test 2 Flashcards
Structures involved in the digestive system
Mouth Teeth Tongue Pharynx Esophagus Stomach Small intestine Large intestine Anus
Accessory organs Digestion
Salivary gland
Liver
Gallbladder
Pancreas
Mouth
First part of the digestive tract
Contains tongue and teeth and receives secretions from the salivary glands
Tongue composed of mostly skeletal muscle; the most movable organ of the mouth
Adults have 32 permanent teeth
Cuspids, incisors, bicuspids, and molars
Mouth
Receives food and breaks it down into smaller pieces; mixes food with saliva and starts the digestive process
Parotid glands
Largest salivary glands One on each side Located anterior and inferior to the ear Secrete saliva into the mouth Begins digestion of starches
Pharynx
Connects the nasal and oral cavities to the esophagus; food is forced into the pharynx by the tongue
Esophagus
Muscular tube approximately 20 cm long
Propels food into the stomach from the pharynx using muscular contraction
Lining secretes mucus
Stomach
Located in the upper-left quadrant of the abdomen; has a capacity of approximately 1.5 L/ Has two sphincters Is a temporary storage place for food Mixes food with digestive juices Changes food into a semiliquid state Begins the digestion of proteins Absorbs vitamin B12
Small intestine (duodenum, jejunum, ileum):
Small intestine (duodenum, jejunum, ileum): mixes food with secretions from liver and pancreas; finishes digestion; absorbs nutrients
Large intestine
(ascending, transverse, descending, and sigmoid colon; rectum; anus; cecum): absorbs fluid and electrolytes; eliminates waste products
Liver and gallbladder
concentrate, store, and secrete bile into the duodenum
Pancreas
: secretes digestive juices; produces insulin
Aging on Gi tract
Dental caries and tooth loss Decreased gag reflex Decreased sense of tasteDecreased muscle tone at sphincters Decreased gastric secretions Decreased peristalsis
Metabolism
Process in which large molecules are broken down into smaller molecules
Makes energy available to the organism
Enables absorbed nutrients to enter bloodstream following digestion
Digestion converts food into chemical substances such as proteins and simple sugars to be used by the body for energy production and cellular metabolism
USDA Pyramid
Emphasizes fruits, vegetables, whole grains, and fat-free or low-fat milk and milk products
Includes lean meats, poultry, fish, beans, eggs, and nuts
Is low in saturated fats, trans fats, cholesterol, sodium, and added sugars
Protein
Constant supply essential for rebuilding and replacing body tissues Plays a role in hormone production, fluid balance, antibody production, and transportation of nutrients Supplies approximately 4 calories/g Composed of amino acids 9 essential 11 nonessential Animal sources Plant sources
Protein amount
Average DRI
Protein intake should be 10% to 15% of the total daily calories
May vary depending on activity level, state of health, and availability of protein food sourcesProtein deficiency
Marasmus
Kwashiorkor
Protein excess
Stressful to the liver and kidneys
Kidneys must rid the body of excess waste products
Liver function is strained with the excess load of protein to metabolize
Can lead to excess fat in the diet
Vegetarian Diets
Lacto-ovo-vegetarian- can have eggs and milk
Lactovegetarian no eggs or dairy
Vegan
vegetarian diets health
Well-planned vegetarian diets offer health benefits
Decreased risk of heart disease, hypertension, diabetes, and obesity
Vegans may have a diet deficient in
Vitamin B6, vitamin B12, iron, zinc, riboflavin, and vitamin D
Carbohydrates
The body’s main source of energy Should make up 50% to 60% of the daily diet Supply 4 calories/g Regulate protein and fat metabolism, fight infection, and promote growth of body tissues Three main types: Simple complex fiber
Simple carbohydrates
Glucose is the metabolized form of sugar found in the body and is found in:
Table sugar, the major sweetener found in foods
Fruit sugar
Milk sugar
Quickly absorbed into the bloodstream
Cause a quick rise in serum glucose
Complex carbs
Breads, pasta, cereals, and rice
Broken down into simple sugars for use by the body
Provide a more consistent serum glucose level than simple sugars provide
Recommended that 85% to 95% of consumed carbohydrates are complex carbohydrates
Fiber Carbs
The portion of the carbohydrate that cannot be broken down during digestion Passes through the intestine undigested Increases bulk in the stool Aids in elimination May decrease absorption of fat Recommended intake:
Fats
An essential nutrient
Supplies a concentrated form of energy
Supplies 9 calories/g consumed
Provides source of fatty acids
Adds flavor to foods and contributes to texture
Dissolves and transports fat-soluble vitamins and fat-soluble phytonutrients (carotenoids)
Insulates and controls body temperature
Makes food smell appetizing
Cushions and protects body organs
Facilitates transmission of nerve impulses
Gives feeling of fullness after eatingMade up of fatty acids and glycerol
Fatty acids are classified as saturated or unsaturated
Fatty liquids at room temperature are called oils
Oils containing unsaturated fats:
