The mortality burden of frailty in hip fracture patients: a nationwide retrospective study of cause-specific mortality
verfasst von:
Maximilian Peter Forssten, Ahmad Mohammad Ismail, Ioannis Ioannidis, Per Wretenberg, Tomas Borg, Yang Cao, Marcelo A. F. Ribeiro Jr., Shahin Mohseni
Frailty is a condition characterized by a reduced ability to adapt to external stressors because of a reduced physiologic reserve, which contributes to the high risk of postoperative mortality in hip fracture patients. This study aims to investigate how frailty is associated with the specific causes of mortality in hip fracture patients.
Methods
All adult patients in Sweden who suffered a traumatic hip fracture and underwent surgery between 2008 and 2017 were eligible for inclusion. The Orthopedic Hip Frailty Score (OFS) was used to classify patients as non-frail (OFS 0), pre-frail (OFS 1), and frail (OFS ≥ 2). The association between the degree of frailty and both all-cause and cause-specific mortality was determined using Poisson regression models with robust standard errors and presented using incidence rate ratios (IRRs) with corresponding 95% confidence intervals (CIs), adjusted for potential sources of confounding.
Results
After applying the inclusion and exclusion criteria, 127,305 patients remained for further analysis. 23.9% of patients were non-frail, 27.7% were pre-frail, and 48.3% were frail. Frail patients exhibited a 4 times as high risk of all-cause mortality 30 days [adj. IRR (95% CI): 3.80 (3.36–4.30), p < 0.001] and 90 days postoperatively [adj. IRR (95% CI): 3.88 (3.56–4.23), p < 0.001] as non-frail patients. Of the primary causes of 30-day mortality, frailty was associated with a tripling in the risk of cardiovascular [adj. IRR (95% CI): 3.24 (2.64–3.99), p < 0.001] and respiratory mortality [adj. IRR (95% CI): 2.60 (1.96–3.45), p < 0.001] as well as a five-fold increase in the risk of multiorgan failure [adj. IRR (95% CI): 4.99 (3.95–6.32), p < 0.001].
Conclusion
Frailty is associated with a significantly increased risk of all-cause and cause-specific mortality at 30 and 90 days postoperatively. Across both timepoints, cardiovascular and respiratory events along with multiorgan failure were the most prevalent causes of mortality.
Hinweise
Congress Presentation: This study has been submitted for presentation at the upcoming European Congress of Trauma & Emergency Surgery (ECTES) in Ljubljana, Slovenia 2023.
Introduction
Frailty is a condition characterized by a reduced ability to adapt to external stressors because of a reduced physiologic reserve pursuant to the degeneration of multiple organ systems. As a result, frail patients are at a disproportionate risk of morbidity, disability and mortality [1‐4]. While frailty increases with advancing age, it is not synonymous with old age, but rather an independent condition which has been found to be superior to a patient’s chronological age in predicting worse outcomes after surgery [5‐7]. Frailty is particularly prevalent among hip fracture patients and may explain a substantial portion of the excess mortality observed in this patient population [8‐12]. Subsequently, frailty appears to be a useful means of stratifying hip fracture patients. Using frailty, each patient’s risk of mortality may be estimated in ordered to identify high risk individuals with a disproportionate risk of postoperative mortality [13].
The ability to identify high risk patients will become increasingly important. Both the incidence of hip fractures as well as conditions associated with frailty such as dementia are projected to increase markedly as the average age of the human population continues to increase [14‐17]. Simultaneously, hospital resources are predicted to become progressively strained over the same time period [18‐21]. This will necessitate new, quick and efficient methods for allocating resources to those with the greatest need or restrictions in non-futile care. As part of this process, a better understanding is required of the most vulnerable patients, such as those that are frail. Previous investigations have studied the relationship between frailty and postoperative mortality after hip fracture surgery [8‐12]. However, with the aid of Orthopedic Hip Frailty Score (OFS), this is the first study that aims to investigate how frailty is associated with cause-specific mortality in hip fracture patients.
