Keep sterile items sterile: if in doubt, it is not sterile; replace, never wipe.
Prevent harm in the environment: fall measures, restraints only as a last resort, RACE and PASS for fire.
Check the rights of medication administration, two identifiers and extra safeguards for high-alert drugs; report errors and near misses.
Prioritization & delegation
Method
Ask what will harm the patient soonest if nothing is done.
Apply ABC (C-A-B in cardiac arrest), then Maslow: physiological needs before safety, safety before psychological needs.
Compare the options: acute before chronic, unstable before stable, unexpected before expected, systemic before local, and check each finding against the patient’s baseline.
Assess before you act unless it is an emergency; then choose the step the others depend on.
For delegation, check the five rights: task, circumstance, person, directions and supervision. Assessment, teaching and evaluation stay with the RN.
Lab values & electrolytes
Method
Compare the value with the laboratory’s own reference range, then with the patient’s baseline and trend.
Check the sample: hemolysis, a delay, or blood drawn near an IV can give false results.
Link the value to its typical signs and to the drugs and conditions that cause it.
Look for interactions: low potassium or magnesium increases digoxin toxicity; dehydration raises lithium.
Act on the patient: assess, hold a drug if the level is unsafe, read back critical values and inform the prescriber.
Med-surg: cardiovascular & respiratory
Method
Name the problem: pump failure, blocked artery, rhythm, clot, airway narrowing, infection or a device problem.
Check the danger signs first: hypoxia, hypotension, chest pain, new confusion, a cold pulseless limb.
Match the oxygen to the patient: 94–98% for most, 88–92% for those at risk of CO₂ retention.
Link each drug to its test and its risk: warfarin and INR, heparin and aPTT and platelets, diuretics and potassium.
Choose the safe first action, then escalate and reassess.
Med-surg: neuro, endocrine & renal
Method
Check the glucose in every patient with new confusion, weakness or a seizure.
Use the level of consciousness as the earliest warning of brain trouble; pupils and Cushing’s triad come late.
For diabetes emergencies, separate DKA (ketones, acidosis) from HHS (very high osmolality, dehydration); give fluids first.
For sodium and water, decide whether ADH is in excess (SIADH) or missing (DI), and correct chronic changes slowly.
For kidney problems, sort the cause into pre-renal, intrinsic or post-renal, and watch potassium and fluid.
Med-surg: GI, perioperative & oncology
Method
Ask what could be hidden: internal bleeding, infection without fever, hypoventilation behind a normal SpO₂.
Use the timing after surgery to narrow the complications: bleeding in hours, chest problems in days, wound and leak problems later.
For pain, assess, treat with multimodal analgesia, reassess, and monitor sedation with every opioid.
For cancer patients, treat any illness during the nadir as neutropenic sepsis and know the oncological emergencies.
For burns, count only partial- and full-thickness areas, start the Parkland clock at the time of the burn and titrate to urine output.
Maternity & obstetric nursing
Method
Place the woman in time: weeks of pregnancy, stage of labour or day after birth, and decide what is normal at that point.
Look for the patient in danger: the mother, the fetus or the newborn, or more than one of them.
Link the finding to its cause: VEAL CHOP for decelerations, the four Ts for bleeding, BUBBLE-HE after birth.
Choose the action that improves blood flow and oxygen first (side-lying, stopping oxytocin, fundal massage), then escalate.
Pediatric nursing
Method
Note the child’s age first: it sets the normal vital signs, the milestones and the right pain scale.
Assess airway, breathing and circulation, remembering that children compensate and then deteriorate fast.
Match the action to the development stage and involve the family.
Check that the answer is safe for a child: weight-based, no aspirin in viral illness, no codeine under 12.
Mental health nursing
Method
Decide whether there is an immediate risk: suicide, violence, a drug emergency or a physical illness.
Act on safety first: observe, remove means, de-escalate, stop a harmful drug, get help.
Choose the therapeutic response: acknowledge feelings, present reality, avoid false reassurance and “why” questions.
Respect rights: the least restrictive option, consent and confidentiality with its limits.
