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Original paper

The Surgical Apgar score and frailty as outcome predictors in short- and long-term evaluation of fit and frail older patients undergoing elective laparoscopic cholecystectomy – a prospective cohort study

Kinga Mastalerz, Jakub Kenig, Urszula Olszewska, Cyprian Michalik

Videosurgery Miniinv 2018; 13 (3): 350–357
Online publish date: 2018/05/21
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Introduction

Elective laparoscopic cholecystectomy is a safe and effective treatment method in fit older patients, achieving outcomes comparable with their younger counterparts [1]. However, older patients are very heterogeneous with regard to physical reserve and co-morbidity. Particularly, this concerns frail older patients who have increased vulnerability and loss of adaptive capacity to external stressors (including surgery), which results in an increased risk of adverse outcomes [2]. In our previous study, we demonstrated that emergency surgery in this group of older patients is associated with poor outcomes and an elective surgery in experienced hands could be a safe option for frail patients [3].
We hypothesize that the body’s reaction to the surgical injury could be the key element in this group of patients. Thus, there is a great need to evaluate not only the preoperative health status, but also the surgical intervention itself. The Surgical Apgar Score (SAS), proposed by Gawande et al., is a simple and rapid scoring system, using only three elements extracted from anaesthesia records (estimated blood loss, lowest intraoperative heart rate and lowest intraoperative mean arterial pressure) [4]. It was validated in a large cohort of general surgical patients, and also by our team, in older patients undergoing emergency surgery [5, 6]. However, it remains unknown whether the SAS might be useful in older fit and frail patients undergoing elective cholecystectomy, which is one of the most common surgical procedures in the older population.

Aim

Therefore, the aim of this study was to evaluate the usefulness of the SAS in predicting 30-day morbidity and 1-year mortality in older fit and frail patients undergoing elective laparoscopic cholecystectomy.

Material and methods

Study population

Between January 2013 and December 2016, consecutive patients, aged 70 years and older, who were in need of elective laparoscopic cholecystectomy were included in the prospective study. The Ethics Committee approved this study and informed consent was obtained from all patients or their caregivers. Patients who had open cholecystectomy or gallbladder cancer in the final pathological report were excluded.

Study protocol

All patients had the CGA, which was performed between 1 and 7 days before hospital admission (in most cases, on the day of admission) by trained physicians of the geriatric team. The CGA included instruments evaluating four cardinal domains of geriatric assessment:
• Functional status: activities of daily living (ADL; cut-off score < 5) [7] and Instrumental Activities of Daily Living (IADL; cut-off score ≤ 7) [8].
• Psychological status: the Blessed Orientation-Memory-Concentration (BOMC; cut-off score > 10) test [9], the Clock Drawing Test (CDT; cut-off score > 3) [10], the Geriatric Depression Scale (GDS) [11].
• Physical health: Comorbidities: the Charlson Comorbidity Index (CCS) [12], the full version of mini nutritional assessment (MNA; cut-off score < 24) [13], polypharmacy assessment (cut-off score > 7 medications/day) [14], the Timed Up and Go (TUG) [15].
• Social factors: Medical Outcomes Study Social Support Scale (MOS-SSS; cut-off score < 4) [16].
Each test was scored on a dichotomous scale, based on whether there was or was not an impairment in any of the parameters.
Additionally, variables related to demographics (age at the time of surgery, gender), indications for surgery, baseline preoperative clinical/laboratory data (body mass index (BMI), the American Society of Anesthesiologists (ASA) score [17], haemoglobin, creatinine and albumin serum level), and intraoperative parameters (type and length of surgery, estimated blood loss, lowest intraoperative heart rate and lowest intraoperative mean arterial pressure) were also recorded.

Frailty definition and its model

The cumulative deficit model of frailty was used. The equally weighted deficits, as a measure of accumulated vulnerability, were recorded in the database. The ADL/IADL and the BOMC/CDT were considered abnormal if one of the assessment tools showed literature-based impairment. Deficits in two or more Geriatric Assessment (GA) domains indicated an increased risk of postoperative complications, disability or death; this was used as the cut-off score for the GA set and also as our frailty definition.

