Benefits in Early Oral Administration of Beta-blockers during STEMI

Australian study sees benefit in immediate oral administration of beta-blockers

 

 
 
 

David Page, MS, NREMT-P | From the September 2013 Issue | Wednesday, August 21, 2013


Oral or IV?

Hirschl MM, Wollmann CG, Erhart F, et al. Benefit of immediate beta-blocker therapy on mortality in patients with ST-segment elevation myocardial infarction. Crit Care Med. 2013;41(6):1396–1404.

We can all agree prehospital ST-elevation myocardial infarction (STEMI) care has evolved in the last decade. With the widespread availability of 12-lead ECGs, paramedics worldwide have been able to greatly decrease morbidity and mortality for their patients. Now, new research out of Austria points to a further decrease in morbidity and mortality with early oral beta-blocker therapy.

This study included data from five physician/paramedic-staffed ambulance services and six local hospitals, one with a percutaneous coronary intervention center. STEMIs identified by EMS or ED physicians all received multiple anticoagulants.

Whether identified by the EMS physician or the attending ED physician, patients identified as having a STEMI were to receive 2.5 mg of oral bisoprolol within 30 minutes of the first ECG or had it withheld for 24 hours. Patients who presented with symptoms contraindicating beta-blocker administration (i.e., hypotension and heart blockage) were excluded.

Results showed that of the 664 total patients included in the study, 343 patients (52%) received bisoprolol within 30 minutes of ECG confirming STEMI vs. 321 (48%) patients who had beta-blockers withheld for 24 hours. The short-term results alone are compelling, with only five patients who received early bisoprolol dying within 48 hours compared with 19 in the non-immediate group. After data analysis, 30-day all-cause mortality in the immediate administration of beta-blocker group were 0.89% likely to have a fatal cardiovascular event vs. 4.34% in the non-immediate group. Many previous studies have been performed on IV beta-blocker therapy, but this is the first to show promise in the use of oral beta blockers.

Considering that the study parameters required patients to receive beta-blockers within 30 minutes of discovery, the study shows that EMS played a large part in significantly decreasing mortality. This is something the authors acknowledge in their conclusion, suggesting that the administration of beta-blockers be adopted as “an essential part of the emergency treatment of patients with STEMI in the out-of-hospital setting, as the benefit seems to outweigh potential complications.”

Best Judgment

Limm EI, Fang X, Dendle C, et al. Half of all peripheral intravenous lines in an Australian tertiary emergency department are unused: Pain with no gain? Ann Emerg Med. April 23, 2013 [Epub ahead of print].

Coming to us from Australia, this article is a follow-up to 2011 research that showed 23% of all hospital-acquired Staphylococcus aureus (commonly known as staph) infections came from peripherally-inserted IVs (PIVs). This article was a retrospective review of patient charts for all patients presenting to one large metropolitan ED over a 30-day period. Patients with major, life-threatening injuries and illnesses were excluded. Overall, 570 patients had PIVs started. Of those, 284 (50%) went unused during their time in the ED. Additionally, only 62 (22%) patients in the PIV group were admitted to the hospital and of them, 23 patients (45%) had their PIV completely unused 72 hours after admission.

As stated in their limitations, the authors do not account for IVs that are unused but necessary, such as patients with chest pain or seizure patients. There is also not a follow-up as to infection rates in this cohort of patients. It also does not address if unused IVs have a higher infection or adverse reaction rate.

Although much praise is due to the authors for evaluating a procedure that, at times, is unnecessary, EMS providers should continue to use best judgment in starting IVs in the prehospital setting.

Either Way, It Hurts

Chang AK, Bijur PE, Lupow JB, et al. Randomized clinical trial of the 2 mg hydromorphone bolus protocol versus the “1+1” hydromorphone titration protocol in treatment of acute, severe pain in the first hour of emergency department presentation. Ann Emerg Med. May 16, 2013 [Epub ahead of print].

It seems like a lot of what we do in EMS relates to pain management. With the advent of synthetic opiates, such as fentanyl (Sublimaze), as well as hydromorphone (Dilaudid), prehospital pain management has never been more effective; however, in patients with acute pain, should we give a large bolus of opiate, or titrate to effect?

The authors, from Montefiore Medical Center in the Bronx, N.Y., performed a randomized, clinical trial for patients presenting with acute (less than seven days old) pain, in which patients were given either 2 mg of intravenous hydromorphone or 1 mg followed by a second dose of 1 mg 15 minutes later (“1+1”) if the patient requested further intervention. The authors’ hypothesis: “2 mg intravenous hydromorphone administered initially as a single intravenous bolus would provide superior analgesia at 60 minutes … compared with the ‘1+1’ intravenous hydromorphone titration protocol.”

A total of 350 patients were randomized by computer to receive either 2 mg bolus or the “1+1” titration protocol of hydromorphone. Patients with chronic pain syndrome were excluded. Of patients randomized to the titration group, 61% (102/168) did not request additional analgesia beyond the 1 mg initial dose. In the titration group, 42% (71/168) patients met the satisfactory end point for analgesia at 60 minutes following the initial 1 mg dose. From both groups, 112 patients reported mild-to-no-pain at 60 minutes from each group, accounting for roughly two-thirds of the overall patients enrolled. Given that the primary end-point studied was reported by patient pain scale, the authors do report some bias; however, according to their research, one-third of patients still requiring additional analgesia is in line with patient tolerance and opiate requirement from other studies.

It should come as no surprise that many patients felt relief with 1 mg of hydromorphone. Although the authors showed no adverse effects from 2 mg of hydromorphone, It should make us all think to start low with our opiates and add slowly, keeping in mind that patients have different tolerances to opiates. JEMS

David Page, MS, NREMT-P, is an educator at Inver Hills Community College and a paramedic at Allina EMS in Minneapolis/St. Paul. He’s a member of the Board of Advisors of the Prehospital Care Research Forum and the JEMS Editorial Board. Send him feedback at dpage@ehs.net.

Alexander L. Trembley, NREMT-P, is a paramedic for North Memorial Ambulance based in Brooklyn Center, Minn., Lakeview Hospital EMS in Stillwater, Minn., and Mercy Ambulance in Moose Lake, Minn. Contact him at alex.trembley@gmail.com.

 
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Related Topics: Patient Care, Cardiac and Circulation, STEMI, beta-blockers, mycoradial infarction, Jems Research Review

 
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David Page, MS, NREMT-PDavid Page, MS, NREMT-P, is an EMS instructor at Inver Hills Community College and field paramedic with Allina EMS in the Minneapolis/St. Paul area. He’s also on the board of advisors for the UCLA Prehospital Care Research Forum. You can bike with him during the next EMS Memorial Bike Ride.

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