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Azimuthal variation of the P phase in Icelandic receiver functions

V. Schlindwein
2001 Geophysical Journal International  
A dipping interface at shallow depth results in a P±S converted phase arriving shortly after the P phase.  ...  The amplitudes of the direct P phase and the P±S phase converted at a dipping interface would be expected to vary strongly with azimuth in accordance with the observed behaviour.  ...  Du & Foulger 1999; Schlindwein 2000) have been undertaken to shed more light on the nature and depth of the crust±mantle transition beneath Iceland.  ... 
doi:10.1046/j.0956-540x.2000.01290.x fatcat:thmdqh6qijfbzdb7wmqrnr72by

Reproducibility of the signal averaged P wave: time and frequency domain analysis

P. J. Stafford, J. Cooper, J. Fothergill, F. Schlindwein, D. P. deBono, C. J. Garratt
1997 Heart  
Variation in P wave morphology was noted when successive P waves from the same subject were examined.  ...  If recordings with the same P wave morphology were analysed the reproducibility of spatial velocity and P wave energy improved but remained significantly poorer than that for P wave duration.  ...  However, P waves were then aligned by template matching to an evenly spaced 15 point P wave derived template (that is, true P wave triggered averaging).  ... 
doi:10.1136/hrt.77.5.412 pmid:9196409 pmcid:PMC484761 fatcat:4fbaqc7nkzhhfduntp3ziwommm

Analysis of QRS-T subtraction in unipolar atrial fibrillation electrograms

J. L. Salinet, J. P. V. Madeiro, P. C. Cortez, P. J. Stafford, G. André Ng, F. S. Schlindwein
2013 Medical and Biological Engineering and Computing  
The equation for the Power ratio index is       5 . 5 3 12 5 . 5 5 . 5 3 12 5 . 5 ) ( ) ( df f P df f P P P P ratio  ...  For QRS delineation we search for onset and end point within a time window defined by [R P -300(ms), R P +190(ms)], where R P is the location of the detected R peak and, for each window, the filtering  ... 
doi:10.1007/s11517-013-1071-4 pmid:23564223 fatcat:6pze5bjuojg3ple5yt42neediu

Signal averaged P wave compared with standard electrocardiography or echocardiography for prediction of atrial fibrillation after coronary bypass grafting

P. J. Stafford, S. Kolvekar, J. Cooper, J. Fothergill, F. Schlindwein, D. P. deBono, T. J. Spyt, C. J. Garratt
1997 Heart  
From the ECG, lead II P wave duration, P terminal force in lead Vl, total P wave duration, and isoelectric interval were measured.  ...  Filtered P wave duration (SAPWD), spatial velocity, and energy were calculated from the SAPW.  ...  Downloaded from Stafford, Kolvekar, Cooper, Fothergill, Schlindwein, deBono, et al on 26 April 2019 by guest.  ... 
doi:10.1136/hrt.77.5.417 pmid:9196410 pmcid:PMC484762 fatcat:xcvge6yzsjaelm3him6nsppzza

73 * Ablation for persistent atrial fibrillation shrinks left atrial high dominant frequency areas

N. Dastagir, G. S. Chu, F. J. Vanheusden, J. L. Salinet, T. P. Almeida, X. Li, P. J. Stafford, A. J. Sandilands, F. S. Schlindwein, G. A. Ng
2014 Europace  
This decreased significantly to 11.2% post Pulmonary Vein Isolation (PVI) (p<0.001).  ... 
doi:10.1093/europace/euu243.7 fatcat:67o3z5jt6vblbnmc73apt75qzm

074 HUMAN VS ROBOT: A COMPARISON OF CATHETER CONTACT FORCE APPLICATION FOR AF ABLATION (A MAST-AF SUBSTUDY)

G S Chu, N Masca, T P Almeida, P D Brown, F S Schlindwein, G A Ng
2013 Heart  
On the LWACA, the overall mean force applied from the Amigo was 8.2 g, compared with 7.3 g manually, whilst for the RWACA, the Amigo applied a mean force of 10.2 g, compared with 9.3 g manually ( p<0.05  ... 
doi:10.1136/heartjnl-2013-304019.74 fatcat:o6joanohqrg4nfqeob6n4zvu5a