Nursing math & unit conversions
Metric steps
1 kg = 1000 g, 1 g = 1000 mg, 1 mg = 1000 mcg, 1 L = 1000 mL
Weight and length
1 kg = 2.2 lb, 1 lb = 16 oz, 1 in = 2.54 cm, 1 ft = 12 in
Household measures
1 tsp = 5 mL, 1 tbsp = 15 mL, 1 fl oz = 30 mL, 1 cup = 8 fl oz = 240 mL
falls 25, diagnosis 15, aid 15/30, IV 20, gait 10/20, mental status 15
NEWS2 risk
0–4 low; single 3 low–medium; 5–6 medium; ≥ 7 high
Mean arterial pressure
MAP = (SBP + 2·DBP)/3 = DBP + PP/3
Pulse pressure and shock index
PP = SBP − DBP, SI = HR/SBP
Body mass index
BMI = kg/m² = 703·lb/in²
Method
Find the score sheet that the question uses and its range (GCS 3–15, APGAR 0–10, Braden 6–23, Morse 0–125).
Score every item separately, matching the description to its level.
Add the item scores and check that the total lies inside the range.
Apply the cut-offs: for NEWS2 also look for any single parameter scoring 3.
For derived values use MAP = (SBP + 2·DBP)/3, PP = SBP − DBP, SI = HR/SBP and BMI = kg/m².
2Practice problems
1.Nursing fundamentalsMedium
Why must a respirator such as an FFP3 or N95 mask be fit-tested?
AFit-testing makes the mask reusable for a week
BFit-testing checks whether the patient is still infectious
CIt only protects if it seals closely to the wearer's face
DIt must be tested to check it is the right colour
2.Nursing fundamentalsHard
During a handover the nurse notices a colleague is sharing patient details loudly in a busy corridor. What should the nurse do?
AJoin in to finish the handover more quickly
BSuggest moving the handover to a private place
CIgnore it, as handover is part of care
DReport the colleague to the police
3.Infection control & patient safetyMedium
A family member will visit a patient on contact precautions. What should the nurse do?
AAsk them to wear an N95 respirator only, with no gown or gloves
BTell them visits are not allowed at all
CTell them precautions only apply to staff
DShow them how to use the gown and gloves and how to clean their hands
4.Infection control & patient safetyHard
A handwritten order reads “10U regular insulin subcut now”. What is the nurse’s best action?
AGive 100 units, as the order seems to say
BGive 10 units without question, as written
CAsk a nursing assistant to interpret the handwriting
DClarify the order, because “U” can be misread
5.Prioritization & delegationMedium
A patient uses patient-controlled analgesia (PCA) after surgery. Which statement by a family member shows a need for further teaching?
A“The pump has limits set by the nurse so she cannot get too much at once.”
B“Only she should press the button when she needs pain relief.”
C“I will tell the nurse if she becomes very sleepy or hard to wake.”
D“I will press the button for her while she is asleep so she stays comfortable.”
6.Prioritization & delegationHard
An RN has five patients and a nursing assistant. One patient has just become short of breath. Which task should the RN delegate so that the RN can go to that patient?
AMorning vital signs on the four stable patients
BGiving the breathless patient’s IV furosemide
CExplaining the new diagnosis to the breathless patient’s family
DAssessing the breathless patient’s lung sounds
7.Clinical nursingMedium
Which blood results are typical of Addison's disease (primary adrenal insufficiency)?
AHigh sodium and low potassium
BHigh glucose and high calcium
CLow haemoglobin and high platelets
DLow sodium and high potassium
8.Clinical nursingHard
A patient with a COPD exacerbation remains acidotic with a high PaCO2 despite optimal medical treatment and controlled oxygen. Which treatment is usually considered next?
A15 L/min oxygen via a non-rebreathe mask
BSedation to slow the breathing
CNon-invasive ventilation
DStopping all oxygen therapy
9.Lab values & electrolytesMedium
A patient on warfarin for atrial fibrillation has a target INR of 2.0–3.0. How does the usual target for a patient with a mechanical mitral valve compare?
AMuch higher, about 5.0–6.0
BHigher, about 2.5–3.5
CThe same, 2.0–3.0
DLower, about 1.0–1.5
10.Lab values & electrolytesHard
A patient with advanced chronic kidney disease has a mildly raised troponin that has stayed the same on several tests over months. There is no chest pain and the ECG is unchanged. What is the best interpretation?
