System by system, and the patient who has several at once
Medical-Surgical Nursing I taught the method — assess, recognise deterioration, manage fluids, handover, discharge. This is the half that applies it to actual bodies, one system at a time, and then to the patient who arrives with four systems failing together, which is who is actually in the bed.
Examinations are organised by system, textbooks are organised by system, and wards are not. The patient in bed four has heart failure, diabetes, kidney disease and an infection, and each one is changing what the others do. Learning system by system is the right way in, because you cannot reason about four things interacting until you can reason about one. But it is a scaffold, and the last chapters of this manual are about taking it down again.
For every system: what does this organ do, what does it look like when it stops doing it, what does the nurse assess, and what does the nurse do. That shape repeats in every chapter deliberately. A student who learns the shape can reason about a condition they have never met, which is what an examination scenario is designed to test and what a ward will actually demand.
In almost none of what follows does a nurse choose the treatment. In almost all of it, a nurse decides how fast the system responds. Noticing that the confused patient is hypoxic rather than difficult, that the quiet patient is bleeding, that the breathless patient has become breathless in the last twenty minutes — that is the work, and it is what the examinations are actually testing when they give you a scenario.
The World Health Organization attributes the large majority of deaths worldwide to noncommunicable disease, dominated by cardiovascular disease, cancers, chronic respiratory disease and diabetes. Those four fill medical wards on every continent, increasingly including countries still carrying a heavy burden of infectious disease at the same time. A nurse trained only in one of those two pictures is trained for half a ward.
Level of consciousness, described with a scale rather than a word, because drowsy means different things to different nurses while a recorded score does not. Pupils. Limb power, compared side to side. Speech. Swallow. Orientation. Any change in any of these, in a patient in whom it was previously different, is the finding — not the absolute value.
Facial weakness, arm weakness and disturbed speech are the recognised warning signs, and any one of them warrants immediate escalation. The reason the urgency is absolute is that treatment options close with time, and function that is lost is often not recovered. A nurse does not diagnose a stroke; a nurse decides whether the system moves in ten minutes or two hours, and that decision changes how much of somebody's life they get back.
The skull does not expand, so anything that swells or bleeds inside it raises pressure on the brain. The signs are a falling level of consciousness, worsening headache, vomiting, changes in pupils, and later changes in pulse, blood pressure and breathing. A patient whose consciousness is dropping is an emergency regardless of what anybody expects the cause to be, and positioning, calm and immediate escalation are the nursing actions.
Protect from injury, cushion the head, remove hazards, time it, nothing in the mouth, no restraint, recovery position once movements stop. Duration is what decides whether this is an emergency, and it is the detail most often missing from the account given to the arriving team. Afterwards, the patient is usually confused and frightened and has no memory of it; explaining what happened, more than once, is part of the care.
Swallowing, continence, communication, mobility, skin and mood are all affected, and all of them are nursing. A patient who cannot speak is not a patient who cannot understand, and talking over them is both a cruelty and a clinical error. Early, deliberate positioning prevents contractures that months of therapy may not undo.
A heart that cannot move blood forward causes it to back up. Backing up behind the left side fills the lungs: breathlessness, worse lying flat, waking at night gasping, a cough. Backing up behind the right side fills the body: swollen ankles and legs, a distended abdomen, a raised neck vein, weight gain over days. A nurse who understands forward and backward can predict the signs rather than memorise two lists.
In a patient with heart failure, weight measured the same way at the same time each day detects fluid accumulating days before it becomes visible as swelling or breathlessness. It is cheap, it needs no equipment beyond scales, and it is skipped constantly because it feels administrative. A steady rise over three days is a finding to escalate.
Chest pain that is severe, persistent, or accompanied by sweating, breathlessness, nausea or collapse is an emergency until proven otherwise. Presentation differs: women, older people and people with diabetes more often present without classical crushing central pain, and that is a documented reason their treatment is delayed. A nurse who waits for the textbook picture will be late for exactly the patients who are already at highest risk.
