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Preoperative muscle weakness as defined by handgrip strength and postoperative outcomes: a systematic review

Abstract

Background

Reduced muscle strength- commonly characterized by decreased handgrip strength compared to population norms- is associated with numerous untoward outcomes. Preoperative handgrip strength is a potentially attractive real-time, non-invasive, cheap and easy-to-perform "bedside" assessment tool. Using systematic review procedure, we investigated whether preoperative handgrip strength was associated with postoperative outcomes in adults undergoing surgery.

Methods

PRISMA and MOOSE consensus guidelines for reporting systematic reviews were followed. MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Clinical Trials (1980-2010) were systematically searched by two independent reviewers. The selection criteria were limited to include studies of preoperative handgrip strength in human adults undergoing non-emergency, cardiac and non-cardiac surgery. Study procedural quality was analysed using the Newcastle-Ottawa Quality Assessment score. The outcomes assessed were postoperative morbidity, mortality and hospital stay.

Results

Nineteen clinical studies (17 prospective; 4 in urgent surgery) comprising 2194 patients were identified between1980-2010. Impaired handgrip strength and postoperative morbidity were defined inconsistently between studies. Only 2 studies explicitly ensured investigators collecting postoperative outcomes data were blinded to preoperative handgrip strength test results. The heterogeneity of study design used and the diversity of surgical procedures precluded formal meta-analysis. Despite the moderate quality of these observational studies, lower handgrip strength was associated with increased morbidity (n = 10 studies), mortality (n = 2/5 studies) and length of hospital stay (n = 3/7 studies).

Conclusions

Impaired preoperative handgrip strength may be associated with poorer postoperative outcomes, but further work exploring its predictive power is warranted using prospectively acquired, objectively defined measures of postoperative morbidity.

Peer Review reports

Background

A substantial minority of patients sustain an excess of postoperative complications [1] and accelerated, post-hospital discharge mortality [2]. In surgical procedures known to have a mortality of greater than 5% in the UK, elderly patients (mean age 75 years) and emergency procedures account for over 80% of deaths but less than 15% of total procedures [3]. Physician- and patient-friendly, practical and inexpensive tools are required to guide and risk-stratify perioperative management objectively for this cohort of patients. Measurements of exercise capacity and muscle strength are associated with increased all-cause and cardiovascular mortality in the general population [47]. However, the comprehensive assessment of cardiovascular reserve - most objectively using cardiopulmonary exercise testing [8] - is challenging for immobile patients, time-consuming, and costly to extend as a general screening tool to the wider, at-risk surgical population. By contrast handgrip strength is an inexpensive, objective bedside test which has established population norms [913] and has been extensively tested in a range of chronic general medical conditions [14]. It may reflect, in part, the association of impaired muscle strength with malnutrition [15] and cardiopulmonary or metabolic diseases [47]. Hand grip strength can be assessed by instructing the patient to keep their shoulders adducted and neutrally rotated, the arm in a vertical position, the wrist in a neutral position and to squeeze the grip with maximal strength. The highest result in a seated or semi-seated position may be used [16, 17]. Whether a robust relationship between preoperative handgrip strength and postoperative outcomes exists is unclear, since variable, and frequently retrospective, definitions of postoperative morbidity have been employed as outcome measures [18]. Therefore, we performed a systematic review of the literature to ascertain if preoperative assessment of handgrip strength is associated with (i) postoperative morbidity, (ii) length of hospital stay.

Methods

The systematic review was undertaken in accordance with the PRISMA [19] (Preferred Reporting Items for Systematic reviews and Meta-Analyses) and MOOSE (Meta-analysis of Observational Studies in Epidemiology) [20] guidelines. Figure 1 summarizes the flow of information through the different phases of this systematic review. A checklist demonstrating adherence to the PRISMA guidelines is available online (Additional File 1).

Figure 1
figure1

Flow diagram showing systematic review synthesis, in accordance with PRISMA guidelines.

Two of the authors (P.S. and M.A.H.) searched the electronic databases MEDLINE, EMBASE, and the Cochrane Central Register of Controlled Clinical Trials independently using the following population search terms: 'postoperative complications' OR 'perioperative complications' OR 'surgical complications' OR 'surgical outcome'. These search results were combined with 'handgrip dynamometry' OR 'hand grip dynamometry' OR 'hand grip strength' OR 'handgrip strength' OR 'maximal voluntary contraction' in the title or abstract text using the Boolean search operator 'AND'. (Maximal voluntary contraction is the term used most commonly in the literature to describe maximal force produced by a muscle as it contracts while contracting against the hand dynamometer). The references of retrieved articles were hand searched for any relevant articles not identified in the original search. The study selection criteria were limited to include only studies reported in the English language and those involving human adults undergoing surgery (including cardiac and transplant surgery). Each abstract was screened to identify studies that had assessed handgrip strength prior to surgery. Studies were excluded if postoperative outcomes focussed on upper limb neuromuscular functional outcomes alone.

