Abbott TEF; William Harvey Research Institute, Queen Mary University of London, London, UK; Barts Health NHS Trust, London, UK. Electronic address: t.abbott@qmul.ac.uk.
Gooneratne M; Barts Health NHS Trust, London, UK.
McNeill J; Barts Health NHS Trust, London, UK.
Lee A; William Harvey Research Institute, Queen Mary University of London, London, UK.
Levett DZH; Critical Care Research Group, Southampton NIHR Biomedical Research Centre, University Hospital Southampton-University of Southampton, Southampton, UK.
Grocott MPW; Critical Care Research Group, Southampton NIHR Biomedical Research Centre, University Hospital Southampton-University of Southampton, Southampton, UK.
Swart M; South Devon Healthcare NHS Trust, Torbay, UK.
MacDonald N; Barts Health NHS Trust, London, UK.

British Journal Of Anaesthesia [Br J Anaesth] 2018 Mar; Vol. 120 (3), pp. 475-483. Date of Electronic Publication: 2017 Nov 29.

Background: Despite the increasing importance of cardiopulmonary exercise testing (CPET) for preoperative risk assessment, the reliability of CPET interpretation is unclear. We aimed to assess inter-observer reliability of preoperative CPET.
Methods: We conducted a prospective, multi-centre, observational study of preoperative CPET interpretation. Participants were professionals with previous experience or training in CPET, assessed by a standardized questionnaire. Each participant interpreted 100 tests using standardized software. The CPET variables of interest were oxygen consumption at the anaerobic threshold (AT) and peak oxygen consumption (VO2 peak). Inter-observer reliability was measured using intra-class correlation coefficient (ICC) with a random effects model. Results are presented as ICC with 95% confidence interval, where ICC of 1 represents perfect agreement and ICC of 0 represents no agreement.
Results: Participants included 8/28 (28.6%) clinical physiologists, 10 (35.7%) junior doctors, and 10 (35.7%) consultant doctors. The median previous experience was 140 (inter-quartile range 55-700) CPETs. After excluding the first 10 tests (acclimatization) for each participant and missing data, the primary analysis of AT and VO2 peak included 2125 and 2414 tests, respectively. Inter-observer agreement for numerical values of AT [ICC 0.83 (0.75-0.90)] and VO2 peak [ICC 0.88 (0.84-0.92)] was good. In a post hoc analysis, inter-observer agreement for identification of the presence of a reportable AT was excellent [ICC 0.93 (0.91-0.95)] and a reportable VO2 peak was moderate [0.73 (0.64-0.80)].
Conclusions: Inter-observer reliability of interpretation of numerical values of two commonly used CPET variables was good (>80%). However, inter-observer agreement regarding the presence of a reportable value was less consistent.

Biccard BM; Department of Anaesthesia and Perioperative Medicine, University of Cape Town and New Groote Schuur Hospital,

British Journal Of Anaesthesia [Br J Anaesth] 2018 Mar; Vol. 120 (3), pp. 419-421. Date of Electronic Publication: 2018 Feb 01.

No abstract available

Colwell KL(1), Bhatia R

Med Sci Sports Exerc. 2017 Oct;49(10):1987-1992.

INTRODUCTION: Maximum voluntary ventilation (MVV), a surrogate marker of maximum
ventilatory capacity, allows for measuring ventilatory reserve during
cardiopulmonary exercise testing (CPET), which is necessary to assess ventilatory
limitation. MVV can be measured directly during a patient maneuver or indirectly
by calculating from forced expiratory volume in 1 s (FEV1 × 40). We investigated
for a potential difference between calculated MVV and measured MVV in pediatric
subjects, and which better represents maximum ventilatory capacity during CPET.

METHODS: Data were collected retrospectively from CPET conducted in pediatric
subjects for exercise-induced dyspnea from January 2014 to June 2015 at Akron
Children’s Hospital. Subjects with neuromuscular weakness, morbid obesity, and
suboptimal effort during the testing were excluded from the study.

RESULTS: Thirty-five subjects (mean ± SD, age = 13.8 ± 2.7 yr, range = 7-18 yr)
fulfilled the criteria. Measured MVV was significantly lower than calculated MVV
(89.9 ± 26.4 vs 122.4 ± 34.5 L·min; P < 0.01). The ventilatory reserve based on
measured MVV was also significantly lower than ventilatory reserve based on
calculated MVV (12.4% ± 19.6% vs 36.1% ± 13.2%; P < 0.01). Calculated MVV (as
well as ventilatory reserve based on calculated MVV) was significantly correlated
with ventilatory parameters. By contrast, no significant correlations were found
between measured MVV (or ventilatory reserve based on measured MVV) and
ventilatory parameters except for peak ventilation (peak V˙E).

