2015 ACVIM Forum Research Abstract Program

Seventeen normal cats and six cats with HCM were examined with this recorder, together with standard ECG limb lead II (StECG) and echocardiography. ECG was recorded with the iPhone on the left side of thorax over the cardiac region. The (iPECG) was recorded on the left side of thorax with the telephone parallel to the long axis of the heart. The heart was located by auscultation and the middle of the telephone placed over the point of maximal heart sounds. This to ensure that the electrodes were placed one cranial to the heart base and one distal to the heart apex. All ECGs recorded in the iPhone (iPECG) were stored and read blindly later after magnification on the screen of the iPhone. Cats with QRS duration >0.04 sec on both iPECG and StECG were categorized as abnormal. Comparison of iPECG and StECG revealed that only 2 of 17 of the normal cats had QRS duration >0.04s on ECG, producing two false positives using iPECG. On iPECG 8 of 23 cats had QRS duration >0.04s, including all 6 cats positive for HCM on echocardiography (sensitivity = 1.0, specificity = 0.83, j = 0.8). StECG lead II with cut off QRS duration of 0.04s to detect HCM produced 1 false negative and 1 false positive (sensitivity = 0.83, specificity = 0.94, j = 0.77). A statistically significant difference (P < 0.05) was found for QRS duration and amplitude between normal cats and cats with HCM using iPECG. iPECG was easy and rapid to record compared to StECG. Despite the limited number of HCM cats the result of this pilot study suggest that screening for HCM and selection of cases to refer for echocardiography could be accomplished with iPhone ECG. Further studies with expanded number of cases are warranted. . Chordal trunks originating from PMs (range, 1-13 trunks/PM) arborized into marginal or ventricular chordae tendineae (CT) subservient to one or more leaflets. Number of chordal trunks from mural PMs (3.5;1-13) were greater than from septal PMs (1, 1-9) (P < 0.001). Thirty-sixty percent of septal leaflet CT trunks originated directly from ventricular septum, whereas all mural leaflet CT trunks originated from PMs.