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Toxicological Reviews

, Volume 24, Issue 3, pp 195–204 | Cite as

Management of the Cardiovascular Complications of Tricyclic Antidepressant Poisoning

Role of Sodium Bicarbonate
  • Sally M. Bradberry
  • H. K. Ruben Thanacoody
  • Barbara E. Watt
  • Simon H. L. Thomas
  • J. Allister Vale
Review Article

Abstract

Experimental studies suggest that both alkalinisation and sodium loading are effective in reducing cardiotoxicity independently. Species and experimental differences may explain why sodium bicarbonate appears to work by sodium loading in some studies and by a pH change in others. In the only case series, the administration of intravenous sodium bicarbonate to achieve a systemic pH of 7.5–7.55 reduced QRS prolongation, reversed hypotension (although colloid was also given) and improved mental status in patients with moderate to severe tricyclic antidepressant poisoning. This clinical study supports the use of sodium bicarbonate in the management of the cardiovascular complications of tricyclic antidepressant poisoning. However, the clinical indications and dosing recommendations remain to be clarified.

Hypotension should be managed initially by administration of colloid or crystalloid solutions, guided by central venous pressure monitoring. Based on experimental and clinical studies, sodium bicarbonate should then be administered. If hypotension persists despite adequate filling pressure and sodium bicarbonate administration, inotropic support should be initiated. In a non-randomised controlled trial in rats, epinephrine resulted in a higher survival rate and was superior to norepinephrine both when the drugs were used alone or when epinephrine was used in combination with sodium bicarbonate. Sodium bicarbonate alone resulted in a modest increase in survival rate but this increased markedly when sodium bicarbonate was used with epinephrine or norepinephrine. Clinical studies suggest benefit from norepinephrine and dopamine; in an uncontrolled study the former appeared more effective. Glucagon has also been of benefit. Experimental studies suggest extracorporeal circulation membrane oxygenation is also of potential value.

The immediate treatment of arrhythmias involves correcting hypoxia, electrolyte abnormalities, hypotension and acidosis. Administration of sodium bicarbonate may resolve arrhythmias even in the absence of acidosis and, only if this therapy fails, should conventional antiarrhythmic drugs be used. The class 1b agent phenytoin may reverse conduction defects and may be used for resistant ventricular tachycardia. There is also limited evidence for benefit from magnesium infusion. However, class 1a and 1c antiarrhythmic drugs should be avoided since they worsen sodium channel blockade, further slow conduction velocity and depress contractility. Class II agents (β-blockers) may also precipitate hypotension and cardiac arrest.

Keywords

Ventricular Tachycardia Sodium Bicarbonate Amitriptyline Sodium Loading Hypertonic Saline Group 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgements

No sources of funding were used to assist in the preparation of this review. The authors have no conflicts of interest that are directly relevant to the content of this review.

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Copyright information

© Adis Data Information BV 2005

Authors and Affiliations

  • Sally M. Bradberry
    • 1
    • 2
  • H. K. Ruben Thanacoody
    • 3
    • 4
  • Barbara E. Watt
    • 1
  • Simon H. L. Thomas
    • 3
    • 4
  • J. Allister Vale
    • 1
    • 2
  1. 1.City HospitalNational Poisons Information Service (Birmingham Centre)BirminghamUK
  2. 2.West Midlands Poisons UnitCity HospitalBirminghamUK
  3. 3.Wolfson Unit of Clinical Pharmacology, School of Clinical and Laboratory SciencesUniversity of NewcastleNewcastle upon TyneUK
  4. 4.National Poisons Information Service (Newcastle Centre)Newcastle upon TyneUK

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