CONCLUSIONS: The measured MVV was significantly lower than the calculated MVV in
our pediatric subjects. The calculated MVV was a better surrogate of maximum
ventilatory capacity as shown by significant correlation to other ventilatory
parameters during CPET.

Tomlinson OW, Barker AR, Oades PJ, Williams CA

Med Sci Sports Exerc. 2017 Oct;49(10):1980-1986.

PURPOSE: The aim of this study was to describe the relationship between body size
and oxygen uptake efficiency slope (OUES) in pediatric patients with cystic
fibrosis (CF) and healthy controls (CON), to identify appropriate scaling
procedures to adjust the influence of body size upon OUES.
METHODS: The OUES was derived using maximal and submaximal points from
cardiopulmonary exercise testing in 72 children (36 CF and 36 CON). OUES was
subsequently scaled for stature, body mass (BM), and body surface area (BSA)
using ratio-standard (Y/X) and allometric (Y/X) methods. Pearson’s correlation
coefficients were used to determine the relationship between body size and OUES.
RESULTS: When scaled using the ratio-standard method, OUES had a significant
positive relationship with stature (r = 0.54, P < 0.001) and BSA (r = 0.25, P =
0.031) and significant negative relationship with BM (r = -0.38, P = 0.016) in
the CF group. Combined allometric exponents (b) for CF and CON were stature 3.00,
BM 0.86, and BSA 1.40. A significant negative correlation was found between OUES
and stature in the CF group when scaled allometrically (r = -0.37, P = 0.027).
Nonsignificant (P > 0.05) correlations for the whole group were found between
OUES and allometrically scaled BM (CF r = -0.25, CON, r = 0.15) and BSA (CF r =
-0.27, CON r = 0.13).
CONCLUSIONS: Only allometric scaling of either BM or BSA, and not ratio-standard
scaling, successfully eliminates the influence of body size upon OUES. Therefore,
this enables a more direct comparison of the OUES between patients with CF and
healthy controls.

Perioper Med (Lond). 2018 Jan 26;7:2. doi: 10.1186/s13741-017-0082-3. eCollection
2018.

Reeves T, Bates S, Sharp T, Richardson K,
Bali S, Plumb J, Anderson H, Prentis J, Swart,
Levett DZH; Perioperative Exercise Testing and Training Society
(POETTS).

Background: Cardiopulmonary exercise testing (CPET) is an exercise stress test
with concomitant expired gas analysis that provides an objective, non-invasive
measure of functional capacity under stress. CPET-derived variables predict
postoperative morbidity and mortality after major abdominal and thoracic surgery.
Two previous surveys have reported increasing utilisation of CPET preoperatively
in England. We aimed to evaluate current CPET practice in the UK, to identify who
performs CPET, how it is performed, how the data generated are used and the
funding models.
Methods: All anaesthetic departments in trusts with adult elective surgery in the
UK were contacted by telephone to obtain contacts for their pre-assessment and
CPET service leads. An online survey was sent to all leads between November 2016
and March 2017.
Results: The response rate to the online survey was 73.1% (144/197) with 68.1%
(98/144) reporting an established clinical service and 3.5% (5/144) setting up a
service. Approximately 30,000 tests are performed a year with 93.0% (80/86) using
cycle ergometry. Colorectal surgical patients are the most frequently tested
(89.5%, 77/86). The majority of tests are performed and interpreted by
anaesthetists. There is variability in the methods of interpretation and
reporting of CPET and limited external validation of results.
Conclusions: This survey has identified the continued expansion of perioperative
CPET services in the UK which have doubled since 2011. The vast majority of CPET
tests are performed and reported by anaesthetists. It has highlighted variation
in practice and a lack of standardised reporting implying a need for practice
guidelines and standardised training to ensure high-quality data to inform
perioperative decision making.

Köhler A, King R, Bahls M, Groß S, Steveling A, Gärtner S, Schipf S,  Gläser S, Völzke H, Felix SB, Markus MRP, Dörr M

Scandinavian Journal Of Medicine & Science In Sports [Scand J Med Sci Sports] 2018 Jan 18. Date of Electronic Publication: 2018 Jan 18.

