Cookies Policy
The website need some cookies and similar means to function. If you permit us, we will use those means to collect data on your visits for aggregated statistics to improve our service. Find out More
Accept Reject
  • Menu
About

About

I'm a postdoc researcher at the Centro de Sistemas de Computação Avançada (CRACS) of INESCTEC, in Porto. In 2015 I received my PhD in Clinical Health Services Research from the Faculty of Medicine, University of Porto, with a thesis entitled Assessing Complexity of Physiological Interactions. In 2010 I obtained M.Sc. degree in Mathematical Engineering, from the Faculty of Science, University of Porto.

From 2012 to 2015 I worked as a Pre/Post-Doctoral at  the  Wyss  Institute  for  Biologically  Inspired  Engineering, Harvard   Medical   School,   Boston,   USA under supervison of Dr. Ary Goldberger and Madalena Costa. In 2015-2016 I worked has a research  fellow  at Center  for  Anesthesia  Research  Excellence  (CARE), Beth  Israel Deaconess  Medical  Center,  Boston,  USA (Supervisors:  Ary  L.  Goldberger,MD  and Balachundhar Subramaniam, MD, MPH).

Interest
Topics
Details

Details

001
Publications

2020

Changes in nonlinear dynamic complexity measures of blood pressure during anesthesia for cardiac surgeries using cardio pulmonary bypass

Authors
Rangasamy, V; Henriques, TS; Mathur, PA; Davis, RB; Mittleman, MA; Subramaniam, B;

Publication
Journal of Clinical Monitoring and Computing

Abstract
Nonlinear complexity measures computed from beat-to-beat arterial BP dynamics have shown associations with standard cardiac surgical risk indices. They reflect the physiological adaptability of a system and has been proposed as dynamical biomarkers of overall health status. We sought to determine the impact of anesthetic induction and cardiopulmonary bypass (CPB) upon the complexity measures computed from perioperative BP time series. In this prospective, observational study, 300 adult patients undergoing cardiac surgery were included. Perioperative period was divided as: (1) Preoperative (PreOp); (2) ORIS—induction to sternotomy; (3) ORSB- sternotomy to CPB; (4) ORposB—post CPB and within 30 min before leaving OR and (5) postoperative phase (PostOp)—initial 30 min in the cardiac surgical intensive care unit. BP waveforms for systolic (SAP), diastolic (DAP), mean arterial pressure (MAP) and pulse pressure (PP) were recorded, and their corresponding complexity index (MSE?) was calculated. Significant decrease in MSE? from Preop to PostOp phases was observed for all BP time series. Maximum fall was seen during post anesthetic induction (ORIS) phase. Mild recovery during the subsequent phases was observed but they never reached the baseline values. In an exploratory analysis, preoperative MSE? showed a significant correlation with postoperative length of ICU stay. Blood pressure complexity varies at different time points and is not fixed for a given individual. Preoperative BP Complexity decreased significantly following anesthetic induction and did not recover to baseline until 30 min after surgery. Prevention of this significant fall may offer restoration of MSE? throughout surgery. Furthermore, preoperative BP complexity needs to be explored as a predictor of major postoperative adverse events by itself or in addition with the current risk indices. © 2019, Springer Nature B.V.

2020

Preoperative Blood Pressure Complexity Indices as a Marker for Frailty in Patients Undergoing Cardiac Surgery

Authors
Rangasamy, V; Henriques, TS; Xu, XL; Subramaniam, B;

Publication
Journal of Cardiothoracic and Vascular Anesthesia

Abstract
Objective: Frailty, a state of decreased physiological reserve, increases the risk of adverse outcomes. There is no standard tool for frailty during perioperative period. Autonomic dysfunction, an underlying process in frailty, could result in hemodynamic fluctuations. Complexity, the physiological adaptability of a system can quantify these fluctuations. The authors hypothesized that complexity could be a marker for frailty and explored their relationship in cardiac surgical patients. Design: Prospective, observational study. Setting: Single-center teaching hospital. Participants: Three hundred and sixty-four adult patients undergoing cardiac surgery. Intervention: None. Measurements and Main Results: Preoperative beat-to-beat systolic arterial pressure (SAP) and mean arterial pressure (MAP) time series were obtained. Complexity indices were calculated using multiscale entropy (MSE) analysis. Frailty was assessed from: age >70 years, body mass index <18.5, hematocrit <35%, albumin <3.4 g/dL, and creatinine >2.0 mg/dL. The association between complexity indices and frailty was explored by logistic regression and predictive ability by C-statistics. In total, 190 (52%) patients had frailty. The complexity index (MSES) median (quartile 1, quartile 3) of SAP and MAP time series decreased significantly in frail patients (SAP: 8.32 [7.27, 9.24] v 9.13 [8.00, 9.72], p < 0.001 and MAP: 8.56 [7.56; 9.27] v 9.18 [8.26; 9.83], p < 0.001). MSE S demonstrated a fair predictive ability of frailty (C-statistic: SAP 0.62 and MAP 0.64). Conclusion: Preoperative BP complexity indices correlate and predict frailty. Impaired autonomic control is the underlying mechanism to explain this finding. A simple automated measure of preoperative BP complexity in the surgeon's office has the potential to reliably assess frailty. © 2019 Elsevier Inc.

2018

Complexity of preoperative blood pressure dynamics: possible utility in cardiac surgical risk assessment

Authors
Henriques, TS; Costa, MD; Mathur, P; Mathur, P; Davis, RB; Mittleman, MA; Khabbaz, KR; Goldberger, AL; Subramaniam, B;

Publication
Journal of Clinical Monitoring and Computing

Abstract

2018

Comparison of Invasive and Noninvasive Blood Pressure Measurements for Assessing Signal Complexity and Surgical Risk in Cardiac Surgical Patients

Authors
Gibson, LE; Henriques, TS; Costa, MD; Davis, RB; Mittleman, MA; Mathur, P; Subramaniam, B;

Publication
Anesthesia & Analgesia

Abstract

2016

Multiscale Poincare plots for visualizing the structure of heartbeat time series

Authors
Henriques, TS; Mariani, S; Burykin, A; Rodrigues, F; Silva, TF; Goldberger, AL;

Publication
BMC MEDICAL INFORMATICS AND DECISION MAKING

Abstract
Background: Poincare delay maps are widely used in the analysis of cardiac interbeat interval (RR) dynamics. To facilitate visualization of the structure of these time series, we introduce multiscale Poincare (MSP) plots. Methods: Starting with the original RR time series, the method employs a coarse-graining procedure to create a family of time series, each of which represents the system's dynamics in a different time scale. Next, the Poincare plots are constructed for the original and the coarse-grained time series. Finally, as an optional adjunct, color can be added to each point to represent its normalized frequency. Results: We illustrate the MSP method on simulated Gaussian white and 1/f noise time series. The MSP plots of 1/f noise time series reveal relative conservation of the phase space area over multiple time scales, while those of white noise show a marked reduction in area. We also show how MSP plots can be used to illustrate the loss of complexity when heartbeat time series from healthy subjects are compared with those from patients with chronic (congestive) heart failure syndrome or with atrial fibrillation. Conclusions: This generalized multiscale approach to Poincare plots may be useful in visualizing other types of time series.