Exam 1 Study Guide

The Infection Cycle

Infection requires six links, arranged in a loop. Every infection-control measure in the chapter works by cutting one of them, and the exam will ask you which link a given action breaks. Learn the cycle as a sequence of six and attach at least one nursing action to each.

Classifying the agents

Bacteria are the most significant and most prevalent infection-causing agents in health care settings — the lecture deck's first review question turns on exactly this. They are classified three ways: by shape (spherical = cocci, rod-shaped = bacilli, corkscrew = spirochetes); by reaction to Gram stain (gram positive, gram negative); and by oxygen requirement (aerobic = needs oxygen, anaerobic = lives without it). Viruses are the smallest microorganisms and do not respond to antibiotics. Fungi are plant-like organisms — molds and yeasts — present in air, soil, and water. Parasites live on or in a host and rely on it for nourishment. Microorganisms generally require a dark, warm, moist environment.

Two scope terms: an endemic disease occurs with predictability in one specific region or population; a pandemic is a global outbreak of a new or not previously identified organism.

Stages of Infection

Infection moves through four stages, and the exam nearly always asks about the second one.

Body Defenses: Inflammatory and Immune Response

Skin and mucous membranes are the first line of defense; so is normal flora, especially in the gastrointestinal tract, which crowds out harmful bacteria. Anything that breaches these barriers meets the inflammatory and immune responses.

The inflammatory response — two phases

Inflammation neutralizes, controls, or eliminates the offending agent and prepares the site for repair. It fires for injury as well as infection and may be acute or chronic. Its five hallmark signs are redness, heat, swelling, pain, and loss of function — and each traces directly to one of the two phases, which is exactly how the exam will ask it.

The immune response

The antigen is the foreign material; the antibody is what the body produces in reply. The antigen–antibody reaction constitutes humoral immunity. Cell-mediated immunity is characterized by an increase in lymphocytes that destroy or react with cells the body recognizes as harmful. Together they defend against bacterial, viral, and fungal infection and against malignant cells.

Who Gets Infected — Susceptibility, Labs, and HAIs

Factors affecting risk for infection

Intact skin and mucous membranes; normal pH levels; the body's white blood cells; age, sex, and hereditary factors; immunization, natural or acquired; fatigue, climate, nutritional and general health status; stress; and the use of invasive or indwelling medical devices. The very young and the very old are most vulnerable — infants have immature immune systems, and older adults have diminished ones along with thinner skin and blunted febrile responses.

Laboratory data indicating infection

Health care–associated infections

The 2007 CDC guideline marked the terminology shift from nosocomial infection to the broader health care–associated infection (HAI), acknowledging that care is delivered well beyond acute-care hospitals. HAIs may be exogenous (the organism comes from outside the patient) or endogenous (the patient's own flora becomes pathogenic, often after antibiotic therapy disturbs the normal balance). An iatrogenic infection results from a diagnostic or therapeutic procedure. The most common causes are invasive devices, breaks in aseptic technique, and antibiotic overuse.

Preventing the four device- and procedure-related HAIs

Objective W1·7 asks for causes and effects. Each targeted HAI has a small set of nursing actions that prevent it, and the common thread is the same: get the device out as soon as it is no longer needed.

Medical vs. Surgical Asepsis

Asepsis includes all activities to prevent infection or break the chain of infection. It comes in two grades, and telling them apart is an explicitly listed objective.

The numbers that govern a sterile field

Other governing rules: open the far flap first, then each side, then the flap nearest you last, so you never reach across an exposed sterile surface. Grasp each flap only on its outer surface. Never turn your back on or walk away from a sterile field. Moisture wicks organisms upward, so a wet field is a contaminated field. A commercially packaged item is not sterile past its expiration date. Forceps soaked in disinfectant are not sterile — use dry sterile forceps.

Donning sterile gloves — the open method

Your ungloved hand touches only the inside of the folded cuff of the first glove — the surface that will end up against your own skin and never contacts the patient or the field. Once the first glove is on, that gloved hand touches only sterile surfaces: it slides under the folded cuff of the second glove to lift it. Afterwards hold your hands above waist level and in front of you; anything below the waist or out of your sight is contaminated.