Background: Peak oxygen uptake (VO2peak) is commonly indexed by total body weight (TBW) to determine cardiopulmonary fitness (CPF). This approach may lead to misinterpretation, particularly in obese subjects. We investigated the normalization of VO2peak by different body composition markers.
Methods: We analyzed combined data of 3,848 subjects (1,914 women; 49.7%), aged 20-90, from two independent cohorts of the population-based Study of Health in Pomerania (SHIP-2 and SHIP-TREND). VO2peak was assessed by cardiopulmonary exercise testing. Body cell mass (BCM), fat-free mass (FFM) and fat mass (FM) were determined by bioelectrical impedance analysis. The suitability of the different markers as a normalization variable was evaluated by taking into account correlation coefficients (r) and intercept (α-coefficient) values from linear regression models. A combination of high r and low α values was considered as preferable for normalization purposes.
Results: BCM was the best normalization variable for VO2peak (r=0.72; p=<0.001; α-coefficient=63.3 ml/min; 95%confidence interval [CI]: 3.48 to 123) followed by FFM (r=0.63; p=<0.001; α-coefficient=19.6 ml/min; 95%CI: -57.9 to 97.0). On the other hand, a much weaker correlation and a markedly higher intercept were found for TBW (r=0.42; p=<0.001; α-coefficient=579 ml/min; 95%CI: 483 to 675). Likewise, FM was also identified as a poor normalization variable (r=0.10; p=<0.001; α-coefficient=2,133; 95%CI: 2,074 to 2,191). Sex-stratified analyses confirmed the above order for the different normalization variables.
Conclusions: Our results suggest that BCM, followed by FFM, might be the most appropriate marker for the normalization of VO2peak when comparing CPF between subjects with different body shape. This article is protected by copyright. All rights reserved.

Yakal S, Sofyalı S, Özkan B, Yıldız S, Toker A, Kasikcioglu E
Department of Sports Medicine, Istanbul Faculty of Medicine, Istanbul University, Istanbul, Turkey.

Lung [Lung] 2018 Jan 18. Date of Electronic Publication: 2018 Jan 18

Objective: Peak oxygen consumption is a very valuable cardiopulmonary functional parameter in pre-operative evaluation of patients with lung cancer. However, it has several critical limitations for operability decision due to failure in achieving maximal level of exercise test for cases. The aim of this study was to reveal the importance of more accurate cardiopulmonary parameters that can be calculated from data of submaximal level test, such as oxygen uptake efficiency slope (OUES) and to determine whether it could be used in the operability decision phase for borderline cases by means of morbidity and mortality.
Materials and Methods: One hundred and twenty-five patients who were scheduled to undergo lung surgery due to lung cancer were included in the study. Peak oxygen uptake (pVO2), heart rate at the anaerobic threshold, and oxygen consumption volume at anaerobic threshold values were obtained after performing the cardiopulmonary exercise test. The OUES value was calculated from the ratio of the peak VO2 value and logarithmic equivalent of the ventilatory volume (VE). The following equation was used for determining OUES: VO2/log10 VE.
Results: The peak VO2 mean value was 21.37 ± 4.20 mL/min/kg in patients. However, OUES mean value was 12.44 ± 2.11. When the metabolic parameters of the patients were compared, a significant correlation was determined between the peak VO2 value and peak VE, OUES, and survival (p < 0.01).
Conclusion: This study demonstrated that OUES is significantly correlated with peak VO2 and it does not require the performance of maximal exercise and can be used together with peak VO2 in this patient population when there is difficulty in making decision for surgery in patients with lung cancer.

Saratzis A, Shakespeare J, Jones O, Bown MJ, Mahmood A, Imray
CHE
NIHR Leicester Cardiovascular Biomedical Research Unit, University of
Leicester, Leicester, UK. Electronic address: as875@le.ac.uk

Eur J Vasc Endovasc Surg. 2017 May;53(5):717-724. doi:
10.1016/j.ejvs.2017.01.014. Epub 2017 Mar 18.

