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Padmanabhan D, Bhushan M, Amba R, Joseph P, Sibal S, Vangal R, Venu A, Rao S, Manjunath CN, Vidyasagar K, Reddy S. P1460Seismocardiographic measurement of systolic time intervals in left ventricular dysfunction: validation with transthoracic echo. Eur Heart J 2019. [DOI: 10.1093/eurheartj/ehz748.0225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Background
Systolic time intervals (STI) measured using Transthoracic Echo (TTE) have been shown to be sensitive indicators of contractile performance, but TTE is limited to a hospital setting. Recent advances in technology have enabled the simultaneous measurement of Electrocardiograms (ECG) and Seismocardiograms (SCG) using wearable devices. However, the use SCG to measure STIs has not been validated in a mobile setting, or on pathological subjects.
Purpose
To test the validity of an automated algorithm for measuring STIs using a wearable device recording ECG and SCG, in subjects with varying degrees of left ventricular dysfunction.
Methods
179 Patients with suspected left ventricular dysfunction were assessed using TTE performed by a Cardiologist. Patients were simultaneously fitted with a novel wearable device worn on a chest strap, recording SCG and single-lead ECG data, while the cardiologist measured the pre-ejection period (PEP) and left ventricular ejection time (LVET) with the patient in a supine position. Of these subjects 29 (16.2%) were diagnosed with Dilated cardiomyopathy (DCM), and 109 (60.8%) had Ischemic Heart disease.
The SCG and ECG data recorded on the wearable device was then analysed using a peak-detection algorithm, which detected the Q,R,S points on the ECG, and then determined the 4 most prominent peaks in the SCG signal corresponding to each R-peak. Heart rate, patient's age, gender and SCG time intervals were then used in a DecisionTree algorithm to determine the values of PEP and LVET, which were were then compared against those determined by the cardiologist using TTE.
Results
The correlation coefficient (r2) between PEP calculated using TTE, and the values obtained from the algorithm analyzing SCG data was 0.92 while the mean error was 7.47%. The r2 between the LVET calculated using the TTE and the algorithm was 0.75, while the mean error was 8.53% (p-value<0.001 for all cases).
Results All Subjects With IHD Without IHD With DCM Without DCM Number of Subjects 178 109 69 29 149 PEP (r2) 0.92 0.89 0.94 0.88 0.91 PEP (% age error) 7.47 7.50 7.42 6.99 7.56 LVET (r2) 0.75 0.81 0.66 0.55 0.83 LVET (% age error) 8.53 6.69 11.4 20.42 6.16 DCM, Dilate Cardiomyopathy; IHD, Ischemic Heart Disease.
ECG + SCG signals for a DCM patient
Conclusion
The algorithm-derived STIs measured by SCG correlate well with those measured by TTE across most patient groups, including those with Dilated Cardiomyopathy and Ischemic Heart Disease, opening prospects for continuous remote monitoring of STIs in a mobile setting.
