Rhabdomyolysis: risk factors and incidence in polytrauma patients in the absence of major disasters

PURPOSE

Rhabdomyolysis is a syndrome caused by musculoskeletal tissue damage that leads to the release of large amounts of intracellular elements, which particularly affect renal function. The most common causes are severe trauma, ischemia, surgical procedures, and drug abuse. We aimed to determine the incidence of rhabdomyolysis by measuring muscle injury markers (CK, myoglobin), to identify pre/post-admission as well as iatrogenic risk factors for rhabdomyolysis in severe polytrauma, to clarify the relevance of orthopedic injuries and surgical treatment in the onset/worsening of rhabdomyolysis, and to correlate risk factors with its main complication-acute renal failure (ARF).

METHODS

Prospective study of severe polytrauma patients (Injury Severity Score (ISS) >15), with CK and myoglobin values measured at admission and after 24, 48, and 72 h. Peak values, variations between admission and peak, and variations between admission and day 3 were all determined. The correlations of those values with the onset of ARF and other negative outcomes were assessed.

RESULTS

A total of 57 consecutive patients with a median ISS of 29 were included. ARF was present in 20 patients (38 %). CK-0 level was correlated with male gender (p < 0.027) and ISS (0.014); Mb-0 level was correlated with hypovolemic shock (0.003) and skeletal fracture (p < 0.043). CK-max was correlated with surgery (p < 0.038) and surgery duration (p < 0.014); Mb-max was correlated with surgery (p < 0.002) and anesthesia duration (p < 0.005). Δ-CK was correlated with surgery (p < 0.01) and surgery duration (p < 0.017), and Δ0-3-CK was correlated with surgery (p < 0.042). Logistic regression analysis found relationships between Δ0-3-CK and both ICU admission (p < 0.003) and MODS (p < 0.012), and between Mb-max and ARF (p < 0.034).

CONCLUSION

We found that a large number of factors are implicated in CK and Mb variations. Rhabdomyolysis is a very frequent complication, but increase in CK marker alone does not seem to be correlated with the incidence of ARF. Therefore, Mb level should be considered in this group of patients.

Bigger families fare better: a novel method to estimate rater contrast effects in parental ratings on ADHD symptoms

Many twin studies on parental ratings of attention deficit hyperactivity disorder (ADHD) symptoms report low or negative DZ correlations. The observed differences in MZ and DZ variances indicate sibling contrast effects, which appear to reflect a bias in parent ratings. Knowledge of the factors that contribute to this rater contrast effect is, however, limited. Using parent-rated ADHD symptoms from the Twins' Early Development Study and a novel application of a twin model, we explored a range of socio-demographic variables (ethnicity, socio-economic status, and family size), as potential contributors to contrast effects and their interactive effect with gender composition of twin pairs. Gender did moderate contrast effects but only in DZ opposite-sex twin pairs. Family size also showed a moderating effect on rater contrast effects, which was further modified by gender. We further observed an effect of rating scale, with the DSM-IV ADHD subscale of the Revised Conners' Parent Rating Scale more resistant to contrast effects than shorter scales of ADHD symptoms. The improved identification of situations where the accuracy of the most common informant of childhood ADHD symptoms-parents-is compromised as a result of rater bias, might have implications for future research on ADHD.

Successful application of helmet non-invasive ventilation in a parturient with acute respiratory distress syndrome

Acute respiratory distress syndrome (ARDS) is an important cause of morbidity and mortality during pregnancy. The case of a twin pregnant woman in her 28th week who developed infection-related ARDS, undergoing a cesarean section for premature membrane rupture is described. It was performed epidural anaesthesia and helmet non-invasive ventilation (NIV) during the postoperative period. The combination of epidural anesthesia with NIV helped to restore physiological gas-exchange and to prevent common complications associated with a more invasive approach.

Surgical resection in Crohn's disease: is immunosuppressive medication associated with higher postoperative infection rates?

AIM

The aim of this study was to analyse postoperative infection in patients undergoing surgery for Crohn's disease (CD) according to the use of preoperative immunosuppressants, including infliximab.

METHOD

With IRB approval, the records of all patients with CD who underwent abdominal surgery between 2001 and 2008 were reviewed for comorbidity, preoperative medication, type of surgery, stoma construction and postoperative complications. Patients were divided into three categories according to the preoperative medication within 90 days of surgery as follows: infliximab (IFX), other drugs including steroids and/or immunosuppressive agents (OD) and no drugs (ND).

