Abstract
Background
To examine the effects of percutaneous endoscopic gastrostomy (PEG) on quality of life (QOL) in patients with dementia.
Methods
We retrospectively included 53 Japanese community and tertiary hospitals to investigate the relationship between the newly developed PEG and consecutive dementia patients with swallowing difficulty between Jan 1st 2006 and Dec 31st 2008. We set improvements in 1) the level of independent living, 2) pneumonia, 3) peroral intake as outcome measures of QOL and explored the factors associated with these improvements.
Results
Till October 31st 2010, 1,353 patients with Alzheimer’s dementia (33.1%), vascular dementia (61.7%), dementia with Lewy body disease (2.0%), Pick disease (0.6%) and others were followed-up for a median of 847 days (mean 805 ± 542 days). A total of 509 deaths were observed (mortality 59%) in full-followed patients. After multivariate adjustments, improvement in the level of independent living was observed in milder dementia, or those who can live independently with someone, compared with advanced dementia, characterized by those who need care by someone: Odds Ratio (OR), 3.90, 95% confidence interval (95%CI), 1.59 - 9.39, P = 0.003. Similarly, improvement of peroral intake was noticed in milder dementia: OR, 2.69, 95%CI, 1.17 - 6.17, P = 0.02. Such significant associations were not observed in improvement of pneumonia.
Conclusions
These results suggest that improvement of QOL after PEG insertion may be expected more in milder dementia than in advanced dementia.
Keywords: Alzheimer’s dementia, Cerebrovascular dementia, Percutaneous endoscopic gastrostomy, Quality of life, Risk factor
Introduction
Percutaneous endoscopic gastrostomy (PEG) was initially developed as one of enteral nutrition techniques for patients with swallowing difficulty, because of reduced laryngopharyngeal discomfort and a lower risk of aspiration pneumonia compared with the nasogastric tube. Randomized studies in patients after stroke who received gastrostomy feeding have shown improved nutritional outcomes, higher likelihood of survival, and earlier discharge [1, 2]. Nowadays, numbers of PEG placement as well as its replacement are rapidly growing in Japanese aging society. In our previous study [3], using Cox proportional multi-variate analysis, we determined the risk and beneficial factors for death among Japanese geriatric patients with PEG including not only dementia but also other conditions in long term follow-up: Older ages, higher CRP and higher BUN were significant poor prognostic factors of death after PEG formation, whereas higher albumin, female gender and no previous history of ischemic heart disease were obviously better prognostic factors.
Although patients with advanced-dementia commonly develop feeding problems that lead to weight loss and nutritional deficiencies, they lack the capacity to express their wishes, thus leaving the decision of PEG usage up to family members and doctors. A Cochrane review showed no evidence of increased survival or improved quality of life (QOL) in patients with advanced dementia who were fed using gastrostomy tubes [4]. On the other hand, in a letter to the editor [5], Leeds et al implied that PEG in patients with early dementia (i.e., outpatient) may be beneficial compared to PEG in patients that have more advanced disease (i.e., inpatient). In our previous work [3], we surveyed geriatric patients with PEG and focused on long term survivals. However, in this study, we surveyed patients with dementia and focused on improvement of QOL and explored the factors associated with these improvements.
Patients and Methods
Study design and population
We conducted a retrospective cohort study of patients who underwent PEG between Jan 1st 2006 and Dec 31st 2008 at 46 community hospitals all over Japan, selected by a panel of 104 doctor-experts in PEG and the trustees of PEG Doctors’ Network, a non-profit organization, which was approved by the institutional review board in each hospital. Doctors in charge of PEG in the selected hospitals were asked to examine patients with dementia with a new PEG, after excluding patients 1) who had gastrectomy in previous history, 2) who had cancer considered to affect the patient’s prognosis, 3) who were performed the gastrostomy without reason of nutrition-support. The doctors were further asked to report the number of excluded cases as well as the number of patients who were considered as loss to follow-up.
Outcome measure
The primary endpoint was the improvement in 1) the level of independent living, 2) pneumonia, 3) peroral intake as outcome measures of QOL and the factors associated with these improvements were also explored. The level of independent living of the demented elderly was defined by Japanese Ministry of Health, Labor and Welfare [6, 7] (Table 1).
