOSH is primarily focused on research-based guidance.

• Safety Concepts and Information

  • Safety Definition: The state of being free from harm or injury.

  • Safety Data Sheets (SDS): These documents provide comprehensive information regarding chemical hazards and proper safe-handling procedures within a facility.

Microbiology and Infection Control

• Microbiology Fundamentals

  • Microbiology: The scientific study of microscopic organisms.

  • Pathogens: Microorganisms that cause disease or infection.

  • Microbial Types:

    • Aerobic Microbes: Organisms that require oxygen to live and grow.

    • Anaerobic Microbes: Organisms that thrive and live best in the absence of oxygen.

• Methods of Microbial Control

  • Antiseptics: Chemical agents used to reduce pathogens on living tissue, such as the skin.

  • Disinfectants: Chemicals used to kill pathogens on nonliving objects and surfaces; these are generally not safe for direct application to skin (e.g., bleach).

  • Sterilization: The most rigorous level of cleaning, defined as killing all pathogens and spores to ensure an object is completely free of microorganisms.

• Specific Infectious Agents and Bioterrorism

  • Bioterrorism: The intentional use of microorganisms (biological agents) as weapons. These agents can be spread through air, water, or food.

  • Tuberculosis (TB): A highly contagious bacterial infection caused by $Mycobacterium\,tuberculosis$.

  • Hepatitis B: A serious viral infection that affects the liver; it can be prevented through the use of vaccines.

The Chain of Infection and Healthcare-Associated Infections

• Chain of Infection: A series of links required for an infection to occur and spread between hosts.

  • Reservoirs: The places where microorganisms live, thrive, and multiply (e.g., humans, animals, or environmental sources).

  • Fomites: Nonliving objects that carry and potentially transmit infectious microbes (e.g., door handles, medical equipment).

  • Portal of Exit: The site from which pathogens leave the host organism.

  • Mode of Transmission: The specific way a disease or pathogen spreads from one individual to another.

  • Portal of Entry: The site through which pathogens enter a new host.

  • Host: An infected or potentially infected organism.

• Clinical Concepts

  • Contagious: A term used to describe a disease that is easily spreadable to others.

  • Immunity: The state of having resistance to specific pathogens.

  • Healthcare-Associated Infections (HAIs): Infections that patients acquire while they are receiving healthcare for other conditions.

Patient Vital Signs

• Primary Vital Signs:

  1. Pulse.

  2. Temperature.

  3. Blood Pressure.

  4. Breathing Rate (Respiration).

• Temperature:

  • Normal Adult Temperature: Approximately $98.6^{\circ}F$ ($37^{\circ}C$).

  • Fever (Pyrexia): Defined as any body temperature exceeding $100.4^{\circ}F$ ($38^{\circ}C$).

  • Measurement Sites: Commonly measured at the forehead (temporal) and ears (tympanic).

• Pulse (Heart Rate):

  • Normal Adult Resting Range: $60-100\,bpm$.

  • Tachycardia: An abnormally fast heart rate.

  • Bradycardia: An abnormally slow heart rate.

  • Common Sites for Measurement:

    • Radial artery (wrist).

    • Carotid artery (neck).

    • Femoral artery (located in the groin, though sometimes colloquially confused with temporal sites in certain quiz contexts).

  • Factors Increasing Heart Rate: Stress and exercise.

• Respiration (Breathing Rate):

  • Normal Adult Rate: $12-20\,breaths/min$.

  • Tachypnea: Abnormally rapid and shallow breathing.

  • Bradypnea: Abnormally slow breathing.

  • Apnea: A temporary pause or cessation of breathing.

  • Dyspnea: Difficulty breathing or shortness of breath.

• Blood Pressure (BP):

  • Normal Reading: Approximately $120/80\,mmHg$.

  • Systolic Pressure: The pressure exerted on the arteries when the heart beats/contracts.

  • Diastolic Pressure: The pressure on the arteries between heartbeats while the heart is at rest.

  • Hypertension: High blood pressure, typically defined as readings above $140/90\,mmHg$.

  • Hypotension: Low blood pressure.

  • Device: Sphygmomanometer.

• Oxygen Saturation ($SpO_2$):

  • Measurement Tool: Pulse oximeter.

  • Normal Range: $95\%-100\%$.

  • Clinical Warning: A reading of $88\%$ indicates the body is not receiving enough oxygen, requiring immediate medical attention.

• Clinical Significance and Maintenance:

  • Vital signs must be measured regularly to identify underlying health issues.

  • Patients should rest before blood pressure measurement to avoid inaccurate/elevated readings.

  • Dehydration Effects: Can cause a faster heart rate and decreased circulation.