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Methods
This study included all adult patients who underwent hip fracture surgery between 2008 and 2017, who had been registered in the Swedish National Quality Registry for Hip Fracture Patients, Rikshoft [22]. In order to reduce heterogeneity in the study population, pathological fractures, reoperations, and conservatively managed patients were excluded. Patients were also excluded if the data required for calculating the OFS was missing. The Swedish National Quality Registry for Hip Fracture Patients was queried for variables pertaining to the demographic, clinical, and operative characteristics of each patient; this included factors such as age, sex, American Society of Anesthesiologist (ASA) classification, type of fracture and type of surgery. By cross-referencing patients' Swedish social security number, comorbidity and morbidity data were acquired from the Swedish National Board of Health and Welfare Patient and Cause of Death registers and combined with the original dataset. This study was performed with the approval of the Swedish Ethical Review Authority (reference 2022-03107-02) in accordance with both the STROBE guidelines and the Declaration of Helsinki [23].
Calculating the Orthopedic Hip Frailty Score
The OFS, a newly validated score for measuring frailty in hip fracture patients, was calculated based on the following variables: the presence of congestive heart failure, a history of malignancy (local or metastatic, excluding non-invasive skin cancer), institutionalization, non-independent functional status (i.e., requiring assistance with activities of daily life), and an age ≥ 85. A patient received 1 point for each variable, with the maximum possible score being 5. According to the original study, patients with an OFS ≥ 2 were considered frail [13].
Statistical analysis
Patients were divided into three cohorts based on their OFS: non-frail (OFS 0), pre-frail (OFS 1), and frail (OFS ≥ 2). Demographics, clinical characteristics, and outcomes were summarized using a median and interquartile range (IQR) for non-normally distributed continuous variables and counts and percentages for categorical variables. The statistical significance of differences between these cohorts was evaluated using the Kruskal–Wallis test, or Chi-squared/Fisher's exact test, whichever was appropriate. The primary outcome was all-cause mortality, while secondary outcomes consisted of cause-specific mortality (cardiovascular, respiratory, cerebrovascular, sepsis, multiorgan failure, unknown). Mortality was evaluated after 30 days and 90 days postoperatively.
The association between frailty and 30 days as well as 90 days mortality (all-cause and cause-specific) was evaluated using Poisson regression models with robust standard errors. These models were adjusted for age, sex, ASA classification, type of fracture, type of surgery, myocardial infarction, cerebrovascular disease, peripheral vascular disease, diabetes mellitus, chronic kidney disease, chronic obstructive pulmonary disease, connective tissue disease, and liver disease. Results for these analyses are presented as incidence rate ratios (IRRs) with corresponding 95% confidence intervals (CIs).
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Multiple imputation by chained equations was used to handle missing data; logistic regression was used for binary variables, Bayesian polytomous regression was used for nominal variables, and proportional odds models were used for ordinal variables. Analyses were performed using the tidyverse, haven, parallel, mice, robustbase, writexl, and rlist packages in the statistical software R 4.1.3 (R Foundation for Statistical Computing, Vienna, Austria) [24]. In all analyses, a two-sided p value less than 0.05 was considered statistically significant.
Results
After applying the inclusion and exclusion criteria 127,305 patients remained for further analysis (Fig. 1). 23.9% of patients (N = 30,463) were non-frail, 27.7% (N = 35,312) were pre-frail, while 48.3% (N = 61,530) had an OFS ≥ 2 and were therefore considered frail [13]. Compared to non-frail patients, pre-frail and frail patients were on average older (82 years and 88 years vs 75 years, p < 0.001), slightly more often female (67.6% and 69.6% vs 65.4% p < 0.001), and less fit for surgery according to their ASA classification (ASA ≥ 3: 54.5% and 71.0% vs 44.5%, p < 0.001). Pre-frail and frail were significantly more likely to undergo a hemiarthroplasty (27.9% and 29.2% vs 15.5%, p < 0.001) than a total hip replacement (7.7% and 2.4% vs 17.9%, p < 0.001) compared to non-frail patients. The majority of frail patients were older than 85 (76.2%) and had a non-independent functional status (85.4%). All comorbidities, except for liver disease and connective tissue diseases, were significantly more prevalent among frail patients. (Table 1).
