Medicine first pass: how to get through the big subject without drowning

General Medicine is the subject that makes people quietly nervous. It's the biggest textbook on the shelf. It touches every organ. It borrows from physiology, pathology, pharmacology and microbiology all at once. And every time you open it, it seems to ask you to hold a hundred new facts that all look alike.

If you're starting your first pass, the worry is usually the same: where do I even begin, and how will I know when I've done enough to move on? This article is a plan for that first pass. It isn't a list of diseases to memorise. It's a way to organise the subject so that each hour you spend adds to a structure instead of piling onto a heap.

What a first pass is for

A first pass is not mastery. Its job is to give you a map. By the end of it you should be able to open any chapter and know roughly what's in it, which three or four conditions carry the weight, and where your gaps are. The detail comes on the second and third passes, when you already have somewhere to hang it.

People get into trouble when they treat the first pass as the final one. They try to learn every rare syndrome in the heart chapter before they've understood heart failure. They stall, they get tired, and they never reach the respiratory chapter. A first pass that is fast and slightly shallow beats a slow one that is perfect and unfinished.

So give yourself permission to skim the rare and the exotic. Mark them with a small symbol and come back later. The aim of this pass is breadth with a spine.

Organise by organ system, then by a fixed template

The most useful thing you can do on day one is pick the order. Go system by system: cardiovascular, respiratory, gastrointestinal and liver, renal and fluid-electrolyte, endocrine, haematology, neurology, infectious disease, rheumatology and the rest. Finish one before you start the next, so that related ideas sit close together in your memory.

Within each system, use the same template for every condition. A simple one:

• How does it present? The story and the signs a patient actually brings.
• What's the mechanism? One or two lines on why it happens.
• How do you confirm it? The investigation that moves you from suspicion to diagnosis.
• How do you treat it, and what are the emergencies? First-line principles, and what you must not miss.
• What does it get confused with? The one or two look-alikes.

A template does two things. It makes you read actively, because you're hunting for answers to the same five questions each time. And it makes revision easy, because every disease has the same shape. Two weeks later, when you can't remember what you read about nephrotic syndrome, you only need to ask the five questions.

Learn the pattern before the disease

Medicine is full of repeating patterns, and spotting them saves enormous effort. Here are a few that earn their keep.

Heart failure, whatever the cause. Learn it once as a syndrome: the forward failure (tiredness, poor perfusion) and the backward failure (congestion). Left-sided failure congests the lungs and gives breathlessness, orthopnoea and crepitations. Right-sided failure congests the systemic veins and gives a raised jugular venous pressure, hepatic congestion and ankle oedema. Once you hold that picture, the individual causes, drugs and complications slot in.

Anaemia by cell size. Start with the mean corpuscular volume. Small cells point to iron deficiency, thalassaemia trait or chronic disease. Large cells point to vitamin B12 or folate deficiency, alcohol, liver disease or hypothyroidism. Normal-sized cells in a patient with anaemia raise the question of blood loss, haemolysis, marrow problems or chronic disease. That one split organises an entire chapter.

Hyponatraemia by volume status. Ask whether the patient looks dry, normal or overloaded. Dry points to losses (gut, kidney, skin). Overloaded points to heart, liver or kidney failure with water retention. Normal volume is where you start to think of the syndrome of inappropriate antidiuretic hormone secretion, hypothyroidism and adrenal insufficiency. Again, one question turns a pile of causes into three branches.

Jaundice as before, in and after the liver. Is the problem in bilirubin production or uptake, in the hepatocyte, or in the flow of bile out? The pattern of conjugated and unconjugated bilirubin, together with the liver enzymes, tells you which. Without that frame, the jaundice chapter is a list. With it, it's a story.

Acute kidney injury as pre-renal, renal and post-renal. Poor perfusion, damage to the kidney itself, or obstruction below. The investigations and the treatment follow from which one it is.

Whenever you find yourself memorising a long list of causes, stop and ask whether there's a split, a question that sorts them into a few branches. There nearly always is.

Link every investigation to a diagnosis

This is the habit that separates comfortable candidates from anxious ones. In medicine questions, an investigation is almost never an isolated fact. It's the step that confirms or rules out something in particular. So when you read about a test, don't write it down as a stand-alone fact. Write it as a pair: this finding, this diagnosis, and the reason why.

Some examples of the kind of pairing that works, all textbook-level:

• Raised troponin with a suggestive history points to myocardial injury. The ECG then tells you which part of the heart. Changes in the inferior leads suggest the inferior wall, which is usually supplied by the right coronary artery.
• In an ascitic patient, the serum-ascites albumin gradient separates ascites due to portal hypertension (high gradient) from ascites due to causes like peritoneal disease (low gradient). The gradient is only a tool for sorting the cause.
• In a pleural effusion, comparing pleural fluid with serum protein and lactate dehydrogenase (the criteria usually credited to Light) separates exudates from transudates. Transudates point you to heart, liver or kidney failure. Exudates point you to infection, malignancy and inflammation.
• In diabetic ketoacidosis, you expect high glucose, ketones and a metabolic acidosis with a raised anion gap. If the acidosis isn't there and the glucose is very high with marked dehydration, you start thinking of the hyperosmolar state instead.
• In an acid-base question, decide first whether the pH is acidic or alkaline, then whether the primary change is respiratory or metabolic, then whether the body is compensating, then (for a metabolic acidosis) whether the anion gap is raised.