Hand Hygiene

Two populations of organisms live on the hands. Transient flora attach loosely to the skin and are removed with relative ease — these are the ones that transmit infection between patients. Resident flora live in the creases of the skin and require friction with a brush to remove.

The WHO Five Moments for Hand Hygiene

Additional CDC points: hands are cleaned promptly whenever visibly soiled, after handling contaminated material, and after removing gloves — gloves are never a substitute for hand hygiene. Artificial nails are barred for personnel giving direct care because of higher bacterial counts, and natural nails stay under ¼ inch.

Personal Protective Equipment

Four items: gloves, gowns, masks, protective eyewear. The order in which you put them on and take them off is a lab competency and a reliable exam item, because the two sequences are not mirror images of each other.

Gloves. Clean nonsterile gloves for contact with blood, body fluids, contaminated items, mucous membranes, and nonintact skin; change between tasks on the same patient as needed; remove promptly and perform hand hygiene. Latex sensitivity ranges from irritant contact dermatitis through delayed hypersensitivity to true immediate anaphylactic reaction; identify it on the admission assessment. Gowns protect clothing when splashing is likely. Masks and eyewear protect the mucous membranes of the eyes, nose, and mouth.

Standard and Transmission-Based Precautions

Tier 1 — Standard precautions

Used in the care of all hospitalized patients regardless of diagnosis or possible infection status. They apply to blood, all body fluids, secretions, and excretions except sweat — whether or not blood is present or visible — plus nonintact skin and mucous membranes. Newer elements folded in are respiratory hygiene and cough etiquette, safe injection practices, and masking for prolonged procedures involving spinal canal puncture.

Core requirements: hand hygiene; clean nonsterile gloves as above; PPE for procedures likely to generate splashes; never recap used needles two-handed — use a recapping device or the one-handed scoop technique if recapping is unavoidable, and place sharps in puncture-resistant containers; single-dose vials and a disposable needle and syringe for each injection; careful handling and reprocessing of soiled equipment; adequate environmental controls; and private rooms for patients likely to contaminate the environment.

Tier 2 — Transmission-based precautions

Layered in addition to standard precautions for patients with suspected or confirmed infection by pathogens spread via airborne, droplet, or contact routes. PPE is donned on entering the room and removed only on leaving. Categories may be combined, since one disease may have more than one transmission route.

The fourth category — protective (reverse) isolation

The three transmission-based categories keep organisms in. Protective isolation, also called a protective environment or reverse isolation, keeps organisms out — it protects a severely immunocompromised patient, classically in the first 100 days after an allogeneic hematopoietic stem cell transplant. The room uses positive pressure with HEPA-filtered incoming air, so air flows out of the room when the door opens. This is the exact mirror of an airborne isolation room, and the contrast is a natural exam item.

What protective isolation restricts. The positive-pressure room is only part of it. Remove fresh flowers and potted plants — standing water and soil harbour Pseudomonas and Aspergillus. Serve only thoroughly cooked food, no raw fruit or vegetables, because produce carries organisms a normal gut would handle. Screen visitors and exclude anyone with symptoms of any infection. And hand hygiene before entering remains the single most important measure.

Handling supplies, linens, and spills

Used equipment is discarded or, if reusable, bagged per policy and routed to central cleaning. Double bagging is indicated only when a single bag is not secure or is soiled externally. A contaminated item is never reused on another patient. Water-soluble linen bags dissolve in hot water so staff never handle contaminated linen. Paper trays and disposable utensils are no longer recommended — they do not stop transmission and commercial dishwashers adequately decontaminate dishes. Body-fluid spills are cleaned immediately with an appropriate germicide. Specimen containers must not be contaminated on the outside and go into sealed plastic bags. A red biohazard bag is used for trash containing liquid or semiliquid blood or other potentially infectious material, trash that would release such substances if compressed, and trash caked with dried blood capable of releasing it during handling.

Choosing a sterilization or disinfection method

Six determining factors: the nature of the organisms present, the number present, the type of equipment, the intended use of the equipment, the available means for sterilization and disinfection, and time.