Table 1. The Level of Independent Living of Demented Elderly.
| I | Daily living is almost independent in family and community |
| II | There are some difficulties in daily life due to dementia-specific signs, behavior and communication, but the person can live independently with someone. |
| IIa | The difficulties are observed outside of home |
| IIb | The difficulties are observed inside of home |
| III | Difficulties in daily life due to dementia-specific signs, behavior and communication are sometimes observed, and the person needs care by someone. |
| IIIa | The difficulties are observed outside of home |
| IIIb | The difficulties are observed inside of home |
| IV | Difficulties in daily life due to dementia-specific signs, behavior and communication are frequently observed, and the person always needs care by someone. |
| M | Due to serious mental illness and problematic behavior or diseases, the person needs medical care by specialists. |
The secondary outcome was set as death and the cutoff date was set at October 2010. In the case where the patient was alive, the doctor was further asked the status of the patient which was selected from the following: a) admission in the current hospital, b) admission in another hospital, c) stay at nursery home, d) stay at home, e) others. In case of loss to follow-up, the final date the patient was confirmed as alive was set a censor.
Variables
Following data: 1) age, 2) gender, 3) height, 4) weight, 5) body temperature, 6) white blood cell (WBC/uL), 7) hematocrit (Ht): %, 8) hemoglobin (Hg): g/dL, 9) aspartate aminotransferase (AST): IU/L, 10) alanine aminotransferase (ALT): IU/L, 11) blood urine nitrogen (BUN): mg/dL, 12) creatinin (Cr): mg/dL, 13) albumin: g/dL, 14) C-reactive protein (CRP): mg/dL, 15) previous history of pneumonia, ischemic heart disease, 16) comorbidity of diabetes, serious malnutrition judged by the doctor in charge, 17) starvation period before making PEG: none, within 1 week, within 1 month, more than 1 month, 18) primary type of dementia executable for PEG, selected from the following: a) Alzheimer’s dementia, b) cerebrovascular dementia, c) Dementia with Lewy bodies, d) Pick disease, e ) other type of dementia.
Statistics analysis
Student’s t-test and Mann-Whitney test were performed for continuous variables with normal and not normal distribution, respectively. Chi-square test was calculated for dichotomous outcomes. Primary outcome was evaluated with multiple logistic regression models with multi-variate adjustments using odds ratio (OR) and 95% confidence intervals (95%CI). Cox proportional hazard models were fitted for either single or multivariate analysis using variables significant at single analyses. All statistical analyses were performed using STATA 11.0 (STATA Corp., College Station, TX). P < 0.05 was considered statistically significant.
Results
Of the 1,353 patients who underwent PEG at the selected 53 hospitals. Their mean age was 81.9 years old, which ranged from 23 to 104. Females were predominant (60%). The distribution of primary diagnosis executable for PEG was as follows: Cerebrovascular dementia, 62%: Alzheimer’s dementia, 33%, dementia with Lewy bodies, 2%. In the previous history, pneumonia and ischemic heart disease were reported at 68% and 16%, respectively. Moreover, comorbidity of diabetes, hypertension, dyslipidemia, was 16%, 41%, and 10%. In 865 patients who were able to be fully followed-up, 509 deaths were observed (mortality 59%). Among 1027 patients including cases censored by moving to other hospitals, 99%, 95%, 90%, 75% and 50% survived more than 11 days, 32 days, 65 days, 268 days and 847 days, respectively.
In total, 509 deaths were observed, of which 8 deaths (1.6% of total death) occurred within 7 days, 50 (9.8%) within 30 days, 99 (19%) within 60 days, 207 (41%) within a half year, and 305 (60%) within one year. Seven deaths were considered as PEG related deaths, according to the reported doctors. On the other hand, among 28 surviving patients (6.5%), PEG was removed. Among the 1,353 patients, 879, 961 and 777 patients were evaluated for improvement of the level of independent living of the demented elderly, peroral intake, and pneumonia, respectively.
First, variables of demographic and laboratory data at PEG installation were compared between improved and not improved patients in the level of independent living of the demented elderly (Table 2). Only Age was the significant factor and younger patients had improved levels as opposed to older patients. Improvement of the level of independent living was assessed by stratification with the level of independent living at the beginning of PEG (Table 3). Dementia stages IIa and IIb showed a significantly higher ratio (OR = 3.9, 95%CI, 1.6 to 9.4, P = 0.003) compared with dementia stages IIIa and IIIb, even after adjustment with age, which was significantly associated with improvement of the level of independent living.
