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An objective pronator drift test application (iPronator) using handheld device.

Shin S, Park E, Lee DH, Lee KJ, Heo JH, Nam HS - PLoS ONE (2012)

Bottom Line: The degrees of average and maximum in pronation were greater in the patient group than in the control group [in average, 28.9°, interquartile range (IQR) 18.7-40.3 vs. 3.8° (IQR 0.3-7.5), p<0.001], in maximum, 33.0° (IQR 24.0-52.1) vs. 6.2° (IQR 1.4-9.4), p<0.001].In drift, the degrees of average, maximum, and oscillation were greater in the patient group.In stroke patients, a follow-up study at one week revealed improvements in the degrees of pronation and drift compared with baseline parameters.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurology, Yonsei University College of Medicine, Seodaemoon-gu, Seoul, Korea.

ABSTRACT

Background: The pronator drift test is widely used to detect mild arm weakness. We developed an application that runs on a handheld device to objectify the pronator drift test and investigated its feasibility in stroke patients.

Methods: The iPronator application, which uses the built-in accelerometer in handheld devices, was developed. We enrolled acute ischemic stroke patients (n = 10) with mild arm weakness and healthy controls (n = 10) to validate the iPronator. In addition to conventional neurological examinations, the degree of average, maximum, and oscillation in drift and pronation were measured and compared using the iPronator. Follow-up tests using the iPronator were also conducted in the patient group one week later.

Results: There was a strong correlation between the average degree of pronation and drift measured by the iPronator (r = 0.741, p<0.001). The degrees of average and maximum in pronation were greater in the patient group than in the control group [in average, 28.9°, interquartile range (IQR) 18.7-40.3 vs. 3.8° (IQR 0.3-7.5), p<0.001], in maximum, 33.0° (IQR 24.0-52.1) vs. 6.2° (IQR 1.4-9.4), p<0.001]. The degree of oscillation in pronation was not different between the groups (p = 0.166). In drift, the degrees of average, maximum, and oscillation were greater in the patient group. In stroke patients, a follow-up study at one week revealed improvements in the degrees of pronation and drift compared with baseline parameters.

Conclusions: The iPronator can reliably detect mild arm weakness of stroke patients and was also useful in detecting functional recovery for one week in patients with acute stroke.

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Related in: MedlinePlus

Improvements in the degree of pronation and drift during follow-up in the patient group.The degrees of average (A), maximum (B), and oscillation (C) of pronation were significantly improved from the baseline value. However, the degrees of average (D) and oscillation (F) in drift were significantly improved, the degree of maximum (E) drift was not different compared with baseline.
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pone-0041544-g004: Improvements in the degree of pronation and drift during follow-up in the patient group.The degrees of average (A), maximum (B), and oscillation (C) of pronation were significantly improved from the baseline value. However, the degrees of average (D) and oscillation (F) in drift were significantly improved, the degree of maximum (E) drift was not different compared with baseline.

Mentions: A follow-up study for the same patients was conducted one week later. Slight neurological improvements in the affected arm measured by NIHSS scores were detected [from 1 (IQR 1–1.25) to 1 (IQR 1–1), P = 0.048]. Follow-up tests using the iPronator demonstrated the improvements of quantitative data. Comparing with baseline parameters, both parameters for pronation and drift were improved. The degrees of average (P = 0.004), maximum (P = 0.002), and oscillation (P = 0.027) of pronation were improved significantly at follow-up (Figure 4A to C). The degrees of average (P = 0.004) and oscillation (P = 0.006) of drift also improved significantly. However, the degree of maximum drift (P = 0.106) was not different between baseline and follow-up (Figure 4D to F) (Table 4).


An objective pronator drift test application (iPronator) using handheld device.

Shin S, Park E, Lee DH, Lee KJ, Heo JH, Nam HS - PLoS ONE (2012)

Improvements in the degree of pronation and drift during follow-up in the patient group.The degrees of average (A), maximum (B), and oscillation (C) of pronation were significantly improved from the baseline value. However, the degrees of average (D) and oscillation (F) in drift were significantly improved, the degree of maximum (E) drift was not different compared with baseline.
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC3404034&req=5

pone-0041544-g004: Improvements in the degree of pronation and drift during follow-up in the patient group.The degrees of average (A), maximum (B), and oscillation (C) of pronation were significantly improved from the baseline value. However, the degrees of average (D) and oscillation (F) in drift were significantly improved, the degree of maximum (E) drift was not different compared with baseline.
Mentions: A follow-up study for the same patients was conducted one week later. Slight neurological improvements in the affected arm measured by NIHSS scores were detected [from 1 (IQR 1–1.25) to 1 (IQR 1–1), P = 0.048]. Follow-up tests using the iPronator demonstrated the improvements of quantitative data. Comparing with baseline parameters, both parameters for pronation and drift were improved. The degrees of average (P = 0.004), maximum (P = 0.002), and oscillation (P = 0.027) of pronation were improved significantly at follow-up (Figure 4A to C). The degrees of average (P = 0.004) and oscillation (P = 0.006) of drift also improved significantly. However, the degree of maximum drift (P = 0.106) was not different between baseline and follow-up (Figure 4D to F) (Table 4).

Bottom Line: The degrees of average and maximum in pronation were greater in the patient group than in the control group [in average, 28.9°, interquartile range (IQR) 18.7-40.3 vs. 3.8° (IQR 0.3-7.5), p<0.001], in maximum, 33.0° (IQR 24.0-52.1) vs. 6.2° (IQR 1.4-9.4), p<0.001].In drift, the degrees of average, maximum, and oscillation were greater in the patient group.In stroke patients, a follow-up study at one week revealed improvements in the degrees of pronation and drift compared with baseline parameters.

View Article: PubMed Central - PubMed

Affiliation: Department of Neurology, Yonsei University College of Medicine, Seodaemoon-gu, Seoul, Korea.

ABSTRACT

Background: The pronator drift test is widely used to detect mild arm weakness. We developed an application that runs on a handheld device to objectify the pronator drift test and investigated its feasibility in stroke patients.

Methods: The iPronator application, which uses the built-in accelerometer in handheld devices, was developed. We enrolled acute ischemic stroke patients (n = 10) with mild arm weakness and healthy controls (n = 10) to validate the iPronator. In addition to conventional neurological examinations, the degree of average, maximum, and oscillation in drift and pronation were measured and compared using the iPronator. Follow-up tests using the iPronator were also conducted in the patient group one week later.

Results: There was a strong correlation between the average degree of pronation and drift measured by the iPronator (r = 0.741, p<0.001). The degrees of average and maximum in pronation were greater in the patient group than in the control group [in average, 28.9°, interquartile range (IQR) 18.7-40.3 vs. 3.8° (IQR 0.3-7.5), p<0.001], in maximum, 33.0° (IQR 24.0-52.1) vs. 6.2° (IQR 1.4-9.4), p<0.001]. The degree of oscillation in pronation was not different between the groups (p = 0.166). In drift, the degrees of average, maximum, and oscillation were greater in the patient group. In stroke patients, a follow-up study at one week revealed improvements in the degrees of pronation and drift compared with baseline parameters.

Conclusions: The iPronator can reliably detect mild arm weakness of stroke patients and was also useful in detecting functional recovery for one week in patients with acute stroke.

Show MeSH
Related in: MedlinePlus