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Letter to the Editor
Takotsubo cardiomyopathy and chronic obstructive pulmonary disease – Reply
Miocardiopatia Takotsubo e doença pulmonar obstrutiva crónica – Resposta
Filipa Melãoa, José Pedro L. Nunesb,
Corresponding author
jplnunes@med.up.pt

Corresponding author.
a Department of Cardiology, Hospital São João, Porto, Portugal
b Faculdade de Medicina da Universidade do Porto, Porto, Portugal
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">We read with interest the comments by Dr&#46; Dias and Dr&#46; Franco on our recently published case report &#8220;Stress-induced cardiomyopathy associated with ipratropium bromide in a patient with chronic obstructive pulmonary disease&#8221; &#40;COPD&#41;&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a> We agree with Dr&#46; Dias and Dr&#46; Franco that factors such as the presence of pneumonia may have contributed to the clinical picture&#46; The point of divergence is the most likely acute trigger for the stress cardiomyopathy&#46; As we state in the text&#44; we think that the time-course of the association between the administration of ipratropium bromide and Takotsubo cardiomyopathy is suggestive of a causal role&#44; and this view is strengthened by the second episode of bronchospasm&#46;<a class="elsevierStyleCrossRef" href="#bib0005"><span class="elsevierStyleSup">1</span></a></p><p id="par0010" class="elsevierStylePara elsevierViewall">Epidemiological studies are generally speaking unable to provide proof of causality &#40;only showing that an association exists&#41;&#46; Causality can only be established in the context of controlled studies&#44; such as a controlled clinical trial&#46;<a class="elsevierStyleCrossRef" href="#bib0010"><span class="elsevierStyleSup">2</span></a> However&#44; from a practical standpoint&#44; it is important to evaluate the possible causal role of a given drug in a possible adverse drug reaction scenario&#44; since the same patient&#44; as well as others&#44; may be treated in the future in the same type of context and with the same drug&#46; Several methods have been put forward for this purpose&#44; although most have shortcomings&#46;<a class="elsevierStyleCrossRef" href="#bib0015"><span class="elsevierStyleSup">3</span></a></p><p id="par0015" class="elsevierStylePara elsevierViewall">The time-course&#44; the temporal relation between drug administration and the suspected reaction&#44; is critical in evaluating an adverse drug reaction &#8211; and the time course&#44; in this particular case&#44; in our view suggests that ipratropium bromide had a causal role&#46; The parameters of temporal sequence&#44; pattern of response&#44; withdrawal and re-exposure<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a> may be seen as favoring our view&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">Previous reports of stress cardiomyopathy in COPD patients have described the use of ipratropium&#44; namely the case reported by Pham et al&#46;<a class="elsevierStyleCrossRef" href="#bib0025"><span class="elsevierStyleSup">5</span></a> and one of the cases by White and Stewart&#46;<a class="elsevierStyleCrossRef" href="#bib0030"><span class="elsevierStyleSup">6</span></a> However&#44; it can be argued that this falls short of establishing that there are previous conclusive reports of this reaction&#46;<a class="elsevierStyleCrossRef" href="#bib0020"><span class="elsevierStyleSup">4</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">Concerning drugs that act on adrenergic mechanisms&#44; Sharkey et al&#46; described a series of 136 patients with stress cardiomyopathy&#44; including 13 patients treated with adrenergic agonists that could have acted as triggers&#46;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> However&#44; 25 patients of the same series were taking beta-blockers&#44;<a class="elsevierStyleCrossRef" href="#bib0035"><span class="elsevierStyleSup">7</span></a> raising doubts concerning the role of adrenergic mechanisms in this setting&#46;</p><p id="par0030" class="elsevierStylePara elsevierViewall">In conclusion&#44; the association between ipratropium bromide use and stress cardiomyopathy in the case we reported was quite clear&#44; and we think that it is reasonable to suggest that ipratropium bromide had a causal role in this case&#46; Since ipratropium bromide use has been associated to stress cardiomyopathy in several individual COPD patients&#44; a more systematic evaluation of this association could be justified&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0035" class="elsevierStylePara elsevierViewall">The authors have no conflicts of interest to declare&#46;</p></span></span>"
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