Hypothesis: ultrasonography can document dynamic rouleaux formation due to mobile phone exposure.

Abstract

Carrying a cellphone against the body has become commonplace in our world replete with smartphones. Acute and chronic health effects caused by these devices emitting radiofrequency radiation from multiple antennas have not been well evaluated. In this study, the popliteal vein of a healthy volunteer was imaged with ultrasonography prior to and following the placement of an idle, but active smartphone against her knee for 5 min. Pre-exposure longitudinal sonographic images demonstrate a normal anechoic lumen to the popliteal vein. Images obtained 5 min after direct skin exposure to the smartphone demonstrate a dramatic change in the acoustic appearance of the vessel. The interior of the vessel became coarsely hypoechoic with sluggish flow seen in real-time images, a typical sonographic appearance for rouleaux formation. A follow up examination performed 5 min after the subject walked around yielded continued rouleaux formation in the popliteal vein, albeit less dramatic than that observed immediately post exposure. This revolutionary method to assess radiofrequency radiation induced rouleaux formation should be further pursued in the general population to determine its prevalence and if its occurrence provides a unique biomarker of exposure that may predict morbidity.

AI evidence extraction

Main findings

In a single healthy volunteer, ultrasonography of the popliteal vein appeared normal pre-exposure. Five minutes after placing an idle but active smartphone against the knee for 5 minutes, the vein lumen appeared coarsely hypoechoic with sluggish flow, described as typical for rouleaux formation; a follow-up 5 minutes after walking still showed rouleaux formation but less dramatic.

Outcomes measured

• Ultrasonography appearance of popliteal vein lumen
• Sluggish venous flow on real-time imaging
• Rouleaux formation (sonographic appearance)

Limitations

• Single-subject observation (n=1)
• No frequency/SAR or detailed exposure characterization reported
• No sham/control condition described
• Short follow-up; persistence beyond minutes not assessed
• Outcome is an imaging interpretation (rouleaux inferred from sonographic appearance)

Suggested hubs

• mobile-phones-rf (0.9)
  Direct skin exposure to an active smartphone and reported vascular imaging changes.

{
    "study_type": "case_report",
    "exposure": {
        "band": "RF",
        "source": "mobile phone",
        "frequency_mhz": null,
        "sar_wkg": null,
        "duration": "5 min (direct skin exposure; imaging pre and 5 min post; follow-up 5 min after walking)"
    },
    "population": "Healthy volunteer (female implied)",
    "sample_size": 1,
    "outcomes": [
        "Ultrasonography appearance of popliteal vein lumen",
        "Sluggish venous flow on real-time imaging",
        "Rouleaux formation (sonographic appearance)"
    ],
    "main_findings": "In a single healthy volunteer, ultrasonography of the popliteal vein appeared normal pre-exposure. Five minutes after placing an idle but active smartphone against the knee for 5 minutes, the vein lumen appeared coarsely hypoechoic with sluggish flow, described as typical for rouleaux formation; a follow-up 5 minutes after walking still showed rouleaux formation but less dramatic.",
    "effect_direction": "harm",
    "limitations": [
        "Single-subject observation (n=1)",
        "No frequency/SAR or detailed exposure characterization reported",
        "No sham/control condition described",
        "Short follow-up; persistence beyond minutes not assessed",
        "Outcome is an imaging interpretation (rouleaux inferred from sonographic appearance)"
    ],
    "evidence_strength": "very_low",
    "confidence": 0.66000000000000003108624468950438313186168670654296875,
    "peer_reviewed_likely": "yes",
    "keywords": [
        "smartphone",
        "mobile phone",
        "radiofrequency radiation",
        "ultrasonography",
        "popliteal vein",
        "rouleaux formation",
        "venous flow"
    ],
    "suggested_hubs": [
        {
            "slug": "mobile-phones-rf",
            "weight": 0.90000000000000002220446049250313080847263336181640625,
            "reason": "Direct skin exposure to an active smartphone and reported vascular imaging changes."
        }
    ]
}

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