What question did this study set out to answer?

To determine whether concurrent digoxin administration exacerbates the severity and progression of doxorubicin-induced cardiomyopathy in an animal model.

April 15, 1990International Journal of Cancer

Exacerbation of doxorubicin cardiotoxicity by digoxin administration in an experimental rabbit model

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Why the study?

Does digoxin administration exacerbate doxorubicin cardiotoxicity in an experimental rabbit model?

Population

24 rabbits in a chronic experimental model

Comparison

Digoxin pretreatment and continued… vs Doxorubicin alone and untreated controls

Design

Preclinical

Authors

WRWilliam C. ReevesEast Carolina University JGJames W. GriffithConcordia University Wisconsin MWMary A. WoodOregon Health & Science University

Discussion

Member takes

Implication

May exacerbate doxorubicin cardiotoxicity in rabbits; hypothesis-generating and should not change clinical practice.

Key Points

To determine whether concurrent digoxin administration exacerbates the severity and progression of doxorubicin-induced cardiomyopathy in an animal model.
Studied 24 rabbits across three arms: untreated control (n=6), doxorubicin alone (n=6), and combined digoxin-doxorubicin treatment (n=12).
Evaluated myocardial pathology via light microscopic histology, quantified fibrosis through hydroxyproline assays, and assessed cellular damage via technetium-99m pyrophosphate uptake.
Mortality reached 50% (6/12) in the digoxin-doxorubicin group, whereas all rabbits in the control (6/6) and doxorubicin-alone (6/6) groups survived the entire study.
The most severe histologic myocardial lesions occurred exclusively in the digoxin-doxorubicin group.
Myocardial hydroxyproline content was significantly higher in the digoxin-doxorubicin arm than in doxorubicin or control arms (p < 0.05), alongside significantly elevated technetium-99m pyrophosphate uptake versus controls (p < 0.05).

Structured PICO

Does digoxin administration exacerbate doxorubicin cardiotoxicity in an experimental rabbit model?

Population

24 rabbits in a chronic experimental model

Intervention

Digoxin pretreatment and continued administration together with doxorubicin

Comparator

Doxorubicin alone and untreated controls

Outcome

Myocardial pathology (graded by light microscopy), myocardial fibrosis (hydroxyproline determinations), myocardial cellular damage (technetium-99m pyrophosphate uptake), and mortalitysurrogate

Digoxin administration exacerbates doxorubicin-induced myocardial damage and increases mortality in an experimental rabbit model.

Cite This Study

Reeves et al. (1990) studied this question.

synapsesocial.com/papers/6a7b0cacf48aafa9d7f39878 https://doi.org/10.1002/ijc.2910450427

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Exacerbation of doxorubicin cardiotoxicity by digoxin administration in an experimental rabbit model

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Exacerbation of doxorubicin cardiotoxicity by digoxin administration in an experimental rabbit model

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

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