Notice that none of these is "memorise a normal value." They're about what a result means. If you do learn reference ranges, learn the handful that decide management and be sure to check them against your standard textbook.

When you finish a chapter, try a quick test: cover the diagnoses and read only your list of investigations. Can you say what each one is hunting for? If you can, you've turned lab values into reasoning.

Handling guidelines carefully

Medicine is the subject where guidelines multiply. There are national and international bodies, and they update at different times. Hypertension targets, diabetes treatment sequences, lipid thresholds, definitions of various syndromes: these change, and different guidelines don't always agree with each other.

That creates a real risk for you. If you memorise a number from one source and the exam question, or the latest edition of your textbook, follows another, you lose marks and confidence for no good reason. Here's a sensible way to handle it.

Learn the principle first and the number second. Know why a blood pressure target is tighter in a diabetic patient with kidney disease, or why a certain drug class is preferred in heart failure. The reasoning stays true across editions. The cut-off figure may not.

Note the source next to any number. When you write down a threshold, add a few words: which book or guideline, which edition or year. Later, if a different source disagrees, you'll know it's a version difference and not a mistake.

Don't assume the exam follows the newest paper. Whether and how quickly new guideline changes appear in the exam is not something anyone outside the examining body can promise. Check the official notices from NBEMS and NMC for the syllabus and any announcements, and treat anything else as unconfirmed.

Keep a "disputed or changing" list. A single page where you jot down topics where sources disagree. Review it occasionally, and when you can, resolve each item from the most authoritative source available to you.

None of this means ignoring guidelines. It means holding the numbers loosely and the logic tightly.

A pass plan you can actually follow

Here's a way to structure the first pass so that it finishes.

Step 1: Skim the whole system first, in one sitting. Read the headings, the summary boxes and the tables of the system you're about to study. Don't try to learn it. You're just seeing the territory.

Step 2: Pick the five or six big conditions. In cardiology that might be ischaemic heart disease, heart failure, hypertension, arrhythmias, valvular disease and cardiomyopathies. In each system there is a core. Cover those properly with the template.

Step 3: Tag the rest. Rarer conditions get a one-line note: what it is and what it's confused with. That's enough for now.

Step 4: Test yourself the same day. Do a short set of questions on the system you just covered. It will feel clumsy, and that's fine. You're finding out what you didn't absorb while it's still fresh. NextPrep's practice questions can serve for this, though any good question bank will do.

Step 5: Make cards from what you missed. Not from everything you read. From what you got wrong or guessed. Those are the facts that need rescuing.

Step 6: Move on. This is the hard one. When the five questions are answered for the core conditions and your test shows no glaring hole, go to the next system. You'll be back.

Don't let the emergencies fall through

Medicine questions have a fondness for emergencies, so make a separate short list as you go. Each system has a few: acute coronary syndrome, acute pulmonary oedema, pulmonary embolism, asthma exacerbation, upper gastrointestinal bleed, diabetic ketoacidosis, hypoglycaemia, hyperkalaemia, status epilepticus, stroke, sepsis, and so on.

For each one, write the same four lines: how do I recognise it, what is the first thing I do, what do I confirm, and what do I avoid. Keep the list on a single sheet or a small deck of cards and read it often. Emergencies reward clear, rehearsed thinking, and they're easier to rehearse in a compact list than inside chapters.

Where first passes go wrong

Starting with the rare stuff. The syndromes at the end of the chapter are tempting because they're interesting. They're also the least likely to repay your time. Do the common conditions first.

Keeping the whole thing visible

The most reassuring thing you can have in a subject this big is a one-page tracker. List the systems down the side and put three columns beside them: first pass done, questions attempted, cards made. A glance should tell you where you are. Seeing the first pass close to completion does something nothing else does: it shrinks the monster. Many students find that a subject they dreaded looks quite finite on a single sheet.

If you'd like help sizing the work against your remaining time, a free assessment can give you a starting picture of where you are, and the study plans page shows how NextPrep sequences subjects. Neither replaces your own judgement, and neither guarantees an outcome. They're tools for deciding what to do next.

The short version

• A first pass gives you a map, not mastery. Aim for breadth with a spine.
• Go system by system and use one template for every condition.
• Look for the split that sorts a long list of causes into a few branches.
• Pair every investigation with the diagnosis it supports and the reason.
• Learn guideline principles first and numbers second, note the source, and check official NBEMS and NMC notices for anything about the exam itself.
• Test the same day, card your mistakes, and move on when the core is solid.
• Keep a separate short list of emergencies.

What to do this week

1. Pick one system (cardiovascular is a good start) and skim it in one sitting for ten or fifteen minutes, just headings and summary boxes.
2. Choose its five or six core conditions and write the five-question template for each, in your own words and on a single page apiece.
3. Pair investigations with diagnoses. For each core condition, write the one result that confirms it and one that excludes its closest look-alike.
4. Do a short question set on that system and make cards only from the questions you missed or guessed.
5. Start your "disputed or changing" page and add the first two numbers you've met where your sources disagree, with the source beside each.