What matters is whether tissue is getting blood, and blood pressure is a late and blunt indicator of that. Pulse rate and character, capillary refill, peripheral temperature, urine output and conscious level all move earlier. In a young, previously fit patient compensation holds the blood pressure normal until it fails suddenly, which is why waiting for hypotension means escalating late in the patients who deteriorate fastest.
Respiratory rate, counted properly over a full minute, is the single most sensitive early indicator of deterioration in adults and the observation most often estimated or copied from the last set. Work of breathing — accessory muscles, indrawing, sitting forward, an inability to finish a sentence — tells you how hard that rate is being bought. A saturation held through enormous effort is not reassurance.
A breathless patient who becomes calm and drowsy while still unwell is usually tiring, not improving. Reduced work of breathing in somebody who has not been treated is one of the most dangerous misreadings available to a nurse, and it precedes respiratory arrest. Escalate on it immediately.
These patients live with breathlessness and know their own condition better than any nurse meeting them for the first time. The nursing work is positioning, pacing, a fan or moving air, secretion clearance, managing anxiety which genuinely worsens breathlessness, and oxygen given to a target rather than turned up to comfort — in a subset of these patients sustained high concentrations carry their own risk, which is why targets are set and reviewed.
Pneumonia is a leading cause of admission and death, and in hospital it frequently follows aspiration in patients whose swallow was never assessed. Sitting patients upright to eat, keeping them upright afterwards, mouth care in anyone not eating normally, and referring an unsafe swallow are all nursing actions that prevent it. A wet, gurgling voice after swallowing is a finding, not a quirk.
How much a patient passes, how concentrated it is, and how that has changed tell you about circulation, hydration and kidney function at once — for free, at the bedside, without a laboratory. A falling output is one of the earliest signs that perfusion is inadequate anywhere in the body, which is why it is measured in every seriously unwell patient and why an inaccurate fluid chart is worse than none.
Fluid accumulates, waste accumulates, electrolytes move out of range, and the patient becomes swollen, breathless, nauseated, itchy, confused and eventually drowsy. Dangerous potassium levels arise without any outward sign until the heart is affected, which is why the laboratory result matters and why a nurse chases it rather than filing it. Fluid balance, weight, and accurate recording are the nursing contribution.
Dehydration, low blood pressure, infection and certain medicines are the common insults, and they frequently arrive together in an unwell older patient. A nurse who keeps a patient hydrated, notices a falling urine output, escalates a low blood pressure and flags medicines that may need reviewing has prevented a great deal of kidney injury without treating anything.
A patient who has not passed urine and is uncomfortable, restless or newly confused may be in retention rather than anuric, and the distinction changes everything. Catheters are inserted for an indication, kept as a closed system, reviewed daily, and removed as early as possible — the most effective prevention of catheter-associated infection remains not having one.
Hypoglycaemia presents as confusion, aggression, sweating, tremor, slurred speech or reduced consciousness, and it is frequently mistaken for intoxication, a behavioural problem or a stroke. It is rapidly reversible and rapidly harmful, which makes it one of the few conditions where the nurse's speed of recognition changes the outcome within minutes. A conscious person able to swallow safely is given fast-acting carbohydrate; an unconscious one is given nothing by mouth and managed as an emergency.
Sustained high sugar causes thirst, large urine volumes, dehydration, blurred vision and tiredness. Two acute emergencies arise from it, one characteristically in younger people with rapid onset and a pattern of deep sighing breathing and a fruity breath smell, the other characteristically in older people with profound dehydration developing over days. Both are protocol-managed; the nurse recognises, escalates and monitors.
The World Health Organization identifies diabetes as a major global burden, with complications affecting kidneys, eyes, nerves and blood vessels. The nursing consequence is concrete and daily: feet are inspected in every diabetic inpatient, because a person who cannot feel a stone in their shoe can lose a foot to an injury they never felt. Education about feet is one of the highest-value conversations a nurse has.
An over- or under-active thyroid changes heart rate, temperature, weight, bowels and mood, and is frequently missed because each symptom is attributed elsewhere. A patient on long-term steroid treatment who becomes acutely unwell or misses doses can deteriorate dangerously and needs urgent escalation. A student should know both patterns exist and both are easy to attribute to something else.
