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Does subclinical hypothyroidism affect cardiac pump performance?

Evidence from a magnetic resonance imaging study

Andrea Ripoli, PhD^*, Alessandro Pingitore, MD, PhD^*,*, Brunella Favilli, MSc^*, Antonio Bottoni, MD^*, Stefano Turchi, BSc^*, Nael F. Osman, PhD, Daniele De Marchi, RT^*, Massimo Lombardi, MD^*, Antonio L'Abbate, MD and Giorgio Iervasi, MD^*

^* Institute of Clinical Physiology, C.N.R., Pisa, Italy
Johns Hopkins University, Baltimore, Maryland
Scuola Superiore S. Anna and Institute of Clinical Physiology, C.N.R., Pisa, Italy

View larger version (32K): [in a new window]   Figure 1 Scatterplots showing the relationship between thyroid-stimulating hormone (TSH) and end-diastolic volume (EDV), stroke volume (SV), cardiac index (CI), systemic vascular resistance (SVR), and apical greatest systolic lengthening (E1) and apical greatest systolic shortening (E2). Open circles = subclinical hypothyroidism (SHT) patients before thyroid replacement therapy; filled circles = SHT patients after thyroid replacement therapy; open triangles = control group.

View larger version (20K): [in a new window]   Figure 2 Histograms showing the values of the tagging parameters in the control group and subclinical hypothyroidism (SHT) group before treatment. Alfa = angular deviation of greatest systolic lengthening (E1); E2 = greatest systolic shortening.

View larger version (21K): [in a new window]   Figure 3 Histograms showing the values of the tagging parameters in the subclinical hypothyroidism (SHT) patients before and after treatment. Alfa = angular deviation of greatest systolic lengthening (E1); E2 = greatest systolic shortening.