Rev Port Cardiol. 2017 Feb 23

Aguiar Rosa S(1), Abreu A(2), Marques Soares R(2), Rio P(2), Filipe C(3),
Rodrigues I(2), Monteiro A(2), Soares C(2), Ferreira V(2), Silva S(2), Alves
S(2), Cruz Ferreira R(2).

INTRODUCTION: Cardiac rehabilitation (CR) has been demonstrated to improve
exercise capacity in acute coronary syndrome (ACS), but not all patients derive
the same benefit. Careful patient selection is crucial to maximize resources.
OBJECTIVE: To identify in a heterogeneous ACS population which patients would
benefit the most with CR, in terms of functional capacity (FC), by using
cardiopulmonary exercise testing (CPET).
METHODS: A retrospective analysis of consecutive ACS patients who underwent CR
and CPET was undertaken. CPET was performed at baseline and after 36 sessions of
exercise. Peak oxygen uptake (pVO2), percentage of predicted pVO2, minute
ventilation/CO2 production (VE/VCO2) slope, VE/VCO2 slope/pVO2 and peak
circulatory power (PCP) (pVO2 times peak systolic blood pressure) were assessed
in two moments. The differences in pVO2 (ΔpVO2), %pVO2, PCP and exercise test
duration were calculated. Patients were classified according to baseline pVO2
(group 1, <20 ml/kg/min vs. group 2, ≥20 ml/kg/min) and left ventricular ejection
fraction (group A, <50% vs. group B, ≥50%).
RESULTS: We analyzed 129 patients, 86% male, mean age 56.3±9.8 years. Both group
1 (n=31) and group 2 (n=98) showed significant improvement in FC after CR, with a
more significant increase in pVO2, in group 1 (ΔpVO2 4.4±7.3 vs. 1.6±5.4;
p=0.018). Significant improvement was observed in CPET parameters in group A
(n=34) and group B (n=95), particularly in pVO2 and test duration.
CONCLUSION: Patients with lower baseline pVO2 (<20 ml/kg/min) presented more
significant improvement in FC after CR. CPET which is not routinely used in
assessement before CR in context of ACS, could be a valuable tool to identify
patients who will benefit the most

Clin Cardiol. 2017 Feb;40(2):95-101. doi: 10.1002/clc.22635. Epub 2016 Nov 2.

Zhao QH(1), Wang L(1), Pudasaini B(1), Jiang R(1), Yuan P(1), Gong SG(1), Guo
J(2), Xiao Q(1), Liu H(1), Wu C(3), Jing ZC(4), Liu JM(1,)(2).

(1)Department of Pulmonary Circulation, Shanghai Pulmonary Hospital, Tongji
University, School of Medicine, Shanghai, China. (2)Department of Pulmonary
Function, Shanghai Pulmonary Hospital, Tongji University, School of Medicine,
Shanghai, China. (3)Department of Statistics, the Second Military Medical
University, Shanghai, China. (4)State Key Laboratory of Cardiovascular Disease,
Fu Wai Hospital, Peking Union Medical College and Chinese Academy of Medical
Science, Beijing, China.

BACKGROUND: Doppler echocardiography is usually the first diagnostic
investigation for patients suspected with pulmonary hypertension (PH), but it is
often inaccurate when used alone, especially in mild PH.
HYPOTHESIS: Cardiopulmonary exercise testing (CPET) may serve as a complementary
tool to improve diagnostic accuracy in echocardiography-suspected “PH possible”
patients.
METHODS: Eighty-eight consecutive patients with suspected PH (referred to as “PH
possible” hereafter) based on echocardiography were included in the study. CPET
was assessed subsequently and PH was confirmed by right-heart catheterization in
all subjects. We analyzed CPET data from patients and derived a CPET prediction
rule to hemodynamically differentiate PH.
RESULTS: Eighty-eight patients (27 patients with confirmed PH, and PH ruled out
in 61 patients) were included in the study. Compared with non-PH patients, the PH
subjects had lower peak oxygen uptake (VO2 ), aerobic capacity (AT), peak partial
pressure of end-tidal CO2 (PET CO2 ), oxygen uptake efficiency plateau (OUEP),
and oxygen uptake efficiency slope (OUES), along with higher minute ventilation
(VE)/carbon dioxide output (VCO2 ) slope and lowest VE/VCO2 (P < 0.001). VE/VCO2
slope and AT were independent predictors of PH derived from multivariate logistic
regression adjusted for age and body mass index. A score combining VE/VCO2 slope
and AT reached a high area under the curve value of 0.98. A score ≥0.5 had 95%
specificity and 92.6% sensitivity for diagnosis of PH.
CONCLUSIONS: A score combining VE/VCO2 slope and AT provides high specificity in
screening out PH from a pool of echocardiography-suspected PH patients.

