RESEARCH ARTICLE

Hippokratia 2016, 20(4):274-278

Pyrpasopoulou A1,2, Pateinakis P1, Varouktsi A1, Georgianou E1, Zografou I1, Roilides E2,3, Karagiannis A1
12nd Propedeutic Department of Internal Medicine
2Infectious Diseases Unit
33rd Pediatric Department, Hippokration Hospital, Thessaloniki, Greece

Abstract

Background: The elderly represent a significant cohort of patients presenting at the emergency department, especially in the developed countries. They are characterized by impaired physical condition, comorbidities, and little immune system resources and make frequent use of the healthcare system and its facilities. This study aimed to describe the features and prognostic factors of sepsis in elderly patients (>60 years old) admitted to an internal medicine ward.
Material and Methods: Two hundred eighty eight consecutively patients aged >60 years who were admitted with sepsis during a two-year-period were retrospectively included in the study. Clinical and laboratory parameters at presentation were analyzed. Causes of sepsis and biochemical markers were compared between the healthcare facility-naïve and the healthcare facility-exposed groups. The effect of comorbidities and previous exposure to the healthcare system on clinical course and outcome of the patients was analyzed.
Results: Among the comorbidities that were recorded and included in the analysis, the presence of chronic and acute renal impairment and neurologic disabilities were associated with a worse outcome of sepsis in the elderly. In the same cohort, a previous contact with the healthcare system was found to affect the duration of hospital stay, but not the outcome per se. Sepsis-related markers, such as inflammatory markers were not found to be associated with clinical progression and outcome.
Conclusions: Timely diagnosis and accurate evaluation of the severity of sepsis is required to ensure a better outcome for the patients. Sensitive markers and accurate prognostic models are constantly pursued. The impact of living characteristics of the modern aging society is additionally addressed and their effect on sepsis outcome assessed. Hippokratia 2016, 20(4): 274-278

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Key words:  Elderly, sepsis, healthcare facility, outcome, prognostic factors

Corresponding author: Athina Pyrpasopoulou, MD PhD, Consultant in Internal Medicine, 2nd Propedeutic Dept of Internal Medicine, Hippokration Hospital, 49 Konstantinoupoleos str., 54642, Thessaloniki, Greece, tel: +302310892651, fax: +302310835955, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

 

Introduction

The elderly are characterized by decreased endurance and physiological function1,2 and are additionally burdened with a high prevalence of multiple chronic conditions such as diabetes mellitus, heart failure, cerebrovascular disease, chronic respiratory failure etc3. As a direct consequence of their impaired compensatory mechanisms, they are more vulnerable and frail.

Improving healthcare has contributed to increasing life expectancy. The elderly are frequent attendants of the public/private health insurance provisions4. This may not always prove to their best of interest; more self-reliance has, at least in some reports, been associated with less antibiotic use, avoidance of hospitalizations, and some avoidable mortality5.

Sepsis is a major cause of mortality in the elderly6. More frequently encountered infectious syndromes in this age group include pneumonia, urinary tract infections, and soft tissue and skin infections7. Prevalent cause of late mortality is secondary sepsis, possibly due to the exhaustion of the patients’ immune system resources8.

Early recognition is crucial for increased survival and reduced hospital stay9. For this purpose, several biomarkers have been assessed as screening and prognostic tools10,11. These, however, may not be applicable in elderly patients12.

The aim of this retrospective study was to record the presence of comorbidities in elderly patients admitted with sepsis, and investigate the clinical course and outcome, in association with clinical and laboratory markers.

Material and Methods

Patients aged >60 years, consecutively admitted to an internal medicine ward of a tertiary hospital in Northern Greece with sepsis of all-cause (between July 2013-July 2015) were retrospectively included in the study. Sepsis was defined by fulfillment of the revised sepsis criteria13.

Age, sex, nursing home residence, referral from a hospice/chronic care facility, healthcare facility exposure for a period longer than 48 hours within the preceding six months, and comorbidities were recorded. Cause of sepsis was categorized as pneumonia (lower respiratory tract infection, defined as such by the presence of infiltrates in lung imaging or respiratory failure of abrupt onset not attributable to other causes), urinary tract infection (defined as such by a positive urinary culture or the presence of microorganisms and leucocytes in urine analysis), and other sources of sepsis (skin/soft tissue infections, abdominal infections, bacteremia). Duration of symptoms before presentation and prescription of antibiotics on an outpatient basis were also recorded.

Vital signs and laboratory parameters were recorded and included in the analysis. In a sub-analysis, demographics and laboratory parameters were compared among the group of patients who were admitted from home and did not mention any contact with a healthcare facility for longer than 48 hours within the preceding six months (Group I), and the group that were either admitted from another healthcare facility/nursing home or mentioned contact with a healthcare facility for longer than 48 hours within the preceding six months (Group II).

Outcome (death or survival) and length of stay were analyzed in association with the presence of comorbidities, previous healthcare system exposure, and different clinical and laboratory parameters.

Statistical analysis was performed with the Statistical Package for Social Sciences (SPSS) statistical software, version 13.0 (SPSS Inc., Chicago, IL, USA). Correlations between variables were tested with the x2-test, the independent samples – t-test and Pearson’s and Spearman’s correlation, depending on continuity or normality of values of tested variables. A p value <0.05 was considered statistically significant. The study was approved by the Institution’s Review Board (Clinical Studies’ Review and Ethical Committee Board, Hippokration Hospital, 19/10/2016).

