{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T18:15:41Z","timestamp":1777400141878,"version":"3.51.4"},"reference-count":27,"publisher":"SAGE Publications","issue":"4","license":[{"start":{"date-parts":[[2002,7,1]],"date-time":"2002-07-01T00:00:00Z","timestamp":1025481600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Angiology"],"published-print":{"date-parts":[[2002,7]]},"abstract":"<jats:p>The previous studies relating to the effect of the Valsalva maneuver on P wave do not provide detailed information. In those studies, the parameters related to P wave duration during the release phase of the Valsalva maneuver were evaluated. The authors evaluated P wave amplitude as well as P wave duration during the strain phase of the Valsalva maneuver. Thirty- seven normal subjects and 36 patients with paroxysmal atrial fibrillation (PAF) were included in the study. Twelve-lead surface electrocardiography (ECG) was obtained from all the patients before and during the strain phase of the Valsalva maneuver. The authors evaluated the para meters related to both P wave duration and P wave amplitude. The highest P wave voltage was expressed as the P wave amplitude maximum (P amp max), the lowest P wave voltage as the P wave amplitude minimum (P amp min), and the P wave amplitude dispersion (P amp dispersion) as \"the P amp max \u2014 the P amp min.\" Also, the maximum P wave duration was expressed as the P maximum (P max), the minimum P wave duration as the P minimum (P min), and the P wave dispersion as \"the maximum P wave duration (P max) \u2014 the minimum P wave duration (P min).\" All these parameters were measured before and during the strain phase of the Valsalva maneuver. P max, P dispersion, P amp max, and P amp dispersion were higher in patients with PAF compared to those of normal subjects before the Valsalva maneuver. In normal subjects, P max, P wave dispersion, P amp max, and P amp dispersion values were significantly higher in the strain phase of the Valsalva maneuver than before (p&lt;0.01, p &lt; 0.0 1, p&lt;0.05, and p&lt;0.05, respectively). In the patients with PAF, P max, P wave dispersion, P amp max, and P amp dispersion values were significantly lower during the strain phase of the Valsalva maneuver than before. In conclusion, in the patients with PAF, P wave parameters were decreased during the strain phase of the Valsalva maneuver, approaching to the normal levels.<\/jats:p>","DOI":"10.1177\/000331970205300411","type":"journal-article","created":{"date-parts":[[2008,7,28]],"date-time":"2008-07-28T17:57:07Z","timestamp":1217267827000},"page":"443-449","source":"Crossref","is-referenced-by-count":8,"title":["The Effect of Valsalva Maneuver on P Wave in 12-Lead Surface Electrocardiography in Patients with Paroxysmal Atrial Fibrillation"],"prefix":"10.1177","volume":"53","author":[{"given":"B\u00fclent B.","family":"Altunkeser","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kurtulu\u015f","family":"\u00d6zdemir","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hasan","family":"G\u00f6k","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mehmet","family":"Yazici","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Abdullah","family":"I\u00e7li","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2002,7,1]]},"reference":[{"key":"atypb1","doi-asserted-by":"publisher","DOI":"10.1016\/S0735-1097(10)80106-8"},{"key":"atypb2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1540-8159.1993.tb00996.x"},{"key":"atypb3","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.94.3.384"},{"key":"atypb4","doi-asserted-by":"publisher","DOI":"10.1536\/ihj.29.57"},{"key":"atypb5","doi-asserted-by":"publisher","DOI":"10.1136\/hrt.25.5.570"},{"key":"atypb6","doi-asserted-by":"publisher","DOI":"10.1111\/j.1540-8159.1992.tb03025.x"},{"key":"atypb7","doi-asserted-by":"publisher","DOI":"10.1161\/01.CIR.88.6.2618"},{"key":"atypb8","doi-asserted-by":"publisher","DOI":"10.1016\/0735-1097(95)80028-F"},{"key":"atypb9","doi-asserted-by":"publisher","DOI":"10.1016\/S0002-9149(99)00891-7"},{"key":"atypb10","unstructured":"Waxman MB, Cameron AD, Wald RW: Interactions between the autonomic nervous system and supraventricular tachycardia in humans. 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