Acknowledgement/Funding
Fourth Frontier Technologies
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Affiliation(s)
- D Padmanabhan
- Sri Jayadeva Institute of Cardiovascular Sciences and Research, Bangalore, India
| | - M Bhushan
- Fourth Frontier Technologies, Bangalore, India
| | - R Amba
- Fourth Frontier Technologies, Bangalore, India
| | - P Joseph
- Fourth Frontier Technologies, Bangalore, India
| | - S Sibal
- Fourth Frontier Technologies, Bangalore, India
| | - R Vangal
- Fourth Frontier Technologies, Bangalore, India
| | - A Venu
- Fourth Frontier Technologies, Bangalore, India
| | - S Rao
- Fourth Frontier Technologies, Bangalore, India
| | - C N Manjunath
- Sri Jayadeva Institute of Cardiovascular Sciences and Research, Bangalore, India
| | | | - S Reddy
- Sri Jayadeva Institute of Cardiovascular Sciences and Research, Bangalore, India
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Balakrishnarajan MM, Jemmis ED, Gupta S, Mazumdar S, Mukherjee P, Machonkin T, Dubois JL, Cole AP, Hedman B, Hodgson KO, Solomon EI, Stack TDP, Roesky HW, Manoharan PT, Baitalik S, Nag K, Sarkar S, Seshadri R, Felser C, Nixon JF, Katti KV, Pillarsetty N, Kamei H, Bora U, Chaudhuri MK, Dhar SS, Kalita D, Anand BN, Ramanan A, Roy P, Duraisamy T, Sharma S, Ayyappan P, Gupta BD, Kanth VV, Singh V, Suresh E, Boopalan K, Jasra RV, Bhadbhade MM, Naganagowda GA, Ramanathan KV, Gayathri V, Nanjegowda NM, Sengupta P, Ghosh S, Bhattacharjee M, Gupta SS, Datta R, Sastri CV, Easwaramoorthy D, Lakshmi A, Giribabu L, Maiya BG, Reddy PR, Radhika M, Nightingale KF, Srinivasan R, Venkatesan R, Rajendiran TM, Sambasiva Rao P, Bhavana P, Bhyrappa P, Ravikanth M, Kumaraswamy S, Kommana P, Padmaja G, Kumara Swamy KC, Mondal B, Chakraborty S, Lahiri GK, Ray M, Que L, Saxena A, Sampriya N, Brar AS, Shankar R, Sahoo BB, Panday G, Wasthi AA, Chauhan SMS, Wadhwani P, Bandyopadhyay DK, Bandyopadhyay R, Biswas S, Bhattacharyya R, Johis V, Kotkar D, Pathak VS, Swayambhunathan V, Kamat P, Das A, Ghosh PK, Gupta R, Mukherjee R, Walawalkar MG, Pal SK, Krishnan A, Samuelson AG, Das PK, Anantharaman G, Baheti K, Murugavel R, Garg G, Ganguli AK, Suresh M, Prasadarao AV, Neeraj S, Natarajan S, Rao CNR, Vanitha PV, Santhosh PN, Rao CNR, Kumar GG, Munichandraiah N, Ramakrishna TVV, Elias AJ, Vij A, Rajak KK, Rath SP, Dutta S, Bhattacharya PK, Natarajan P, Paul P, Dhanasekaran T, Prakash H, Mangayarkarasi N, Zacharias PS, Srinivasan A, Pushpan SK, Anand VG, Chandrashekar TK, Tripathi P, Som A, Bharadwaj PK, Mathew N, Jagirdar BR, Mandal SK, Naganagowda GA, Krishnamurthy SS, Singh UP, Singh R, Hikichi S, Moro-Oka Y, Sevagapandian S, Nehru K, Athappan PR, Murali M, Palaniandavar M, Singh RB, Mitra S, Reddy PAN, Datta R, Chakravarty AR, Sunkari S, Rajasekharan MV, Shukla AD, Bajaj HC, Das A, Krishnamurthy D, Sathiyendiran M, Murugavel R, Rao KM, Boag NM, Neogi DN, Bhawmick R, Bandyopadhyay P, Thomas AM, Mandal GC, Tiwary SK, Chakravarty AR, Sah AK, Das TM, Wegelius EK, Kolehmainen E, Saarenketo PK, Rissanen K, Rao CP, Warad DU, Satish CD, Bajgur CS, Manonmani J, Narayanan V, Kandaswamy M, Kingston JV, Sundaram GSM, Rao MNS, Rajendiran TM, Kannappan R, Venkatesan R, Rao PS, Bilakhiya AK, Tyagi B, Paul P, Dhar SD, Chaudhuri MK, Ghosh T, Banerjee R, Kureshy RI, Khan NH, Abdi