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Spiked helmet sign: An under-recognized electrocardiogram finding in critically ill patients.
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MedLine Citation:
PMID:  24872654     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
A 77-year-old male patient presented with rhabdomyolysis. He developed progressive respiratory failure and acute respiratory distress syndrome during his hospital stay requiring mechanical ventilation. An electrocardiogram during mechanical ventilation showed findings suggestive of ST elevation myocardial infarction. Closer review showed dome and spike findings that have been likened to a "spiked helmet." This finding has been associated with significant mortality. We discuss this under-recognized finding and the potential contributing mechanisms.
Authors:
Ajay Agarwal; Timothy G Janz; Naga V Garikipati
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Indian journal of critical care medicine : peer-reviewed, official publication of Indian Society of Critical Care Medicine     Volume:  18     ISSN:  0972-5229     ISO Abbreviation:  Indian J Crit Care Med     Publication Date:  2014 Apr 
Date Detail:
Created Date:  2014-05-29     Completed Date:  2014-05-29     Revised Date:  2014-06-02    
Medline Journal Info:
Nlm Unique ID:  101208863     Medline TA:  Indian J Crit Care Med     Country:  India    
Other Details:
Languages:  eng     Pagination:  238-40     Citation Subset:  -    
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Full Text
Journal Information
Journal ID (nlm-ta): Indian J Crit Care Med
Journal ID (iso-abbrev): Indian J Crit Care Med
Journal ID (publisher-id): IJCCM
ISSN: 0972-5229
ISSN: 1998-359X
Publisher: Medknow Publications & Media Pvt Ltd, India
Article Information
Copyright: © Indian Journal of Critical Care Medicine
open-access:
Print publication date: Month: 4 Year: 2014
Volume: 18 Issue: 4
First Page: 238 Last Page: 240
PubMed Id: 24872654
ID: 4033858
Publisher Id: IJCCM-18-238
DOI: 10.4103/0972-5229.130576

Spiked helmet sign: An under-recognized electrocardiogram finding in critically ill patients
Ajay Agarwal12
Timothy G. Janz12
Naga V. Garikipati2
From: Department of Medicine, Dayton Veteran Affairs Medical Center, Dayton, OH 45428, USA
1Wright State University, Dayton, OH 45409, USA
Correspondence: Correspondence: Dr. Ajay Agarwal, Department of Medicine, Dayton Veteran Affairs Medical Center, 4100 W 3rd Street, Dayton, OH 45428, USA. E-mail: Ajay.agarwal@va.gov

Introduction

Electrocardiogram (ECG) is an important diagnostic tool for the prompt recognition of myocardial infarction (MI). There is a high incidence of clinically unrecognized myocardial damage among the critically ill. Identification of ST elevation MI by ECG in the critically ill patient population is limited by the lack of specificity due to a variety of non-ischemic processes.[1] The significance of these non-ischemic findings is not well-understood.


Case Report

This is a case report of a 77-year-old male patient who presented with generalized weakness, confusion, somnolence, recurrent falls and tea-colored urine for 3-4 days. His past medical history was significant for hypertension, chronic obstructive pulmonary disease and coronary artery disease with a remote history of MI. Physical examination revealed a confused and lethargic elderly male. His vitals showed blood pressure 97/42, heart rate of 51, respiratory rate of 12 and oxygen saturation of 93% on room air. There were extensive ecchymoses in different stages of healing on all 4 extremities and on the torso. Laboratory data were consistent with rhabdomyolysis and acute renal failure. ECG upon presentation revealed sinus rhythm with no abnormalities [Figure 1].

The patient was rehydrated with intravenous normal saline and nephrotoxic medications were withheld. His renal function improved and on the 2nd day, his chest X-ray revealed patchy bilateral infiltrates. On the 3rd day, he developed respiratory distress with an increase in oxygen requirements. The chest computed tomography revealed bilateral ground glass opacities with consolidation consistent with acute lung injury/acute respiratory distress syndrome. After failing a trial of non-invasive positive pressure ventilation, he was intubated and mechanically ventilated for hypoxic respiratory failure. He developed intermittent supraventricular tachycardia, atrial flutter and atrial fibrillation were treated with intravenous esmolol and diltiazem after which he converted to sinus rhythm. On the 4th hospital day, he developed increasing oxygen requirements and asynchronous volume control ventilation; his ventilator settings were switched to pressure control ventilation. An echocardiogram revealed left ventricular ejection fraction of 45-50% with grade II diastolic dysfunction and no wall motion abnormalities. Patient developed fever and broad-spectrum antibiotics were initiated. He later became progressively hypoxic and tachypneic on the ventilator during the next couple of days. He was paralyzed using vecuronium. His clinical status worsened and his ventilator settings were changed; the positive end-expiratory pressure (PEEP) was increased to 13 mm Hg. ECG at the time showed ST segment and T wave changes concerning for ST elevation MI. Careful review of the ECG revealed bizarre, broad-based apparent ST-segment elevation in the precordial leads where the upward shift of the baseline started slightly before the onset of the QRS complexes. A more obvious dome and spike pattern was seen in the inferior leads [Figure 2]. These findings are not consistent with true ST-elevation MI. His central venous pressure decreased from 12 to 7 mm Hg and tidal volumes were increased from 550 to 750 cc during this period. An urgent bedside echocardiogram showed preserved left ventricular ejection fraction with no wall motion abnormalities. The ventilator settings were changed and the PEEP was discontinued. Following this change, the ECG no longer showed the findings noted above [Figure 3]. The patient passed away on the 11th day of hospitalization from acute respiratory distress syndrome.


