GI Bleeding and Obstruction, and the Red Flags Between Them

An abdominal stem gives you pain and not much else at first. Bleeding and obstruction can both sit quietly for a while, and both can turn in a single shift. What separates them is what comes out of the patient, and what the abdomen is doing while you watch it.

Findings that say this is active bleeding

Start with what you can see. Vomit containing bright red blood means active bleeding higher up, and vomit that looks like coffee grounds means blood that has been sitting in stomach acid for a while.

Then look at the other end. Black, tarry, strong-smelling stool points upward in the tract, because the blood has been digested on the way down, while bright red blood suggests something lower or something bleeding fast.

Neither of those is a finding you sit on. Both are reported, and the description you give matters as much as the fact.

The patient tells you the rest. Rising pulse, dizziness or faintness on standing, pallor, cool clammy skin, thirst, restlessness and a falling blood pressure describe a circulation losing volume.

Note the order there. The pressure falls last, which is why an early bleed can present with a normal reading and a patient who simply feels unwell. The reasoning behind that lag is set out in shock states and the earliest changes worth catching.

Ask about the ordinary things too. Anti-inflammatory use, anticoagulants, alcohol, previous ulcers and liver disease all raise the likelihood, and they are in the stem for a reason when they appear.

Findings that say this is obstruction

Obstruction is a plumbing problem and it presents like one. Cramping pain that comes in waves, a distended abdomen, vomiting, and no flatus or stool passing at all.

Bowel sounds change in a recognisable order. High-pitched and hyperactive above the blockage early, then diminishing, then absent as the bowel tires and gives up.

Absent bowel sounds are the worrying end of that sequence, not the reassuring one. A silent abdomen in a distended, vomiting patient is reported immediately.

Vomiting changes character as time passes. It starts as stomach contents and, in a lower obstruction left long enough, becomes foul and faeculent, which is a late and serious description.

The abdomen itself is part of the assessment. Distension you can measure, tympany on percussion, tenderness, and a board-like rigid abdomen that suggests something has perforated and needs escalating at once.

Fluid is the hidden danger here. Litres can sit trapped in the bowel while the patient dehydrates, so the observations look like a volume problem even though nothing has been lost outside the body.

Where the two overlap, and how to separate them

Both can present with pain, nausea and a patient who looks unwell without looking dramatic. Overlap is why these two get taught together, and why a stem can afford to be subtle.

Use the exits. Bleeding announces itself through vomit or stool, while obstruction announces itself by nothing leaving at all, and those two facts point in opposite directions.

Use the abdomen. A bleed does not usually distend it, and an obstruction almost always does.

Then use the timeline. A bleed can change the observations within minutes, while an obstruction usually builds over hours with cramping that comes and goes.

Older patients blur all of this. Pain may be vague, the temperature may not rise, and the first clear sign may be new confusion, which is a reason to raise your suspicion rather than lower it.

What gets reported straight away

For a PN or LPN candidate this is the core of the item, because accurate observation and fast, precise reporting is the contribution the exam is testing.

Do not wait for the next scheduled observation round to pass any of that on. Report at the time, to the registered nurse, with the actual finding rather than a summary of your impression.

Ranking which result gets escalated first when several are abnormal is a skill of its own, and it is worked through in which lab result do you report first.

Positioning and what goes in by mouth

Assume nothing by mouth until someone has decided otherwise. Both conditions are potentially surgical, and both make aspiration a genuine risk.

Sit the patient up if they are alert, which eases a distended abdomen and protects the airway. If they are drowsy and vomiting, side-lying is safer than upright.

A nasogastric tube on suction is common in obstruction, and there is real nursing work attached. Measure and describe the drainage, keep the tube secure and patent, check placement per policy, and give frequent mouth care to a patient who cannot drink.

Record output carefully from every source. Vomit, drainage and stool all count, and the fluid balance chart is the evidence someone else will make a decision on.

Describe what you see rather than interpreting it. Colour, amount and consistency belong in the note, because the person deciding what happens next was not standing there when it happened.

Comfort measures still matter while all of that is going on. Mouth care, a clean gown, privacy during vomiting and an explanation of why they cannot drink are the parts of this the patient will remember.

An older patient being fluid resuscitated needs watching from the other direction as well, since replacing volume quickly has its own consequences. Those findings are covered in heart failure findings that drive the priority.

A patient on chemotherapy with abdominal bleeding carries a second set of precautions at the same time, described in neutropenic precautions and what changes on the unit.

The question that sorts most stems

What is coming out, and is the abdomen moving? Blood in either direction points one way. A silent, swollen abdomen with nothing passing points the other, and the wider system order behind both is in the med-surg reasoning order.