The data were extracted on to a standardized data entry form by each reviewer. Differences between the reviewers were resolved by re-examination of the original manuscript until consensus was obtained. Data extracted for comparison included year of publication, primary author, total number of subjects, mean patient age, proportion of male subjects and co-morbidity (where reported). The method of quantifying or qualifying handgrip strength was recorded.

The specific outcomes sought in each article were: (i) mortality, (ii) postoperative morbidity, categorized according to the Post Operative Morbidity Survey, (iii) length of hospital stay [21]. Primary and/or secondary outcomes were recorded according to the a priori intention of each original article. Each outcome was evaluated qualitatively according to either qualitative and/or quantitative assessment of handgrip strength. Because there were a limited number of studies with homogenous design for each outcome, a meta-analysis could not be performed.

The procedural quality of each trial was assessed using several criteria, although no studies were excluded on the basis of these assessments. The quality of studies was scored according to the Newcastle-Ottawa Quality Assessment Scale [22] (Additional File 2), on a scale from 1 (poor) to 8 (excellent), which includes patient follow-up rates as a marker of study quality. Disagreements about the eligibility of a study or differences between the two sets of information extracted were resolved through discussion between all authors. After abstraction of information, a level of evidence was assigned to the outcomes of each study. Two authors (P.S. and M.A.H.) independently reviewed and scored each study using this method.

Results

Nineteen studies were identified that compared postoperative outcomes in relation to handgrip strength (Table 1), comprising 2194 patients [913, 16, 17, 2334]. A wide range of surgical sub-specialties was explored. Four studies were conducted in patients undergoing urgent surgery for hip fractures. One study explored the effect of pre-operative nutritional supplementation on grip strength [25]. Although supplementation improved post-operative grip strength compared to the control group, it was not related to patient outcome. Only two studies ensured that investigators who evaluated postoperative morbidity also remained blinded to the pre-operative grip strength values [10, 17]. A wide range of exclusion criteria were reported between studies. One-third of studies reported the patient drop-out rate.

Table 1 Basic demographics, defined primary/secondary outcomes and handgrip site used for patient studies.

The majority of studies measured handgrip strength pre-operatively (Table 2). Eleven studies did not comment on how long before surgery the handgrip strength was measured [9, 10, 17, 24, 25, 28, 3033]. Guo et al did not comment on whether handgrip strength was measured pre or post-surgery [11]. Very few studies achieved a quality assessment score less than 6, consistent with moderate quality (Table 3, Additional File 1).

Table 2 Timing of handgrip measurements in patient studies.
Table 3 Newcastle -Ottawa Quality Assessment Scores (NOS score).

Definition of impaired handgrip strength

Variable definitions for impaired handgrip strength have been used across studies (Table 4). Studies compared values of grip strength obtained from healthy controls, reference populations or patients who did not sustain postoperative morbidity with surgical patients. For example, 9 studies defined impaired handgrip strength as < 85% of a general, age-matched population - but these reference populations were not common between studies. Table 1 demonstrates that six studies measured handgrip strength exclusively from the non-dominant hand, compared to 3 studies that measured handgrip strength in the dominant hand. Seven studies did not report which hand was tested. 11/19 studies did not report the timespan over which handgrip strength measurements preceded surgery. Variable time points were used between studies to assess postoperative handgrip strength. Detailed protocols for the performance of handgrip strength were absent in the majority of studies.

Table 4 Definitions used for impaired handgrip Strength.

Postoperative morbidity

Table 5 summarizes the 15 studies that detailed the relationship between handgrip strength and various aspects of postoperative morbidity. Ten out of these 15 studies described a significant relationship between lower handgrip strength and postoperative morbidity [9, 10, 12, 13, 25, 28, 3033]. No studies defined postoperative morbidity using validated morbidity tools. A range of morbidities were recorded prospectively: very few studies defined in detail how these morbidities were determined. Five studies used length of hospital stay as a surrogate for postoperative complications, but did not describe the associated morbidities.

Table 5 Type of Postoperative morbidity included in follow-up of patients.

Length of Hospital Stay

Tables 5 and 6 show the 12 studies which utilised length of stay as an outcome measure for postoperative morbidity. Five of these studies incorporated length of hospital stay into their definition of "complications" [9, 28, 30, 32, 33] and 7 studies separately explored the relationship between handgrip strength and length of hospital stay [10, 11, 13, 17, 24, 25, 27]. Three of these 7 studies reported an association between lower handgrip strength and prolonged length of stay [10, 13, 25]. Mean or median values were compared rather than log-rank analysis.

Table 6 Studies describing relationship between Grip Strength (GS) and Hospital Length of Stay (LOS).

Mortality

Table 7 summarizes the 5 studies that explored the relationship between handgrip strength and postoperative mortality. Variable time points for postoperative associated death were defined across studies, ranging from 30 days to 6 month mortality following surgery. One study did not define the time period of follow-up for patients to determine mortality. Two studies reported an association between lower handgrip strength and increased mortality [12, 17].