Corn oil, safflower oil, canola oil
omega 3’s
The most unsaturated form of fatty acid
Found in salmon, halibut, sardines, tuna, canola oil, soybean oil, chicken, eggs, and walnuts
Should be added to the diet as sources of unsaturated fats
HDL
LDL
Triglycerides
Vitamins
Essential nutrients that must be taken in through food sources or supplements
Water-soluble vitamins
Easily absorbed into the bloodstream for use by the body
B-complex vitamins and vitamin C
Fat-soluble vitamins
Absorbed in the small intestine the same as other fats by action of bile in the duodenum and stored in the liver
A, D, E, and K
minerals
Inorganic substances found in animals and plants
Essential for metabolism and cellular function
Major minerals
Calcium, magnesium, sodium, potassium, phosphorus, sulfur, chlorine
Trace minerals
Iron, copper, iodine, manganese, cobalt, zinc, molybdenum, selenium, fluoride, chromium
Water
Water is the most essential of all nutrients
Water requirement is 1 mL/calorie of intake
Used in every body process, from digestion to absorption to elimination or secretion; large amount must be stored in the body
General rule: intake needs to be equal to recorded output plus 500 mL
Factors effecting nutrition
Age: infants, toddlers, preschool, school-age, adolescents, adults, older adults
Illness
Emotional status
Economic status
Religion: Islam, Judaism, Seventh-Day Adventist
Culture: African American, Hispanic, Asian
Assessment, Nursing Diagnosis, Planning
Implementation, Teaching
Evaluation
Infants nutrition
Birth Weight
Breast milk recommended
Formulas
Modified form of cow’s milk, made more digestible with added carbohydrate and fat content
Solids introduced in diet at 4 to 6 months
Preschool /toddler
Ages 2 to 5 years
Consume less milk and increase intake of solids
Provide small servings
Offer foods that are easy to chew
Avoid combination foods
Toddlers prefer single-item foods that do not touch each other on the plate
Try colorful foods (e.g., peas, carrots)
Provide a pleasant environment at mealtimes
Provide plates and utensils in a size that can be easily handled by a small child
Use dishes that are colorful and/or contain pictures of favorite characters
Avoid forcing a child to eat
School age child
May desire sweet, non-nutritive foods such as soda, candy, cake, and ice cream
Provide well-balanced breakfast before school
Provide nutritious after-school snacks
High-calorie, high-sodium preferences may predispose to obesity
Adolescents
Tend to consume many fast foods, either from restaurants or vending machines
During growth spurt the body requires more calories as well as nutrients
Adolescent females require increased levels of iron after the menstrual cycle begins
Adulthood
Rely on fast foods and convenience foods Obesity and hypertension prevalent Have increased fat and sodium intake Have increased sugar intake Lack exercise
Older adults
Most at risk for inadequate nutrition
May need to decrease calories if activity level is decreased
Physical limitations make food preparation more difficult
Arrange for companionship during meals
Some older adults have limited incomes and must limit food choices
Teaching Patients prior to discharge
Nurses teach patients about their:
- Disease or disorder
- Diet and medications
- Treatment and self-care
- Prior to discharge, the patient must be taught how to care for himself at home
* Patient teaching begins at time of admission. -Preventing illness or promoting wellness
Factors that affect teaching
Cultural values, confidence and abilities, readiness to learn
Prior to teaching patients you should
-Do an Assessment of patient learning needs
Prepare a plan, assess learning needs
-Form a teaching plan
Collaborate with other health professionals
Modes of learning include
-Visual learning Through what they see -Auditory learning Through what they hear -Kinesthetic learning By actually performing a task or handling items
To prepare a teaching plan, assess patient for:
Knowledge of his disease
Diet (if related to disease or condition)
Activity regimen or limitations
Medications (prescription and OTC)
Self-care at home
Prioritize learning needs so you can concentrate on teaching essential knowledge first
Factors that effect learning
Assess for factors that might interfere with the patient’s ability to learn
Poor vision or hearing, impaired motor function, illiteracy, and impaired cognition
Age may interfere with the strength or dexterity for performing certain tasks
Special Considerations for Teaching the Elderly LEARNING
Provide good lighting
Provide printed teaching materials in large type
Encourage patient to wear glasses if needed
Encourage patient to wear and adjust hearing aids
Use short sentences and pause frequently
Keep medical terms to a minimum
Ask questions at frequent intervals
Cultural learning
Need to work within patient’s values and cultural system. Values and expectations can interfere with patient’s ability to cooperate and learn needed skills for self-care. The patient’s cultural values and personal expectations regarding treatment and recovery may differ from those of the nurse and other health care providers.