J Invasive Cardiol. 2017 Mar;29(3):83-91.

Abdullah SM(1), Hastings JL, Amsavelu S, Garcia-Morales F, Hendrix F, Karatasakis
A, Danek BA, Karacsonyi J, Rangan BV, Roesle M, Khalili H, Banerjee S, Brilakis
ES.

OBJECTIVES: Although coronary chronic total occlusions (CTOs) are treated with
percutaneous coronary intervention (PCI) to improve symptoms, studies
demonstrating symptom improvement have been mostly limited to questionnaire
responses. The current study assessed for changes in peak oxygen uptake during
cardiopulmonary exercise testing after CTO-PCI.
METHODS: Patients with heart failure or angina symptoms referred for CTO-PCI were
prospectively enrolled. The primary outcome of the study was improvement in peak
oxygen uptake during cardiopulmonary exercise (CPX) testing 5 months after
CTO-PCI. Secondary outcomes included improvement in physical capacity, angina,
and self perception of health as assessed by questionnaires, and in plasma brain
natriuretic peptide (BNP) levels.
RESULTS: CTO-PCI was attempted in 32 men (mean age, 62 ± 6 years; CTO vessel: 47%
right coronary, 44% left anterior descending). CTO-PCI was unsuccessful in 1
patient, and 3 patients had restenosis of their CTO vessel at follow-up. In the
28 patients with patent CTO vessel at follow-up, significant improvements were
noted in self-reported physical capacity, angina, and several aspects of health
perception. In the 25 patients who underwent baseline and follow-up CPX testing,
peak oxygen uptake significantly improved from 17.7 ± 4.3 mL/kg/min to 19.1 ± 4.0
mL/kg/min (P=.02). Plasma BNP levels significantly decreased from 143 ± 138 pg/mL
to 102 ± 123 pg/mL (P=.01).
CONCLUSIONS: CTO-PCI in symptomatic patients was associated with improvements in
cardiovascular exercise capacity, as assessed by peak oxygen uptake. These
results suggest that in symptomatic patients with CTOs, PCI appears clinically
beneficial.

Eur Respir Rev. 2017 Feb 21;26(143).

Bonini M, Fiorenzano G.

Interstitial lung diseases (ILDs) represent a heterogeneous group of pathologies
characterised by alveolar and interstitial damage, pulmonary inflammation
(usually associated with fibrosis), decreased lung function and impaired gas
exchange, which can be attributed to either a known or an unknown aetiology.
Dyspnoea is one of the most common and disabling symptoms in patients with ILD,
significantly impacting quality of life. The mechanisms causing dyspnoea are
complex and not yet fully understood. However, it is recognised that dyspnoea
occurs when there is an imbalance between the central respiratory efferent drive
and the response of the respiratory musculature. The respiratory derangement
observed in ILD patients at rest is even more evident during exercise.
Pathophysiological mechanisms responsible for exertional dyspnoea and reduced
exercise tolerance include altered respiratory mechanics, impaired gas exchange,
cardiovascular abnormalities and peripheral muscle dysfunction.This review
describes the respiratory physiology of ILD, both at rest and during exercise,
and aims to provide comprehensive and updated evidence on the clinical utility of
the cardiopulmonary exercise test in the assessment and management of these
pathological entities. In addition, the role of exercise training and pulmonary
rehabilitation programmes in the ILD population is addressed.

Cleve Clin J Med. 2017 Feb;84(2):161-168.

Leclerc K.

Cardiopulmonary exercise testing (CPET) helps in detecting disorders of the
cardiovascular, pulmonary, and skeletal muscle systems. It has a class I
(indicated) recommendation from the American College of Cardiology and American
Heart Association for evaluating exertional dyspnea of uncertain cause and for
evaluating cardiac patients being considered for heart transplant. Advances in
hardware and software and ease of use have brought its application into the
clinical arena to the point that providers should become familiar with it and
consider it earlier in the evaluation of their patients.

Int J Cardiol. 2017 Feb 10. pii: S0167-5273(16)32158-1.

Kunutsor SK(1), Kurl S(2), Khan H(3), Zaccardi F(4), Laukkanen JA(5).