Vomited blood or material like coffee grounds, or black tarry stool, means bleeding into the upper gut and is an emergency. The patient may look well for a surprisingly long time and then collapse, because blood lost internally does not announce itself. Pulse, perfusion, conscious level and the patient's own sense that something is wrong all move before blood pressure does.
Pain out of proportion to the examination, a rigid board-like abdomen, absent bowel sounds with distension, vomiting that will not stop, or an abdomen that has changed over hours. Any of these needs escalating rather than watching. A patient who has not passed flatus or stool after surgery, with a distending abdomen, is a specific and common pattern to recognise.
Jaundice, itching, swelling of the abdomen and legs, easy bruising and bleeding, and confusion that progresses to drowsiness and coma. The confusion is the sign nurses most often meet first and most often attribute to something else. Skin care matters more than usual because these patients itch, bruise and break down easily, and a fall carries a greater bleeding risk.
A new stoma is a change to somebody's body and to how they see themselves, and the nursing is practical and emotional at once — protecting skin, teaching the appliance, and letting them go home able to manage it. Patients who leave hospital unable to manage their own stoma come back. Teaching it properly, and checking they can do it rather than that they said yes, is the whole of a safe discharge.
The injury is visible and the complications are not: bleeding, damage to nerves and vessels, fat entering the circulation, and swelling inside a compartment that cuts off its own blood supply. Pain out of proportion to the injury, pain on passive stretch, numbness, a limb that is pale, cold or pulseless — these are urgent findings under any cast, splint or bandage, and the correct response is to release the covering and escalate.
A patient who does not move loses muscle within days, develops pressure damage, becomes constipated, develops clots, loses bone, becomes breathless on minimal effort and frequently becomes confused and low in mood. Every one of those is nursing territory. Getting a patient up, or moving them properly if they cannot get up, is not physiotherapy's job alone and it is not optional.
Calf pain, swelling, warmth or redness in a leg, and sudden breathlessness or chest pain, are the presentations that matter, and they are more likely in anyone immobile, recently operated on, pregnant or recently delivered, or with cancer. Mechanical and prescribed prevention are used according to protocol; the nursing contribution is mobilising, hydrating, applying prevention correctly, and never dismissing a swollen calf.
Chronic joint disease is one of the largest causes of disability worldwide and is managed rather than cured. Nursing is about function: pain relief timed so it works when the person needs to move, joint protection, aids that actually fit, and realistic goals. A patient whose pain relief is given after they have failed to get out of bed has been given it at the wrong time.
Colour, temperature, moisture, turgor, bruising, rashes and breaks are all systemic information available by looking. Jaundice, cyanosis, pallor, the mottling of poor perfusion, and the bruising of clotting failure are read from the skin before any laboratory returns anything — provided the nurse is looking at skin rather than only at a chart, and provided they know how each of these presents on dark as well as light skin.
Cool with running water for a sustained period, then cover with a clean non-adherent covering. Ice, butter, toothpaste and other traditional applications cause further injury and remain widely used, which makes teaching against them a public health act. Burns swell, so anything constricting is removed early. An inhalation injury is suspected in any burn involving the face, in an enclosed space, or with soot around the nose and mouth, and it is an airway emergency.
Increasing pain, spreading redness, heat, swelling, fluid becoming thicker or discoloured, an offensive smell, a wound that had been improving and has stopped, and a patient who feels unwell. Any of these is escalated rather than dressed over. A wound is assessed, not just covered, and what is seen is recorded in words the next nurse can compare against.
Of all the skin problems on a medical-surgical ward, the one most likely to be caused by the ward itself is pressure damage. Redness that does not blanch is already damage, and on dark skin it may never be visible — so the assessment is by feel for warmth, firmness, bogginess or pain as much as by sight. Nothing in this chapter is more preventable and few things are more often prevented badly.
A patient who is anaemic tires, becomes breathless, heals slowly, tolerates bleeding badly and is at greater risk from every other condition they have. It is extremely common, particularly in women, in older people, in chronic kidney disease and where nutrition is poor, and it is frequently accepted as a background fact rather than treated as the amplifier it is.
