Table 1.
Overview of participating patients with chronic heart disease and an implantable cardioverter-defibrillator (n=27).
| Patient number | Age (years) | Sex | Year of ICDa
implant |
Symptoms experienced | Number of weeks using the Fitbit (not using) | Experienced Fitbit data relating to heart disease |
| P1 | 67 | Male | 1998 | No symptom experiences; experienced palpitations before | 18 (0) | No |
| P2 | 61 | Male | 2015 | Severe chest pain and shortness of breath | 47.5 (0.5) | Yes |
| P3 | 41 | Male | 2009 | No symptom experiences; experienced shortness of breath before | 41 (6) | No |
| P4 | 55 | Male | 2014 | Dizziness and sometimes fainting | 13 (5) | Yes |
| P5 | 66 | Male | 2010 | Dizziness and sometimes fainting | 8 (23) | Yes |
| P6 | 67 | Male | 2015 | No symptom experiences | 9.5 (1.5) | N/Ab |
| P7 | 28 | Male | 2008 | No symptom experiences | 6 (3) | N/A |
| P8 | 69 | Male | 2015 | No symptom experiences (primary prophylaxis) | 36.5 (11) | Yes |
| P9 | 47 | Male | 2008 | No symptoms experiences related to his heart disease; lung disease; difficulties exercising | 33,5 (14.5) | Yes |
| P10 | 61 | Male | 2010 | Sometimes feeling very tired | 30 (8) | Yes |
| P11 | 59 | Male | 2006 | Shortness of breath and sometimes sleep problems; finds it difficult to feel his heart rate | 8.5 (0.5) | Yes |
| P12 | 66 | Male | 2015 | Dizziness and sometimes fainting; anxious about getting a shock and experiences depression | 49 (0) | Yes |
| P13 | 67 | Male | 2017 | No symptom experiences; rarely experience fainting; leg tenderness and muscle fatigue | 44.5 (0.5) | Yes |
| P14 | 52 | Female | 2008 | No symptom experiences | 49 (0) | No |
| P15 | 61 | Female | 2004 | No symptom experiences; sometimes being anxious about the ICD/irregular heartbeats | 14 (1) | Yes |
| P16 | 47 | Male | 2014 | Dizziness and sometimes fainting | 35.5 (11.5) | No |
| P17 | 45 | Male | 2013 | Dizziness and shortness of breath during high activity levels | 35 (7) | Yes |
| P18 | 67 | Male | 2009 | No symptom experiences | 18 (29) | Yes |
| P19 | 66 | Male | 2005 | Palpitations daily; experiences periods of depression and has restless leg syndrome | 20.5 (1.5) | No |
| P20 | 69 | Male | 2014 | No symptom experiences, except sometimes shortness of breath | 39.5 (8.5) | Yes |
| P21 | 38 | Male | 2008 | No symptom experiences; worries daily about having a cardiac arrest again | 13.5 (0) | Yes |
| P22 | 59 | Male | 2001 | Shortness of breath and sometimes dizziness when exercising and running; rapid heartbeats and chest pain | 19.5 (0.5) | Yes |
| P23 | 49 | Male | 2017 | No symptom experiences | 47 (2) | Yes |
| P24 | 74 | Male | 2017 | No symptom experiences | 42.5 (6) | Yes |
| P25 | 51 | Male | 2014 | No symptom experiences | 9 (15) | No |
| P26 | 56 | Male | 2010 | No symptom experiences; sometimes feels palpitations and shortness of breath | 4 (0) | No |
| P27 | 58 | Male | 2014 | Shortness of breath; sometimes sleep problems; knee-pain due to osteoarthritis | 12 (5) | Yes |
aICD: implantable cardioverter-defibrillator.
bN/A: not available because the patient did not describe a relation between the activity data and his or her heart disease.