It is important to plan patient teaching that respects and demonstrates understanding of cultural and religious beliefs. If not, it is unlikely to be accepted by the patient.
Confidence and Abilities Teaching
- Often patients express a lack of self-confidence.
- Teaching may need to be broken down into very small steps .
- Assess what patients already know about the skills they need to learn so that you can build on their current knowledge base.
Patients readiness to learn
- Assess patient’s readiness to learn.
- Motivation plays a large role in effective learning.
- Work with patients to show them the advantages of learning what they need to know.
The Teaching Plan
- Preparing the teaching plan includes:
- Analyzing assessment data
- Establishing behavioral objectives
- Creating a plan to assist patient in reaching the goals in a timely and effective manner
- Essential that teaching plan be developed collaboratively, with input from all of the disciplines involved in the patient’s care(Interdisciplinary)
Resources for Teaching
- Books, audiovisual materials, pamphlets, and hands-on equipment
- Local government agencies often provide printed and online listings of community public service programs
- Hospital social workers and patient representatives also good sources of information
Implementing the plan (teaching)
- Teaching done when visitors, physician rounds, and treatments will not cause interruptions
- One-on-one or in a group setting
- Patient should be comfortable
- Keep teaching session short
- Involve patient in the process
- You may need to incorporate teaching into daily care
Evaluation of teaching
- Involves obtaining feedback from the patient regarding what was taught
- Use this feedback to determine whether effective learning has in fact taken place
Documenting patient teaching
- Every staff nurse legally responsible for providing patient education: documentation is essential
- Patient education flow sheet may be used
- Nurse’s notes should include:
- Specific content taught
- Method of teaching used
- Evidence of evaluation with specific results
Coordination with discharge planning (teaching)
- Specific learning needs should be discussed with all involved parties, including the patient, and the plan for teaching shared
- Primary physician’s office
- Home health services
- Family or significant others
- Printed plan must be sent home with the patient
Infection
-Infection: entry into the body of an infectious agent (a microorganism) that then multiplies and causes tissue damage
-Pathogens: microorganisms capable of causing disease
-Some microorganisms produce toxins and others release endotoxins
Infection may result in illness and disease
Organisms Causing Pathology
- Bacteria
- Prions
- Viruses
- Protozoa
- Rickettsias
- Fungi
- Helminths
- Others—mycoplasmas, Chlamydia
Bacteria
-Single-celled microorganisms lacking a nucleus
-Reproduce every few minutes up to several weeks
-Classified according to need for oxygen, shape, and gram stainingNeed for oxygen
Aerobic: Anaerobic:
-Gram staining
-Gram-positive bacteria-Gram-negative *bacteria Shape
Cocci: spherical shape
Bacilli: Rod shaped
Spirochetes: Spiral
Importance of Bacterial identification
- Identified by chemical testing and growing cultures
- Sensitivity testing determines which antibiotic can kill the organism
- Some are drug-resistant
MOST MULTI-DRUG resistant bacteria
Multidrug-resistant organisms
- Methicillin-resistant Staphylococcus aureus (MRSA)
- Vancomycin-resistant Enterococcus (VRE)
- Extended-spectrum beta-lactamase–producing (ESBL) gonorrhea GNR (Neisseria gonorrhoeae)
- Clostridium difficile (C. diff)
- Penicillin-resistant Streptococcus pneumoniae
PRIONS
- Protein particles that lack nucleic acids and are not inactivated by usual procedures for destroying viruses
- Do not trigger an immune response
- Cause degenerative neurologic disease, such as variant Creutzfeldt-Jakob disease (mad cow disease)
VIRUSES
- Extremely small; seen only with an electron microscope
- Composed of particles of nucleic acids, either DNA or RNA, with a protein coat
- Grow and replicate only within a living cell; survival and replication depend on host tissue
Protozoa
-One-celled microscopic organisms belonging to the animal kingdom
-Examples of pathogenic protozoa
Plasmodium species: causes malaria
