Donor cardiac troponin-I: a biochemical surrogate of heart function
ABSTRACT Cardiac troponin-I (cTnI) levels in the potential heart transplant donor may be a marker of heart dysfunction and predictive of recipient outcome. We studied the prevalence of cTnI elevation, its association with heart function and usability and its relationship with the time duration from coning.
In a prospective study, cTnI measurement, Swan-Ganz catheterisation and transthoracic echocardiography were performed at initial assessment in 79 potential heart donors (mean age 43 +/- 13.1 years). All donors were then managed according to a strict algorithm to optimise cardiac function, some receiving hormonal therapy as part of a randomised trial. Donor heart suitability for transplantation was assessed after 7 h of management. The association of cTnI with initial functional indices was assessed and outcome compared for donors categorised according to cTnI level < or = 1 microg l(-1) or >1 microg l(-1).
Serum cTnI levels negatively correlated with initial cardiac index (CI) (p = 0.003), right (p < 0.001) and left ventricular ejection fraction (p = 0.001) and positively with LV Tei index (p = 0.003). Serum cTnI was >1 microg l(-1) in 29/79 donors. Higher CVP (10 +/- 5.1 vs 7.9 +/- 2.9; p = 0.026) and PAWP (12 +/- 5.4 vs 8.1 +/- 3.1; p = 0.002), lower cardiac index (2.7 +/- 1.1 vs 3.6 +/- 0.9; p = 0.001) and fractional shortening (p < 0.01) and worse wall motion score index (p < 0.01) were observed in the cTnI >1 microg l(-1) group. CTnI and functional markers correlated with the time duration from coning.
The donor cTnI level represents a biochemical surrogate of functional donor heart assessment. High cTnI is associated with worse donor heart function and may act as a prompt for detailed assessment and optimisation.
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ABSTRACT: MicroRNAs (miRNAs) are short, single-stranded and non-coding RNAs, freely circulating in human plasma and correlating with vary pathologies. In this study, we monitored early myocardial injury and recovery after heart transplantation by detecting levels of circulating muscle-specific miR-133a, miR-133b and miR-208a. 7 consecutive patients underwent heart transplantation in Fuwai hospital and 14 healthy controls were included in our study. Peripheral vein blood was drawn from patients on the day just after transplantation (day 0), the 1st, 2nd, 3rd, 7th and 14th day after transplantation respectively. Serum from peripheral blood was obtained for cardiac troponin I (cTnI) measurement. Plasma was centrifuged from peripheral blood for measuring miR-133a, miR-133b and miR-208a by quantitative reverse transcription polymerase chain reaction (qRT-PCR). The plasma concentration of miRNAs were calculated by absolute quantification method. The sensitivity and specificity of circulating miRNAs were revealed by receiver operating characteristic curve (ROC) analysis. Correlations between miRNAs and cTnI / perioperative parameters were analyzed. Similar to cTnI, miR-133a, miR-133b and miR-208a all showed dynamic changes from high to low levels early after operation. The Sensitivity and specificity of miRNAs were: miR-133a (85.7%,100%), miR-208a (100%,100%), and miR-133b (90%,100%). Correlations between miRNAs and cTnI were statistically significant (p < 0.05), especially for miR-133b (R2 = 0.813, p < 0.001). MiR-133b from Day 0-Day 2 (r > 0.98, p < 0.01), and cTnI from Day 1- Day 3 (r > 0.86, p < 0.05) had strong correlations with bypass time, particularly parallel bypass time. Obviously, miR-133b had a better correlation than cTnI. Circulating miR-133b correlated well with parameters of heart function such as central venous pressure (CVP), pulmonary capillary wedge pressure (PCWP), cardiac output (CO) and inotrope support, while cTnI only correlated with 3 of the 4 parameters mentioned above. MiR-133b also had strong correlations with ventilation time (r > 0.99, p < 0.001) and length of ICU stay (r > 0.92, p < 0.05), both of which reflected the recovery after operation. The correlation coefficients of miR-133b were also higher than that of cTnI. The dynamic change in circulating muscle-specific miRNAs, especially miR-133b can reflect early myocardial injury after heart transplantation. And miR-133b may have advantages over cTnI in forecasting graft dysfunction and recovery of patients after operation.Journal of Cardiothoracic Surgery 07/2013; 8(1):165. DOI:10.1186/1749-8090-8-165 · 3.05 Impact Factor
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ABSTRACT: To review all published clinical studies of thyroid hormone administration to brain-dead potential organ donors. A search of PubMed using multiple search terms retrieved 401 publications including 35 original reports describing administration of thyroid hormone to brain-dead potential organ donors. Detailed review of the 35 original reports led to identification of two additional publications not retrieved in the original search. The 37 original publications reported findings from 16 separate case series or retrospective audits and seven randomized controlled trials, four of which were placebo-controlled. Meta-analysis was restricted to the four placebo-controlled randomized controlled trials. Whereas all case series and retrospective audits reported a beneficial effect of thyroid hormone administration, all seven randomized controlled trials reported no benefit of thyroid hormone administration either alone or in combination with other hormonal therapies. In four placebo-controlled trials including 209 donors, administration of thyroid hormone (n=108) compared with placebo (n=101) had no significant effect on donor cardiac index (pooled mean difference, 0.15 L/min/m²; 95% confidence interval -0.18 to 0.48). The major limitation of the case series and retrospective audits was the lack of consideration of uncontrolled variables that confound interpretation of the results. A limitation of the randomized controlled trials was that the proportion of donors who were hemodynamically unstable or marginal in other ways was too small to exclude a benefit of thyroid hormone in this subgroup. The findings of this systematic review do not support a role for routine administration of thyroid hormone in the brain-dead potential organ donor. Existing recommendations regarding the use of thyroid hormone in marginal donors are based on low-level evidence.Critical care medicine 05/2012; 40(5):1635-44. DOI:10.1097/CCM.0b013e3182416ee7 · 6.15 Impact Factor
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ABSTRACT: Presents a method for the extraction of anatomic structures on ultrasound images using the discrete dynamic contour. The concept of the traditional “snake” is kept while overcoming many of their limitations by using fuzzy images as potential term and by adding constraints on the model. After the model description, results are presented using oesophageal endosonographic images containing tumoral areas