The accuracy of SpaceLabs 90207 in blood pressure monitoring in patients with atrial fibrillation

Figures & data

Table 1. Frequency of occurrence of concomitant diseases in the investigated population.

Diagnosis	Percentage of the studiedgroup [%]
Arterial hypertension	76
Coronary artery disease	59
Heart failure	48
Diabetes mellitus t. 2	35
Post-operative atrial fibrillation	29
Dyslipidaemia	23
Hyperthyroidism in patient history	20
Chronic kidney disease	2
Previous transient ischemic attack	2

Table 2. Blood pressure and heart rate values as measured by compared methods.

	During atrial fibrillation (n = 47)			After restoring sinus rhythm (n = 29)
	Mercury sphygmomanometer	SpaceLabs 90207	P-value	Mercury sphygmomanometer	SpaceLabs 90207	P-value
SBP [mm Hg]	123.8 ± 16.1	125.6 ± 14.6	0.09	125.3 ± 23.0	126.1 ± 19.9	0.51
DBP [mm Hg]	77.8 ± 9.5	82.4 ± 10.9	<0.001	72.5 ± 8.3	74.6 ± 10.3	<0.01
HR [bpm]	82.9 ± 17.7*	79.5 ± 15.9	0.04	62.9 ± 9.9*	62.5 ± 9.9	0.27

n - number of participants; p-value for the comparison of differences vs. zero; SBP: systolic BP; DBP: diastolic BP; HR: heart rate; the asterisk (*) denotes values obtained using digital electrocardiographic signal monitoring.

Figure 1. Bland-Altman analysis of systolic and diastolic BP values recorded with SpaceLabs 90207 (SPL 90207) and mercury sphygmomanometer (MS), both during AFib and after restoration of sinus rhythm. Continuous line represents mean value of differences, while dotted lines show ±1SD. On X-axis the average value of BP measured simultaneously by SpaceLabs 90207 and mercury sphygmomanometer is presented.

Table 3. Average differences, standard deviations as well as percentage differences of 5, 10 and 15 mm Hg, between the systolic (SBP) and diastolic (DBP) BP values recorded with SpaceLabs 90207 device (SPL 90207) and mercury sphygmomanometer (MS). Data obtained both, during AFib and after restoring sinus rhythm.

	AAMI protocol		ESH-IP protocol
Criterion [Threshold value]	Average difference [5 mm Hg]	Standard deviation [8 mm Hg]	5 mm Hg [65%]	10 mm Hg [81%]	15 mm Hg [93%]
Atrial fibrillation
Δ SBP [mm Hg]	1.76	6.86	60	91	96
Δ DPB [mm Hg]	4.59	6.01	72	96	98
Sinus rhythm
Δ SBP [mm Hg]	0.78	6.34	72	93	97
Δ DPB [mm Hg]	2.1	4.0	83	97	100