The Blood Pressure Is Dropping...

Cut to the Chase: General Surgery Survival Series — Post 26

A liter of fluid will raise almost anyone's blood pressure for a while. That is the problem with it.

The nurse calls with 82/44. You order 500 of crystalloid, and eleven minutes later the cuff reads 106/62. Something in your chest unlocks.

You write responded to fluid bolus and you go back to the workroom.

That sentence is true, and it is not an answer.

The bleeding patient comes up. So does the septic one, and so does the patient who is simply dry. What you needed to know was how long she would hold.

Before any of it, spend thirty seconds on whether the number is real, and spend them while you are already walking. A cuff too small reads high, a cuff too large reads low, and an arm hanging off the bed reports its own weather.

Check the cuff size and where the arm is sitting on your way into the room, not from the workroom. It takes ten seconds, and it is the only part of this you can settle before you get there.

Then stop auditing and go put your hand on her.

Forearm first, then knee. Ask her something that takes a real answer instead of asking whether she is okay.

A warm knee under a low pressure points at the pipes. A cold knee points at the tank or the pump. Two seconds, one hand, and no monitor performs it for you.

Cool to the mid-shin, slow to answer, an empty bag. She is paying for that number with something, and the price is going up.

Before the differential, read the last hour of the chart. Propofol for a dressing change. An epidural bolus at four.

Home antihypertensives quietly restarted at eight. Most of what drops a pressure in a hospital was ordered on purpose by somebody with good reasons.

Then the fluid, and give it like a test rather than a gesture. Five hundred of balanced crystalloid, wide open. Before it runs, say out loud what you expect it to do and by when.

Five hundred fast tells you something. The same five hundred over an hour tells you nothing, slowly.

Then be there at ten minutes, and again at thirty.

Three things can happen. The pressure does not move, which is bad and at least honest. It comes up and stays up, and you had a dry patient. Or it comes up, and across the next half hour it walks quietly back down.

That third one deserves a name, and naming it is most of the work. A transient responder rises with volume and falls again inside half an hour, which after an operation means a container with a hole in it and a loss you have not found.

After the bolus, go back and feel the knee rather than waiting on the next cuff. The pressure comes up first, and it comes up in patients who are still bleeding.

Inside the first forty-eight hours after an operation, that patient is bleeding until somebody proves otherwise, and a hemoglobin drawn twenty minutes after the blood left the body is not that proof.

Look under the dressing. Put a hand on the belly. Find out what the drain looked like two hours ago, and who emptied it.

Test the edge of that. On day five the same pattern is more often a leak, and she runs warm rather than cool, with a white count climbing and a belly that has stopped behaving.

Septic patients transiently respond too. The mechanism differs and the urgency does not.

There are four ways a pressure falls. The tank is empty, the pipes are open, the pump is failing, or something outside the pump is squeezing it.

The young are the trap running the other way. A thirty-one-year-old holds 118 systolic through a liter and a half of loss, holds it while you round, holds it while you write, and then arrives at 70 with no middle for you to notice.

In anyone under forty, watch the heart rate and the skin instead of the systolic. The body gives up the pressure last, and it gives it up all at once.

Pressors are the only drug in the building that makes everybody feel better instantly, including the people not receiving them. Started for a reason you can say out loud, a pressor is a bridge. Started to quiet the monitor, it is an expensive way to lose someone under a reassuring number.

I have been on the wrong side of this. As a junior resident I was following a man admitted late the night before and taken out for a right hemicolectomy that morning.

By evening he was 84 systolic. I ordered a liter, watched it come up to 108, and told the intern to keep an eye on it. I meant that sincerely.

Forty minutes later he was 76 and gray, and we were opening him in a room nobody had booked.

When the number comes back better and your shoulders drop, that is the moment to pick the next time you will look. The relief is the part to distrust.

So carry it upstairs in a shape somebody can act on. She was 82/44, came up to 106 with 500 wide open, and she is back to 88 twenty-five minutes later. She is a transient responder, two units are ordered, and I need you here.

Somewhere in the next twenty minutes the cuff will produce a number that lets the whole room breathe out.

Pick your time before you hang it, and be standing there when it comes.

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What to Read Next: Post 27, “I Wasn't Sure Yet.” Calling that pressure upstairs took one clear sentence because the thought was finished. Next: what to do with the one that isn't finished yet, while it can still be used.