BACKGROUND: Acute kidney injury (AKI) is a common complication after endovascular
intervention, associated with poor short and long-term outcomes. However, the
mechanisms underlying AKI development remain poorly understood. The impact of
pre-existing cardiovascular disease and low cardiovascular reserve (CVR) in AKI
is unclear; it remains unknown whether AKI is primarily related to pre-existing
comorbidity or to procedural parameters. The association between CVR and AKI
after EVAR was therefore assessed.
METHODS: This is a case control study. From a database of 484 patients, 292
undergoing elective endovascular aneurysm repair (EVAR) of an infrarenal
abdominal aortic aneurysm (AAA) in two tertiary centres were included. Of these,
73 patients who had developed AKI after EVAR were case matched, based on
pre-operative estimated glomerular filtration rate (eGFR; within
5 mL/min/1.73 m2) and age, with patients who had not developed AKI.
Cardiopulmonary exercise testing (CPET) was used to assess CVR using the
anaerobic threshold (AT). Development of AKI was defined using the Kidney Disease
Improving Outcomes (KDIGO) guidance. Associations between CVR (based on AT
levels) and AKI development were then analysed.
RESULTS: Pre-operative AT levels were significantly different between those who
did and did not develop AKI (12.1±2.9 SD vs. 14.8±3.0 mL/min/kg, p < .001). In
multivariate analysis, a higher level of AT (per 1 mL/min/kg) was associated with
a lower odds ratio (OR) of 0.72 (95% CI, 0.63-0.82, p < .001), relative to AKI
development. A pre-operative AT level of < 11 mL/min/kg was associated with
post-operative AKI development in adjusted analysis, with an OR of 7.8 (95% CI,
3.75-16.51, p < .001). The area under the curve (receiver operating
characteristic) for AT as a predictor of post-operative AKI was 0.81 (standard
error, 0.06, 95% CI, 0.69-0.93, p < .001).
CONCLUSIONS: Poor CVR was strongly associated with the development of AKI. This
provides pathophysiological insights into the mechanisms underlying AKI.

Zhang LY, Liu ZJ, Shen L, Huang YG
Department of Anesthesiology,PUMC Hospital,CAMS and PUMC,Beijing 100730,China

Zhongguo Yi Xue Ke Xue Yuan Xue Bao. 2017 Dec 20;39(6):831-835

Enhanced recovery after surgery (ERAS) is a new perioperative concept that aims
to reduce perioperative stress response and accelerate rehabilitation of patients
through a variety of optimized management. With the wider application of this
concept,the effective implementation of ERAS program has become a new challenge.
Cardiopulmonary exercise testing (CPET) has shown promising value in the
preoperative assessment,perioperative optimization,and postoperative
rehabilitation of ERAS. This article reviews the application of CPET in ERAS,with
an attempt to provide evidence for more detailed and comprehensive ERAS program.

Yen YS, Su DCJ, Yuan KS et al

The Physician And Sportsmedicine [Phys Sportsmed] 2018 Jan 10. Date of Electronic Publication: 2018 Jan 10.

Objectives: The significance of the isocapnic buffering (IB) phase – the period between the first ventilatory threshold (1stVT) and respiratory compensation point (RCP) – has not been adequately established in patients. This study aimed to determine the clinical significance of the IB phase in coronary artery disease (CAD) patients.
Methods: This retrospective study included data of sixty-two CAD patients after coronary artery bypass graft (CABG) or percutaneous coronary intervention (PCI) performed in a single medical center between 2010-2014. According to their physical conditions, the patients performed incremental cardiopulmonary exercise test (CPET) using a cycle ergometer by the ramp of 5-20 W/min. Correlations between the corrected IB phase duration and age, body mass index (BMI), left ventricular ejection fraction (LVEF), and CPET parameters were evaluated using Pearson correlation coefficients. Variables predicting peak oxygen consumption (VO2) were evaluated using multiple regression.
Results: Peak VO2 (p < 0.001), VO2 at RCP (p < 0.001), ∆O2/∆WR slope (p < 0.001), maximal partial pressure of end tidal CO2 (PetCO2) (p = 0.0012), VE/VCO2 slope (p = 0.010), BMI (p = 0.012), and age (p = 0.017) were significantly correlated, whereas LVEF (p = 0.246) and VO2 at 1stVT (p = 0.179) were not significantly correlated with the corrected IB phase duration. In multiple regression analysis, the corrected IB phase duration, VO2 at 1stVT, and ∆O2/∆WR slope were significantly associated with peak VO2.
Conclusion: The findings indicate that the IB phase duration is a useful indicator of peripheral cardiopulmonary function, endurance performance, and prognosis in CAD patients.