COVID-19 as the chapter's case study

Because the virus was novel, specific recommendations shifted rapidly while the underlying principles held steady. Early on, with the transmission mechanism unknown, facilities defaulted to standard, contact, and airborne precautions with respirators and isolation rooms; finite supplies forced reuse and crisis planning. As evidence accumulated that spread was predominantly contact and droplet, general interactions moved to droplet precautions with masks and face shields, and respirators were reserved for aerosol-generating procedures — intubation, bronchoscopy, suctioning. Four public recommendations followed directly from core principles: handwashing as the foundation, cloth masks to limit droplet spread while preserving medical-grade supplies, 6-foot distancing, and restrictions on large indoor gatherings.

Nursing Process · Infection

Two of the nine objectives ask you to apply the nursing process, so expect at least one item framed as a scenario rather than a definition.

Classifying what you collect

Subjective data is what the patient tells you — symptoms, sensations, perceptions. Objective data is what you measure or observe. The test is clean: could you have obtained this finding if the patient could not speak? If not, it is subjective. A report of chills is subjective even though it is entirely true; a laboratory value is objective even when it turns out to be wrong — the rule turns on how the finding was produced, not on how factual it feels. So a stated religion, a stated cause of a parent's death, and a self-reported cigarette or alcohol intake are all subjective, and a number attached to a statement does not convert it.

Patient teaching — medical asepsis at home

Wash hands before preparing or eating food; prepare foods at high enough temperatures; wash hands, cutting boards, and utensils before and after handling raw poultry and meat; keep food refrigerated; wash raw fruits and vegetables; use pasteurized milk and fruit juices; wash hands after using the bathroom; use individual care items rather than sharing. Clean technique — not sterile — is acceptable for home wound care, because the reservoir is the patient's own flora.

Occupational exposure

After a needlestick or mucous-membrane exposure: wash the site immediately, report it at once per facility policy, and complete the exposure report so postexposure prophylaxis can be started within the effective window. Prevention rests on sharps-safety devices, never recapping two-handed, and immediate disposal in puncture-resistant containers.

Nomenclature, Preparations, and Classification

Every drug carries four names, and only two of them matter at the bedside. The generic name is assigned by the manufacturer that first develops the drug and derived from the chemical name; it is the name that appears on the MAR. The trade (brand) name is copyrighted by the company that sells it. The chemical name identifies the drug's atomic and molecular structure, and the official name, or monograph, is the name under which the drug appears in official publications — typically the generic name.

Drugs are classified by effect on a body system, chemical composition, or clinical indication. Two classification systems run in parallel: the pharmaceutical class refers to the mechanism of action (MOA), physiologic effect (PE), and chemical structure (CS); the therapeutic class refers to the clinical indication or therapeutic action. A single drug belongs to one of each — furosemide is a loop diuretic (pharmaceutical) and an antihypertensive (therapeutic).

Objective W2·4 asks you to identify various medication classifications and implications for nursing practice. You are not expected to know individual drugs yet — you are expected to know that the classification tells you what to assess before and after.

Core drug knowledge — what you must know before you give anything

Objective W2·3 names the components of core drug knowledge explicitly: pharmacotherapeutics (the intended use), pharmacokinetics, pharmacodynamics, contraindications, precautions, adverse effects, and drug interactions. Two of these are easy to blur: a contraindication is a condition under which the drug must not be given at all — a documented allergy, or an anticoagulant during active bleeding. A precaution is a condition under which the drug may be given with added caution, monitoring, or dose adjustment — the same anticoagulant in an older adult at risk for falls. Recognizing a contraindication and withholding the dose is a nursing responsibility, not a prescriber-only one.

Pharmacokinetics — What the Body Does to the Drug

Four processes, in order, abbreviated ADME.

Factors affecting absorption — the six the lecture deck lists: route of administration, lipid solubility, pH, blood flow, local conditions at the site of administration, and drug dosage. Route drives the speed: intravenous is immediate because absorption is bypassed entirely; then intramuscular, subcutaneous, and oral, which is slowest and most variable.

