Table 1.
Demographic and clinical characteristics of included patients from chart review
| Parameter | Overall (N = 11) |
|---|---|
| Age (years), mean (SD) | 46.00 (17.98) |
| Female, n (%) | 9 (81.8) |
| Hypertension, n (%) | 3 (27.3) |
| Hyperlipidemia, n (%) | 2 (18.2) |
| Days to symptoms, mean (SD) | 39.45 (57.30) |
| Palpitations, n (%) | 9 (81.8) |
| Chest discomfort, n (%) | 7 (63.6) |
| Dyspnea, n (%) | 8 (72.7) |
| Fatigue, n (%) | 9 (81.8) |
| Dizziness, n (%) | 3 (27.3) |
| Symptoms worse when: | |
| Standing | 1 (9.1) |
| Sitting | 1 (9.1) |
| Same | 4 (36.4) |
| N/A | 5 (45.5) |
| Days to first cardiology clinic visit, mean (SD) | 171.45 (119.02) |
| Left ventricular ejection fraction (%), mean (SD) | 57.50 (4.51) |
| White blood cell count (per μL), mean (SD) | 7546.25 (2362.41) |
| Hemoglobin (g/dL), mean (SD) | 14.12 (1.10) |
| Thyroid stimulating hormone (mIU/L), mean (SD) | 2.40 (1.97) |
| Erythrocyte sedimentation rate (mm/h), mean (SD) | 17.00 (2.83) |
| C-reactive protein (mg/L), mean (SD) | 0.85 (0.35) |
| Troponin, n (%): | |
| Normal | 7 (63.6) |
| N/A | 4 (36.4) |
| Brain natriuretic peptide, n (%): | |
| Normal | 8 (72.7) |
| N/A | 3 (27.3) |
| Pulmonary embolism formally ruled out, n (%) | 7 (63.6) |
| Ambulatory heart rate monitoring, n (%) | 8 (72.7) |
| Ambulatory monitor duration, n (%): | |
| <7 days | 4 (36.4) |
| 7–10 days | 2 (18.2) |
| >10 days | 2 (18.2) |
| N/A | 3 (27.3) |
| Average heart rate (bpm), mean (SD) | 86.25 (11.45) |
| Minimum heart rate (bpm), mean (SD) | 51.38 (5.34) |
| Maximum heart rate (bpm), mean (SD) | 154.25 (25.05) |
| Orthostatic vitals, n (%): | |
| Positive | 1 (9.1) |
| Negative | 4 (36.4) |
| Not checked | 6 (54.5) |
| Tilt table test performed, n (%) | 2 (18.2) |
| Diagnosis, n (%): | |
| Inappropriate sinus tachycardia | 2 (18.2) |
| Postural orthostatic tachycardia syndrome | 2 (18.2) |
| Other | 7 (63.6) |
bpm = beats per minute; N/A = not available.