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Critical Care

, 23:90 | Cite as

Weaning order of vasoactive drugs

  • Vilto MichelsJrEmail author
  • Daisson José Trevisol
Open Access
Letter

Abbreviations

AVP

Vasopressin

NE

Norepinephrine

In the interesting paper by Jeon et al. [1] the incidence of hypotension while tapering vasopressors in patients recovering from septic shock on concomitant norepinephrine (NE) and vasopressin (AVP) was evaluated. Differing from other studies [2], the authors concluded that the incidence of hypotension was not related to the discontinuation order of the vasopressors, but was related to NE discontinuation. The authors suggested that AVP should be tapered before NE rather than the reverse.

We would like to make some comments on the results.

First, randomization was performed with NE at 0.3 μg/kg/min; then, tapering started at a rate of 0.1 μg/kg/min per hour. In the NE group, the average time to the hypotension onset after initiation of NE tapering was 2.5 h, suggesting that hypotension occurred primarily with NE at low-dose ranges. During NE tapering, commonly, taper rates are slower when the lowest dose ranges are reached due to hypotension [3].

Second, regarding NE administration, total NE time was 57.8 (38.9–88) h and total NE duration before initial tapering was 19.2 h, a very short time for the high hospital mortality found in the study (58.97%). Additionally, total NE tapering time since randomization just before hypotension was 22 h. However, the length of time between the maximum NE dose of 0.70 (0.46–1.20) μg/kg/min and the randomization dose, which could provide further information on tapering and clinical status before randomization, were not mentioned. The number of NE tapering attempts and the volume required during gradual tapering were also not mentioned.

Third, the administration of other drugs may also have affected the outcome. Many patients received dobutamine and low-dose corticosteroid without following a specific protocol.

Fourth, regarding AVP use, AVP infusion was maintained at 0.03 U/min, below its maximum dose of 0.04 U/min in septic shock. AVP has an S-shaped dose-response curve. At intermediate doses, it may have a disproportionately high therapeutic effect variation [4]. Perhaps AVP should be kept at its maximum dose for NE tapering. Also, patients in the AVP group had more frequent pneumonia, greater need for mechanical ventilation, and lower PF ratios than in the NE group, which could have stimulated AVP secretion induced by hypoxemia. This finding also suggests that AVP should be maintained at the maximum dose. Hospital mortality was higher in the AVP group than in the NE group (57.5% versus 34.2%, respectively; P = 0.039), which suggests that AVP should be tapered after NE.

Notes

Acknowledgements

Not applicable.

Funding

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Availability of data and materials

Data sharing is not applicable to this article as no datasets were generated or analyzed during the current study.

Authors’ contributions

VMJ and DJT analyzed, discussed, and wrote the letter together. Both authors approved the final manuscript.

Ethics approval and consent to participate

Not applicable.

Consent for publication

Not applicable.

Competing interests

The authors declare that they have no competing interests.

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References

  1. 1.
    Jeon K, Song JU, Chung CR, Yang JH, Suh GY. Incidence of hypotension according to the discontinuation order of vasopressors in the management of septic shock: a prospective randomized trial (DOVSS). Crit Care. 2018;22:131–42.CrossRefGoogle Scholar
  2. 2.
    Musallam N, Altshuler D, Merchan C, Zakhary B, Aberle C, Papadopoulos J. Evaluating vasopressor discontinuation strategies in patients with septic shock on concomitant norepinephrine and vasopressin infusions. Ann Pharmacother. 2018;52(8):733–9.CrossRefGoogle Scholar
  3. 3.
    Arellano DL, Hanneman SK. Vasopressor weaning in patients with septic shock. Crit Care Nurs Clin North Am. 2014;26(3):413–25.CrossRefGoogle Scholar
  4. 4.
    Pang CCY, Tabrizchi R. The effects of noradrenaline, B-HT 920, methoxamine, angiotensin II and vasopressin on mean circulatory filling pressure in conscious rats. Br J Pharmac. 1986;89(2):389–94.CrossRefGoogle Scholar

Copyright information

© The Author(s). 2019

Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

Authors and Affiliations

  1. 1.Postgraduate Program in Health ScienceUniversity of Southern Santa Catarina (Unisul)TubarãoBrazil
  2. 2.Clinical Research Center of Nossa Senhora da Conceição HospitalTubarãoBrazil

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