AA laboratory error, because troponin is never raised in kidney disease
BA chronic stable rise; infarction needs a rising or falling pattern
CProof of an acute myocardial infarction that needs emergency treatment now
DA sign of skeletal muscle injury, because troponin comes from all muscles
11.PharmacologyMedium
A patient uses a salbutamol (albuterol) inhaler and a corticosteroid inhaler at the same time of day. Which order is usually taught?
AUse the salbutamol first, wait a few minutes, then use the steroid
BThe order does not matter and no waiting is needed
CUse the steroid first, then the salbutamol right after without any gap
DUse both in the same breath to save time
12.PharmacologyHard
Before starting rituximab, patients are tested for hepatitis B. Why?
ARituximab can reactivate hepatitis B and cause liver failure
BRituximab is made from the hepatitis B virus
CHepatitis B infection makes rituximab completely ineffective
DRituximab is a vaccine against hepatitis B
13.Med-surg: cardiovascular & respiratoryMedium
A patient uses a glyceryl trinitrate (nitroglycerin) patch for angina. Why is it usually removed for several hours each day?
AThe skin needs a break to absorb a larger dose
BA nitrate-free interval prevents tolerance
CIt lowers the risk of a high potassium level
DThe patch works only during the night
14.Med-surg: cardiovascular & respiratoryHard
A 25-year-old non-smoker has wheeze and cough that come and go, worse at night and after exercise. Spirometry improves markedly after a bronchodilator. Which diagnosis is most likely?
AAsthma
BHeart failure
CIdiopathic pulmonary fibrosis
DCOPD
15.Med-surg: neuro, endocrine & renalMedium
A patient with a right-hemisphere stroke ignores food on the left side of the plate. What is this called?
ADysphagia
BLeft-sided neglect
CExpressive aphasia
DCerebellar ataxia
16.Med-surg: neuro, endocrine & renalHard
Three days after a stroke, a patient with dysphagia on a modified diet has a temperature of 38.2 °C (100.8 °F), a respiratory rate of 24/min and crackles at the right lung base. What should the nurse do?
AEncourage more fluids by mouth to treat the fever
BGive paracetamol (acetaminophen) and continue the modified diet as before
CRecord the findings and recheck them at the next routine observation
DSuspect aspiration pneumonia, stop oral intake and escalate for review
17.Med-surg: GI, perioperative & oncologyMedium
In the SBAR communication tool, what belongs under "A"?
AThe patient's admission date only
BA list of the patient's allergies only
CThe nurse's assessment of what the problem is
DThe address and phone number of the patient's next of kin
18.Med-surg: GI, perioperative & oncologyHard
A patient with known oesophageal varices is vomiting large amounts of fresh blood. Which treatments should the nurse anticipate before endoscopy?
AOral NSAID for pain and a high-protein meal
BAn urgent barium swallow before any drug treatment
COctreotide or terlipressin, plus IV antibiotics, during resuscitation
DRapid saline infusion to a high blood pressure
19.Maternity & obstetric nursingMedium
Why are pregnant women at increased risk of urinary tract infection and pyelonephritis?
AProgesterone dilates the ureters and slows the flow of urine
BPregnancy greatly reduces the production of urine
CThe bladder empties more completely in pregnancy
DThe urine becomes more acidic in pregnancy
20.Maternity & obstetric nursingHard
A preterm baby's parents are being taught about breast milk. Which statement shows they understand its special benefit for preterm babies?
A"Breast milk means our baby will not need any oxygen."
B"Breast milk removes the need for eye screening."
C"Breast milk stops jaundice from ever developing."
D"Breast milk lowers the risk of necrotising enterocolitis."
21.Pediatric nursingMedium
Using the 100–50–20 rule, what is the daily maintenance fluid requirement for a 15 kg child?
A1000 mL per day
B1250 mL per day
C750 mL per day
D1500 mL per day
22.Pediatric nursingHard
A teenager with severe anorexia nervosa starts nutritional rehabilitation. Which blood result is most important to watch in the first days?
ACholesterol
BBilirubin
CPhosphate
DAmylase
23.Mental health nursingMedium
Which behaviour is a warning sign of possible suicidal intent in a depressed patient?
AAsking for help with a job application for after discharge
BMaking plans for a family holiday
CGiving away valued possessions and suddenly seeming calm
DTalking about their favourite music
24.Mental health nursingHard
A patient tells the nurse, "You're the only one I can talk to. You're much better than the other nurses." What is the most appropriate response?