66 * Investigating differences in complex fractionated atrial electrogram discrimination as performed by CARTO and NavX algorithms

T. P. Almeida, G. S. Chu, F. J. Vanheusden, X. Li, J. L. Salinet, J. H. Tuan, P. J. Stafford, F. S. Schlindwein, G. A. Ng
2014 Europace  
(B) Percentage of CFAEs as measured by CFE-Mean and ICL .Results (cont.) f C F A E s -P r e -/ p o s t -a b la t io n Figure 3 : 3 (A) comparison between ICL and CFE-Mean measured for all 797 EGMs, with  ... 
doi:10.1093/europace/euu242.8 fatcat:2ufjw3brgbaf7cmjlrwccune2y

Heart rate variability in low birth weight growth restricted children during sleep and wake stages

Wajid Aziz, Taher Biala, Nazneen Habib, Muhammad Saleem Abbasi, Michael P. Wailoo, Fernando S. Schlindwein
2013 Measurement (London)  
*p-value<0.05 and ** p-value<0.005 and ns for non significant HRV Normal Sleep IUGR Sleep Measures Male Female p-value Male Female p-value RR (ms) 872.16±75.48 797.24±46.31 ** 809.71±65.42 814.05±58.70  ...  *p-value<0.05 and ** p-value<0.005 HRV Sleep Stage Wake Stage Measures Normal IUGR p-value Normal IUGR p-value RR (ms) 844.07±74.90 812.31±59.80 ns 583.14±58.26 593.74±72.54 ns SDNN (ms) 123.02±29.92 100.80  ... 
doi:10.1016/j.measurement.2013.04.007 fatcat:vlue5fye2zddbnezy55uddsebm

Characterization of human persistent atrial fibrillation electrograms using recurrence quantification analysis

Tiago P. Almeida, Fernando S. Schlindwein, João Salinet, Xin Li, Gavin S. Chu, Jiun H. Tuan, Peter J. Stafford, G. André Ng, Diogo C. Soriano
2018 Chaos  
For a RP obtained from a time series of N samples, with frequency distribution P(l) of diagonals line length, frequency distribution P(v) of vertical line length, probability p(l) of finding a diagonal  ...  Variables related to vertical lines. **** P<0.0001. investigations.  ... 
doi:10.1063/1.5024248 pmid:30180613 fatcat:n3bk2mhib5f6hk2gfhdfrflp6e

Classification System for Fetal Heart Rate Variability Measures Based on Cardiotocographies

João A. L. Marques, Paulo C. Cortez, João P. V. Madeiro, Fernando S. Schlindwein
2013 Journal of Life Sciences and Technologies  
P i .  ...  µ Pi + σ Pi < P i ≤ µ Pi + 2(σ Pi ) µ Pi -2(σ Pi ) ≤ P i < µ Pi -σ Pi  Abnormality: P i > µ Pi + 2(σ Pi ) P i < µ Pi -2(σ Pi ) where µ Pi is the mean and σ Pi is the standard deviation for each parameter  ...  P. C. Cortez was graduated in Electrical  ... 
doi:10.12720/jolst.1.3.184-189 fatcat:syp6aty2xfefbgumuvatcpokua

A Novel Surface Electrocardiogram-Based Marker of Ventricular Arrhythmia Risk in Patients With Ischemic Cardiomyopathy

