Efficacy and economic benefits of a modified Valsalva maneuver in patients with paroxysmal supraventricular tachycardia

Table 1 Baseline characteristics of the patients included in each group

Group	Modified VM	Standard VM	χ2/t	P value
Patients (n)	180	181
Men [n (%)]	84 (46.7)	74 (40.88)	1.226	0.290
Age (yr)	51.76 ± 12.02	49.29 ± 13.59	1.823	0.069
Weight (kg)	64.89 ± 20.82	68.22 ± 13.27	-1.815	0.070
Duration of PSVT (yr)	7.27 ± 7.38	8.60 ± 8.10	-1.630	0.104
Systolic BP (mmHg)	127.42 ± 28.67	132.35 ± 19.46	-1.913	0.057
Diastolic BP (mmHg)	79.61 ± 18.17	82.77 ± 12.81	-1.912	0.057
Pulse (bpm)	75.71 ± 18.26	79.18 ± 15.22	-1.962	0.051
Serum potassium (mmol/L)	3.94 ± 0.89	4.08 ± 0.51	-1.826	0.069
Coronary heart disease [n (%)]	2 (1.11)	8 (4.42)	3.668	0.105
Hypertension [n (%)]	36 (2.00)	44 (24.31)	0.972	0.375
Diabetes [n (%)]	10 (5.56)	10 (5.52)	0.000	1.000
Pneumonia [n (%)]	2 (1.11)	0 (0.00)	2.022	0.155

PSVT: Paroxysmal supraventricular tachycardia; VM: Valsalva maneuver.

Table 2 Comparison of success rate of paroxysmal supraventricular tachycardia conversion between the two groups (data are presented as number and percentage)

Group	n	Sinus rhythmafter multiple VM	Sinus rhythm after single VM
Modified VM	180	112 (62.22)	86 (47.78)
Standard VM	181	36 (19.89)	28 (15.47)
χ2 value		66.860	43.599
P value		< 0.001	< 0.001

VM: Valsalva maneuver.

Table 3 Comparison of the incidence of adverse events in both groups (data are presented as number and percentage)

Group	n	Chest tightness	Dizziness	Chest pain
Modified VM	180	10 (5.56)	6 (3.33)	4 (2.22)
Standard VM	181	8 (4.40)	4 (2.20)	2 (1.10)
χ2 value		0.246	0.423	0.689
P value		0.639	0.542	0.449

VM: Valsalva maneuver.

Table 4 Comparison of the cost-effective in both groups (data are presented as mean ± SD)

Group	n	Cost-effective (mean ± SD, yuan)
Modified VM	180	113.32 ± 45.22
Standard VM	181	140.91 ± 37.08
t value		-6.346
P value		0

VM: Valsalva maneuver.

Table 5 Comparison of the degree of patient acceptance in both groups

Group	n	Degree of acceptance (mean ± SD)	< 3 (%)	3’ (%)	> 3’ (%)
Modified VM	180	3.67 ± 0.69	6 (3.33)	58 (32.22)	116 (64.44)
Standard VM	181	3.54 ± 0.66	8 (4.42)	76 (41.99)	97 (53.59)
t/χ2 value		1.855	2.286	3.688	4.495
P value		0.064	0.786	0.064	0.042

VM: Valsalva maneuver.