A"The other nurses are not as experienced as I am, so it makes sense that you prefer talking to me."
B"You shouldn't compare nurses. That's not fair to them, and it's rude."
C"Thank you. I'll make sure I'm always the one assigned to you from now on."
D"I'm glad our talks help. All the staff here are working with you, and it's important that you can talk to them too."
25.Nursing math & unit conversionsMedium
Practice exercise (made-up values, not clinical guidance). A dose is charted at 5:05 AM. Which entry is the same time on the 24-hour clock? Click it.
5:05 AM
117:05
206:05
305:05
404:05
26.Nursing math & unit conversionsHard
Practice exercise (made-up values, not clinical guidance). An order reads 5 mcg/kg/min for a patient who weighs 75 kg. Express the dose rate D in mg/h. Round to two decimal places.
5 mcg/kg/min75 kg
D = mg/h
27.Dosage calculationsMedium
A child weighing 32 kg is prescribed 7.5 mg/kg of a drug. The stock solution contains 50 mg/mL. Draw up the dose: what volume V do you give?
32 kg7.5 mg/kg50 mg/mL
V = mL
28.Dosage calculationsHard
You must prepare 1000 mL of a 2% (w/v) solution from a 10% (w/v) stock solution. What volume of stock V₁ do you need?
C₁ = 10%C₂ = 2%V₂ = 1000 mL
V₁ = mL
29.IV infusion ratesMedium
A drip runs at 100 gtt/min through a set of 60 gtt/mL. How many millilitres V does the patient receive in 8 hours?
100 gtt/min60 gtt/mL8 h
V = mL
30.IV infusion ratesHard
500 mg of a drug is diluted in 500 mL and given by gravity through a set of 60 gtt/mL. The order is 20 mg per hour. Find the drip rate R in drops per minute.
500 mg/500 mL20 mg/h60 gtt/mL
R = gtt/min
31.IV fluids & fluid balanceMedium
Practice exercise (made-up values, not clinical guidance). The record shows a patient's intake and output for one 12-hour shift. The patient weighs 89 kg. Find the average urine output U in mL/kg/h. Round to two decimal places.
Practice exercise (made-up values, not clinical guidance). A 1000 mL infusion starts at 13:30 at 125 mL/h. After 4 hours the rate is changed to 150 mL/h and is not changed again. How many hours t after the start will the bag be empty? Round to one decimal place.
1000 mL125 mL/h · 4 h150 mL/h
t = h
33.Clinical assessment scoresMedium
Practice exercise (made-up values, not clinical guidance). A practice chart records GCS 15, with E4 and V5. What motor score M was recorded, and which response does it describe? Give the number.
GCS 15E4V5
M =
34.Clinical assessment scoresHard
Practice exercise (made-up values, not clinical guidance). An adult weighs 121 kg and is 150 cm tall. Calculate the BMI and click the WHO weight category.
121 kg150 cm
1underweight
2healthy weight
3overweight
4obesity class I
5obesity class II
6obesity class III
3Solutions
1.Nursing fundamentals
Answer: C · It only protects if it seals closely to the wearer's face
Why this is the answer
A respirator filters tiny airborne particles only if air passes through the filter, not around a gap. Fit-testing and a fit-check every time it is worn make sure it seals.
Answer
C · It only protects if it seals closely to the wearer's face
2.Nursing fundamentals
Answer: B · Suggest moving the handover to a private place
Why this is the answer
Information shared for care must still be protected from people who do not need it. Moving to a private area or speaking quietly at the bedside protects patient confidentiality.
Answer
B · Suggest moving the handover to a private place
3.Infection control & patient safety
Answer: D · Show them how to use the gown and gloves and how to clean their hands
Why this is the answer
Visitors are taught how to put on and remove PPE as required by the policy and how to perform hand hygiene, so they protect themselves and other patients.
Answer
D · Show them how to use the gown and gloves and how to clean their hands
4.Infection control & patient safety
Answer: D · Clarify the order, because “U” can be misread
Why this is the answer
“10U” can be read as 100 or 104 units, a potentially fatal overdose. The nurse clarifies the order and asks for “units” to be written in full. Guessing is never acceptable for insulin.