W. B. Nicolson, G. P. McCann, P. D. Brown, A. J. Sandilands, P. J. Stafford, F. S. Schlindwein, N. J. Samani, G. A. Ng
2012 Journal of the American Heart Association : Cardiovascular and Cerebrovascular Disease  
R2I2 correlated with peri-infarct zone as assessed by cardiac magnetic resonance imaging (r=0.51, P=0.024).  ...  R2I2 was significantly higher in the Study patients than in Controls (mean ± standard error of the mean: 1.09±0.06 versus 0.63±0.04, P<0.001).  ...  There was also no correlation between R2I2 and TpTe (r=−0.004, P=0.978) or between R2I2 and QT dispersion (r=−0.207, P=0.096).  ... 
doi:10.1161/xjaha.111.001552 fatcat:wbkexjtqyfbxrpt3bmffyoz37y

055 Successful application of a novel restitution gradient based marker of ventricular arrhythmia to patients with non-ischaemic conditions: Abstract 055 Figure 1

M I Smith, M B Nicolson, P Brown, J Tuan, A J Sandilands, P J Stafford, F S Schlindwein, G P McCann, G A Ng
2012 Heart  
Results R2I2 was significantly higher in Cases compared to Controls (mean 6SEM: 0.98 60.04 vs 0.63 60.04, p<0.001) (scatter plot).  ... 
doi:10.1136/heartjnl-2012-301877b.55 fatcat:p2xhld3qtbgl3i5kl2oqof3jve

159 Pilot Study exploring the regional repolarisation instability index in relation to myocardial heterogeneity and prediction of ventricular arrhythmia and death

W. B. Nicolson, C. D. Steadman, P. Brown, M. Jeilan, S. Yusuf, S. Kundu, A. J. Sandilands, P. J. Stafford, F. S. Schlindwein, G. P. McCann, G. A. Ng
2011 Heart  
Abstract 159Table 1 Variable Whole Group (n[30) No VA/death (n[23) VA/death (n[7) p Age (years) 6769 6 5 69 7 2 68 0.055 Sex (% male) 97 96 100 QRSD(ms) 107620 107621 106615 0.95  ... 
doi:10.1136/heartjnl-2011-300198.159 fatcat:xhvxdliifvc63hwgru6fjsd5gq

Propagation of meandering rotors surrounded by areas of high dominant frequency in persistent atrial fibrillation

João Salinet, Fernando S. Schlindwein, Peter Stafford, Tiago P. Almeida, Xin Li, Frederique J. Vanheusden, María S. Guillem, G. André Ng
2017 Heart Rhythm  
.; Schlindwein, FS.; Stafford, P.; Almeida, TP.; Li, X.; Vanheusden, F.; Guillem Sánchez, MS.... (2017).  ...  Subdividing 184 it into two groups, PV areas and non-PV areas, the percentage of reduction was 185 respectively 78.6±22.2% (p<0.05) and 36.8±24.8% (p=0.05).  ...  P-values of less than 0.characteristics are summarized on Table 1.  ... 
doi:10.1016/j.hrthm.2017.04.031 pmid:28438722 fatcat:wm5egjckkjepxbkbgn4lgijlwe

Drifting rotor prevalence is associated with dominant frequency reduction after persistent atrial fibrillation ablation

Joao L Salinet, Maria S Guillem, Tiago P Almeida, Xin Li, Gustavo Goroso, Gavin S Chu, G Andre Ng, Fernando S Schlindwein
2015 2015 Computing in Cardiology Conference (CinC)  
p<0.05).  ...  After pulmonary vein isolation PS incidence reduced (90.8±59.8 vs. 23.8±31.6, p<0.05), concomitantly, DF decreased (DFmax from 7.3±0.4 Hz to 7.1±0.8 Hz, p=0.26 and DF min from 5.1±1.2 Hz to 4.2±1.1 Hz,  ...  DF max decreased from 7.3±0.4 Hz to 7.1±0.8 Hz (p=0.26) and DF min from 5.1±1.2 Hz to 4.2±1.1 Hz (p<0.05). DF grad (DF max -DF min ) had increased from 2.2±0.8 Hz to 3.0±1.2 Hz (p=0.1).  ... 
doi:10.1109/cic.2015.7408638 dblp:conf/cinc/SalinetGALGCNS15 fatcat:tqu4btfn7fdmnp6wem3vxan67e
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