Two absorption concepts complete the picture. The first-pass effect is the metabolism an orally absorbed drug undergoes in the liver before it reaches the systemic circulation; a drug heavily metabolized on first pass needs a much larger oral dose than IV dose, or must be given by a route that bypasses the liver — which is precisely why sublingual, buccal, and rectal routes exist. Bioavailability is the proportion of the dose that actually reaches the circulation in active form. During distribution, many drugs travel bound to plasma proteins, chiefly albumin; only the unbound (free) fraction is pharmacologically active. A patient with low albumin — malnourished, older, or with liver disease — has more free drug circulating and is at risk of toxicity at an ordinary dose. This is also the mechanism behind a displacement interaction.

Pharmacodynamics — what the drug does to the body

Pharmacodynamics is the process by which drugs alter cell physiology and affect the body. Drugs turn on, turn off, promote, or block responses that are already part of the body's processes — they do not create new functions. A drug–receptor interaction occurs when the drug interacts with one or more cellular structures to alter cell function; drugs may also combine with other molecules, act on the cell membrane, or alter the cellular environment. Pharmacotherapeutics is the desired, intended effect — the reason the drug was prescribed.

Drug Dose and Serum Drug Levels

Adverse Drug Reactions

The therapeutic effect is the desired outcome; everything else on this list is a secondary effect, and the exam distinguishes them by severity and mechanism, not by symptom.

Reporting. Serious ADRs are adverse or sentinel events, documented per facility policy and reported to MedWatch, the FDA's voluntary adverse-event reporting program. Surveillance results in revised labels, added warnings, patient medication guides, market withdrawal, and the Boxed Warning (formerly the Black Box Warning) placed on certain drug labels.

Drug interactions

Factors affecting drug action

Eight, from the lecture deck: developmental considerations, weight, biologic sex, cultural and genetic factors (ethnopharmacology), psychological factors, pathology, environment, and timing of administration. These are the "individual barriers" objective W2·3 names.

Legislation, Orders, and Abbreviations

"Development, safeguards, and delivery of drugs" is its own Week 2 topic bullet. Federal control began with the Pure Food and Drug Act (1906), which first required drugs to meet standards of strength and purity; the Federal Food, Drug, and Cosmetic Act (1938) added a safety requirement after a lethal sulfanilamide elixir, and its 1962 amendment added proof of effectiveness. The Controlled Substances Act (1970) replaced the older Harrison Narcotic Act and created the five schedules, ranked by abuse potential: Schedule I has no accepted medical use, and Schedules II through V carry decreasing potential for abuse and dependence. The FDA enforces all of it. Drug development moves through preclinical testing and then four phases of clinical trial before FDA approval; phase IV is postmarket surveillance, which is where MedWatch feeds back in. Nurses are part of the safeguard chain — the prescriber writes, the pharmacist dispenses and double-checks, and the nurse is the last check before the drug reaches the patient.

Controlled substances are scheduled by abuse potential, stored in a locked system, and counted every shift by two nurses. When a controlled substance is given, the record must include: the name of the patient, the amount used, the hour it was given, the name of the prescribing provider, and the name of the nurse administering it. A wasted portion is witnessed and co-signed by a second nurse.

The seven parts of a medication order: patient's name; date and time the order is written; name of the drug; dosage; route; frequency; and the signature of the person writing the order. If any part is missing, ambiguous, or clinically inappropriate, the nurse does not administer it — the nurse clarifies it with the prescriber and has it rewritten. Objective W2·4 states this outright: evaluate medication orders for clarity and accuracy.

And a PRN order needs an eighth thing — the indication. "Ondansetron 4 mg IV q6h PRN" is incomplete: PRN for what? A PRN order is written against a condition, so the condition has to be on it — "PRN nausea," "PRN pain." The same requirement follows the dose into the record: documenting a PRN dose takes the usual drug, dose, route and time plus the reason it was given plus a reassessment of whether it worked — roughly 30 minutes for an oral dose, sooner for IV. If a dose was withheld, document that it was held and why: a blank space on a MAR is indistinguishable from a forgotten dose.