Answer
D · Clarify the order, because “U” can be misread
5.Prioritization & delegation
Answer: D · “I will press the button for her while she is asleep so she stays comfortable.”
Why this is the answer
PCA is safe because a sleepy patient cannot press the button. If someone else presses it, the patient can receive too much opioid and develop respiratory depression.
Answer
D · “I will press the button for her while she is asleep so she stays comfortable.”
6.Prioritization & delegation
Answer: A · Morning vital signs on the four stable patients
Why this is the answer
Routine vital signs on stable patients can be delegated, freeing the RN to assess and treat the unstable patient. Assessment, IV medication and explaining a new diagnosis stay with the RN.
Answer
A · Morning vital signs on the four stable patients
7.Clinical nursing
Answer: D · Low sodium and high potassium
Why this is the answer
Without aldosterone, the kidneys lose sodium and retain potassium. Patients may also have low blood pressure, low glucose and increased skin pigmentation.
Answer
D · Low sodium and high potassium
8.Clinical nursing
Answer: C · Non-invasive ventilation
Why this is the answer
In hypercapnic respiratory failure from COPD that persists despite treatment, non-invasive ventilation (bilevel positive pressure) supports ventilation and lowers PaCO2. Stopping oxygen would cause dangerous hypoxia.
Answer
C · Non-invasive ventilation
9.Lab values & electrolytes
Answer: B · Higher, about 2.5–3.5
Why this is the answer
Mechanical heart valves, especially in the mitral position, have a high risk of thrombosis, so the INR target is usually higher, about 2.5–3.5. An INR of 5 or more carries a high bleeding risk.
Answer
B · Higher, about 2.5–3.5
10.Lab values & electrolytes
Answer: B · A chronic stable rise; infarction needs a rising or falling pattern
Why this is the answer
Troponin is often chronically raised in CKD and other conditions. Acute infarction is diagnosed by a rise and/or fall in troponin together with symptoms or ECG changes, so serial results are compared with the patient's baseline.
Answer
B · A chronic stable rise; infarction needs a rising or falling pattern
11.Pharmacology
Answer: A · Use the salbutamol first, wait a few minutes, then use the steroid
Why this is the answer
The bronchodilator opens the airways so that the inhaled steroid can reach further into the lungs. A short wait between the inhalers is usually advised.
Answer
A · Use the salbutamol first, wait a few minutes, then use the steroid
12.Pharmacology
Answer: A · Rituximab can reactivate hepatitis B and cause liver failure
Why this is the answer
Rituximab destroys CD20-positive B cells, weakening control of latent hepatitis B. Reactivation can cause fulminant hepatitis, so carriers receive monitoring or antiviral prophylaxis.
Answer
A · Rituximab can reactivate hepatitis B and cause liver failure
13.Med-surg: cardiovascular & respiratory
Answer: B · A nitrate-free interval prevents tolerance
Why this is the answer
Continuous nitrate use leads to tolerance within days. A daily nitrate-free period (often overnight, when angina is least likely) keeps the drug effective. Patients are taught to rotate patch sites.
Answer
B · A nitrate-free interval prevents tolerance
14.Med-surg: cardiovascular & respiratory
Answer: A · Asthma
Why this is the answer
Asthma typically causes variable symptoms with reversible airflow obstruction. COPD usually affects older people with a smoking history and causes persistent, poorly reversible obstruction. Fibrosis gives a restrictive pattern.
Answer
A · Asthma
15.Med-surg: neuro, endocrine & renal
Answer: B · Left-sided neglect
Why this is the answer
Right-hemisphere strokes commonly cause neglect of the left side of space and the body. The nurse may need to prompt the patient to scan to the left, and the environment should be arranged safely. Aphasia is typical of left-hemisphere damage.
Answer
B · Left-sided neglect
16.Med-surg: neuro, endocrine & renal
Answer: D · Suspect aspiration pneumonia, stop oral intake and escalate for review
Why this is the answer
These signs suggest aspiration pneumonia, which is a common and serious complication of dysphagia. The patient needs medical review, chest assessment, oxygen if needed, and reassessment of their swallow before eating again.