RESULTS

Two hundred and twenty-five patients were identified. Preoperative comorbidity, surgical indication and type of surgery were not significantly different among the three groups. Ileocolic resection was the most common procedure [50.8%, IFX group; 61.2%, OD group; 41.3%, ND group (P = 0.09)]. Other procedures included total colectomy (16%), protectomy (15%) and others (18%). Laparoscopic surgery was performed in 47.7%, 45.9% and 29.3% of patients in the IFX, OD and ND groups, respectively (P = 0.04). There were no differences in postoperative rates of infection [pneumonia (P = 0.14), wound infection (P = 0.35), abscess (P = 0.34) or anastomotic leakage (P = 0.44)]. Reoperation was needed in 3.0%, 8.2% and 2.6% of patients in the IFX, OD and ND groups, respectively. Multiple logistic regression found no relationship between infliximab use and infection.

CONCLUSION

There was no difference in the rate of postoperative complications among the groups of patients undergoing surgery for CD pretreated with IFX or other immunosuppressive drugs.

Surgical resection in Crohn's disease: is immunosuppressive medication associated with higher postoperative infection rates?

AIM

The aim of this study was to analyse postoperative infection in patients undergoing surgery for Crohn's disease (CD) according to the use of preoperative immunosuppressants, including infliximab.

METHOD

With IRB approval, the records of all patients with CD who underwent abdominal surgery between 2001 and 2008 were reviewed for comorbidity, preoperative medication, type of surgery, stoma construction and postoperative complications. Patients were divided into three categories according to the preoperative medication within 90 days of surgery as follows: infliximab (IFX), other drugs including steroids and/or immunosuppressive agents (OD) and no drugs (ND).

RESULTS

Two hundred and twenty-five patients were identified. Preoperative comorbidity, surgical indication and type of surgery were not significantly different among the three groups. Ileocolic resection was the most common procedure [50.8%, IFX group; 61.2%, OD group; 41.3%, ND group (P = 0.09)]. Other procedures included total colectomy (16%), protectomy (15%) and others (18%). Laparoscopic surgery was performed in 47.7%, 45.9% and 29.3% of patients in the IFX, OD and ND groups, respectively (P = 0.04). There were no differences in postoperative rates of infection [pneumonia (P = 0.14), wound infection (P = 0.35), abscess (P = 0.34) or anastomotic leakage (P = 0.44)]. Reoperation was needed in 3.0%, 8.2% and 2.6% of patients in the IFX, OD and ND groups, respectively. Multiple logistic regression found no relationship between infliximab use and infection.

CONCLUSION

There was no difference in the rate of postoperative complications among the groups of patients undergoing surgery for CD pretreated with IFX or other immunosuppressive drugs.

[Spontaneous regression of symptomatic lumbar disc herniation]

Lumbar disc herniation is very common, sometimes leading to disability of the patient, and in a significant number of cases can only be solved with surgery. This paper reports a case with a large symptomatic disc herniation, which suffered spontaneous regression, and no surgery was necessary. The case is documented on serial MRI, consistent with the clinical improvement of the patient.

Dosimetry of a set-up for the exposure of newborn mice to 2.45-GHZ WiFi frequencies

This work describes the dosimetry of a two waveguide cell system designed to expose newborn mice to electromagnetic fields associated with wireless fidelity signals in the frequency band of 2.45 GHz. The dosimetric characterisation of the exposure system was performed both numerically and experimentally. Specific measures were adopted with regard to the increase in both weight and size of the biological target during the exposure period. The specific absorption rate (SAR, W kg(-1)) for 1 W of input power vs. weight curve was assessed. The curve evidenced an SAR pattern varying from <1 W kg(-1) to >6 W kg(-1) during the first 5 weeks of the life of mice, with a peak resonance phenomenon at a weight around 5 g. This curve was used to set the appropriate level of input power during experimental sessions to expose the growing mice to a defined and constant dose.

Characterization of a rat model of moderate chronic renal failure--focus on hematological, biochemical, and cardio-renal profiles

The pathophysiological modifications underlying chronic renal failure seems to be dependent on the insufficiency degree, which will determine the moment to start therapy. As there is yet limited information about animal models of moderate chronic renal failure, we intended to perform a complete characterization of the hematological and cardio-renal alterations induced by partial nephrectomy. Blood samples from control and chronic renal failure rats were collected at 0, 3, 9, and 15 weeks in order to evaluate renal function, hematological parameters, iron metabolism, blood lipids, peripheral sympathetic nervous system, and inflammatory and redox status markers. BP, tissues trophy indexes, and kidney histomorphology were also assessed. Our data are consistent with a sustained moderate degree of chronic renal failure with a quickly compensated modest anaemia, though presenting iron metabolism disturbances. Despite the reasonable degree of functionality of the remnant kidney, as suggested by the anaemia correction and by the kidney hypertrophy and moderate lesions, several important cardiovascular modifications were developed. Our model presented hypertension, dyslipidemia, erythropoietic disturbances, sympathetic activation, and oxidative stress. This model might be a good tool to study the cellular/molecular mechanisms underlying moderate stages of chronic renal failure and to evaluate the therapeutic efficacy for prevention and treatment/correction of cardio-renal anaemia syndromes and complications in early stages.