Medication supply systems

Stock supply (large quantities kept on the unit — immediately available, but it eliminates the pharmacy double-check); individual unit-dose supply; medication cart; computerized automated dispensing system; and the bar-code–enabled medication administration (BCMA) cart, which electronically verifies patient and drug at the bedside.

The Three Checks and the Rights of Medication Administration

The three checks — three readings of the label

The rights

The classic five are medication, patient, dosage, route, and time; documentation is the sixth you must always add. Taylor 10e lists eleven in total — and the instructor’s own deck enumerates these same eleven, in this exact order, so this is emphasised course material rather than textbook trivia; the additional ones ask for nursing judgment rather than label matching, which is exactly what an application-level question tests. In the table below the six core rights are bolded.

Metric conversions you need at the bedside

To convert a larger unit to a smaller unit, move the decimal point to the right; to convert a smaller unit to a larger unit, move it to the left. 1 kilogram = 1,000 grams · 1 gram = 1,000 milligrams · 1 milligram = 1,000 micrograms · 1 liter = 1,000 milliliters (or cubic centimeters). So 1.5 g = 1,500 mg. The graded dosage-calculation exam is separate — the calendar has the date; this much conversion belongs to Ch 30 itself.

Administering Medications by Route

Oral and enteral. Solid forms are tablets, capsules, and pills; liquid forms are elixirs, spirits, suspensions, and syrups. The oral route has the patient swallow the drug; the enteral route delivers it through a feeding tube. Sublingual means under the tongue and buccal means between the tongue and cheek — both bypass the GI tract and the liver's first-pass effect, and neither is swallowed. Enteric-coated, sustained-release, and extended-release forms are never crushed.

Parenteral routes named in the deck: subcutaneous (subcutaneous tissue), intramuscular (muscle), intradermal (corium, under the epidermis), intravenous (vein), intra-arterial (artery), intracardial (heart tissue), intraperitoneal (peritoneal cavity), intraspinal (spinal canal), and intraosseous (bone). Equipment is chosen by five criteria: route of administration, viscosity of the solution, quantity to be administered, body size, and type of medication.

Preparing the injection

A syringe has three parts — the tip (which connects to the needle), the barrel with its calibrations, and the plunger. A needle has the hub, the shaft (cannula), and the bevel, the slanted tip that makes the puncture. The tip, the inside of the barrel, the plunger shaft, and the entire needle are sterile and never touched. Drugs that deteriorate in solution are dispensed as powders and reconstituted immediately before injection with the diluent, type, and amount specified on the label; a reconstituted multidose vial is labeled with the date, time, concentration, and your initials.

When drawing from two containers: with a single-dose and a multidose vial, draw from the multidose vial first so it cannot be contaminated. With an ampule and a vial, prepare the vial first.

Site selection and Z-track

The ventrogluteal site involves the gluteus medius and minimus in the hip. It is recommended for adults because it offers a large muscle mass relatively free of major nerves and blood vessels, is removed from bone, is clean (fecal contamination is rare there), causes less pain, and allows the patient to lie on the back, abdomen, or side. To locate it: place your palm over the greater trochanter with your fingers toward the patient's head — right hand for the left hip, left hand for the right — put your index finger on the anterosuperior iliac spine, extend the middle finger dorsally along the iliac crest, and inject in the center of the resulting triangle.

The deltoid is located by palpating the lower edge of the acromion process; the site is about three finger-breadths below it. It is the recommended site for adult vaccines but risks the radial nerve and artery, and is not developed enough in infants and toddlers. The dorsogluteal is no longer recommended: it is covered by subcutaneous tissue in many people, altering absorption and risking necrosis and abscess, and it lies near the gluteal artery and the sciatic nerve.

The Z-track technique is used for medications that irritate or stain subcutaneous tissue. The skin is pulled laterally before the injection and released after the needle is withdrawn, so the tissue planes slide out of alignment and seal the needle track, preventing the drug from leaking back. Taylor assigns irritating, viscous, and oil-based solutions to the ventrogluteal site by Z-track. Insert with a dart-like motion, wait about 10 seconds so the drug disperses, then withdraw quickly at the same angle and only then release the displaced skin. Never massage a Z-track site — massage forces drug back up the needle track into the subcutaneous tissue the technique exists to protect.