Answer
D · Suspect aspiration pneumonia, stop oral intake and escalate for review
17.Med-surg: GI, perioperative & oncology
Answer: C · The nurse's assessment of what the problem is
Why this is the answer
SBAR is Situation, Background, Assessment and Recommendation. Under Assessment, the nurse gives the findings and their interpretation, for example "I think the patient may be bleeding".
Answer
C · The nurse's assessment of what the problem is
18.Med-surg: GI, perioperative & oncology
Answer: C · Octreotide or terlipressin, plus IV antibiotics, during resuscitation
Why this is the answer
In suspected variceal bleeding, a vasoactive drug (octreotide in the US, or terlipressin where it is licensed) reduces portal pressure, and prophylactic antibiotics such as ceftriaxone reduce infection and mortality in cirrhosis. Resuscitation is cautious to avoid raising portal pressure. Endoscopic band ligation is the definitive treatment.
Answer
C · Octreotide or terlipressin, plus IV antibiotics, during resuscitation
19.Maternity & obstetric nursing
Answer: A · Progesterone dilates the ureters and slows the flow of urine
Why this is the answer
Progesterone relaxes and dilates the ureters, and the growing uterus compresses them, so urine stasis occurs. This makes ascending infection easier, which is why asymptomatic bacteriuria is screened for and treated.
Answer
A · Progesterone dilates the ureters and slows the flow of urine
20.Maternity & obstetric nursing
Answer: D · "Breast milk lowers the risk of necrotising enterocolitis."
Why this is the answer
Human milk, including expressed or donor milk, reduces the risk of necrotising enterocolitis and infection in preterm babies. It does not remove the need for other monitoring.
Answer
D · "Breast milk lowers the risk of necrotising enterocolitis."
21.Pediatric nursing
Answer: B · 1250 mL per day
Why this is the answer
First 10 kg: 10 × 100 = 1000 mL. Next 5 kg: 5 × 50 = 250 mL. Total = 1250 mL per day, or about 52 mL per hour.
Answer
B · 1250 mL per day
22.Pediatric nursing
Answer: C · Phosphate
Why this is the answer
When feeding restarts after starvation, insulin drives phosphate, potassium and magnesium into cells. Low phosphate can cause heart failure, arrhythmias and confusion, so electrolytes are checked often and feeds are increased gradually.
Answer
C · Phosphate
23.Mental health nursing
Answer: C · Giving away valued possessions and suddenly seeming calm
Why this is the answer
Warning signs include talk of death, giving away possessions, saying goodbye, a sudden improvement in mood after deep depression, and searching for means.
Answer
C · Giving away valued possessions and suddenly seeming calm
24.Mental health nursing
Answer: D · "I'm glad our talks help. All the staff here are working with you, and it's important that you can talk to them too."
Why this is the answer
Accepting the role of the "only" helper encourages dependence and splitting. The nurse acknowledges the patient's feeling and encourages trust in the whole team, which keeps care consistent.
Answer
D · "I'm glad our talks help. All the staff here are working with you, and it's important that you can talk to them too."
25.Nursing math & unit conversions
Answer: 05:05
24-hour clock: from 1 PM onwards add 12 to the hour (3:45 PM = 15:45). Midnight to 12:59 AM is 00:00–00:59, and 12:00–12:59 PM stays 12:00–12:59. Going back, subtract 12 from hours 13–23 and add PM; hours 00 become 12 AM. Count time across midnight in two parts: up to 24:00 (00:00), then from 00:00 on.
Convert the hour
5 AM → 05
Answer
05:05
Answer
05:05
26.Nursing math & unit conversions
Answer: D = 22.5 mg/h
Dimensional analysis: write the given quantity, then multiply by conversion factors written as fractions (for example 60 min/1 h or 1 mg/1000 mcg) so that each unwanted unit appears once on top and once underneath and cancels. When only the wanted unit is left, calculate. Use the equivalents the question gives and round only the final answer.
Set up the chain
D = 5 mcg/kg/min × 75 kg × (60 min/1 h) × (1 mg/1000 mcg)
Calculate
D = 5·75·60/1000 = 22.5 mg/h
Answer
D = 22.5 mg/h
27.Dosage calculations
Answer: V = 4.8 mL
Drawing up a dose: volume = (prescribed dose/stock strength) × stock volume. Convert to the same units first, then check that the volume fits the syringe and lands on one of its graduations.