  • Abnormal Findings: Should result in a re-check, contacting a doctor, and running further tests to ensure patient safety and avoid incorrect treatments.

First Aid and CPR Techniques

• Emergency Response Sequence:

  1. Ensure the scene is safe.

  2. Check for responsiveness and breathing.

  3. Call $911$ (or assign someone to call).

  4. Begin CPR/First Aid.

• Adult CPR:

  • Compression Rate: $100-120\,compressions/min$.

  • Compression Depth: Approximately $2\,inches$.

  • Compression-to-Breath Ratio: $30:2$ (single rescuer).

  • Hand Placement: Center of the chest on the sternum.

  • Rescue Breaths: If the chest does not rise, re-tilt the head and try again. Use the head-tilt/chin-lift method.

  • Termination: Stop CPR when the person shows signs of life or emergency responders arrive.

• Infant CPR (Under 1 Year):

  • Responsiveness Check: Tap the bottom of the foot and shout.

  • Compression Technique: Two thumbs in the center of the chest (with hands around the torso) or two fingers below the nipple line.

  • Compression Depth: Approximately $1\frac{1}{2}\,inches$ (or one-third of the chest depth).

  • Rescue Breaths: Cover both the infant's mouth and nose with your mouth.

• AED (Automated External Defibrillator):

  • Use as soon as it is available.

  • Ensure the chest is dry and clear of obstructions.

  • Pediatric Use: If pediatric pads are missing, use adult pads, ensuring they do not touch. Placement for infants is typically one pad on the chest and one on the back.

• Choking Management:

  • Universal Sign: Hands clutching the throat.

  • Conscious Adult/Child: Alternate $5$ back blows and $5$ abdominal thrusts (placed above the navel and below the sternum).

  • Obese or Pregnant Victims: Perform chest thrusts instead of abdominal thrusts.

  • Infant Choking: Sequence of $5$ back slaps (infant face down along forearm, head lower than body) and $5$ chest thrusts.

  • Unconscious Victims: Begin CPR immediately if the choking victim becomes unconscious.

• Injury and Patient Care:

  • Recovery Position: Used for unconscious individuals who are breathing normally to keep the airway open and prevent choking. The head should be tilted backward slightly.

  • Secondary Assessment: A detailed head-to-toe exam performed after stabilizing life threats.

  • Severe External Bleeding: Apply direct pressure with a clean cloth/dressing. If blood soaks through, add more dressings on top (do not remove the first).

  • Tourniquets: Appropriate when direct pressure fails for severe limb bleeding. Place above the wound, between the wound and the heart. A makeshift tourniquet should be wide and tightened until bleeding stops.

  • Wound Packing: Use hemostatic gauze or clean cloth for deep wounds with heavy bleeding, followed by direct pressure.

  • Patient Handling: If a patient begins to fall, guide them to the ground while protecting their head. Use proper body mechanics (bending at the knees).

Suction of Fluids in Patients

• Fundamentals of Suctioning:

  • Medical Suctioning: Clearing a patient's airway of blockages using negative pressure to help them breathe.

  • Fluids Removed: Mucus, spit (saliva), and blood.

  • Types:

    • Oral Suctioning: Removes saliva and particles from the mouth.

    • Tracheal (Airway) Suctioning: Removes blockages and mucus directly from the throat/airway.

  • Primary Goal: To clear the airway so the patient can breathe properly.

• Patient Care and Safety:

  • Indications for Suction: Necessary for conditions like stroke, surgery, or patients in a vegetative state. Symptoms needing intervention include gurgling, delayed/fast breathing, and visible mucus or bubbles at the mouth/nose.

  • Tracheostomy Care: Patients with a tracheostomy require regular suctioning to clear liquid/mucus they cannot expectorate by coughing.

  • Risks: Excessive suctioning can obstruct the airway. Suctioning for too long removes oxygen from the lungs, leading to hypoxia (low blood oxygen levels). It can also cause airway trauma or bleeding.

• Equipment and Infection Control:

  • Suction Machine: A device using negative pressure to extract fluids.

  • Suction Catheter: A flexible hollow tube used with a vacuum device.

  • Standard Supplies: Tubing, collection canister (to trap extracted fluid), gloves, and catheters.

  • Infection Control: Requires hand washing, PPE, and sterile/clean techniques to prevent spreading pathogens or causing infections in the airway.

• Vocabulary:

  • Suction Catheter: A flexible tube used to remove fluids or secretions.

  • Tracheostomy: A procedure used to create an opening in the trachea to assist breathing.

  • Secretions: Bodily fluids such as mucus that may need to be removed.

  • Sterile Technique: Methods used to prevent contamination by microorganisms.

  • Hypoxia: A condition in which the body does not receive enough oxygen.