Table 2. Patients’ Characteristics at Making PEG Stratified by the Level of Independent Living of Demented Elderly.
| Variable | Total (N = 879) | Improved (N = 75) | Not improved (N = 804) | P-value |
|---|---|---|---|---|
| Age (years) mean ± s.d. | 81.8 ± 9.4 | 79.5 ± 13.0 | 82.0 ± 8.9 | 0.02*1 |
| Body Temperature (°C) mean ± s.d. | 36.8 ± 0.6 | 36.8 ± 0.5 | 36.8 ± 0.6 | 0.68*1 |
| WBC ( /uL) | 7026 ± 2567 | 7354 ± 2593 | 6995 ± 2564 | 0.12*2 |
| CRP (mg/dL) | 1.86 ± 2.40 | 1.81 ± 2.10 | 1.87 ± 2.42 | 0.73*2 |
| Hb (g/dL) | 11.1 ± 1.9 | 11.2 ± 1.9 | 11.1 ± 1.9 | 0.49*2 |
| ALT (IU/L) | 29.8 ± 26.5 | 25.8 ± 12.5 | 30.2 ± 27.4 | 0.46*2 |
| BUN (mg/dL) | 21.6 ± 13.7 | 20.7 ± 12.2 | 21.8 ± 14.1 | 0.60*2 |
| Cr (mg/dL) | 0.84 ± 1.15 | 0.80 ± 0.86 | 0.85 ± 1.21 | 0.05*2 |
| Albumin (g/dL) | 3.01 ± 0.57 | 3.03 ± 0.58 | 3.01 ± 0.55 | 0.88*2 |
| Total cholesterol (mg/dL) | 157.2 ± 40.8 | 162.3 ± 38.6 | 156.0 ± 41.2 | 0.58*2 |
| male | 359 (41%) | 32 (43%) | 327 (40%) | 0.70*3 |
| Previous history of pneumonia | 587 (68%) | 50 (68%) | 537 (68%) | 0.94*3 |
| Hypertension | 348 (40%) | 35 (47%) | 313 (39%) | 0.18*3 |
| Dyslipidemia | 77 (9%) | 9 (13%) | 68 (9%) | 0.28*3 |
| Arteriosclerosis obliterans | 31 (3.7%) | 5 (6.9%) | 26 (3.4%) | 0.14*3 |
| Able to take perorally | 324 (37%) | 31 (41%) | 293 (37%) | 0.44*3 |
| Diabetes | 124 (14%) | 11 (15%) | 113 (14%) | 0.90*3 |
| Previous history of cardiovascular disease | 134 (16%) | 12 (16%) | 122 (16%) | 0.91*3 |
| Extremely poor nutritional status | 170 (20%) | 16 (22%) | 154 (19%) | 0.66*3 |
| Fasting period prior to operation | 0.72*3 | |||
| None | 189 (28%) | 12 (25%) | 177 (29%) | |
| Within one week | 292 (44%) | 24 (50%) | 268 (43%) | |
| Within one month | 177 (27%) | 12 (25%) | 165 (27%) | |
| More than one month | 8 (1.2%) | 0 (0%) | 8 (1.3%) | |
| Alzheimer’s dementia | 292 (33%) | 27 (36%) | 265 (33%) | 0.56*3 |
| Cerebrovascular dementia | 554 (63%) | 43 (57%) | 511 (63%) | 0.33*3 |
| Dementia with Lewy bodies | 15 (1.7%) | 1 (1.3%) | 14 (1.7%) | 0.80*3 |
*1. Student’s t-test was applied because the distribution was considered as normal. *2. Mann-Whitney U test was applied because the distribution was considered as not normal. *3. Chi-square test was applied.
Table 3. Improvement of the Level of Independent Living Stratified by the Level of Independent Living at Making PEG.
| Variable | I | IIa/IIb | IIIa/IIIb/IV | M |
|---|---|---|---|---|
| No. of improved patients/no. of total patients (%) | 0/2 (0) | 8/32 (25) | 32/375 (8.6) | 7/57 (12) |
| Odds Ratio (95% confidence interval)* | - | 3.90 | 1 | 1.36 |
| P-value | (1.59 - 9.39) | (0.56 - 3.30) | ||
| 0.003 | 0.50 |
*Odds Ratio was adjusted with age, which was associated with the outcome.