Table 1
Demographics and clinical characteristics of non-frail, pre-frail, and frail hip fracture patients
Non-frail patients
(N = 30,463)
Pre-frail patients
(N = 35,312)
Frail patients
(N = 61,530)
p value
Age, median [IQR]
75 [68–80]
82 [76–87]
88 [85–91]
< 0.001
Sex, n (%)
Female
19,915 (65.4)
23,863 (67.6)
42,825 (69.6)
< 0.001
Male
10,543 (34.6)
11,446 (32.4)
18,702 (30.4)
Missing
5 (0.0)
3 (0.0)
3 (0.0)
ASA classification, n (%)
1
4225 (13.9)
1341 (3.8)
927 (1.5)
< 0.001
2
15,791 (51.8)
14,267 (40.4)
16,168 (26.3)
3
9275 (30.4)
17,068 (48.3)
36,543 (59.4)
4
675 (2.2)
2,143 (6.1)
7,058 (11.5)
5
11 (0.0)
23 (0.1)
89 (0.1)
Missing
486 (1.6)
470 (1.3)
745 (1.2)
Type of fracture, n (%)
Non-displaced cervical (garden 1–2)
4897 (16.1)
4582 (13.0)
7418 (12.1)
< 0.001
Displaced cervical (garden 3–4)
12,048 (39.5)
13,625 (38.6)
21,766 (35.4)
Basicervical
945 (3.1)
1101 (3.1)
2225 (3.6)
Peritrochanteric (two fragments)
5363 (17.6)
7008 (19.8)
13,327 (21.7)
Peritrochanteric (multiple fragments)
4546 (14.9)
6198 (17.6)
11,925 (19.4)
Subtrochanteric
2652 (8.7)
2782 (7.9)
4848 (7.9)
Missing
12 (0.0)
16 (0.0)
21 (0.0)
Type of surgery, n (%)
Pins or screws
6764 (22.2)
5619 (15.9)
9692 (15.8)
< 0.001
Screws or pins with sideplate
7093 (23.3)
9188 (26.0)
17,170 (27.9)
Intramedullary nail
6435 (21.1)
7900 (22.4)
15,214 (24.7)
Hemiarthroplasty
4710 (15.5)
9869 (27.9)
17,974 (29.2)
Total hip replacement
5446 (17.9)
2727 (7.7)
1451 (2.4)
Missing
15 (0.0)
9 (0.0)
29 (0.0)
OFS, n (%)
0
30,463 (100.0)
0 (0.0)
0 (0.0)
< 0.001
1
0 (0.0)
35,312 (100.0)
0 (0.0)
2
0 (0.0)
0 (0.0)
33,798 (54.9)
3
0 (0.0)
0 (0.0)
21,859 (35.5)
4
0 (0.0)
0 (0.0)
5428 (8.8)
5
0 (0.0)
0 (0.0)
445 (0.7)
Congestive heart failure, n (%)
0 (0.0)
2496 (7.1)
17,158 (27.9)
< 0.001
History of malignancy, n (%)
0 (0.0)
4391 (12.4)
12,215 (19.9)
< 0.001
Institutionalized, n (%)
0 (0.0)
2,700 (7.6)
28,280 (46.0)
< 0.001
Non-independent functional status, n (%)
0 (0.0)
13,343 (37.8)
52,574 (85.4)
< 0.001
Age ≥ 85, n (%)
0 (0.0)
12,382 (35.1)
46,883 (76.2)
< 0.001
Myocardial infarction, n (%)
768 (2.5)
1,651 (4.7)
5161 (8.4)
< 0.001
Cerebrovascular disease, n (%)
3017 (9.9)
6021 (17.1)
12,975 (21.1)
< 0.001
Peripheral vascular disease, n (%)
898 (2.9)
1627 (4.6)
3020 (4.9)
< 0.001
Diabetes, n (%)
3939 (12.9)
5422 (15.4)
9460 (15.4)
< 0.001
Chronic kidney disease, n (%)
688 (2.3)
1495 (4.2)
4318 (7.0)
< 0.001
COPD, n (%)
3019 (9.9)
4216 (11.9)
7398 (12.0)
< 0.001
Connective tissue disease, n (%)
1353 (4.4)
1795 (5.1)
3012 (4.9)
< 0.001
Liver disease, n (%)
424 (1.4)
479 (1.4)
408 (0.7)
< 0.001
Local cancer, n (%)
0 (0.0)
3518 (10.0)
10,287 (16.7)
< 0.001
Metastatic cancer, n (%)
0 (0.0)
873 (2.5)
1,928 (3.1)
< 0.001
Non-frail, pre-frail, and frail are defined as OFS 0, OFS 1, and OFS ≥ 2
ASA American Society of Anesthesiologists, OFS Orthopedic Hip Frailty Score, COPD chronic obstructive pulmonary disease
×
Crude all-cause mortality was also several times higher among pre-frail and frail patients at 30 days (4.2% and 12.1% vs 1.2%, p < 0.001) and 90 days (8.1% and 20.8% vs 2.5%) postoperatively, compared to non-frail patients. Across both time points, the primary causes of mortality were cardiovascular events, respiratory events, or multiorgan failure. However, pre-frail and frail patients exhibited higher rates of all specific causes of mortality (Table 2).
