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Prognostic Value of Bone Formation and Resorption Proteins in Heterotopic Ossification in Critically-Ill Patients. A Single-Centre Study

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29 ene 2021

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Fig. 1

Study enrolment flow chart
Study enrolment flow chart

Fig. 2

BMP-2, RANKL and Osteoprotegerin levels on admission. a) BMP-2, b) RANKL, c) Osteoprotegerin and d) RANKL: Osteoprotegerin ratio were measured in 28 critically ill, initially non-septic patients on ICU admission. Patients were subsequently categorised as heterotopic ossification-positive (those who subsequently developed heterotopic ossification, yes, N= 9) and heterotopic ossification -negative (those who did not develop heterotopic ossification, no, N= 19). Two-group comparisons were performed with the non-parametric Mann-Whitney test, * p< 0.05. Data are presented as box plots. Line in the box, median value; box edges, 25th to 75th centiles; whiskers, range of values; bullet points, outliers. BMP-2= bone-morphogenetic protein 2, RANKL= receptor activator of nuclear factor kappa-Β ligand, OPG= osteoprotegerin.
BMP-2, RANKL and Osteoprotegerin levels on admission. a) BMP-2, b) RANKL, c) Osteoprotegerin and d) RANKL: Osteoprotegerin ratio were measured in 28 critically ill, initially non-septic patients on ICU admission. Patients were subsequently categorised as heterotopic ossification-positive (those who subsequently developed heterotopic ossification, yes, N= 9) and heterotopic ossification -negative (those who did not develop heterotopic ossification, no, N= 19). Two-group comparisons were performed with the non-parametric Mann-Whitney test, * p< 0.05. Data are presented as box plots. Line in the box, median value; box edges, 25th to 75th centiles; whiskers, range of values; bullet points, outliers. BMP-2= bone-morphogenetic protein 2, RANKL= receptor activator of nuclear factor kappa-Β ligand, OPG= osteoprotegerin.

Fig.3

Time course of BMP-2, RANKL and OPG levels during ICU stay and the follow-up period in the patients who developed heterotopic ossification. a) BMP-2, b) RANKL, c) OPG and d) RANKL: OPG ratio were measured in 9 patients who developed heterotopic ossification on ICU admission (0), and thereafter seven days post-admission (7) and 30 days following ICU discharge (30). Data are presented with box plots. Line in the box, median value; box edges, 25th to 75th centiles; whiskers, range of values. Comparisons were performed using one-way ANOVA followed by Dunn’s multiple comparisons. BMP-2= bone-morphogenetic protein 2, RANKL= receptor activator of nuclear factor kappa-Β ligand, OPG= osteoprotegerin.
Time course of BMP-2, RANKL and OPG levels during ICU stay and the follow-up period in the patients who developed heterotopic ossification. a) BMP-2, b) RANKL, c) OPG and d) RANKL: OPG ratio were measured in 9 patients who developed heterotopic ossification on ICU admission (0), and thereafter seven days post-admission (7) and 30 days following ICU discharge (30). Data are presented with box plots. Line in the box, median value; box edges, 25th to 75th centiles; whiskers, range of values. Comparisons were performed using one-way ANOVA followed by Dunn’s multiple comparisons. BMP-2= bone-morphogenetic protein 2, RANKL= receptor activator of nuclear factor kappa-Β ligand, OPG= osteoprotegerin.

Fig. 4

Time course of BMP-2, RANKL and OPG levels during ICU stay and the follow-up period in the patients who did not develop heterotopic ossification. a) BMP-2, b) RANKL, c) OPG and d) RANKL: OPG ratio were measured in 19 patients who did not develop heterotopic ossification on ICU admission (0), and thereafter seven days post-admission (7) and 30 days following ICU discharge (30). Data are presented with box plots. Line in the box, median value; box edges, 25th to 75th centiles; whiskers, range of values; bullet points, outliers. Comparisons were performed using one-way ANOVA followed by Dunn’s multiple comparisons. BMP-2= bone-morphogenetic protein 2, RANKL= receptor activator of nuclear factor kappa-Β ligand, OPG= osteoprotegerin.
Time course of BMP-2, RANKL and OPG levels during ICU stay and the follow-up period in the patients who did not develop heterotopic ossification. a) BMP-2, b) RANKL, c) OPG and d) RANKL: OPG ratio were measured in 19 patients who did not develop heterotopic ossification on ICU admission (0), and thereafter seven days post-admission (7) and 30 days following ICU discharge (30). Data are presented with box plots. Line in the box, median value; box edges, 25th to 75th centiles; whiskers, range of values; bullet points, outliers. Comparisons were performed using one-way ANOVA followed by Dunn’s multiple comparisons. BMP-2= bone-morphogenetic protein 2, RANKL= receptor activator of nuclear factor kappa-Β ligand, OPG= osteoprotegerin.

Fig. 5

Receiver operating characteristic (ROC) curve analysis. ROC curves were generated to determine the prognostic accuracy of a) BMP-2 and b) RANKL; the corresponding areas under the curve (AUC) and 95% confidence intervals (CI) were estimated as follows: BMP-2 at 0.823 (0.623-1.023, p= 0.038); RANKL at 0.767 (0.557-0.977, p= 0.048). The levels of both molecules were estimated on ICU admission. BMP-2= bone-morphogenetic protein 2, RANKL= receptor activator of nuclear factor kappa-Β ligand.
Receiver operating characteristic (ROC) curve analysis. ROC curves were generated to determine the prognostic accuracy of a) BMP-2 and b) RANKL; the corresponding areas under the curve (AUC) and 95% confidence intervals (CI) were estimated as follows: BMP-2 at 0.823 (0.623-1.023, p= 0.038); RANKL at 0.767 (0.557-0.977, p= 0.048). The levels of both molecules were estimated on ICU admission. BMP-2= bone-morphogenetic protein 2, RANKL= receptor activator of nuclear factor kappa-Β ligand.

Demographics on ICU admission and important outcomes of the patients who developed heterotopic ossification (HO) (HO-positive) versus those who did not (HO-negative)_

Demographics/Outcomes HO-positive patients HO-negative patients p-value
Number of patients (N) 9 19
Age 51(19) 51(14) ns
Sex ns
         Male 14
         Female 5
APACHE II, mean (SD) 16(6) 17(5) ns
SOFA, mean (SD) 7(1) 7(2) ns
CRP (mg/dl), (median, IQR) 5.1 (1.6-12.0) 5.5 (1.1-8.8) ns
PCT (ng/ml), (median, IQR) 1.1 (0.2-2.5) 0.1 (0.1-0.8) ns
Creatinine (mg/dl), mean (SD) 0.7(0.2) 0.9(0.3) ns
Vitamin D (ng/ml), (median, IQR) 6.8 (4.2-13.6) 12.7 (6.5-16.8) ns
Diagnosis ns
         Medical 0% 15.8%
         Surgery/Trauma 100% 84.2%
Medical 0 3
         Cerebral abscess - 1
         Subarachnoid haemorrhage - 1
         Cerebral haemorrhage - 1
Surgical Emergency 5 8
         Thoracic 0 0
         Neurosurgery 5 8
         Abdominal 0 0
Trauma 4 8
Comorbidities 3 7 ns
         CAD
         Arterial Hypertension
         Hypothyroidism
Mechanical ventilation (days) 20 (17-25) 22 (16-30) ns
ICU Length of Stay (days) 29 (21-35) 30 (22-40) ns
Sepsis 66.7% 84.2% ns
Day of sepsis 10 (7-12) 8 (5-10) ns