The Surgical Apgar Score

The SAS was calculated at the end of surgery from anaesthesiology records, including estimated blood loss (EBL), lowest intraoperative heart rate (HR) and lowest intraoperative mean arterial pressure (MAP). As shown in Table I, the score is the sum of the points from each category.

Outcome measure

The primary end points were analyses of the occurrence of complications within 30 days, death within 30 days and 12 months follow-up after surgery. Complications were defined as any event occurring within 30 days of surgery that requires treatment not routinely applied in the post-operative period. The predefined complications were documented prospectively, allowing the complete accrual of data. The severity of complications was classified according to the Clavien-Dindo scale [18]. In the case of a complications requiring many treatment methods, the highest severity grade was recorded. Post-operative mortality was defined as death within 30 days after surgery. Additionally, the mortality was reassessed at 90, 180 days and 1 year. The follow-up consisted of an outpatient visit and a phone encounter.

Statistical analysis

The data were analysed using Statistica 12.0 software (Dell). There were no missing data. Categorical variables were described as numbers (percentages), while continuous variables were reported as median and range. Pearson’s 2 or Fisher’s exact test was used to compare categorical variables where appropriate. The Shapiro-Wilk and the Kolmogorov-Smirnov tests, with the Lilliefors correction, were used to confirm the normality of the distribution of the continuous variables and the unpaired Student’s t test or the nonparametric Mann-Whitney U test was used for comparisons where appropriate.
A univariate analysis was conducted investigating the association between various pre- and intraoperative operative variables with 30-day postoperative morbidity, 30-day and 12-month postoperative mortality. A multivariate analysis was conducted to identify which of the mentioned factors best described the occurrence of postoperative outcomes. The entry criteria for the model were set at p = 0.1 in the univariate analysis and the forward stepwise logistic regression was used for those factors. Collinearity among variables was detected by means of the Spearman correlation test. Receiver operating characteristics (ROC) and the area under the curve (AUC) were used to evaluate the diagnostic performance and predictive ability of the screening tests to detect postoperative outcomes. A statistical comparison of different tests was carried out as described by Hanley and Hajin-Tilaki [19]. Statistical significance was defined as a two-sided p ≤ 0.05.

Results

Study protocol

In the inclusion period, 161 patients were scheduled for elective laparoscopic cholecystectomy due to symptomatic gallbladder stones or polyps. Fifteen patients were excluded preoperatively: 1 patient refused to participate in the study and 14 were scheduled for an open cholecystectomy. Three patients were excluded in the postoperative period due to gallbladder cancer diagnosis in the final pathological report. A total of 144 of these patients were included in the study, among whom 142 were available for analyses at 12 months. Two patients were lost to follow-up; they did not answer any phone calls or email (Figure 1).
Consultants or residents under the direct supervision of a consultant (who also served as the first assistant) performed all the operations. Laparoscopic cholecystectomy was performed using a standard three- or four-port technique.

Baseline characteristics

The study sample comprised 144 consecutive patients (95 female (66%), 49 male) with a median age of 76 (range: 70–91). Eighty-nine (61.8%) patients were at the age 70–79 years, 52 (36.1%) were 80–89 years and 3 (2.1%) were 90 years old or older. Fifty-one (35.4%) patients were assessed as having an ASA score > 2 (Table II).
The most common indications for surgery were: symptomatic gallbladder stones (105 patients), which comprised over 72.9% of the cases, followed by a gallbladder polyp (39 patients; 26.1%).

Descriptive analysis of GA components

The detailed results of GA instruments are listed in Table III. Each of the validated assessment tools is presented with literature-based cut-off scores, together with the proportion of patients who had abnormal results in the test.
Sixteen patients were recognised as functionally dependent using ADL and I-ADL. Another 10% had an abnormal time when performing the TUG. Almost 19% of the study population had some degree of malnutrition at the hospital admission. Only 8 (5.5%) patients had no comorbidity and 21 (14.6%) had one concomitant disease. Using the Geriatric Depression Scale, 20 (13.9%) patients met the criteria for depression. Prior to the GA, only 9 patients had such a diagnosis. An even bigger difference was observed in the case of cognitive tests. The BOMC/CDT was impaired for a total of 23.6% of patients. Prior to their submission, this was known in only 10 (6.9%) patients. The median number of drugs taken by the patient was 4 (range: 0–16).