Discussion

Our case represents an uncommon finding of dome and spike ST-T wave changes mimicking ST elevation MI in the setting of a critical non-cardiac illness. These findings were similar to those reported by Littmann and Monroe[2] and Tomcsányi et al.[3] The ST-T wave changes in these cases were likened to a spiked German military helmet [inset Figure 2] the “Pickelhaube,” introduced in 1842 by Friedrich Wilhelm IV, the King of Prussia. The mechanism of this phenomenon is unknown and several postulated mechanisms for this finding include (1) artifact[4, 5] (2) a sudden increase in the intra-abdominal or intra-thoracic pressure[2, 3] (3) direct stimulation of inferior wall of left ventricle by the diaphragm,[6] (4) stimulation of the diaphragm by the left phrenic nerve, (5) synchronized contraction of diaphragm along with the cardiac cycle in the setting of alkalosis with latent tetany,[7] (6) acute stretch of skin overlying the chest wall with each cardiac cycle[8] and (7) diaphragmatic breathing that alters ECG patterns.[9] The acute rise in intrathoracic pressure with an increase in PEEP most likely contributed to the dome and spike pattern in our patient.

This abnormal ECG finding with a dome and spike “helmet sign” pattern in a critically ill patient is a marker for very high mortality. It is an under-recognized phenomenon and further research is needed as early recognition can possibly assist clinical management.


Notes

Source of Support: Nil

Conflict of Interest: None declared.

References
1. Rennyson SL,Hunt J,Haley MW,Norton HJ,Littmann L. Electrocardiographic ST-segment elevation myocardial infarction in critically ill patients: An observational cohort analysisCrit Care MedYear: 2010382304920890196
2. Littmann L,Monroe MH. The “spiked helmet” sign: A new electrocardiographic marker of critical illness and high risk of deathMayo Clin ProcYear: 2011861245622134944
3. Tomcsányi J,Frész T,Bózsik B. ST elevation anterior “spiked helmet” signMayo Clin ProcYear: 20128730922386187
4. Chase C,Brady WJ. Artifactual electrocardiographic change mimicking clinical abnormality on the ECGAm J Emerg MedYear: 200018312610830688
5. Hall BW,Knight BP. An abnormal electrocardiogram in a young man: What is the etiology?Pacing Clin ElectrophysiolYear: 2002251510212418749
6. Frye RL,Braunwald E. Bilateral diaphragmatic contraction synchronous with cardiac systoleN Engl J MedYear: 1960263775813702335
7. Sjoerdsma A,Gaynor WB. Contraction of left leaf of diaphragm coincident with cardiac systoleJ Am Med AssocYear: 1954154987913129078
8. Brearley WD Jr,Taylor L 3rd,Haley MW,Littmann L. Pneumomediastinum mimicking acute ST-segment elevation myocardial infarctionInt J CardiolYear: 2007117e73517320223
9. Tennant FS Jr,Weiss MM,Leight L. Electrocardiographic changes following diaphragmatic inspirationAngiologyYear: 1968194995054175698

Figures

[Figure ID: F1]
Figure 1 

Baseline electrocardiogram during admission to the hospital



[Figure ID: F2]
Figure 2 

Dome and spike pattern “helmet sign” ST-T segment changes of precordial leads after increase in positive end-expiratory pressure to 13 mm Hg. German military helmet with dome and spike (inset) reproduced with permission from Mayo Clinic Proceedings



[Figure ID: F3]
Figure 3 

Resolution of ST-T segment changes in precordial leads after the discontinuation of positive end-expiratory pressure



Article Categories:
  • Case Report

Keywords: Critical illness, electrocardiogram, mortality, myocardial infarction.

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