Insulin

Insulin is prepared in an insulin syringe, and no other drug is ever given in one. When mixing two insulins in one syringe: inject air into the cloudy (NPH) vial first, then air into the clear (regular) vial, then withdraw the clear before the cloudy — so no long-acting insulin contaminates the short-acting vial. Rotate sites within one anatomical area for consistent absorption. Heparin is also given subcutaneously, usually in the abdomen, avoiding a 2-inch radius around the umbilicus; enoxaparin comes prefilled with an air bubble that is not expelled.

Intravenous. Delivers the drug directly into the bloodstream, so the effect is immediate and cannot be recalled or slowed — this makes IV the most dangerous route and the one used in most emergencies.

Enteral, topical, and inhaled routes

The Weeks 2–3 skills-lab objectives name these individually, so know the one distinguishing detail for each.

Using a metered-dose inhaler — the sequence

Shake and attach the spacer — exhale fully, away from the spacer — press the canister and inhale slowly and deeply — hold the breath about 10 seconds — rinse the mouth with water and spit. Exhaling first makes room for the breath that carries the drug in; the breath-hold lets the particles settle rather than being blown straight back out. Wait about 1 minute between puffs of the same medication.

Documentation, Errors, and the Nursing Process

What goes in the record

Name and dosage of the medication; route and time of administration; name of the person administering it; site used for an injection; location of a topical or transdermal application; which naris, eye, or ear was used; intentionally or inadvertently omitted drugs; refused drugs; and medication errors. Documentation happens after administration.

Types of medication error

Inappropriate prescribing of the drug; extra, omitted, or wrong doses; administration to a patient for whom the drug was not ordered; administration by an incorrect route or rate; failure to give within the prescribed time interval; incorrect preparation; improper technique; and giving a drug that has deteriorated.

Errors cluster at transitions in care — admission, transfer between departments, and discharge — and the principal cause is incorrect or incomplete transfer of medication information. This is why medication reconciliation exists, and nurses are usually the ones maintaining the list.

Also reportable: near-misses (an error that almost occurred — voluntary in some settings) and sentinel events (serious patient harm or death), plus external reporting through MedWatch and the NCC MERP. Reporting is framed as collaborative improvement, not punishment: it prevents repetition and tracks patterns across the institution.

Nursing process · medications

Patient teaching

Review the technique of administration; take the medication as prescribed for as long as prescribed; do not alter dosages without consulting the prescriber; do not share medications; know the expected effects and which adverse effects to report; keep an up-to-date list of all medications, including over-the-counter drugs and supplements. For children: never lie about taste, and never tell a child an injection will not hurt — describe it as a pinch or sting. For older adults: request easier-to-open caps, use large print, and remember that reduced adipose tissue may require a shorter needle so a subcutaneous drug is not inadvertently given intramuscularly.

How to word it — jargon, vagueness, and arithmetic

The list above is what to teach. Exam items ask how to say it, and they do it by offering four options that are all true and asking for the best one. An instruction fails in three ways: it is jargon the patient does not know, it is vague so the patient has to invent the standard, or it is correct but requires the patient to calculate something. Arithmetic is a barrier in its own right, independent of reading level.

The Pharmacology Crossword Vocabulary

The only in-course practice artifact posted for Chapter 30 is a Pharmacology Crossword Puzzle. Its twenty-five answers are, in effect, the instructor's own list of the terms that matter. Every one is defined below — if a term shows up on the exam, it is very likely one of these.

Numbers to know cold

Sequences to recite

The traps, in one place

The eleven questions the lecture decks ask themselves

The two posted lecture decks — one on infection control, one on medication administration — each carry review questions inside the slides, with the answer and rationale on the following slide. An instructor who writes a review question into a deck has told you what they think matters. Treat every one of these as a likely exam item, and be able to answer it without hesitating.