Mortality risk stratification in chronic kidney disease: one size for all ages?

Current National Kidney Foundation Kidney Disease Outcomes Quality Initiative staging criteria for chronic kidney disease (CKD) are intended to apply to all age groups. However, it is unclear whether different levels of estimated GFR (eGFR) have the same prognostic significance in older and younger patients. The study cohort was composed of Department of Veterans Affairs (VA) patients who were aged 18 to 100 yr and had at least one outpatient serum creatinine measurement between October 1, 2001, and September 30, 2002 (n=2583,911). Patients with ESRD were excluded. GFR was estimated using the Modification of Diet in Renal Disease equation using each patient's first outpatient creatinine measurement during the study period. The association of eGFR with survival was measured by age group. Twenty percent of cohort patients had an eGFR<60 ml/min per 1.73 m2, ranging from 3% among 18- to 44-yr-olds to as high as 49% among 85- to 100-yr-olds. Fifty-two percent (n=266,421) of cohort patients with an eGFR<60 ml/min per 1.73 m2 had "very" moderate reductions in eGFR into the 50- to 59-ml/min per 1.73 m2 range. The association of eGFR with mortality was weaker in the elderly than in younger age groups: Whereas severe reductions in eGFR were associated with an increased risk for death in all age groups, "very" moderate reductions in eGFR (50 to 59 ml/min per 1.73 m2) were associated with an increased adjusted risk for death only among patients who were younger than 65 yr. Age-related attenuation of the association of eGFR with mortality was also present among women and black patients. In the clinical setting, mortality risk stratification in elderly patients should not be based on the same eGFR cut points as for younger age groups and would benefit from finer categorization of the 30- to 59-ml/min per 1.73 m2 eGFR group.     

Laparoscopically assisted subtotal colectomy for idiopathic pneumatosis cystoides intestinalis

Pneumatosis cystoides intestinalis (PCI) is a rare entity in which gas filled cysts are found within the intestinal wall. Conservative management and the treatment of underlying illnesses are recommended in most patients and surgery is usually indicated when acute and life-threatening complications such as bowel necrosis, perforation or peritonitis appear. The authors report a case of idiopathic pneumatosis cystoides intestinalis which, after repeated failure of conservative treatment including the oxygen therapy in hyperbaric chamber, was successfully treated by laparoscopic subtotal colectomy. A laparoscopically assisted approach proved to be a good indication in subtotal colectomy in cases of PCI that are non-responsive to standard conservative treatment.     

Intraoperative manometry of the lower esophageal sphincter pressure during laparoscopic antireflux surgery with a mechanical calibration--early results

BACKGROUND/AIMS: Persistent postoperative dysphagia diminishes the good effect of laparoscopic anti-reflux surgery. An excessive increase of the intraoperative lower esophageal sphincter pressure (LESp) is supposed to be related to the persistent postoperative dysphagia and its knowledge could lead to the modification of the surgical technique followed by improved clinical outcomes. This study aims to describe the relation between the intraoperative LESp increase and the incidence of postoperative dysphagia and to find whether a combination of intraoperative manometry and mechanical calibration of the wrap is able to decrease the incidence of the persistent postoperative dysphagia. METHODOLOGY: The randomized, prospective, two-branch study included 39 patients suffering from symptoms of gastroesophageal reflux disease. All patients underwent pre- and postoperative manometry, 24-hour pH-metry and laparoscopic anti-reflux surgery. The intraoperative LESp was measured in the study arm only. RESULTS: A higher incidence of persistent postoperative dysphagia was revealed in patients with the intraoperative LESp increase more than 15 mmHg. This complication was not found in patients with the LESp increase under 8 mmHg with no impact on the efficacy of the surgery. The combination of the intraoperative manometry and the mechanical calibration of the wrap seems to bring the benefit only to a small number of the patients. CONCLUSIONS: According to our results, the intraoperative LESp measurement proved to be a useful supplementary method which was easy to perform, and which enables a modification of the surgical technique to decrease the incidence of the persistent postoperative dysphagia.     

A novel technique to quantify the instantaneous mitral regurgitant rate

Background

The systolic variation of mitral regurgitation (MR) is a pitfall in its quantification. Current recommendations advocate using quantitative echocardiographic techniques that account for this systolic variation. While prior studies have qualitatively described patterns of systolic variation no study has quantified this variation.

Methods

This study includes 41 patients who underwent cardiovascular magnetic resonance (CMR) evaluation for the assessment of MR. Systole was divided into 3 equal parts: early, mid, and late. The MR jets were categorized as holosystolc, early, or late based on the portions of systole the jet was visible. The aortic flow and left ventricular stroke volume (LVSV) acquired by CMR were plotted against time. The instantaneous regurgitant rate was calculated for each third of systole as the difference between the LVSV and the aortic flow.

Results

The regurgitant rate varied widely with a 1.9-fold, 3.4-fold, and 1.6-fold difference between the lowest and highest rate in patients with early, late, and holosystolic jets respectively. There was overlap of peak regurgitant rates among patients with mild, moderate and severe MR. The greatest variation of regurgitant rate was seen among patients with mild MR.

Conclusion

CMR can quantify the systolic temporal variation of MR. There is significant variation of the mitral regurgitant rate even among patients with holosystolic MR jets. These findings highlight the need to use quantitative measures of MR severity that take into consideration the temporal variation of MR.