Easy bruising, bleeding gums, blood in urine or stool, prolonged bleeding from small wounds, or a patient on treatment that affects clotting who has fallen. Patients whose blood does not clot normally need protecting from injury actively — falls prevention, careful moving, soft toothbrushes, pressure held longer after any needle — and a fall in this group is escalated rather than observed.
A patient whose white cells are low from disease or treatment can become overwhelmingly infected with almost no signs, and a fever in that patient is an emergency requiring immediate escalation rather than paracetamol and a recheck. Protective measures, meticulous hand hygiene and avoiding unnecessary invasive devices are the nursing contribution. Students should know this pattern because it is the one where waiting is most clearly fatal.
Most people with cancer are cared for on ordinary wards by ordinary nurses. The work is symptom control, nutrition, skin, mouth care, fatigue, and the conversations — about what is happening, what is hoped for, and what the person wants. Being able to sit with somebody's fear without rushing to reassure them is the skill, and it is learnable.
Any infection anywhere can become sepsis, and the pattern is the same regardless of the source: the patient is not just unwell but deteriorating, with rapid breathing, a rapid pulse, abnormal temperature in either direction, reduced urine output, mottled or cold skin, confusion, or an overwhelming sense of being very unwell. Rapid breathing is usually the earliest measurable change and the one least often actually counted.
Treatment is protocol-driven and time-dependent, so the nursing contribution is recognition, immediate escalation, obtaining cultures where that is the plan, giving prescribed treatment without delay, and repeating observations often enough to see the trend. One set of observations tells you almost nothing; a trend over an hour tells you a great deal.
Age, diabetes, malnutrition, kidney or liver disease, steroids, cancer treatment and HIV all reduce the ability to fight infection, and they frequently blunt the signs as well. A patient in this group with a normal temperature is not a patient without infection. This is where a nurse's sense that somebody is simply not right earns its place as a clinical finding.
People living with HIV are cared for on general wards for everything else, and they are entitled to the same care and the same confidentiality as anybody. Stigma from health workers is documented, it drives people away from treatment, and it kills. A nurse's job here includes noticing their own reaction and not letting the patient see it, which is a competency rather than a personality.
Sudden loss of vision, sudden severe eye pain, a red painful eye with reduced sight, or new flashes and floaters are urgent. Chronic loss matters differently: a patient who cannot see is at far higher risk of falling, of medicine errors, of missing food, and of being treated as confused when they are simply unable to see. Glasses in a drawer are a patient safety issue.
A patient who cannot hear is routinely mistaken for a patient who cannot understand, and is then spoken about rather than to. Hearing aids that are in a locker, without batteries, or turned off account for a great deal of apparent confusion in older inpatients. Checking them is a two-minute intervention with an outsized effect on everything else.
After a stroke, with a tube in place, with breathlessness, or across a language barrier, a patient may be unable to make themselves understood while understanding perfectly. The nursing response is time, patience, closed questions where they help, writing, pictures, and never finishing somebody's sentence for them. Frustration in these patients is usually about not being heard rather than about their condition.
New confusion, developing over hours or days, fluctuating, with clouded attention, is delirium — and it is caused by infection, hypoxia, pain, retention, constipation, medicines, dehydration or withdrawal. It is common, it is missed, and it carries a high mortality. Treating it as the patient being difficult, or assuming dementia in an older person, is one of the most consequential errors on a medical ward.
The scaffold of one system at a time comes down here. A real patient has heart failure and kidney disease, so the fluid that helps one harms the other. They have diabetes and an infection, so the sugar rises and the infection worsens. They are immobile from a fracture and on treatment that affects clotting. Every decision is a trade, and the nurse is usually the person holding all of it in view at once.
Heart and kidney, where fluid is the shared battleground. Diabetes and infection, which worsen each other. Immobility and almost everything. Pain relief and confusion in older people. Liver or kidney disease and how the body handles medicines. Knowing these five pairings gets a student a long way into most real scenarios.