BACKGROUND: Oxygen uptake (VO2) at ventilatory threshold (VT), is a
cardiopulmonary exercise testing parameter which may be a proxy for peak VO2. We
aimed to assess the associations of VO2 at VT with sudden cardiac death (SCD),
fatal coronary heart disease (CHD) and cardiovascular disease (CVD), and
all-cause mortality.
METHODS AND RESULTS: VO2 at VT was assessed during a submaximal exercise test
using respiratory gas analyzers in the Kuopio Ischemic Heart Disease cohort of
1639 middle-aged men. Hazard ratios (HRs) (95% CIs) were assessed. During a
median follow-up of 25.6years, 121 SCDs, 202 fatal CHDs, 312 fatal CVDs, and 703
all-cause mortality events occurred. VO2 at VT was correlated with peak VO2
(r=0.90) and linearly associated with each outcome. Comparing extreme quartiles
of VO2 at VT, the HRs (95% CIs) for SCD, fatal CHD, fatal CVD, and all-cause
mortality on adjustment for established risk factors were 0.37 (0.18-0.78), 0.32
(0.18-0.57), 0.45 (0.30-0.69), and 0.50 (0.38-0.64) respectively. The HRs were
1.02 (0.36-2.91), 1.43 (0.63-3.25), 1.46 (0.79-2.71), and 1.02 (0.69-1.51)
respectively on further adjustment for peak VO2. Addition of VO2 at VT to a CVD
mortality risk prediction model containing established risk factors significantly
improved risk discrimination and reclassification at 25years.
CONCLUSIONS: There are linear and inverse associations of VO2 at VT with fatal
cardiovascular and all-cause mortality events, which are dependent on peak VO2.
Inclusion of VO2 at VT in the standard established risk factors panel
significantly improves the prediction and classification of long-term CVD
mortality risk.

West, M. A.; Asher, R.; Browning, M.; Minto, G.; Swart, M.;
Richardson, K.; McGarrity, L.; Jack, S.; Grocott, M. P. W.; Challand,
C.; wan Lai, C.; Struthers, R.; Sneyd, R.; Psarelli, E..

British Journal of Surgery: BJS, May 2016, Vol. 103 Issue: Number 6 p744-752,

Abstract: In single‐centre studies, postoperative complications are
associated with reduced fitness. This study explored the relationship
between cardiorespiratory fitness variables derived by cardiopulmonary
exercise testing (CPET) and in‐hospital morbidity after major elective
colorectal surgery. Patients underwent preoperative CPETwith recording
of in‐hospital morbidity. Receiver operating characteristic (ROC)
curves and logistic regression were used to assess the relationship
between CPET variables and postoperative morbidity. Seven hundred and
three patients from six centres in the UK were available for analysis
(428 men, 275 women). ROCcurve analysis of oxygen uptake at estimated
lactate threshold (V˙o2at θ^L) and at peak exercise (V˙o2peak) gave an
area under the ROCcurve (AUROC) of 0·79 (95 per cent c.i. 0·76 to 0·83;
P< 0·001; cut‐off 11·1 ml per kg per min) and 0·77 (0·72 to 0·82; P<
0·001; cut‐off 18·2 ml per kg per min) respectively, indicating that
they can identify patients at risk of postoperative morbidity. In a
multivariable logistic regression model, selected CPETvariables and
body mass index (BMI) were associated significantly with increased odds
of in‐hospital morbidity (V˙o2at θ^L11·1 ml per kg per min or less:
odds ratio (OR) 7·56, 95 per cent c.i. 4·44 to 12·86, P< 0·001;
V˙o2peak18·2 ml per kg per min or less: OR2·15, 1·01 to 4·57, P =0·047;
ventilatory equivalents for carbon dioxide at estimated lactate
threshold (V˙E/V˙co2at θ^L) more than 30·9: OR1·38, 1·00 to 1·89, P
=0·047); BMIexceeding 27 kg/m2: OR1·05, 1·03 to 1·08, P< 0·001). A
laparoscopic procedure was associated with a decreased odds of
complications (OR0·30, 0·02 to 0·44; P =0·033). This model was able to
discriminate between patients with, and without in‐hospital morbidity
(AUROC0·83, 95 per cent c.i. 0·79 to 0·87). No adverse clinical events
occurred during CPET across the six centres. These data provide further
evidence that variables derived from preoperative CPETcan be used to
assess risk before elective colorectal surgery. Validated risk
assessment; (AN 38537189)