Frailty frequency

The prevalence of frailty was 44.4% (64 patients), as determined by the cumulative deficit model with cut-off at the level of two or more abnormal GA domains. There was no statistically significant difference between the number of frail female and male patients: 39 (41%) vs. 25 (51%); p > 0.05.

Early outcome

The 30-day mortality was 0%. Thirty-day morbidity occurred in 17 (11.8%) patients, including 9 (6.3%) patients with major complications, grade 3–4 according to the Clavien-Dindo classification (Table IV). Conversion was necessary in 12 (8.3%) patients, mostly due to chronic inflammation, gallbladder-colon fistula, and 1 case of intraoperative bleeding. Five patients had to be reoperated on due to postoperative complications (3.5%). The median length of postoperative stay was 2 (1–38) days.

Follow-up outcome

Of the 142 patients available for analysis after 12 months, 9 (6.3%) patients died, 127 (89.4%) lived in their own home, and 6 (4.3%) lived in a nursing home. Seven deaths occurred in the frail patients (3 in the first 3 months, another 2 between the 3rd and 6th month and 2 between the 6th and 12th postoperative months). Two deaths occurred in the fit patients, in the 4th and 7th postoperative month.

The SAS score

Analysing the intraoperative variables, the median lowest heart rate was 50 (range: 25–90) beats/min, the median lowest arterial pressure was 60 (range: 36–98) mm Hg and the median estimated blood loss was 50 (range: 0–850) ml. The median operative duration was 79 (range: 30–190) min. None of the above variables alone was identified as a risk factor of 30-day morbidity in the regression analysis.
Table V presents the results of bivariate 2 tests between the SAS score and postoperative 30-day morbidity among fit and frail patients. Patients scoring 7–10 and < 7 points had 30-day morbidity rates of 3% vs. 8% (p = 0.2), and 50% and 35.7% (p < 0.5) in fit and frail older patients, respectively.
The lower part of Table V shows 30-day combined morbidity. The older patients with the SAS < 7 had significantly more complications than those with the SAS of 7 or more points. The difference was even more significant if surgical complications (biliary fistula, postoperative bleeding, abdominal abscess) were excluded from the comparison.
In the case of 1-year mortality, the difference between the fit and the frail patients was significant (p < 0.05); 7 out of 9 deaths occurred in the frail group. Three patient with the SAS score < 7 points (18.8%) and 6 (5.1%) patients with the SAS ≥ 7 points died in the follow-up (Table VI).

Risk factors of 30-day postoperative outcome

The SAS turned out to be a predictive factor of 30-day postoperative morbidity in a univariate regression analysis. In turn, age ≥ 85 and frailty were predictors of 1-year mortality. The detailed results of univariate logistic regression are shown in Table VII.
Multivariate analyses (adjusted by age, gender, BMI, albumin serum level and length of surgery, frailty, ASA > 2) have identified only the SAS score as an independent factor that predicts 30-day postoperative complications (OR = 5.1; 95% CI: 1.5–18.1). In the case of 1-year mortality only age ≥ 85 years (OR = 1.9; 95% CI: 1.2–16.4) and frailty (3.4; 95% CI: 1.1–19.3) were independent predictors. The SAS turned to be an insignificant predictive factor of 1-year mortality (p < 0.15).

Diagnostic accuracy

Table VIII summarizes the sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV) and the AUC, in the ROC plot, of the SAS < 7 points. In the case of 30-day morbidity, the AUC of the SAS was 0.71, suggesting that it has reasonable discrimination. The other statistics such as sensitivity, specificity, PPV and NPV were 50%, 84%, 29% and 93%, respectively.

Calibration of prediction scores:

The fit of the model was good in all cases, as shown by the Hosmer and Lemeshow test (p > 0.05).

