Untreated heart attacks may slow blood flow enough that blood may start to clot and prevent the flow of blood to the brain or other major organs. Extremely low blood pressure can also result from drug overdose and reactions to drugs. Therefore, brain ischemia can result from events other than heart attacks.
What Is Return Receipt? The USPSÂ® offers a service called Return Receipt that gives you peace of mind by providing evidence of delivery in the form of a postcard signed by the recipient or an e-mail with an electronic copy of the recipientâs signature. Return Receipt is available for Priority Mail ExpressÂ®, Priority MailÂ®, First Class MailÂ®, Retail GroundÂ® and Media Mail.
A prepaid return label for a USPS shipment is valid until there is a price change that results in the postage paid being the wrong amount. If a price change occurs before the label is used, the shipment could be delivered with postage due or returned to the sender for more postage. Since USPS is known to recycle tracking numbers, we recommend using a USPS prepaid return shipping label within 90 days.