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9,603 results for

Pain Sensation

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9601. Inward currents in primary nociceptive neurons of the rat and pain sensations in humans elicited by infrared diode laser pulses. (PubMed)

Inward currents in primary nociceptive neurons of the rat and pain sensations in humans elicited by infrared diode laser pulses. Radiant heat is often used to study nociception in vivo. We now used infrared radiation generated by a diode laser stimulator (wavelength 980 nm) to investigate transduction mechanisms for noxious heat stimuli in acutely dissociated dorsal root ganglion (DRG) neurons of rats in vitro. The laser stimulator offered the unique opportunity to test whether the same stimuli (...) also elicit pain sensations in humans. A specific heat-induced current (I(heat)) was elicited in six of 13 small DRG neurons (diameter < or =30 microm) tested in the whole-cell configuration of the patch-clamp mode. Current responses in the seven heat-insensitive neurons were within the range explainable by the temperature dependence of the recording setup. I(heat) was characterized by: (1) non-linearity of its amplitude during a suprathreshold heat ramp as well as with stimuli of increasing

2002 Pain

9602. Increasing pain sensation to repeated esophageal balloon distension in patients with chest pain of undetermined etiology. (PubMed)

Increasing pain sensation to repeated esophageal balloon distension in patients with chest pain of undetermined etiology. Previous studies have demonstrated lowered sensory thresholds to esophageal balloon distension in patients with chest pain of undetermined etiology. Whether this finding is specific to patients with chest pain or is simply related to an underlying esophageal motility disorder is unclear. In the present study, distension-induced pain-sensation scores and the effect (...) of repeated balloon distension were compared in patients with chest pain, dysphagia secondary to esophageal dysmotility, and healthy controls. All subjects underwent standard esophageal manometry followed by mid-esophageal balloon distension. Volumes 2.5, 5, 7.5, and 10 ml (each volume repeated three times) were applied in random order in a single-blind fashion, and the pain-sensation score was recorded after each distension. Pain-sensation scores varied directly with balloon volume. Mean pain scores were

1995 Digestive diseases and sciences

9603. [The correspondence between pain stimulus and pain sensation.]. (PubMed)

[The correspondence between pain stimulus and pain sensation.]. The relationship between painful pressure stimuli and induced pain intensity was examined. For experimental pain stimulation in 26 subjects, randomized local pressure on the middle phalanxes of fingers II-IV was used (pressure area 2.56 mm(2), six different pressure levels, three different pressure times). The induced pain intensity was measured by the category splitting procedure. Our results demonstrate that the pain intensity (...) is proportional to the logarithm of the pressure stimulus. This finding is predicted by Fechner's law. The intraindividual and interindividual deviations are normally distributed. The retest reliability between measurements in the morning and in the evening amount to 0.98. Thus, the procedure can be used to objectify the pain intensity experienced.

1988 Schmerz (Berlin, Germany)

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