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Five Toxic Tips and Traps




     A Talk by Chris Nickson
No $
Gunja N, Graudins A. Emergency Medicine Australasia (2011) 23, 16–22
Photo by Lifeinthefastlane.com
                                 1
QRS>100ms




Holstege CP, Eldridge DL, Rowden AK. ECG manifestations: the
poisoned patient. Emerg Med Clin North Am. 2006 Feb;24(1):159-77
R’ > 3 mm




R’/ > 0.7
QT>450ms




Holstege CP, Eldridge DL, Rowden AK. ECG manifestations: the
poisoned patient. Emerg Med Clin North Am. 2006 Feb;24(1):159-77
Chan A, Isbister GK, Kirkpatrick CM, Dufful SB. Drug-induced QT prolongation and torsades de
pointes: evaluation of a QT nomogram. QJM. 2007 Oct;100(10):609-15. Epub 2007 Sep 19.
GIVE INSULIN
     EARLY & HIGH
         DOSE!




Photo by Michael Tapp
                        2
Insulin 1 unit/kg bolus
          and
  50% glucose 50mL
Yes…
1 unit/kg
Then infusions
          of
Insulin 0.5 unit/kg/h
         and
50% glucose 50mL/h
Give it
Early
DON’T CRASH,
OPEN THE BICARB!




                   3
NaHCO3 1-2 mmol/kg
      then
 Hyperventilate to
   pH 7.5-7.55
It’s
Magic!
Before
After
… TO THE
RESCUE !?   4
20% Intralipid
 1.5 mL/kg bolus
    = 100 mL

+/- repeat q5min x2
20% Intralipid
0.5 mL/kg/min infusion
   = 400 mL/ 20 min

+/- then 400mL/ 10 min
NEVER
                    SURRENDER!




Photo by Zugaldia
                              5
Gunja N, Graudins A. Emergency Medicine Australasia (2011) 23, 16–22
Photo by Incurable_hippie




              THE END
http://lifeinthefastlane.com/education/toxicology/

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Cardiotoxic Overdoses - 5 Toxic Tips and Traps

Editor's Notes

  1. Elad R
  2. Photo by Lifeinthefastlane.com
  3. Interventricular conduction delay – QRS > 100 ms in lead IIRight axis deviation of the terminal QRS:Terminal R wave > 3 mm in aVRR/S ratio > 0.7 in aVRQRS > 100 ms is predictive of seizuresQRS > 160 ms is predictive of ventricular arrhythmias (e.g. VT)
  4. Chan A, Isbister GK, Kirkpatrick CM, Dufful SB. Drug-induced QT prolongation and torsades de pointes: evaluation of a QT nomogram. QJM. 2007 Oct;100(10):609-15. Epub 2007 Sep 19. Review. PubMed PMID: 17881416. BACKGROUND: Although QT prolongation is associated with increased risk of torsade de pointes (TdP), the precise relationship is not well defined.AIM: To evaluate the performance of a QT nomogram in assessing the risk of TdP from QT-RR combinations.DESIGN: Systematic review.METHODS: We systematically searched MEDLINE/EMBASE for cases of drug-induced TdP. Controls were patients taking non-cardiotoxic drugs in overdose. Inclusion criteria were definite TdP, normal ECG before or after the event, association with a drug/toxin and QT-RR measurements available. The upper bound of a QT-RR cloud diagram developed from human preclinical studies was converted into a QT nomogram [QT vs. heart rate (HR)]. QT-HR combinations for TdP cases and controls were plotted with the QT nomogram, and curves corresponding to a QTc = 440 ms and QTc = 500 ms for comparison (Bazett's correction).RESULTS: We identified 129 cases of TdP. TdP cases occurred at lower HR values with longer QT intervals, with most cases occurring at HR 30-90 bpm. Controls were more evenly distributed, with HR 40-160 bpm. The sensitivity and specificity of the QT nomogram were 96.9% (95%CI 93.9-99.9) and 98.7% (95%CI 96.8-100), respectively. For BazettQTc = 440 ms, sensitivity and specificity were 98.5% (95%CI 96.3-100) and 66.7% (95%CI 58.6-74.7), respectively, whereas for BazettQTc =500 ms they were 93.8% (95%CI 89.6-98.0) and 97.2% (95%CI 94.3-100), respectively.DISCUSSION: The QT nomogram is a clinically relevant risk assessment tool that accurately predicts arrhythmogenic risk for drug-induced QT prolongation. Further prospective evaluation of the nomogram is needed.
  5. Michael Tapp
  6. The US Army
  7. A second ECG of the same patient showing worsening TCA cardiotoxicity with marked QRS broadening producing a sine wave appearance reminiscent of hyperkalaemia.
  8. Third ECG of the same patient after serum alkalinisation with sodium bicarbonate, intubation and hyperventilation.The QRS duration has narrowed back to normal and the R’ wave in aVR has disappeared.
  9. zugaldia
  10. Incurable_hippie