Table 2
Crude mortality rates in non-frail, pre-frail, and frail hip fracture patients
Non-frail patients
(N = 30,463)
Pre-frail patients
(N = 35,312)
Frail patients
(N = 61,530)
p value
30 days mortality, n (%)
380 (1.2)
1,500 (4.2)
7427 (12.1)
< 0.001
Cardiovascular, n (%)
156 (0.5)
557 (1.6)
3099 (5.0)
< 0.001
Respiratory, n (%)
87 (0.3)
304 (0.9)
1163 (1.9)
< 0.001
Cerebrovascular, n (%)
9 (0.0)
33 (0.1)
103 (0.2)
< 0.001
Sepsis, n (%)
8 (0.0)
33 (0.1)
137 (0.2)
< 0.001
Multiorgan failure, n (%)
109 (0.4)
522 (1.5)
2636 (4.3)
< 0.001
Unknown, n (%)
11 (0.0)
51 (0.1)
289 (0.5)
< 0.001
90 days mortality, n (%)
751 (2.5)
2858 (8.1)
12,802 (20.8)
< 0.001
Cardiovascular, n (%)
289 (0.9)
977 (2.8)
5015 (8.2)
< 0.001
Respiratory, n (%)
149 (0.5)
465 (1.3)
1708 (2.8)
< 0.001
Cerebrovascular, n (%)
20 (0.1)
88 (0.2)
276 (0.4)
< 0.001
Sepsis, n (%)
18 (0.1)
101 (0.3)
295 (0.5)
< 0.001
Multiorgan failure, n (%)
242 (0.8)
1,103 (3.1)
4814 (7.8)
< 0.001
Unknown, n (%)
33 (0.1)
124 (0.4)
694 (1.1)
< 0.001
Non-frail, pre-frail, and frail are defined as OFS 0, OFS 1, and OFS ≥ 2
This pattern remained consistent after adjusting for potential confounders. Frail patients exhibited a 4 times as high risk of all-cause mortality 30 days [adj. IRR (95% CI): 3.80 (3.36–4.30), p < 0.001] and 90 days postoperatively [adj. IRR (95% CI): 3.88 (3.56–4.23), p < 0.001] as non-frail patients. Of the primary cause of 30 days mortality, frailty was associated with a tripling in the risk of cardiovascular [adj. IRR (95% CI): 3.24 (2.64–3.99), p < 0.001] and respiratory mortality [adj. IRR (95% CI): 2.60 (1.96–3.45), p < 0.001] as well as a fivefold increase in the risk of multiorgan failure [adj. IRR (95% CI): 4.99 (3.95–6.32), p < 0.001] (Table 3).