Next, variables of demographic and laboratory data at PEG installation were compared between improved and not improved patients in ability of peroral intake (Table 4). Patients with dyslipidemia and ability of peroral intake tended to have improved in the level of independent living. Patients with Alzheimer’s dementia improved significantly more than those with cerebrovascular dementia. Improvement of the peroral intake was assessed by stratification with the level of independent living at the beginning of PEG (Table 5). Dementia stages IIa and IIb showed a significantly higher ratio (OR = 2.7, 95%CI, 1.1 to 6.2, P = 0.02) as compared with dementia stages IIIa and IIIb, even after adjustment with dyslipidemia, peroral intake, Alzheimer’s dementia and cerebrovascular dementia that were significantly associated with improvement of the level of independent living.
Table 4. Patients’ Characteristics at Making PEG Stratified by the Improvement of Peroral Intake.
| Variable | Total (N = 961) | Improved (N = 177) | Not improved (N = 784) | P-value |
|---|---|---|---|---|
| (Age years) mean ± s.d. | 81.7 ± 9.3 | 80.6 ± 11.1 | 82.0 ± 8.8 | 0.07*1 |
| Body Temperature (°C) mean ± s.d. | 36.8 ± 0.6 | 36.8 ± 0.6 | 36.8 ± 0.6 | 0.12*1 |
| WBC ( /µL) | 7041 ± 2702 | 6869 ± 2364 | 7080 ± 2773 | 0.62*2 |
| CRP (mg/dL) | 1.90 ± 2.38 | 1.69 ± 2.08 | 1.95 ± 2.45 | 0.39*2 |
| Hb (g/dL) | 11.6 ± 1.9 | 11.1 ± 2.1 | 11.1 ± 1.9 | 0.99*2 |
| ALT (IU/L) | 30.4 ± 28.7 | 29.6 ± 34.7 | 30.6 ± 27.2 | 0.13*2 |
| BUN (mg/dL) | 21.5 ± 13.8 | 21.3 ± 14.9 | 21.5 ± 13.7 | 0.94*2 |
| Cr (mg/dL) | 0.83 ± 1.16 | 0.70 ± 0.36 | 0.84 ± 1.20 | 0.09*2 |
| Albumin (g/dL) | 3.02 ± 0.57 | 3.03 ± 0.46 | 3.02 ± 0.58 | 0.52*2 |
| Total cholesterol (mg/dL) | 157.5 ± 40.6 | 160.7 ± 37.1 | 157.2 ± 40.8 | 0.14*2 |
| male | 396 (41%) | 66 (37%) | 330 (42%) | 0.24*3 |
| Previous history of pneumonia | 645 (68%) | 107 (62%) | 538 (70%) | 0.051*3 |
| Hypertension | 389 (41%) | 78 (45%) | 311 (40%) | 0.29*3 |
| Dyslipidemia | 88 (10%) | 30 (17%) | 58 (8%) | < 0.001*3 |
| Arteriosclerosis obliterans | 31 (3.4%) | 8 (4.7%) | 23 (3.1%) | 0.29*3 |
| Able to take perorally | 350 (37%) | 95 (54%) | 255 (33%) | < 0.001*3 |
| Diabetes | 150 (16%) | 35 (20%) | 115 (15%) | 0.093*3 |
| Previous history of cardiovascular disease | 152 (16%) | 29 (17%) | 123 (16%) | 0.80*3 |
| Extremely poor nutritional status | 189 (20%) | 39 (22%) | 147 (19%) | 0.34*3 |
| Fasting period prior to operation | 0.11*3 | |||
| None | 216 (30%) | 46 (34%) | 170 (29%) | |
| Within one week | 316 (43%) | 65 (47%) | 251 (42%) | |
| Within one month | 188 (26%) | 25 (18%) | 163 (27%) | |
| More than one month | 12 (1.6%) | 1 (0.7%) | 11 (1.9%) | |
| Alzheimer’s dementia | 310 (32%) | 76 (43%) | 234 (30%) | 0.001*3 |
| Cerebrovascular dementia | 610 (63%) | 95 (53%) | 515 (65%) | 0.003*3 |
| Dementia with Lewy bodies | 18 (1.9%) | 2 (1.1%) | 16 (2.0%) | 0.42*3 |
*1. Student’s t-test was applied because the distribution was considered as normal. *2. Mann-Whitney U test was applied because the distribution was considered as not normal. *3. Chi-square test was applied.
