SfaturiMedicale.ro - Bolile sistemului de conducere

Bolile sistemului de conducere

Ritmul inimii este controlat de impulsuri electrice generate de către nodul sinusal, situat la nivelul atriului drept. Aceste celule pace-maker produc impulsuri electrice care traversează ambele atrii, determinând contracţia pereţilor musculari ai acestora. Impulsurile electrice circulă de la nivelul atriilor către ventriculi printr-un mănunchi mic de ţesut specializat denumit nodul atrioventricular, către o bandă de fibre specializate (fasciculul His) care conduce impulsurile către fibrele musculare ale ventriculilor. Aceste fibre musculare stimulate se vor contracta.

Semne şi simptome
•Adeseori nu există semne şi simptome
•Dispnee sau senzaţie de epuizare

Semne şi simptome de urgenţă
•Dispnee extremă şi slăbiciune
•Pierderea cunoştinţei, convulsii

În boala sistemului de conducere (blocul cardiac) impulsul electric traversează nodul atrioventricular şi fasciculul His încet, intermitent sau deloc.
Această situaţie poate fi cauzată de mai mulţi factori:
•existenţa unor cicatrice în calea fibrelor specializate în conducere;
•boala arterelor coronare (inclusiv infarctul);
•boală cardiacă congenitală;
•anumite medicamente (inclusiv digitala, beta-blocantele şi blo-canţii canalelor de calciu);
•infecţiile, cum sunt boala Lyme şi mononucleoza.

Acest articol a fost citit de 565 ori.

Comenteaza articolul

Nume:
Titlu:
Comentariu:
Cod:*

Comentarii (2)

	1. Scris de Tonya in 17-05-2012 04:49
	AFaachBW You did not say which gas you have available:Natural gas (NG) is about half the rnnniug cost of an electric water heater. Propane is only slightly less than an electric. (generally speaking all being traditional storage water heaters).If the water heater is more than 10 years old, I'd push for having it replaced in part so you can take advantage of the new energy tax credit.It's best if the seller replaces it and you negotiate how to share the expense. Make the seller aware that there are federal tax credits available for energy efficient water heaters including installation cost. There may also be incentives from your local government and utility companies. If the seller reduces his cost, there will be less to share and you both win.Look for ENERGY STAR qualified products for lower operating cost.To replace with another gas unit, I'd look into the new condensing technologies, either tankless (same as on-demand or instantaneous) or conventional storage. They are extraordinarily energy efficient.The only electric water heater that will save you money in operating cost over an NG water heater is a heat pump water heater. They are not for everyone, and they are just starting to come on the market for residential use. Note that any gas water heater (storage or tankless) is more cost effective than electric storage or tankless.The notion that all tankless are more efficient than any storage water heater is a myth. For instance, condensing gas storage water heaters are more efficient than many tankless water heaters. An electric tankless water heater is only 10-15% more energy efficient than an electric storage water heater. The difference is quickly spent in installation cost. An (electric) heat pump water heater is more efficient than many tankless gas water heaters.If you are concerned about your carbon footprint do not go with electric. It is estimated that the CO2 emissions from generating the power for the electric unit is at least double that from a conventional gas water heater. The exception is the heat pump water heater it only uses the power to cycle a fluid, not for the actual heating. Your best option for low CO2 is solar no surprise.

	2. Scris de hmbjwvedym in 17-05-2012 07:31
	HrYWkUGgdsiIaaE K9GmVg qkrnqazfoepz

[ Inapoi ]

Lentile de contact