Table 3
Incident rate ratios for postoperative mortality after hip fracture surgery
Mortality cause*
30 days mortality
IRR (95% CI)
p value
90 days mortality
IRR (95% CI)
p value
All-cause
Non-frail
Reference
Reference
Pre-frail
1.90 (1.67–2.16)
< 0.001
2.05 (1.87–2.24)
< 0.001
Frail
3.80 (3.36–4.30)
< 0.001
3.88 (3.56–4.23)
< 0.001
Cardiovascular
Non-frail
Reference
Reference
Pre-frail
1.61 (1.29–2.00)
< 0.001
1.62 (1.38–1.89)
< 0.001
Frail
3.24 (2.64–3.99)
< 0.001
3.08 (2.65–3.57)
< 0.001
Respiratory
Non-frail
Reference
Reference
Pre-frail
1.69 (1.27–2.26)
< 0.001
1.68 (1.35–2.10)
< 0.001
Frail
2.60 (1.96–3.45)
< 0.001
2.54 (2.04–3.16)
< 0.001
Cerebrovascular
Non-frail
Reference
Reference
Pre-frail
2.64 (1.05–6.62)
0.038
3.72 (2.03–6.82)
< 0.001
Frail
4.75 (1.88–11.98)
0.001
6.38 (3.46–11.77)
< 0.001
Sepsis
Non-frail
Reference
Reference
Pre-frail
2.22 (0.79–6.23)
0.129
3.30 (1.73–6.32)
< 0.001
Frail
3.79 (1.38–10.42)
0.010
4.14 (2.15–7.95)
< 0.001
Multiorgan failure
Non-frail
Reference
Reference
Pre-frail
2.36 (1.85–3.01)
< 0.001
2.54 (2.17–2.99)
< 0.001
Frail
4.99 (3.95–6.32)
< 0.001
4.86 (4.16–5.68)
< 0.001
Unknown
Non-frail
Reference
Reference
Pre-frail
2.50 (1.15- 5.42)
0.020
2.16 (1.36–3.43)
0.001
Frail
6.50 (3.09–13.67)
< 0.001
5.46 (3.50–8.51)
< 0.001
IRRs are calculated using Poisson regression models with robust standard errors. Missing values were managed using multiple imputation by chained equations. All analyses were adjusted for age, sex, American Society of Anesthesiologists classification, type of fracture, type of surgery, myocardial infarction, cerebrovascular disease, peripheral vascular disease, diabetes mellitus, chronic kidney disease, chronic obstructive pulmonary disease, connective tissue disease, and liver disease
IRR incident rate ratio, CI Confidence Interval
*Non-frail, pre-frail, and frail are defined as OFS 0, OFS 1, and OFS ≥ 2
Discussion
This study is the largest to date studying the association between frailty and mortality in hip fracture patients and the first that investigates how frailty affects the risk of cause-specific mortality in hip fracture patients. As in the non-frail hip fracture population, the most common causes of mortality were attributable to cardiovascular events, respiratory events, and multiorgan failure. However, the regression analyses demonstrated that pre-frailty was associated with an approximate doubling of the risk of all-cause and cause-specific mortality, while frailty at least tripled the risk of all-cause as well as cardiovascular, respiratory, cerebrovascular, sepsis-related, and multiorgan failure-related mortality.
The role of frailty in hip fracture patients is an important and frequently studied question within orthopedics [8‐12, 25]. In the current investigation approximately 48.3% of patients were classified as frail, which is consistent with at previous investigation by van de Ree et al.; however, the exact proportion will undoubtedly vary depending on how frailty is measured [11, 12, 25]. Several studies and systematic reviews have also reported an association between frailty and postoperative mortality in hip fracture patients [8‐12]. The results of the current analysis were consistent with the estimates found by both Kwak et al. in their recent publication based on the National Inpatient Sample [Odds Ratio (95% CI), moderate frailty: 2.94 (1.91–4.51), high frailty: 5.99 (3.79–9.47)] as well as the meta-analysis by Ma et al. [Relative Risk (95% CI), 2.85 (1.67–4.85)] [9, 12]. The specific causes of death are also reflected in previous research with cardiovascular and respiratory events being among the most common in both the current analysis and prior investigations [26, 27].
Of note, while crude rates of mortality are several times higher in frail compared to non-frail patients, the distribution of the specific causes of mortality appear to be relatively similar. In both cohorts, patients are most likely to die of cardiovascular and respiratory events as well as multiorgan failure. This raises the question if it is possible to identify a cohort among non-frail patients that do not exhibit excess mortality as a result of suffering a hip fracture. According to 2018 data from Statistics Sweden, the Swedish Government agency responsible for producing official statistics, the 30-day mortality rate for citizens (calculated as the 1-year mortality rate multiplied by \(\frac{30}{365}\)) was between 0.1 and 0.2% for those between 65 and 79 years old [28]. Despite 50% of non-frail patients being within this range, the whole cohort still exhibited a significantly higher 30 days mortality rate at 1.2%. This could be attributable the higher comorbidity burden compared to the general population; however, it may also be a consequence of the significant stress that is put upon the body due to the initial trauma associated with the fracture as well as the subsequent trauma caused by the surgical intervention.