Table 5. Improvement of Peroral Intake Stratified by the Level of Independent Living at Making PEG.
| Variable | I | IIa/IIb | IIIa/IIIb/IV | M |
|---|---|---|---|---|
| No. of improved patients/no. of total patients (%) | 1/2 (50) | 12/34(35) | 70/419 (17) | 13/62 (21) |
| Odds Ratio (95% confidence interval)* | - | 2.69 | 1 | 1.39 |
| P-value | (1.17 – 6.17) | (0.70 -2.77) | ||
| 0.02 | 0.35 |
*Odds Ratio was adjusted with dyslipidemia, able to take perorally, Alzheimer’s dementia, and cerebrovascular dementia, which were associated with the outcome.
Then, variables of demographic and laboratory data at PEG installation were compared between improved and not improved patients with pneumonia (Table 6). Patients who have previous history of pneumonia or cardiovascular disease as well as dyslipidemia and/or diabetes had more improvement in pneumonia. Improvement of pneumonia was assessed by stratification with the level of independent living at PEG installation (Table 7). However, improvement of pneumonia in dementia with IIa and IIb was not significantly different from that in dementia with IIIa and IIIb, even after adjustment with dyslipidemia, peroral intake, Alzheimer’s dementia and cerebrovascular dementia which were factors significantly associated with improvement of the level of independent living.
Table 6. Patients’ Characteristics at Making PEG Stratified by the Improvement of Pneumonia.
| Variable | Total (N = 777) | Improved (N = 557) | Not improved (N = 220) | P-value |
|---|---|---|---|---|
| Age (years) mean ± s.d. | 82.1 ± 9.0 | 82.1 ± 9.3 | 81.9 ± 8.4 | 0.73*1 |
| Body Temperature (°C) mean ± s.d. | 36.8 ± 0.6 | 36.8 ± 0.6 | 36.8 ± 0.6 | 0.79*1 |
| WBC (/µL) | 7101 ± 2745 | 7222 ± 2847 | 6797 ± 2454 | 0.08*2 |
| CRP (mg/dL) | 2.01 ± 2.45 | 2.00 ± 2.43 | 2.05 ± 2.04 | 0.85*2 |
| Hb (g/dL) | 11.0 ± 1.9 | 11.0 ± 1.8 | 10.9 ± 2.0 | 0.47*2 |
| ALT(IU/L) | 30.7 ± 29.5 | 30.6 ± 30.7 | 30.7 ± 26.4 | 0.60*2 |
| BUN (mg/dL) | 21.5 ± 13.4 | 21.3 ± 12.7 | 21.8 ± 14.9 | 0.63*2 |
| Cr (mg/dL) | 0.84 ± 1.15 | 0.85 ± 1.17 | 0.83 ± 1.09 | 0.92*2 |
| Albumin (g/dL) | 2.98 ± 0.58 | 2.97 ± 0.54 | 3.01 ± 0.68 | 0.69*2 |
| Total cholesterol (mg/dL) | 155.5 ± 40.3 | 154.5 ± 40.1 | 158.1 ± 40.8 | 0.29*2 |
| male | 343 (44%) | 240 (43%) | 103 (46%) | 0.38*3 |
| Previous history of pneumonia | 628 (81%) | 480 (86%) | 148 (69%) | <0.001*3 |
| Hypertension | 315 (41%) | 225 (41%) | 90 (41%) | 0.99*3 |
| Dyslipidemia | 73 (10%) | 61 (11%) | 12 (6%) | 0.015*3 |
| Arteriosclerosis obliterans | 28 (3.8%) | 19 (3.6%) | 9 (4.2%) | 0.70*3 |
| Able to take perorally | 270 (35%) | 188 (34%) | 82 (38%) | 0.29*3 |
| Diabetes | 113 (15%) | 93 (17%) | 20 (9%) | 0.006*3 |
| Previous history of cardiovascular disease | 121 (16%) | 98 (18%) | 23 (11%) | 0.01*3 |
| Extremely poor nutritional status | 158 (21%) | 106 (20%) | 52 (24%) | 0.20*3 |
| Fasting period prior to operation | ||||
| None | 170 (29%) | 130 (32%) | 40 (24%) | |
| Within one week | 244 (42%) | 147 (36% | 97 (57%) | |
| Within one month | 159 (27%) | 130 (32%) | 29 (17%) | |
| More than one month | ||||
| Alzheimer’s dementia | 248 (32%) | 182 (33%) | 66 (30%) | 0.45*3 |
| Cerebrovascular dementia | 484 (62%) | 340 (61%) | 144 (65%) | 0.28*3 |
| Dementia with Lewy bodies | 13 (1.7%) | 10 (1.8%) | 3 (1.4%) | 0.67*3 |
*1. Student’s t-test was applied because the distribution was considered as normal. *2. Mann-Whitney U test was applied because the distribution was considered as not normal. *3. Chi-square test was applied.