Airway, breathing, circulation, disability, exposure — the same ranking by how fast a problem kills — applies to a whole shift as well as to one emergency. Which patient, which problem, which hour. A nurse who works through a bay in bed order, hoping, is making allocation decisions by default. Making them explicitly and clinically, and saying out loud what is being left undone, is better nursing and better documentation.
A patient with four conditions is one person with a life, and frequently they know more about living with all of it than any single clinician on the ward. Asking what matters most to them changes plans in ways nothing else does, and it is the question most likely to be skipped on the grounds that there is no time. It takes less time than the readmission does.
The nursing work before an operation is mostly about finding out and telling. What the patient understands about what is being done, what they are allergic to, what they take, whether they have been fasted correctly and for how long, whether they have loose teeth or a difficult airway history, whether they have a device or an implant, who is taking them home. Every one of these prevents a specific and well-documented harm, and every one is frequently skipped when a list is running late. Fasting in particular is done badly almost everywhere: patients are starved for many hours for a case that is then cancelled, arriving dehydrated and hypoglycaemic for an operation that was supposed to help them.
The first hours after anaesthesia are when airway, breathing and circulation are most at risk, and when the patient can tell you least about themselves. Airway position, level of consciousness, respiratory rate and effort, oxygen, pulse and perfusion, the wound and any drains, pain, nausea, temperature, and urine output. Bleeding shows first in pulse, perfusion, conscious level and the wound or drain — blood pressure falls late. A patient who is restless after surgery is assumed to be hypoxic, in pain or bleeding until those three have been excluded, never assumed to be difficult.
Bleeding early. Airway and breathing problems early. Retention of urine in the first day. Chest infection and collapse of lung bases over the first days, prevented by sitting up, deep breathing and getting the patient moving. Wound infection later in the first week. Clots over the first weeks. Knowing roughly when each one appears turns a post-operative round from a set of tasks into a set of questions, and it is why the same observations are repeated at intervals that look excessive until you have seen one of these arrive.
Early mobilisation prevents chest infection, clots, pressure damage, constipation and deconditioning all at once, and it is the single most useful thing done on a surgical ward. It requires pain relief timed so that it is working when the patient is asked to move, rather than given afterwards as consolation. A patient who tried to get up, found it unbearable and refused the next attempt has usually been failed by the timing rather than by their own determination.
The liver and the kidneys are how most medicines leave the body, so a patient with failing liver or kidneys accumulates what a healthy patient clears. Older patients clear more slowly, carry less water and more fat, and take more medicines at once. This is why a dose that was right last year may not be right now, and why a nurse who notices that a patient has become drowsy, confused or unsteady since a medicine was started has made a clinically important observation rather than a complaint.
Effect, and side effect. Did the pain relief work, did the breathing ease, did the sugar come down, did the temperature settle. And then: drowsiness, confusion, unsteadiness, a rash, breathlessness, swelling of the face or mouth, bleeding, a change in pulse or blood pressure, nausea. Almost none of this appears in a record unless somebody chooses to write it, and it is the information that lets a prescription be changed before it does harm.
Several medicines that cause drowsiness given together. Several that lower blood pressure given together. Anything affecting clotting in a patient who falls. Anything affecting the kidneys in a patient who is dehydrated. A student cannot memorise an interactions table and does not need to; recognising these four patterns catches a large share of what actually harms patients on a medical ward.
Choice of medicine, dose, route and frequency are prescribing decisions and appear nowhere in this text. What belongs to nursing is checking, giving safely, observing afterwards, recording honestly, questioning a prescription that looks wrong, and never giving something you do not understand. That last one is a professional obligation everywhere and is the one students find hardest to act on in front of a prescriber.
The four groups that dominate deaths worldwide — cardiovascular disease, cancer, chronic respiratory disease and diabetes — are largely managed rather than cured, and the patient goes home to live with them for years. That changes what good nursing is. A patient who leaves with their symptom controlled and no idea how to manage it at home has been treated and not cared for, and they will be back within weeks. Readmission is a nursing outcome more often than it is a medical one, and the part that fails is almost always education, follow-up or the practical ability to carry out the plan.