Table 7 Studies describing relationship between handgrip strength and postoperative mortality.

Discussion

Contrary to large population studies, our systematic review of the relationship between preoperative handgrip strength and postoperative outcome did not find compelling data to support the hypothesis that the results of studies in the general population translate to perioperative medicine. The majority of studies were considered to be of reasonable quality. Despite these quality scores, many studies contained important potential confounding factors which varied markedly between studies. A range of different instruments have been employed to measure grip strength, with other corroborative assessments of strength being frequently absent. Due to the substantial variation in the way in which each specified outcome had been defined between studies, plus the lack of analyses testing any one particular association, it was not possible to perform meta-analyses of results or formally test the heterogeneity (consistency) between studies. This marked heterogeneity between studies limits any definitive conclusions for the perioperative environment and renders this preoperative assessment largely unexplored. Nevertheless, several of these studies - albeit with the limitations as discussed above - suggest the role for preoperative handgrip strength assessment should be explored further.

Large epidemiological studies have shown that perioperative morbidity is associated with dramatic differences in post-discharge life expectancy across different operations and health systems [2]. The cost and expertise required by certain preoperative tests, such as cardiopulmonary exercise testing, plus other limiting factors (e.g. dysmobility, acuity of surgery) necessitates an alternative approach to be developed for the objective assessment of perioperative risk in the substantial minority of patients who may sustain morbidity that impacts on their longer-term survival. The development of an inexpensive, mass screening preoperative assessment tool with high sensitivity and specificity to detect postoperative morbidity is clearly attractive. Handgrip strength is an easy, non-invasive, cheap, real-time and established independent "bedside" predictor of long-term all-cause mortality in more than 44,000 patients studied in the general population [14].

There are also compelling basic biological reasons for establishing the role of handgrip strength in preoperative assessment. Cardiopulmonary reserve is a long-established predictor of cardiovascular and all-cause mortality, in both asymptomatic individuals and patients with cardiovascular disease [35]. Cardiac insufficiency has emerged as the commonest preoperative morbidity associated with increased morbidity and mortality [36, 37]. An important component of cardiac failure is dysfunctional skeletal muscle metabolism [38] and impaired strength - as reflected by handgrip strength [39]. Skeletal muscle exerts important effects on the patterns of substrate use during periods of increased cardiopulmonary performance [40, 41]. Major alterations in skeletal muscle histology and biochemistry occur in patients with long-term heart failure [42, 43]. These skeletal muscle adaptations may underlie the early onset of anaerobic metabolism, increased lactate production and fatigue in heart failure. Handgrip strength improves following specific interventions that increase cardiopulmonary reserve [44, 45]. Muscle (handgrip) strength is also impaired in metabolic disease [46], which may in part explain its association with both poorer perioperative outcomes and all-cause mortality.

One limitation of this systematic review is that no original study data were retrieved, although given the heterogeneity of both study design and the surgical populations in question this would have been unlikely to alter the main conclusions. Because only published reports were examined (obtained from searches performed only on MEDLINE, EMBASE and Cochrane databases), a formal assessment of publication bias was not undertaken. It remains possible that not all relevant studies may have been identified since unpublished studies were not sought. There is very little perioperative demographic data provided in these studies, including cardiovascular risk and the identification of higher risk patients. Standards of postoperative care were not reported or apparently standardized. Since no interventions were conducted based on preoperative handgrip strength assessment, the studies only provide associative conclusions.

This systematic review has generated two significant clinical implications. Firstly, given the compelling general population data that predicts longevity, there is clearly a need for the further prospective assessment of whether preoperative handgrip strength can help stratify risk of adverse postoperative outcomes. Second, these studies demonstrate that handgrip strength is a feasible, pragmatic, real-time bedside tool that may enhance preoperative risk stratification.

Conclusions

Impaired preoperative handgrip strength may be associated with increased postoperative morbidity, mortality and prolonged hospital stay following surgery. Given the robust predictive power of this inexpensive, objective bedside test beyond the perioperative population, further studies of its' role in predicting postoperative outcomes appear to be warranted provided prospective, objectively defined measures of morbidity are employed.

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Acknowledgments and funding

Centre for Anaesthesia, Critical Care and Pain Management, University College London, UK [PS, MAH]; Academy of Medical Sciences/Health Foundation Clinician Scientist award [GLA]. This work was undertaken at UCLH/UCL who received a proportion of funding from the Department of Health's NIHR Biomedical Research Centres funding scheme.

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Sultan, P., Hamilton, M.A. & Ackland, G.L. Preoperative muscle weakness as defined by handgrip strength and postoperative outcomes: a systematic review. BMC Anesthesiol 12, 1 (2012). https://doi.org/10.1186/1471-2253-12-1

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Keywords

  • Maximal Voluntary Contraction
  • Grip Strength
  • Postoperative Outcome
  • Postoperative Morbidity
  • Handgrip Strength
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