Table 7. Improvement of Pneumonia Stratified by the Level of Independent Living at Making PEG.
| Variable | I | IIa/IIb | IIIa/IIIb/IV | M |
|---|---|---|---|---|
| No. of improved patients/no. of total patients (%) | 1/1 (100) | 18/27 (67) | 229/351 (65) | 30/50 (60) |
| Odds Ratio (95% confidence interval)* | - | 1.33 | 1 | 0.61 |
| P-value | (0.45 - 3.89) | (0.28 - 1.31) | ||
| 0.60 | 0.20 |
*Odds Ratio was adjusted with previous history of pneumonia, dyslipidemia, diabetes, previous history of cardiovascular disease and fasting period prior to operations, which were associated with the outcome.
Finally, using variables significant in above analyses, Cox proportional hazard models were computed in single- and multi-variate analyses (Table 8). In single variate hazard models, patients with older ages, male patients, higher CRP, AST and BUN did show a significantly enhanced crude hazard ratio, whereas higher Hb, albumin, and total cholesterol reduced the crude hazard ratio. Moreover, history of pneumonia or ischemic heart disease and extremely poor nutritional status increased, but ability of peroral intake significantly decreased crude hazard ratios of death. However, in a multivariate hazard model using significant factors in single variate analyses, older ages, higher BUN, lower albumin, male gender and diabetes were significant risk factors of death after PEG formation.
Table 8. Cox Proportional Hazard Models.
| Variable | Single-variate analyses | Multivariate analysis | ||||
|---|---|---|---|---|---|---|
| Crude HR | 95% CI | P value | AHR | 95% CI | P value | |
| Age (year) | 1.03 | 1.02 - 1.04 | < 0.001 | 1.04 | 1.02 - 1.06 | < 0.001 |
| Body mass index (kg/m2) | 0.96 | 0.93 - 0.99 | 0.04 | 0.98 | 0.94 - 1.03 | 0.46 |
| Body Temperature (°C) | 0.93 | 0.80 - 1.09 | 0.39 | |||
| WBC (/uL) | 1.00 | 0.99 - 1.00 | 0.31 | |||
| CRP (mg/dL) | 1.07 | 1.03 - 1.10 | < 0.001 | 1.00 | 0.95 - 1.06 | 0.86 |
| Hb (g/dL) | 0.88 | 0.84 - 0.92 | < 0.001 | 1.03 | 0.94 - 1.14 | 0.48 |
| ALT (IU/L) | 1.00 | 1.00 - 1.01 | 0.001 | 1.00 | 0.99 - 1.01 | 0.10 |
| BUN (mg/dL) | 1.02 | 1.01 - 1.02 | < 0.001 | 1.02 | 1.01 - 1.03 | < 0.001 |
| Cr (mg/dL) | 1.04 | 0.98 - 1.11 | 0.23 | 0.94 | 0.84 - 1.06 | 0.30 |
| Albumin (g/dL) | 0.64 | 0.55 - 0.76 | < 0.001 | 0.51 | 0.36 - 0.73 | < 0.001 |
| Total cholesterol (mg/dL) | 0.99 | 0.99 - 1.00 | 0.001 | 1.00 | 0.99 - 1.00 | 0.90 |
| Male | 1.56 | 1.31 - 1.86 | < 0.001 | 2.01 | 1.49 - 2.92 | < 0.001 |
| Previous history of pneumonia | 1.42 | 1.16 - 1.73 | 0.001 | 1.10 | 0.79 - 1.54 | 0.56 |
| level of independent living of demented elderly | 1.05 | 0.97 - 1.15 | 0.25 | |||
| Hypertension | 1.17 | 0.98 - 1.39 | 0.09 | |||
| Dyslipidemia | 1.20 | 0.91 - 1.60 | 0.20 | |||
| Arteriosclerosis obliterans | 1.21 | 0.78 - 1.88 | 0.39 | |||
| Able to take perorally | 0.76 | 0.63 - 0.92 | 0.004 | 0.82 | 0.59 - 1.12 | 0.21 |
| Diabetes | 1.61 | 1.29 - 1.99 | 0.10 | 2.17 | 1.46 - 3.25 | < 0.001 |
| Previous history of cardiovascular disease | 1.45 | 1.16 - 1.81 | 0.001 | 1.09 | 0.73 - 1.65 | 0.67 |
| Extremely poor nutritional status | 1.40 | 1.13 - 1.73 | 0.002 | 1.31 | 0.92 - 1.88 | 0.14 |
| Fasting period prior to operation | 1.05 | 0.98 - 1.11 | 0.14 | |||
| Alzheimer’s dementia | 0.93 | 0.78 - 1.12 | 0.47 | |||
| Cerebrovascular dementia | 1.17 | 0.98 - 1.41 | 0.08 | |||
| Dementia with Lewy bodies | 0.81 | 0.40 - 1.63 | 0.55 | |||
| Level of independent living | ||||||
| I | - | - | ||||
| IIa/IIb | 0.59 | 0.34 - 1.00 | ||||
| IIIa/IIIb | - | - | ||||
| M | 1.03 | 0.72 - 1.47 | ||||
*Adjusted for all the variables listed in the table. HR, hazard ratio; CI, confidence interval; AHR, adjusted hazard ratio.