When somebody does not take a treatment, the reasons are ordinarily concrete: cost, distance, side effects they were not warned about, a regimen too complicated to follow, no water to take it with, nobody to remind them, or a belief about the illness that nobody asked about. Calling this non-compliance names the patient and closes the inquiry. Asking what gets in the way opens it, and in a surprising number of cases the obstacle is something a nurse can solve in one conversation.
Short sentences, one idea at a time, in their language, demonstrated rather than described where a skill is involved, repeated across more than one occasion, and checked by asking the person to say back what they will do. Whatever else there is time for, they should leave knowing the two or three changes that mean come back now. Where the nearest facility is hours away, what the family knows determines when the patient arrives — and they are the people who will actually do the dressing, give the feed and notice the change.
Poverty, housing, food, work, transport, literacy and whether anybody is at home determine outcomes in chronic disease at least as much as treatment does. A nurse cannot fix any of them and can do two things that matter: ask, so the plan is built around the life the patient actually has rather than an imagined one, and record what is missing so it is visible to whoever can act. A discharge plan that assumes a refrigerator, a bathroom and a relative who does not work is a plan for somebody else.
Almost nobody arrests without warning on a medical ward. In the hours before, the observations drift, somebody records a rate that was estimated rather than counted, a concern is raised and reassured away, or a patient says they feel terrible and is given a drink. Reviews of in-hospital arrests find the same pattern repeatedly: the information existed and nobody assembled it. The practical consequence for a student is that the most valuable emergency skill is the one used hours earlier — counting properly, reading the trend, and escalating a worry that has not resolved.
Rapid onset after an exposure, with airway, breathing or circulatory compromise, usually with skin changes. It is a call-for-help-immediately condition. Nursing actions are to stop the trigger, summon emergency assistance, position the patient — flat with legs raised where circulation is compromised, sitting up where breathing is the main problem, and never stood up suddenly — and assist the emergency response. Treatment is prescribed and appears nowhere here; what a nurse contributes is speed and position, and position genuinely changes survival.
Direct, firm, sustained pressure, the patient flat with legs raised, kept warm because cold blood clots badly, help called early and by name, access established where that is within your scope, and everything recorded with times. Visible loss underestimates true loss, often enormously, and a young patient compensates until they do not. Weighing swabs and linen where a service does it is far more accurate than the estimate by eye that almost everybody makes.
Say what is wrong, what the observations are, what you have done, and what you want. Send a named person for the team rather than appealing to the room, because a request addressed to everybody is accepted by nobody. Stay with the patient. Write the times down as they happen, because nobody reconstructs them accurately afterwards and the times are what allow the event to be reviewed honestly. None of this is difficult and all of it is done badly under adrenaline unless it has been rehearsed.
Almost every question in this subject gives you a patient and asks what the nurse does first or next. The correct answer addresses the most urgent risk, stays inside nursing scope, and involves telling somebody rather than deciding alone. Options that treat a symptom without assessing, adjust a prescribed treatment, reassure instead of escalating, or wait for the next round are written to catch the well-meaning.
A falling level of consciousness. A rising respiratory rate. Reduced work of breathing in a patient who is still unwell. A falling urine output. New confusion. Pain out of proportion. A fever in a patient with low white cells. Non-blanching redness. A limb that is cold, pale or pulseless. Learn these as a list; they cut across every system in this manual.
For each: what the organ does, what failure looks like, what you assess, what you do. Four answers per system, then the five interactions from the last chapter. That is a revision plan that fits on two sides of paper and covers the majority of what a medical-surgical paper will ask, because the papers are built on the same scaffold.
That recognition, not treatment, is the nursing contribution in nearly all of this. That the earliest signs are free — rate, effort, perfusion, output, consciousness. That a patient who feels different usually is. And that the scaffold of one system at a time is something to build with and then set aside, because the person in the bed has never read the syllabus. What survives from this manual, if nothing else does, is the list of findings that always mean escalate — they cut across every system here, they are free to obtain, and acting on them early is the whole of what a ward nurse contributes to somebody surviving.