Podcast 10 – Cardiogenic Shock

heart small Mohamed, a listener from Sudan, emailed asking about the treatment of acute pulmonary edema in patients with low blood pressure. This is in distinction to SCAPE patients (see podcast 1).

If the patients have pulmonary edema and low BP from a cardiac cause, then they are in cardiogenic shock.

First, consider the etiology:

  • Rate-related
  • Valve Disorder
  • Ischemic (Right sided infarct, STEMI, NSTEMI)
  • Cardiomyopathy
  • Toxicologic

At the same time, you are treating the patient with:

  • Inotropes (dobutamine, milrinone, calcium)
  • Pressors to achieve a MAP > 65 (allows coronary perfusion)
  • Oxygenation support, most likely with intubation
  • Optimize O2 carrying capacity (Hb>10)
Play

You finished the 'cast,
Now get CME credit

Already an EMCrit CME Subscriber?
Click Here to Get CME Credit for the Episode


Not a subcriber yet? Why the heck not?
By subscribing, you can...

  • Get CME hours
  • Support the show
  • Write it off on your taxes or get reimbursed by your department

Sign Up Today!

.

Subscribe Now

If you enjoyed this post, you will almost certainly enjoy our others. Subscribe to our email list to keep informed on all of the ED Critical Care goodness.

This Post was by , MD, published 5 years ago. We never spam; we hate spammers! Spammers probably work for the Joint Commission.

Comments

  1. Hey Scott,

    Great lecture. I had a question on how to manage severe AS patients with heart failure in your ED. Conventional wisdom has taught that we should not vasodilate this patient because it can produce a precipitous drop in BP, since the heart can’t increase cardiac output against the fixed stenosis. But I am aware of one study in NEJM where they gave nitroprusside and it improved cardiac output. What do you recommend? Also what are your thoughts on nicardipine for SCAPE?

    Raghu

  2. Hey Scott, and to the other readers out there!
    I am in my first year of practice, and since my 2nd year residency I’ve been listening to these podcasts, I think they are awesome, and love every bit of it. I just wanted to share my first case of cardiogenic shock that I managed just 2 days ago according to your teachings. Wonderful. It was the end of my shift 5 minutes before midnight, and this 65 yo male is wheeled in by EMS, had been complaining of Chest pain for 1 hour, was pale, diaphoretic, had a pulse of 35 and a BP that had dropped in the ambulance to 85/55 from a previous 130 systolic. He was alert and oriented and initially had warm feet and clear lungs. He had a history of heart disease but was a poor historian. EKG showed new flipped T waves in the anterolateral leads and a new 3rd degree AV Block with afib. Bedside EDE showed a grossly preserved EF. I started him on ASA, Plavix and Heparin from the get go and tried 2 atropine and a 500 cc Bolus. No improvement. Since he was on Beta-blokers I tried to reverse them with CaCl and Glucagon, no changes. Started him on Dobutamine first, then added Levophed. His BP improved minimally despite titration but HR did not. Transcutaneous pacing was unsuccessful and painful. I intubated him with RSI etomidate and succs, and tried pacing again, no changes ( I was pacing his pectorals ). His HR by this point fell down further to 28, 22 and he went into PEA. 2 min of cardiac massage and some more atropine and epi got him back to baseline. I had no on call cardiology and the closest centre was 1 hour away by ambulance. Finally managed to get ahold of a local cardio that was not on call and he placed a transcutaneous pace that finally stabilized the patient.
    Thank you Scott for your teachings, I remembered your podcast as I was managing this case and listened to it the next day for further validation. A phone FU 2 days later showed that the patient was extubated and off pressers, awaiting his definitive pacemaker.

  3. Eric Sauvageau says:

    Hi Dr Weingart,

    great articles with great references. I was wondering if you also had a reference nearby for the use and efficacy of CaCl as an inotrope?

    Thank you!

    Eric Sauvageau

  4. Hi Scott! I’d like to thank you again for all your educational material. O a recent shift, I used information I’ve learned from at least three of your podcasts on different critically ill patients.

    I was hoping for some advice. I had a patient in cardiogenic shock from an inferior wall STEMI with a heart rate in the 30-40s, a MAP around 50, massive JVD and pulmonary edema though not in respiratory distress. EMS had given him a dose of atropine which temporarily raised his HR to the 50-60s with improvement in his chest pain but not BP.

    I’m in a very small community hospital with the nearest cath lab about an hour away, and this guy wasn’t stable enough for transport anyway. He had a history of multiple craniotomies for head injuries (in Vietnam), history of 6 cm AAA, surgery within the last 3 months with subsequent GI bleed, and a wide mediastinum on CXR … I had the nurses put the TNK back in the box!

    I gave him 1L of NS, amp of Calcium chloride, and tried transcutaneous pacing but couldn’t get consistent capture with levels he could tolerate even with some fentanyl and versed. I used one dose of push dose epi which raised his HR and alleviated some of his pain, then ordered norepi to treat the cardiogenic shock. I was a bit worried about increasing his myocardial oxygen demand but figured he was already in bad shape.