SHR, Patel ST, Iyer P, Jasra RV, Chatterjee D, Mitra A, Mukherjee S, Ganesan V, Ramaraj R, Shunmugasundari T, Thanasekaran P, Rajagopal S, Bohra R, Sharma N, Nagar S, Panda R, Balakrishna MS, Vaidhyanathan R, Natarajan S, Rao CNR, Choudhury A, Natarajan S, Rao CNR, Chakrabarty D, Mahapatra S, Devi MS, Vidyasagar K, Mody HM, Pandya P, Bhatt P, Jasra RV, Padmanabhan M, Mathew T, Shukla AD, Dave PC, Suresh E, Pathak G, Das A, Dastidar P, Mahalakshmi L, Krishnamurthy SS, Nethaji M, Rath N, Mathew N, Jagirdhar B, Gopalan RS, Kulkarni GU, Sridevi S, Narayanan J, Chandrashekar TK, Saha A, Ghosh AK, Majumdar P, Goswami S, Abhyankar RM, Balakrishna MS, Basuli F, Bhattacharya S, Mondal N, Saha MK, Bag B, Mitra S, Pal S, Sangeetha NR, Pal S, Dey M, Saarenketo PK, Kolehmainen E, Rissanen K, Rao CP, Suresh E, Bhadbhade MM, Padmakumar K, Manoharan PT, Vernekar B, Srinivasan BR, Ramesh K, Bharathi DS, Samuelson AG, Lokanath NK, Shridhar MA, Prasad S, Venkatraman NV, Vasudevan S, Mimani T, Patil KC, Tiwari AP, Mukkada BJ, Arunan E, Mathias PC, Abraham B, Karthikeyan B, Pal SK, Samuelson AG, Umapathy S, Panda PK, Krishnan V. Abstract. J CHEM SCI 2000. [DOI: 10.1007/bf02706182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Vidyavathy Balraj V, Vidyasagar K. Low-Temperature Syntheses and Characterization of Novel Layered Tellurites, A(2)Mo(3)TeO(12) (A = NH(4), Cs), and "Zero-Dimensional" Tellurites, A(4)Mo(6)Te(2)O(24).6H(2)O (A = Rb, K). Inorg Chem 1998; 37:4764-4774. [PMID: 11670639 DOI: 10.1021/ic980102e] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrothermal synthetic investigations to prepare new A(2)Mo(3)TeO(12) (A = NH(4), Cs, Rb, K) compounds are described. Novel noncentrosymmetric layered tellurites, (NH(4))(2)Mo(3)TeO(12) (1) and Cs(2)Mo(3)TeO(12) (2), have been synthesized by hydrothermal methods. Their structures contain two-dimensional hexagonal tungsten oxide related (Mo(3)TeO(12))(2)(-) anionic layers interleaved with NH(4)(+)/Cs(+) ions. New "zero-dimensional" tellurites, Rb(4)Mo(6)Te(2)O(24).6H(2)O (3) and K(4)Mo(6)Te(2)O(24).6H(2)O (4), containing discrete centrosymmetric (Mo(6)Te(2)O(24))(4)(-) anionic aggregates and alkali metal ions have been synthesized by simple refluxing of stoichiometric reactants in water. In this hexamolybdoditellurite anion, the Mo(6)O(24) flat hexagonal ring, formed from edge sharing of six MoO(6) octahedra, is capped by tellurium on both sides. The two types of anions have the same empirical formula. Cs(2)Mo(3)TeO(12) (2) could be prepared by a solid state reaction as well. All four new tellurites have been structurally characterized by single-crystal X-ray diffraction studies. Pertinent crystal, data are as follows: for 1, hexagonal space group P6(3), a = 7.332(2) Å, c = 12.028(4) Å, Z = 2; for 2, hexagonal space group P6(3), a = 7.3956(10) Å, c = 12.186(2) Å, Z = 2; for 3, monoclinic space group P2(1)/c, a = 10.0564(14) Å, b = 9.877(8) Å, c = 15.724(3) Å, beta = 109.988(11) degrees, Z = 2; for 4, monoclinic space group P2(1)/c, a = 9.878(3) Å, b = 9.724(4) Å, c = 15.301(3) Å, beta = 108.57(2) degrees, Z = 2. Low-temperature syntheses, structure, and powder X-ray diffraction, spectroscopic, and thermal studies of compounds 1-4 are described.
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