Discussion
In this study, improvement in the level of independent living was observed in 8.5% of the whole and in 25% of milder dementia, or those who can live independently with someone, compared with 8.6% of advanced dementia, or those who need care by someone. The difference was almost 4 times between mild and advanced dementia, even after multivariate adjustment. Similarly, improvement of peroral intake was noticed in 18.4% of the whole and in 35% of the milder dementia, compared with 17% of advanced dementia. The difference was 2.7 times between them. Thus, severity of dementia may be a very important factor in the decision making of PEG formation. Improvement of pneumonia was observed in 72% of all patients who inserted PEG, but such significant associations with the level of dementia were not observed in the improvement of pneumonia. Yokoyama et al showed that a total of 15% of PEG cases were able to ingest orally after PEG [8], of which ratio was close to our data of 18%.
For survival analysis, more than half of dementia patients treated with PEG may survive more than 2.3 years, which is almost equivalent to our previous study [3] and better than a previous retrospective study of 361 patients which found that patients with dementia who had a PEG inserted had higher mortality than other patient subgroups (54% 30 day mortality and 90% at one year) [9]. In a multi-variate Cox hazard model, older age, male gender, comorbidity of diabetes, higher BUN and lower albumin were significant risk factors of death, which is not inconsistent with our previous results [3] and others [10, 11]. Of interest, important factors to predict improvement of QOL after PEG insertion such as levels of dementia and underlying disease of dementia were not included in these prognostic factors.
When the dementia levels are mild for patients enough to live independently with someone, insertion of PEG may improve the level of independent living and ability of peroral intake. However, these improvements were observed in some cases of advanced dementia. Moreover, prognostic factors for survival were different from key factors in improvement of QOL. In addition to these evidences, moral and ethical issues, as well as respecting the patient’s wishes should be considered in the decision making of PEG insertion. As Kurien et al [12] insisted, guidelines exist to aid clinicians in making decisions on PEG feeding, but the decision to insert a PEG tube should always be made on an individual basis.
The results of this study should be interpreted in the context of the study strengths and limitations. We researched in multiple community and tertiary hospitals spread over Japan, which enhanced generalizability. To minimize selection bias, collaborating doctors were asked to choose 20 consecutive patients. The sample size was 1,353 and the results of the statistical analyses were considered relatively robust. On the other hand, due to the retrospective nature of the study, we could collect only basic clinical information that might include recall bias in areas such as previous histories and diagnosis of underlying diseases. Most importantly, because this study is not randomized and just a single arm of PEG insertion, we can not conclude the superiority of PEG to nasogastric tube and peroral feeding.
In conclusion, these results suggest the following in QOL of patients: the level of independent living and peroral intake improved in patients with milder dementia, compared with patients with advanced dementia.
Acknowledgments
The source of financial grant: Health Labour Sciences Research Grant.
References
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