Dose from body weight
D = 7.5·32 = 240 mg
Volume
V = 240/50 = 4.8 mL
On the syringe
On this 10 mL syringe every small line is 0.2 mL.
Answer
V = 4.8 mL
28.Dosage calculations
Answer: V₁ = 200 mL
Solution strengths: a percentage strength is grams per 100 mL, so 1% = 1 g/100 mL = 10 mg/mL. A ratio strength 1:1000 means 1 g in 1000 mL = 1 mg/mL; 1:10 000 is 0.1 mg/mL. For a dilution the amount of drug stays the same: C₁·V₁ = C₂·V₂.
Volume of stock
V₁ = 2·1000/10 = 200 mL
Answer
V₁ = 200 mL
29.IV infusion rates
Answer: V = 800 mL
Infusion rates: a pump is set in mL/h = volume/time in hours. A gravity drip is counted in drops per minute: gtt/min = volume (mL) × drop factor (gtt/mL)/time (min). The drop factor is printed on the tubing package: macrodrip sets deliver 10, 15 or 20 gtt/mL (blood sets often 10 gtt/mL in the US, 15 in the UK) and microdrip sets 60 gtt/mL. Always use the drop factor the question or package gives.
Rate in mL/h
100·60/60 = 100 mL/h
Volume
V = 100·8 = 800 mL
Answer
V = 800 mL
30.IV infusion rates
Answer: R = 20 gtt/min
Dose-based infusions: concentration = amount of drug in the bag/bag volume. Pump rate (mL/h) = dose per hour/concentration, and dose per hour = mL/h × concentration. Convert per-minute doses to per-hour (× 60) and keep the mass units the same (1 g = 1000 mg, 1 mg = 1000 mcg).
Concentration
500/500 = 1 mg/mL
Volume per hour
20/1 = 20 mL/h
Drip rate
R = 20·60/60 = 20 gtt/min
Answer
R = 20 gtt/min
31.IV fluids & fluid balance
Answer: U = 0.51 mL/kg/h
Intake and output: intake counts everything that goes in (oral fluids, IV infusions, IV medications and flushes, tube feeds); ice chips count as half their volume. Output counts urine, drains, vomit and other losses. Balance = total intake − total output; a negative balance is a net loss. The numbers are for practice only; at the bedside always follow local protocols and have high-risk doses double-checked.
Total urine
375 + 175 = 550 mL
Per kilogram per hour
U = 550/(89·12) = 0.515 ≈ 0.51 mL/kg/h
Answer
U = 0.51 mL/kg/h
32.IV fluids & fluid balance
Answer: t = 7.3 h
Infusion time: time (h) = volume to infuse (mL)/rate (mL/h); use the volume still left in the bag, not the bag size. Volume infused = rate × time. Convert decimal hours to hours and minutes with the fraction × 60 (0.5 h = 30 min, not 50 min). The numbers are for practice only; at the bedside always follow local protocols and have high-risk doses double-checked.
First part
125·4 = 500 mL
1000 − 500 = 500 mL left
Second part
500/150 = 3.333 h
Total time
t = 4 + 3.333 = 7.333 ≈ 7.3 h
Answer
t = 7.3 h
That is about 7 h 20 min, so the bag runs out at about 20:50.
33.Clinical assessment scores
Answer: M = 6
Glasgow Coma Scale: add the best response in three areas. Eye opening E: 4 spontaneous, 3 to sound or speech, 2 to pressure, 1 none. Verbal V: 5 oriented, 4 confused, 3 inappropriate words, 2 incomprehensible sounds, 1 none. Motor M: 6 obeys commands, 5 localises, 4 normal flexion (withdraws), 3 abnormal flexion, 2 extension, 1 none. The total runs from 3 to 15. After a head injury, 13–15 is usually called mild, 9–12 moderate and 3–8 severe.
Motor score
M = 15 − 4 − 5 = 6
M6: obeys commands
Answer
M = 6
34.Clinical assessment scores
Answer: obesity class III
Body mass index: BMI = weight (kg)/height (m)², with the height converted to metres first. With pounds and inches, BMI = 703 × weight (lb)/height (in)². WHO adult categories: below 18.5 underweight, 18.5–24.9 healthy weight, 25.0–29.9 overweight, 30.0–34.9 obesity class I, 35.0–39.9 obesity class II and 40 or more obesity class III.