Results

Two hundred eighty-eight patients were included in total (42.7 % male). The median age of the patients was 82 years (range: 60-97 years). The frequencies of comorbidities were: diabetes mellitus 31.9 %, heart failure 53.4 %, respiratory failure 19.5 %, neurologic disability 33.8 %, and chronic kidney disease (stages III-IV) 57.7 %. Pneumonia was diagnosed in 54.4 %, urinary tract infection in 42.5 %, and other infections in 27 % of the patients. Two hundred forty-four patients (84.7 %) were admitted directly from home, 21 patients (7.3 %) were admitted to the hospital from a nursing home, and 23 patients (8.0 %) were referred from a chronic care facility/ hospice.

One hundred eighty-one (62.8 %) patients were healthcare facility - naïve (Group I), compared to 107 (37.2 %) healthcare facility - previously exposed patients (Group II). No significant differences between these two groups were recorded regarding patients’ age and gender as well as their comorbidities. Pneumonia was more frequently recorded in Group I (58.7 % vs 49.1 %, p =0.058). Bacteremia (22.4 % vs 11.1 %, p =0.009) and urinary tract infection (56.8 % vs 33.9 %, p <0.001) were significantly more prevalent among patients of Group II.

Among all laboratory parameters tested, the patients in Group II had significantly lower hemoglobin levels (10.55 g/L vs 11.34 g/L, p <0.001) and lower albumin (2.94 g/dL vs 3.34 g/dL, p <0.001), than patients in Group I.

Mortality positively correlated with age [p =0.041, 95 %CI (-4.6 - -0.1)]. Chronic kidney disease (73.3 % vs 53.4 %, p =0.006) and the presence of acute kidney injury at presentation or during the admission for sepsis (69.5 % vs 27.9 %, p <0.001) were the most significant prognostic factors for death. A previous admission within the preceding six months did not favor a worse outcome (32.3 % vs 30.1 %, p =0.743; Table 1). The duration of symptomatology before presentation correlated negatively with the outcome (p =0.041), probably indicating that severe sepsis causing alarming symptomatology usually ran a fulminant course. Among the other parameters tested, low mean arterial blood pressure (MAP), low bicarbonate levels, high lactate, hypernatremia, anemia, increased leucocyte counts, and hypoalbuminemia were all significantly associated with a worse outcome (Table 2). In the patients who survived, duration of hospital stay was not related to age, sex or present comorbidities, but was longer in the patients who had previously been healthcare facility exposed (9.7 vs 8.0 days, p =0.050). Prolongation of hospital stay was recorded in relation to increased serum creatinine (p =0.011) at presentation.

Discussion

The actual global burden of sepsis can only be estimated upon, as population-level epidemiologic data for sepsis is scarce, particularly for low- and middle-income countries14. The biggest part of the available research has dealt with the epidemiology of sepsis in specific high-risk populations, such as surgical patients postoperatively, patients in burn units, maternal and neonatal sepsis etc15. Recent studies have suggested that the global incidence of sepsis has been rising in the last decades16. However, carefully designed global population-based studies to assess the real burden of sepsis and its mortality are scarce.

This study is one of only few providing data about sepsis incidence and outcome on general medical wards17. Moreover, it addresses the elderly, an age group with several ominous features: high prevalence of comorbidities and a high frailty score18. Chronic neurologic disability has been associated with increased severity of sepsis in patients with other concomitant comorbidities19. In our setting, neurologic disability tended to negatively affect the outcome of sepsis in this cohort; however, chronic and acute deterioration of renal function were the strongest prognostic factors of death among the comorbidities included in the analysis20.

As the world population continues to age, frequent utilization of healthcare system will become increasingly more common in the elderly. Readmission for a secondary sepsis alone is common and has been associated with an unfavorable prognosis21. Hospitalizations for other causes have also been linked to a predisposition for a late (within 90 days) development of sepsis22. Regular users of different healthcare services may, as suggested by the results of this study, carry distinct clinical (worse nutritional status-anemia, hypoalbuminemia) and sepsis-associated features (higher incidence of bacteremia/urinary tract infection) compared to their community-derived counterparts. The previous hospitalization did not predict a worse clinical outcome. However, users of the healthcare system tended to have a worse prognosis. This could also partly be attributed to the fact that specific forms of sepsis, such as bacteremia, which associates with increased severity of sepsis and a higher incidence of death, was more frequently encountered in this group. The impact of previous healthcare facility exposure was more prominent on the duration of hospital stay, probably because of the higher frailty score of these particular patients. Established prognostic factors for the outcome of sepsis such as hypoalbuminemia, abnormal clotting tests, acidosis, severe anemia were capable to predict death/survival; as no significant difference in terms of outcome between the two groups could be proven, this effect was probably related to the severity of sepsis per se rather than a reflection of worsening physical condition. Other markers like C-reactive protein or fibrinogen did not, probably indicating an impaired systemic inflammatory response syndrome potentially masking the underlying clinical condition of the affected individuals23.

The elderly who are characterized by impaired physiological responses and little immune system resources represent a particular group for which general population guidelines and practices may not be directly applicable.

This study has several drawbacks. The patients that were included were not rated according to their sepsis severity. It was conducted in a large hospital covering for a densely-populated urban area. Well-designed multi-centered studies with larger numbers of enrolled patients are expected to provide a more concrete reflection of the size of the problem and the special features of this infectious syndrome in this cohort. Nevertheless, it describes a significant clinical problem of this particular age group and its components and addresses the impact of living characteristics of modern society on a continuously aging population.

Conflict of interest

Authors declare no conflict of interest related to this study. This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.

Acknowledgement

We wish to thank Dr Iordanis Romiopoulos, Prof. Konstantinos Petidis and Prof. Charalampos Antachopoulos for their valuable consultations on the patients’ diagnostic evaluation and medical care.

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