Article Notes
- Chloroquine/hydroxychloroquine
- Azithromycin
- Kaletra (Lopinavir/ritonavir)
- Colchicine
- Ivermectin
- Tocilizumab
- Thaildomide
- Remdesivir
Human Love of Bells and Whistles
"Increasing the technological complexity of treatment appears to increase the significance of an illness and the appeal of an intervention. Furthermore, if hospitalization is required, additional distinction may be conferred. For instance, good evidence demonstrates that oral rehydration during acute diarrheal illness is at least as good as intravenous therapy. For most patients, metered-dose inhalers are as effective as nebulized bronchodilators, but inhalers are generally regarded as lesser treatments. The gadgetry of gizmos somehow provides cachet, and electrified intravenous pumps and nebulizer machines seem more substantive."
– Leff & Finucane, 2008
Daniel Jolley
Wong briefly summarises COVID pharmaceutical therapies that are currently in trial, and importantly have received media attention.
Highlighting that off-label use of these drugs may be important causes of future toxicological presentations to emergency departments, especially for those widely used in the community for other indications (eg. Plaquenil, Kaletra, colchicine...).
Briefly discussed are:
Daniel Jolley
Why is this review important?
Although the importance of managing spinal anaesthesia-associated hypotension during caesarean section is well appreciated, there continues to be some debate over relative efficacy of interventions, whether vasopressors or fluid-loading.
Fitzgerald at al.'s review and network meta-analysis quantitatively compares a complete range of interventions across 109 studies.
What did they show?
Vasopressors were more effective at preventing intra-operative hypotension than fluid infusion techniques alone. Although there was no statistically significant difference in the incidence of hypotension among metaraminol, phenylephrine or noradrenaline/norepinephrine, metaraminol appeared the most effective (OR 0.04-0.26) and ephedrine the least (0.09-0.85). [vs Norepinephrine (OR 0.06-0.28), Phenylephrine (OR 0.11-0.29)]
Similarly, nausea and vomiting incidence was lower with vasopressors than other interventions. Phenylephrine more commonly caused bradycardia than other pressors, and ephedrine more commonly tachycardia. There was no significant difference in reactive hypertension.
The bottom-line...
The most effective way of preventing and managing maternal intraoperative hypotension is, as international guidelines already assert, alpha-agonist vasopressors. Using more complex protocols, such as phenylephrine or norepinephrine infusions, does not appear to offer benefit over metaraminol. Fluid infusions are at best a secondary intervention.
Daniel Jolley