Discussion

The present study demonstrates that elective laparoscopic cholecystectomy can be safely performed in older fit and frail patients with no 30-day mortality and acceptable short postoperative morbidity. There was no difference in morbidity between the fit and the frail older patients. The SAS was the only independent predictor of 30-day morbidity, which makes it a potential target for further care improvement. The chronological age and the ASA score were not found to be predictive of morbidity. However, frailty and age > 85 years were predictors of 1-year mortality.
There is no doubt that chronological age alone is a poor descriptor of preoperative health status due to the great heterogeneity in the older population [20]. Therefore, the CGA is recommended in the preoperative evaluation of older patients, identifying up to 40% of new age-related problems that were not routinely detected in a standard history and physical examination. It also allows for the risk stratification and leads to a better estimation of residual life expectancy [20]. This is also clearly visible in our study, where frailty, assessed on the basis of CGA, was the predictor of 1-year mortality. In practice, this can be used for better preoperative selection of patients in terms of a long postoperative period. At present, there are many tools to evaluate frailty, including screening instruments. However, they still need further research and the CGA is the key element of modern geriatric care.
In our case series, there was no difference in postoperative morbidity between frail and fit patients, which implies that, as opposed to open surgery, laparoscopic cholecystectomy can, to some extent, “compensate” the perioperative risk associated with frailty. Additionally, in the case of moderate risk surgical procedures, such as cholecystectomy, the injury is too small to break the homeostasis, even in frail patients. Thus, in open surgery there is a clear correlation between frailty and morbidity, including high-risk operations such as colon resection [21]. The frail patients had higher morbidity, which was significantly smaller if they were operated on laparoscopically. In our study, the conversion rate was low, which makes a detailed evaluation difficult. However, it was correlated with an increase in postoperative morbidity although in all cases (apart from one) it was a conscious decision and not forced by intraoperative complications. On the other hand, only 35% of frail patients in our case series had more than 4 impaired domains, which could be equivalent to “severe frailty”. Therefore, to evaluate the influence of frailty further, it would be useful to include only patients from this subpopulation in the analysis.
It seems that the influence of the surgical injury is a critical element in laparoscopic cholecystectomy [22]. In our case series, only the SAS turned to be an independent risk factor. Our results are consistent with those obtained by other authors and summarized in the review on the SAS by Nair et al. published in 2017 [5]. Twenty out of 25 retrospective and 9 out of 11 prospective studies confirmed that the SAS correlated with postoperative morbidity and mortality. The cut-offs were different between the studies but most of the authors used 6/7 points to differentiate between low- and high-risk patients [5]. However, to the best of our knowledge, this is the first study reporting on the SAS in frail older patients. Similarly, we observed that the SAS was a good predictor of postoperative morbidity and mortality in older patients undergoing an emergency surgery [6, 23]. There were also reports showing that the SAS had no correlation with the outcome: in orthopaedic procedures (mainly carried out under spinal anaesthesia) [24], in the microvascular head and neck reconstruction [25], but also in hysterectomy [26], oesophagectomy [27] and gastrectomy [28].
Moreover, none of the SAS components alone turned to be significant; only a combination of them did. A further target of improvement could be the patients with the SAS < 7. This allows identification of high risk patients who can be followed meticulously to decrease the “failure to rescue” rate as much as possible.
There are also some limitations to our study. This was a single institution analysis in which several surgeons (including residents) performed the operations. However, only consultants operated on all patients with postoperative surgical complications due to their complexity. There was also inherent variability in the value of estimated blood loss (measurements dictated by the surgeon performing the operation). Moreover, only patients referred to our outpatient clinic were included in the study, which is not an accurate picture of the older population. Despite these limitations, this is the first reported study to prospectively assess the efficacy of the SAS for older frail patients undergoing laparoscopic cholecystectomy. Another significant strength is that we used the Comprehensive Geriatric Assessment to diagnose frailty, and not screening tests.

Conclusions

Laparoscopic cholecystectomy can be safely performed in older fit and frail patients with no mortality, acceptably short postoperative morbidity and low 1-year mortality. The SAS, not age and not the ASA score, turned out to be the most important predictor of 30-day morbidity. This implies that the course of surgery is a critical element in the treatment of older patients undergoing laparoscopic cholecystectomy. Older patients with the SAS < 7 points should be followed meticulously in order to diagnose and treat potential complications early on.

Conflict of interest

The authors declare no conflict of interest.

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Received: 21.02.2018, accepted: 14.04.2018.
Copyright: © 2018 Fundacja Videochirurgii This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License (http://creativecommons.org/licenses/by-nc-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited and states its license.
  
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