    Shortly after the NE started, I got his MAPs around 65-70 and his HR around 100, and he felt good … then his HR skyrocketed to 180 and quickly progressed to VT. I was able to cardiovert him a few times, but then he coded and developed VF and his wife and I decided to make him DNR.

    Do you have any advice on managing him without a cath lab? The nurses were bugging me about atropine, but I thought it would only be a temporary solution, as I don’t think you can run an atropine drip. Maybe ketamine with transcutaneous pacing? Intubate, propofol, norepi, and pacing? Transvenous is not an option, because I don’t even think we have the generator, plus it would take me too long since I’ve only done a few.

    In retrospect, the only thing I can think to have done differently was discuss end of life wishes with him and his wife prior to starting the norepi, since I strongly suspected he wouldn’t survive. We were generous with the Fentanyl thoughout, though.

    Thanks!

    • Wow, sounds like you did amazing work! My threshold to intubate would have been nil; then you can up your trans-cut pacing to where you want at that point and you’ve markedly lowered the metabolic requirements. Also positive pressure vent has the potential to bolster squeeze (referred to confusingly as decreased afterload). The whole stressing the heart becomes academic in these circumstances. You need to perfuse heart and brain. Pressors for MAP of 65, then inotropy until hands feel warm is usually how I play. Love that you thought of calcium, it is critical.

      Sounds like end-of-life issues were primary just as you mentioned.

      Strong work!

    • John Greenwood says:

      Man Mike, nice job given the resources you had! Only two things this patient made me think of is maybe initially using dopamine over NE for the chronotropy + an inotrope? Also, thought you were gonna say his K came back at 9… HyperK always being a thought with Symptomatic bradycardia refractory to pacing… Regardless, awesome job.

      • John,

        great thought on the hyperK. Norepi is actually the pressor of choice for cards shock based on SOAP trial http://www.nejm.org/doi/full/10.1056/NEJMoa0907118

        • John Greenwood says:

          Agreed. The De Backer study was a game changer for NE ,but in their study the patients were mostly tachycardic to start. Would you apply the findings in the SOAP Study to all-comers in cardiogenic shock?

          Dopa is definitely down, but I’m not sure the final nail is in the coffin…. I believe that in the upcoming Surviving Sepsis Recommendations there will still be a rec for Dopa as an alternative for a select group of patients (those with bradycardia).

          The funny thing is, this patient unfortunately progressed to vtach/vfib and if dopa would have been used it would have gotten blamed. Ah well. Maybe could have gone with a good old precordial thump.

          • I just think dopamine is a dirty drug that brings nothing to the table. Rather titrate norepi and dobut independently. If you really want a drug for brady hypotension, epi prob. makes more sense than dopa.

  5. Thanks for great effort
    Now many icu/anesthesiologist still believe in dopamine as first choice for cardiogenic shock due to its beta agonist features ..they claim that norepi is worsening the heart because you are constricting the basculature and making high resistance for a sick heart to pump! any way the SOAP trial showed the actual answer. ..
    Now what about dobutamine infusion and at what systolic BP we can start?And how often we see the vasodilatory effects of it?
    I had a patient with new onset flash pulmonary edema with BP 220 systolic and saturation of 60% who was treated initially with lasix abd morphine and metoprolol then transferred to me.. on arrival he was obtunded with bp 97/50. Pulse 80 co2 70 ph 7.24… I intubated him with fent and atracurium (due to suspicion of hyperK) 1mg of midaz…. he developed marked hypotension with levophed 20 and dopamine 25 mic going on bp 120 systolic. . When I started dobutamine’ the bp start to drop and didn’t responde to increasing the other inotropes…
    Second question.. is it possible that he migh develop transient worsening of LV sys function after intubation?
    Thank you again and thanks to the readers

    • The rule of thumb with dobutamine is that 1/3 will increase BP, 1/3 will stay the same, and 1/3 will drop. No literature to support that. So I like to see a MAP of >60 before I’ll add it in. Though the beauty is you can just turn it off if BP drops.

      As to your APE pt, I wonder if the problem wasn’t volume depletion. It is why I avoid lasix early on. Little downside to trying these patients on some fluid in these cases. Other possibility is hypocalcemia. Volume and calcium are the main failures of inotropes.

      • HASSAN ALMAATEEQ says:

        I think if high dose NTG was started instead of lasix might have better outcome.. but when i received this patient, IVC was > 1.5cm with no respiratory variation in diameter, that’s why i tried only 500cc NS without response.. any comment regarding Atracurium-related ?hypotension??

  6. Hey Dr Weingart. Thought I’d drop a line and thank you for your great podcasts. I’m a fourth year med student and just happened to find your podcasts during my ED rotation. Your podcasts are a fantastic resource. Thank you for taking the time and effort to put them together.

  7. Hon Liang says:

    Correct me if I am wrong: strictly speaking diastolic BP correlates better with coronary perfusion. Vasopressors elevate SVR and increase diastolic pressure. This increases coronary perfusion of the LV, which occurs usually in diastole.

    That being said, MAP target of 65mmHg is reasonable given that it is the most accurate value from oscillimetry. In addition, DBP is a calculated value when using NON-invasive/DINAMAP.

    But if an arterial line is in place, I would prefer to look at the diastolic value.

Speak Your Mind (Along with your name, job, and affiliation)