All posts by The Trauma Pro

What the heck?

What Would You Do? Nail In The Neck

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Here’s a very interesting case for you. A construction worker was carrying an object inside a building WHILE HOLDING HIS NAIL GUN! As he passed through the door, his elbow hit the frame and he brushed his neck with the business end of the gun. Guess what happened?

He experienced sharp pain, then noted pain every time he swallowed. He checked himself out in the mirror, and there was a small puncture wound in the right side of his neck. He presented to his local ED, with the complaints just noted. He was hemodynamically stable and neurologically intact. His airway was patent, and he had minimal pain. The following image was obtained. The nail measures about 6cm in length.

Let me know (by X or comments) what additional information you think you need. I’ll discuss that in my next post. Then we’ll figure out what to do about this problem.

Resuscitation

Hypotensive Patient? You’ve Got 90 Seconds!

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You’re running a trauma activation, and everything is going great! Primary survey – passed. Resuscitation – lines in, fluid going. You are well into the exam in the secondary survey.

Then it happens. The automated blood pressure cuff shows a pressure of 72/44. But the patient looks so good!

You recycle the cuff. A minute passes and another low pressure is noted, 80/52. You move the cuff to the other arm. Xray comes in to take some pictures. You roll the patient. 76/50. Well, you say, they were lying on the cuff. Recycle it again.

A minute later, the pressure is 56/40, and the patient looks gray and is very confused and diaphoretic. It’s real! But how long as it been real? An easy 5 minutes have passed since the first bad reading.

Bottom line: Sometimes it’s just hard to believe that your patient is hypotensive. They look so good! But don’t be fooled. If you get a single hypotensive reading, STOP! You have 90 seconds to figure out if it’s real, so don’t do anything else but. Check the pulse rate and character with your fingers. Do a MANUAL blood pressure check. It’s fast and accurate. If you have the slightest doubt, ASSUME IT’S REAL.

Don’t get suckered into trying to figure out what’s wrong with the cuff despite how good your patient looks. Remember, your patient is bleeding to death until proven otherwise. And it’s your job to prove it. Fast!

Equipment

The Lowly Blood Pressure Cuff: Is It Accurate?

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Yesterday, I described how the typical automated oscillometric blood pressure cuff works. We rely on this workhorse piece of equipment for nearly all pressure determinations outside of the intensive care unit. So the obvious question is, “is it accurate?”

Interestingly, there are not very many good papers that have ever looked at this! However, this simple question was addressed by a group at Harvard back in 2013. This study utilized an extensive ICU database from 7 ICUs at the Beth Israel Deaconess Medical Center. Seven years of data were analyzed, including minute by minute blood pressure readings in patients with both automated cuffs and indwelling arterial lines. Arterial line pressures were considered to be the “gold standard.”

Here are the factoids:

  • Over 27,000 pairs of simultaneously recorded cuff and arterial line measurements from 852 patients were analyzed
  • The cuff underestimated art line SBP for pressures at or above 95 torr
  • The cuff overestimated SBO for pressures below 95 torr (!)
  • Patients in profound shock (SBP < 60) had a cuff reading 10 torr higher
  • Mean arterial pressure was reasonably accurate in hypotensive patients

sbp-cuff-v-aline

Bottom line: The good, old-fashioned automated blood pressure cuff is fine for patients with normal pressures or better. In fact, it tends to understimate the SBP the higher it is, which is fine. However, it overestimates the SBP in hypotensive patients. This can be dangerous! 

You may look at that SBP of 90 and say to yourself, “that’s not too bad.” But really it might be 80. Would that change your mind? Don’t get suckered into thinking that this mainstay of medical care is perfect! And consider peeking at the mean arterial pressure from time to time. That may give you a more accurate picture of where the patient really is from a pressure standpoint.

Reference: Methods of blood pressure measurement in the ICU. Crit Care Med Journal, 41(1): 34-40, 2013.

 

Equipment

How Does It Work? The Lowly Blood Pressure Cuff

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The blood pressure cuff is one of those devices trauma professionals don’t give a second thought to. Old timers like me remember using the cuff with a sphygmomanometer and stethoscope to get manual blood pressures. I’ve had to do this twice in recent months on airplanes, and I had forgotten how much work this is.

But technology makes things easier for us. Now you just slap a cuff on the arm (or wrist), push a button, and voila! You’ve got the pressure.

But have you stopped to think about how this actually works? Why don’t we need the stethoscope any more? Here’s the scoop:

When you take a manual blood pressure, the cuff is inflated until a pulse can no longer be auscultated with the stethoscope. The pressure is slowly released using a little thumb wheel while listening for the pulse again. The pressure at which it is first audible is the systolic, and the pressure at which it softens and fades away is the diastolic.