Both the fracture and pursuant surgery result in an activation of the sympathetic nervous system through the release or epinephrine, norepinephrine, and cortisol. This in turn induces a hyperadrenergic state which encompasses a cascade of reactions. These include the release of proinflammatory cytokines from the immune system as well as the induction of a catabolic state mediated by several endocrinological pathways, which may negatively impact recovery and wound healing [29‐32]. If this state endures long enough, multiple organ systems may suffer additional insult, particularly the cardiovascular system [30, 31, 33‐35]. This could explain why mortality due to cardiovascular events and multiorgan failure are the most common causes of mortality and that the highest incidences of mortality are observed during the first 30 days, both in the current investigation and previous studies [36‐39].
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Owing to the large degree of heterogeneity in hip fracture patients, it is vital to tailor care based on patients’ fitness for surgery, comorbidity burden, and degree of frailty. Beta-blocker therapy, hypothesized to mitigate the hyperadrenergic response, has recently been associated with lower mortality rates in hip fracture patients [40, 41]. The association also persists in patients with dementia [42], who are by and large frail [16], and appears to be larger in patients with an elevated cardiac risk [43]. Accordingly, beta-blockade may have a particular role to play in frail hip fracture patients as well. Another potential tool is the use of orthogeriatric care models to manage this vulnerable population. While the exact structure varies between institutions, multiple systematic reviews have found that orthogeriatric care is a cost-effective measure for reducing mortality in hip fracture patients [44‐47]. Orthogeriatric care has also been associated with a lower risk of developing post-operative delirium [44], which has been strongly linked to elevated mortality and is particularly prevalent among frail patients [48, 49]. On the other hand, more traditional approaches to mitigating the postoperative mortality rate in hip fracture patients such as modifying the anesthetic and surgical technique as well as timing of surgery have failed to provide meaningful improvements in patient outcomes [50‐53]. Likely, consequential progress will necessitate modifying the entire clinical care pathway for hip fracture patients [54]. However, it may also be worth considering if surgical management always is the optimal strategy, particularly in the most frail patients with a limited life expectancy [55].
This study consists of a national cohort of consecutively registered patients from the Swedish National Quality Registry for Hip Fracture Patients. This database is contributed to by the majority of orthopedic departments in Sweden with a high case coverage [56]. With the goal of contributing to equal and high quality care for hip fracture patients across the nation, Rikshoft serves as base for many hospitals’ quality assurance programs [22]. The merging of this dataset with the Swedish National Board of Health and Welfare Patient and Cause of Death registers allowed for a range of potential confounders to adjusted for in the analysis and helped avoid any loss to follow-up. Nevertheless, as this is a retrospective cohort study, there are limitations that bear mentioning. As this is a national cohort, the risk of selection bias is mitigated, yet the risk of residual confounding remains owing to unobserved or unknown variables. For example, data pertaining to anesthesia and all medications administered were not available in the current dataset. Furthermore, in order to ease the interpretation of the results and mirror clinical practice, patients were categorized as non-frail, pre-frail, and frail according to their OFS. However, in reality frailty exists on a spectrum with varying degrees of physical, cognitive, and psychosocial impairment [57, 58]. The risk of human errors when registering data must also be considered, particularly when recording the cause of death, which can be difficult to determine even in the best of circumstances. The probability that non-differential misclassification significantly affected the results is nonetheless low, given that the results of the current analyses are consistent with previous research. Finally, the analyses were limited to the outcomes available in the current dataset; consequently, the role frailty plays in postoperative pain, complications, and functional outcomes could not be included.
Conclusion
Frailty is associated with a significantly increased risk of all-cause and cause-specific mortality at 30 and 90 days postoperatively. Across both timepoints, cardiovascular and respiratory events along with multiorgan failure were the most prevalent causes of mortality. Future studies are required to determine how to best optimize care for this vulnerable patient population.
Declarations
Conflict of interest
The authors have no conflicts of interest to disclose.
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