Entamoeba histolytica: causes amebic dysentery
Other strains capable of causing diarrhea
RICKETTSIA
- Small round or rod-shaped organisms
- Transmitted by the BITES of FLEAS, LICE,MICE, and TICKS
- Can multiply only in host cells
- Causes Rocky Mountain spotted fever and typhus
FUNGI
- Tiny primitive organisms of the plant kingdom that contain no chlorophyll
- Include yeast and mold
- Feed off living animals and decaying organic matter
- Reproduce by use of spores
- Cause candidiasis and tinea pedis (athlete’s foot)
HELMINTHS
- Parasitic worms or flukes
- Belong to the animal kingdom
- Pinworms, which mostly affect children, most common helminths worldwide
- Roundworms and tapeworms are other helminths
Mycoplasmas
Very small organisms without a cell wall
Cause infections of respiratory or genital tract
Example: Mycoplasma pneumoniae
Chlamydia
Affects the genitourinary and reproductive tracts
Increasingly more common in the past 20 years
Process of INFECTION
An infectious disease is spread from one person to another; a continuous chain
LINKS in the CHAIN OF INFX
Causative agent (link 1) Reservoir (link 2) Portal of exit (link 3) Mode of transfer (link 4) Portal of entry (link 5) Susceptible host (link 6)
Causative agent LINK 1 in chain of INFx
- Any microorganism or biologic agent capable of causing disease..Bacteria, viruses, protozoa, rickettsias, fungi, helminths
- Virulence of the agent is affected by its ability to:
- Adhere to mucosal surfaces or skin
- Penetrate mucous membranes
- Multiply once in the body
- Secrete harmful enzymes or toxins
- Resist phagocytosis
Reservoir (Link 2) chain of infx
-Places where microorganisms are found
Infected wounds, human or animal waste, animals and insects, contaminated food and water, and the person with an infection
-Precautions to prevent the spread of infection
Good hand hygiene
Sterile technique
PORTAL OF EXIT (link 3) chain of infx
-Route by which pathogen leaves its host
-Gastrointestinal tract
Feces may transport the typhoid bacillus from an infected person
-Respiratory tract
-Microorganisms are released with coughing or sneezing
-Measles, mumps, pulmonary tuberculosis can be transmitted by exit from the respiratory tract
Skin and mucous membranes, Open wounds
MODES OF TRANSFER (link 4) chain of infx
-Direct personal contact with body excreta or drainage from an ulcer, infected wound, boil, or chancre
-Indirect contact with contaminated inanimate objects, such as needles, eating utensils, and dressings
-Vectors, such as mosquitoes, that harbor infectious agents and transmit through bites and stings
-Droplet infection, or contamination by the aerosol route through sneezing and coughing
Spread of infection from one body part to another
Portal of ENTRY (link 5) chain of Infx
- Enter the body through eyes, mouth, nose, trachea, skin, mucous membranes
- To prevent entry of microorganisms:
- Use only sterile and clean items in patient care
- Use barrier precautions (gloves, masks, condoms)
- Safely handle food and water
- Use good personal hygiene
- Avoid high-risk behaviors
- Use protection from insect bites and stings
Susceptible host (link 6) chain of infx
- A human host may be susceptible by virtue of:
1. Age
2. State of health
3. Broken skin
Susceptibility of the Elderly INFX
- Factors placing the elderly at risk for infection
- Poor nutrition
- Immobility
- Poor hygiene
- Chronic illness
- Physiologic changes such as thinner skin
BODY DEFENSES AGAINST INFX
-Intact skin is the first line of defense against infection
–Secretions (lysozyme) from mucous membranes lining the respiratory, gastrointestinal, and reproductive tracts
- Cilia
- Kupffer cells
- Gastric secretions
KUPFFER CELL
are specialized macrophages located in the liver lining the walls of the sinusoids that form part of the reticuloendothelial system (RES) (also called mononuclear phagocyte system).
BODY 2nd line of defense against INFX
- Fever: slows growth of many pathogens until other defenses can be mobilized
- Leukocytosis
- Phagocytosis
- Inflammation
- Interferon
Inflammatory response INFX
- Localized protective response brought on by injury or destruction of tissue
- Blood vessels dilate, bring more blood to area, causing redness, warmth, edema
Passive artificially acquired immunity:
1
Artificially acquired immunity:
1
Naturally acquired passive immunity:
1
Passive acquired immunity:
1