The automatic blood pressure device consists of a cuff, tubing that connects it to the monitor, a pressure transducer in line with the tubing, a mini air pump, and a small computer. The transducer replaces the analog pressure gauge, and the pump and computer replace the human.

The transducer can “see” through the tubing and into the cuff. It is very sensitive to pressure and pressure changes. The computer directs the pump to inflate to about 20 torr above the point where pulsations in the air column cease. It then releases the pressure at about 4 torr per second, “feeling” for air column vibrations to start. When this occurs, the systolic pressure is recorded. Deflation continues until the vibrations stop, representing the diastolic pressure. Each manufacturer uses its own algorithm for this, adding or subtracting a few torr to obtain the most accurate reading for their particular device.

bpcuff

Piece of cake! But here’s the question: is it accurate? In my next post, I’ll write about how the automated cuff compares to an indwelling arterial line.

Abstracts

Best Of EAST 2024 #9: The Burden Of Transferred TBI Patients

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In theory, tiered trauma centers should allow patients with lesser injuries to be treated at lower levels and more severe trauma at higher-level centers. This parallels the resource availability at those centers. In reality, many patients with injuries that seem complex (solid organ, children, and TBI) are transferred due to a “lack of comfort” in taking care of them or the perception that they may deteriorate quickly.

The truth is that many, if not most, of these patients are discharged shortly after transfer to the higher-level center, with minimal intervention. This burdens the trauma system in several ways. First, trauma professionals at the lower-level centers slowly lose their skills and comfort in taking care of these patients. The prehospital system is already plagued with low resources and a shortage of personnel. Using one of the only ambulances in a rural area for transport to a distant center takes it out of the community, potentially putting the area population at risk for delayed care.

The University of Arizona at Tucson group performed another TQIP study to highlight this problem. They performed a four-year retrospective analysis of transfer data in patients with isolated TBI with intracranial hemorrhage. They observed the number of transferred patients who required CT scans, ICP monitoring or craniotomy/craniectomy, length of stay, and mortality.

Here are the factoids:

  • Of the nearly 120,000 patients with isolated TBI at Level I and II centers, 45% were transferred from other centers
  • Most patients had GCS 14-15 on arrival, but 10% had GCS 8
  • CT was performed in 58%, and another repeat CT in 4%
  • Four percent underwent ICP monitoring, and 12.5% had a crani
  • Mortality was 6.5%
  • Median length of stay was two days, with a range of 1-5
  • 18% were discharged within 24 hours, and 39% within 48 hours

The authors concluded that, while half of isolated TBI patients were treated at high-level trauma centers, one-third were discharged home within 48 hours with no intervention other than a CT scan. They recommend systemwide guidelines to improve resource utilization.

Bottom line: This straightforward analysis highlights one of the most significant issues facing trauma systems: unnecessary transfer. For decades, Level I and II centers were convenient and always available for transfer, even if the indications were questionable. Then COVID came along and changed everything.

Now, resources are tight everywhere. EMS is underpaid and under-reimbursed, and personnel are difficult to recruit. Hospital personnel of all types face low staffing levels, making it more stressful to provide the level of care we are accustomed to. Skilled nursing facilities, rehab centers, and other outpatient care settings face the same problems.

This has created a domino effect, where the lower-level centers want to transfer a patient but can’t find a bed at the higher-level centers. When they do, it takes forever to get them transported. Then, the higher-level centers can’t discharge them if they need any level of care other than home care.

There are many pieces to this puzzle, but this abstract clearly outlines one of them. Lower-level centers are transferring some patients who could actually be admitted to them. Several reasons may be given, but it typically boils down to the surgeons or the hospitalists not being “comfortable” with certain patients or worrying that they could deteriorate.

This paper does not tease out what kind of isolated TBI the patients had, and I recommend they do. There is a big difference in patients with a subarachnoid hemorrhage (SAH) vs. those with an epidural. The number of patients with SAH is far greater, and the vast majority can go home after a brief (or no) observation. The likelihood of deterioration in patients not on blood thinners is nearly zero. 

State trauma systems and higher-level trauma centers should work with their Level III and IV partners to adopt consistent practice guidelines and protocols to stratify these patients to identify those at low risk. The higher-level centers should provide education to help their referral partners develop a baseline comfort level with these patients. This is the only way we can begin to realign the levels of trauma centers with the levels of care needed by our patients.

Reference: Endless highways: the burden of transferred traumatic brain injury patients in the United States. EAST 2024, Podium paper #42.